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Front spoiler for 70 Duster drag car (130mph) #1596305 03/21/14 08:12 PM 03/21/14 08:12 PM
Joined: Aug 2003 Posts: 136 Dallas, TX 4 440Brian OP member
440Brian OP member 4 Joined: Aug 2003 Posts: 136 Dallas, TX	I'm looking for more front end stability at the top end (130mph). Based on what I've read, I think I should try a front spoiler. I contacted Spoilers by Randy, but he doesn't think it will hold up at that speed. Has anyone tried that one at this speed? Is there a stronger pre-made one out there or does everybody build their own? 8083083-DSC00006(1)(640x422).jpg (467 downloads)

Re: Front spoiler for 70 Duster drag car (130mph) [Re: 440Brian] #1596306 03/21/14 08:30 PM 03/21/14 08:30 PM
Joined: Sep 2012 Posts: 1,563 Janesville, WI SpareParts pro stock
SpareParts pro stock Joined: Sep 2012 Posts: 1,563 Janesville, WI	Have you tried looking other places in the front end to gain stability? Not to destroy your thread but I don't think 130 should be too loose and require a spoiler. I think maybe there is a bigger hidden issue here. My stock front end is fine at those kind of speeds.

Re: Front spoiler for 70 Duster drag car (130mph) [Re: 440Brian] #1596307 03/21/14 08:45 PM 03/21/14 08:45 PM
Joined: Dec 2007 Posts: 310 Michigan 4 412 SB Duster enthusiast
412 SB Duster enthusiast 4 Joined: Dec 2007 Posts: 310 Michigan	May want to look at your alignment, I've been 137 with no issues with stock setup. And Know a lot of others that have been faster.

Re: Front spoiler for 70 Duster drag car (130mph) [Re: 440Brian] #1596308 03/21/14 08:46 PM 03/21/14 08:46 PM
Joined: Jan 2003 Posts: 5,894 Florida Locomotion master
Locomotion master Joined: Jan 2003 Posts: 5,894 Florida	Do you have clearance to lower the front any? Proper front end alignment can also affect/help top end stability. Something integrated into the bumper, straight down with a small lip facing out would help, but would involve a lot of fabricating and take away from the classic Duster look. I built a simple, angled and reinforced aluminum plate front spoiler on my old street challenger. But that was before I ever went to the drag strip or went that fast. It can get complicated and if it forces too much air under the hood, you could have problems keeping it on.

Re: Front spoiler for 70 Duster drag car (130mph) [Re: Locomotion] #1596309 03/21/14 09:51 PM 03/21/14 09:51 PM
Joined: Feb 2005 Posts: 20,145 PA. pittsburghracer "Little"John
pittsburghracer "Little"John Joined: Feb 2005 Posts: 20,145 PA.	Check the play in the steering box Check the welds on the steering box check toe in with a floor jack for improper changes. check for play in front suspension parts Make sure front and rear tires are proper for each other. If the front is to high try lowering but if you do so with the torsion bars check alignment again. 35 plus pounds in front tires. 1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27 Livin and lovin life one day at a time

Re: Front spoiler for 70 Duster drag car (130mph) [Re: 440Brian] #1596310 03/21/14 10:01 PM 03/21/14 10:01 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: I'm looking for more front end stability at the top end (130mph). Based on what I've read, I think I should try a front spoiler. I contacted Spoilers by Randy, but he doesn't think it will hold up at that speed. Has anyone tried that one at this speed? Is there a stronger pre-made one out there or does everybody build their own? It looks like you could lower the front 2"(re-align after but use racing specs)

Re: Front spoiler for 70 Duster drag car (130mph) [Re: MR_P_BODY] #1596311 03/22/14 01:31 AM 03/22/14 01:31 AM
Joined: Feb 2003 Posts: 1,238 Nevada D dezduster pro stock
dezduster pro stock D Joined: Feb 2003 Posts: 1,238 Nevada	That hood catches a lot of air that is pushed into the engine bay and that ads to air under the car also.

Re: Front spoiler for 70 Duster drag car (130mph) [Re: dezduster] #1596312 03/22/14 01:39 AM 03/22/14 01:39 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: That hood catches a lot of air that is pushed into the engine bay and that ads to air under the car also. That scoop doesnt catch that much but the grill opening sure does.. for racing you can close the whole grill off... it should pick up ET and MPH

Re: Front spoiler for 70 Duster drag car (130mph) [Re: MR_P_BODY] #1596313 03/22/14 03:03 AM 03/22/14 03:03 AM
Joined: Dec 2006 Posts: 4,647 aotearoa rebel master
rebel master Joined: Dec 2006 Posts: 4,647 aotearoa	Quote: That scoop doesnt catch that much but the grill opening sure does.. for racing you can close the whole grill off... it should pick up ET and MPH i agree. when i fitted my cowl & blocked off my grill i picked up both et & mph with no engine work. but back to the subject, i fitted this front spoiler which definately helped pull the front down at speed, so much so that the rear was becoming twitchy at the top end. i had to fit a rear wing to control that & now my car pushes down hard & is real stable even on a slipery track. 8083707-555899_472773859456309_1654093299_n.jpg (470 downloads)

Re: Front spoiler for 70 Duster drag car (130mph) [Re: rebel] #1596314 03/22/14 08:07 AM 03/22/14 08:07 AM
Joined: Jan 2003 Posts: 2,915 A shed in England Tig master
Tig master Joined: Jan 2003 Posts: 2,915 A shed in England	Apologies to OP about the thread hi-jack. Rebel, closing the grill off, how did that effect engine temps? '74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials. 9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge. RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03

Re: Front spoiler for 70 Duster drag car (130mph) [Re: 440Brian] #1596315 03/22/14 09:25 AM 03/22/14 09:25 AM
Joined: May 2004 Posts: 12,383 Taxes & Virus's R-US, NY Dragula I Live Here
Dragula I Live Here Joined: May 2004 Posts: 12,383 Taxes & Virus's R-US, NY	Quote: I'm looking for more front end stability at the top end (130mph). Based on what I've read, I think I should try a front spoiler. I contacted Spoilers by Randy, but he doesn't think it will hold up at that speed. Has anyone tried that one at this speed? Is there a stronger pre-made one out there or does everybody build their own? We started having trouble with ours over +125...Found some issues with the front steering and tie rods...Actually had a weld 85% torn on one side that holds one of the pivot arms on...Then found the bolt that holds the linkage to the pivot was the wrong diameter and replace a couple of worn out ball cups...Now +135 and its not to bad..I would be looking at anything that allows too much movement in the linkage and the items the linkage is bolted too... '70 Cuda,...605 EFI Hemi Street Car (6.20 best pass, 1.33 60ft) https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph from inside car) https://www.youtube.com/watch?v=3zQEb9uxFng (6.25 at 108mph from outside car) https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9) '66 Barracuda AWB Stretched nose Blown 440 Car in build stage '71 Duster Drag Car 400 Low Deck 512 best 6.002 at 115.44mph https://www.youtube.com/watch?v=Znuo3jMUXTk

Re: Front spoiler for 70 Duster drag car (130mph) [Re: Dragula] #1596316 03/22/14 09:35 AM 03/22/14 09:35 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	If ALL of the front end parts are right and tight I might think about the rear of the car... the front doesnt tend to lift(areo wise) with a heavy engine sitting in front at those speeds... what some guys think is the front moving can be the back.. if you get the front end shudder its loose or bad parts EDIT If the car starts to dart back and forth its normally a toe OUT issue at some point in the travel Last edited by MR_P_BODY; 03/22/14 09:37 AM.

Re: Front spoiler for 70 Duster drag car (130mph) [Re: 440Brian] #1596317 03/22/14 10:09 AM 03/22/14 10:09 AM
Joined: Jan 2003 Posts: 32,394 Q Quicktree I Win
Quicktree I Win Q Joined: Jan 2003 Posts: 32,394	yea the thing is setting way high in the front, do you have a full view pic? Like Locomotion said lower the front and possibly the whole car some.

Re: Front spoiler for 70 Duster drag car (130mph) [Re: MR_P_BODY] #1596318 03/22/14 02:03 PM 03/22/14 02:03 PM
Joined: Sep 2012 Posts: 1,563 Janesville, WI SpareParts pro stock
SpareParts pro stock Joined: Sep 2012 Posts: 1,563 Janesville, WI	What's the rear tire pressure? That can make the car loose if it's too low, it can give the feel that the front end is loose

Re: Front spoiler for 70 Duster drag car (130mph) [Re: SpareParts] #1596319 03/22/14 02:38 PM 03/22/14 02:38 PM
Joined: Apr 2007 Posts: 2,026 Trumbull,CT. J jim sciortino top fuel
jim sciortino top fuel J Joined: Apr 2007 Posts: 2,026 Trumbull,CT.	Your car appears to sit a little high in the pic you posted..... We had a 69' Barracuda in the early 90s with a 68' SS/AH scoop, all brand new stock front suspension pieces and steering box, with a set of Koni shocks and that car was pretty stable at 155.80 without any body modifications, spoilers, grille blocks, etc..... Try lowering front, then check the alignment and all front end/steering components. I wouldn't think there'd be an issue at in the 130 range, but if there's a component problem somewhere, you'll feel it.

Re: Front spoiler for 70 Duster drag car (130mph) [Re: jim sciortino] #1596320 03/22/14 03:14 PM 03/22/14 03:14 PM
Joined: Feb 2005 Posts: 20,145 PA. pittsburghracer "Little"John
pittsburghracer "Little"John Joined: Feb 2005 Posts: 20,145 PA.	Lots of guys suggested the ride height being to high and its hard to tell from your picture but it very well could be an issue. I changed out a set of super stock springs years ago on my 9 second 74 Duster as the other set had LOTS of runs on them. Well the car sat a little higher and that car was terrible to drive. I removed them that week and took them to a spring shop and had them de-arched some and the car worked great. If possible post some better side, front and rear pictures and the guys on this site will get you straightened out. 1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27 Livin and lovin life one day at a time

Re: Front spoiler for 70 Duster drag car (130mph) [Re: pittsburghracer] #1596321 03/22/14 05:28 PM 03/22/14 05:28 PM
Joined: Feb 2003 Posts: 1,942 Metro Detroit OUTLAWD top fuel
OUTLAWD top fuel Joined: Feb 2003 Posts: 1,942 Metro Detroit	My dart used to get a light feeling above 120, and it helped alot to lower the front, I also added a spoiler from a 69 camaro. The lower valance on the dart made this easy. The duster isn't the same, so the spoiler might not work. The spoiler I used was ABS plastic, pretty flimsy itself, but I fastened the top to the valance, then ran tube supports to the bottom edge. I could putt the car forward from the spoiler, there was no deflection at high speed. Faster, Faster until the thrill of speed overcomes the fear of death... 71 Swinger - slowly collecting dust/parts 66 Belv. II - just a streetcar 88 Mustang - turbo LS beater

Re: Front spoiler for 70 Duster drag car (130mph) [Re: Tig] #1596322 03/22/14 06:06 PM 03/22/14 06:06 PM
Joined: Dec 2006 Posts: 4,647 aotearoa rebel master
rebel master Joined: Dec 2006 Posts: 4,647 aotearoa	Quote: Apologies to OP about the thread hi-jack. Rebel, closing the grill off, how did that effect engine temps? it didn't change it at all. my electric fan pulls sh!tloads of air thru my radiator & i can drive back to my pit after a run with ease.

Re: Front spoiler for 70 Duster drag car (130mph) [Re: rebel] #1596323 03/22/14 06:23 PM 03/22/14 06:23 PM
Joined: Jan 2003 Posts: 9,982 Frostbitefalls MN (Rocky&Bullw... gregsdart master
gregsdart master Joined: Jan 2003 Posts: 9,982 Frostbitefalls MN (Rocky&Bullw...	Check bump steer also. It looks like the front would run through the lights very high, and might be WAY off on alignment. That would cost you handling, and a chunk of ET and MPH. stock A bodys with good alignment and components are good to 130 at least. Also check caster, to see if you have any. You want all you can get. Last edited by gregsdart; 03/22/14 06:23 PM. 8..603 156 mph best, 2905 lbs 549, indy 572-13, alky

Re: Front spoiler for 70 Duster drag car (130mph) [Re: gregsdart] #1596324 03/22/14 06:29 PM 03/22/14 06:29 PM
Joined: May 2004 Posts: 3,210 robin hood country deaks master
deaks master Joined: May 2004 Posts: 3,210 robin hood country	I went from 29.5 tyres to 31" and if the car got a bit of line it was quite unnerving. I fitted 1-1/2" lowering blocks and it was fine after that. Mick 69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200# best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft best 60ft 1.36

Re: Front spoiler for 70 Duster drag car (130mph) [Re: deaks] #1596325 03/22/14 07:35 PM 03/22/14 07:35 PM
Joined: Feb 2011 Posts: 4,302 Nebraska 72Swinger master
72Swinger master Joined: Feb 2011 Posts: 4,302 Nebraska	A problem alot of cars have is to much rake which also has the side effect of giving you way less caster. Caster is probably the largest contributor to high speed stability out of all alignment settings. Lowering the front will not help this condition whatsoever. Mopar to the bone!!!

Re: Front spoiler for 70 Duster drag car (130mph) [Re: MR_P_BODY] #1596326 03/22/14 08:10 PM 03/22/14 08:10 PM
Joined: Aug 2003 Posts: 136 Dallas, TX 4 440Brian OP member
440Brian OP member 4 Joined: Aug 2003 Posts: 136 Dallas, TX	Thanks for all the responses. I think I'll try lowering the front end and checking the alignment/steering linkage first. The car is back halved so I can adjust the rear height easily. I run 8 psi in the slicks. The front suspension has been updated to disc brakes by swapping everything over from a 73 A body. It does seem like the front end is sitting high as I go down the track. I didn't know it was possible to block off the grille and still keep it cool. I added a whole car pic so you can see how it sits. 8084498-DSC00006(1)(640x271).jpg (245 downloads)

Re: Front spoiler for 70 Duster drag car (130mph) [Re: 440Brian] #1596327 03/22/14 08:20 PM 03/22/14 08:20 PM
Joined: Dec 2006 Posts: 4,647 aotearoa rebel master
rebel master Joined: Dec 2006 Posts: 4,647 aotearoa	when you block off your grille, make sure it is flush with the front edge of your car. this leaves a large area for the radiator fan to pull air from behind the new grille panel, as well as improving aerodynamics. my car also uses drop spindles on the front & at speed the car really hunkers down onto the track. the front spoiler in my pic is actually off a Ford but i cut & modified it to fit my car. 8084508-DSC08349.jpg (277 downloads)

Re: Front spoiler for 70 Duster drag car (130mph) [Re: 440Brian] #1596328 03/22/14 08:41 PM 03/22/14 08:41 PM
Joined: Feb 2005 Posts: 20,145 PA. pittsburghracer "Little"John
pittsburghracer "Little"John Joined: Feb 2005 Posts: 20,145 PA.	Quote: Thanks for all the responses. I think I'll try lowering the front end and checking the alignment/steering linkage first. The car is back halved so I can adjust the rear height easily. I run 8 psi in the slicks. The front suspension has been updated to disc brakes by swapping everything over from a 73 A body. It does seem like the front end is sitting high as I go down the track. I didn't know it was possible to block off the grille and still keep it cool. I added a whole car pic so you can see how it sits. Look at your front tire height and look at mine. I'm running exactly 130mph right now and should be a hair over 150 next year and still don't think I will need a front spoiler. Also I'm running 14-32 around 10.5 pounds. At 8 it didn't hook or handle as well. 1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27 Livin and lovin life one day at a time

Re: Front spoiler for 70 Duster drag car (130mph) [Re: 440Brian] #1596329 03/22/14 08:47 PM 03/22/14 08:47 PM
Joined: Jan 2003 Posts: 32,394 Q Quicktree I Win
Quicktree I Win Q Joined: Jan 2003 Posts: 32,394	Quote: Thanks for all the responses. I think I'll try lowering the front end and checking the alignment/steering linkage first. The car is back halved so I can adjust the rear height easily. I run 8 psi in the slicks. The front suspension has been updated to disc brakes by swapping everything over from a 73 A body. It does seem like the front end is sitting high as I go down the track. I didn't know it was possible to block off the grille and still keep it cool. I added a whole car pic so you can see how it sits. theres your problem, the rear is setting lower that the front. looks like the front is at least 5" to high. looks like the wheel is leaning in at the top just setting there. lower that thing and reset the alignment. and you don't need to block off the grill

Re: Front spoiler for 70 Duster drag car (130mph) [Re: 440Brian] #1596330 03/22/14 10:39 PM 03/22/14 10:39 PM
Joined: Nov 2009 Posts: 3,410 Belpre,Ohio C CHAPPER master
CHAPPER master C Joined: Nov 2009 Posts: 3,410 Belpre,Ohio	Quote: Thanks for all the responses. I think I'll try lowering the front end and checking the alignment/steering linkage first. The car is back halved so I can adjust the rear height easily. I run 8 psi in the slicks. The front suspension has been updated to disc brakes by swapping everything over from a 73 A body. It does seem like the front end is sitting high as I go down the track. I didn't know it was possible to block off the grille and still keep it cool. I added a whole car pic so you can see how it sits. That doesn't happen to be a radial tire on the front with a bias ply slick on the rear...? My A-body didn't drive good with a radial/bias ply combination. Others have had no problems, but I sure did. I would have to agree with some of the others, the front looks high to me too. Side pic of mine for comparison. 8084642-freddy'stoy005.jpg (214 downloads) If you like drag racing, support your local track.

Re: Front spoiler for 70 Duster drag car (130mph) [Re: CHAPPER] #1596331 03/22/14 11:12 PM 03/22/14 11:12 PM
Joined: Aug 2003 Posts: 43,097 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,097 Bend,OR USA	My 1971 Duster had issues when I mixed radials and bias plys at first, I ended up finding that I had a bad idler arm, new out of the box My car ran 134+ mph in the 1/4 a bunch of times, no issues with a good alignment and tight steering components. Low rear tire pressures can and will make your butt cheeks pucker when you let off or try to steer it when it is wondering around in high gear I like to run, find, the highest amount of air pressure in the rear tires I can run without spinning them on the starting line for that very reason A freind of mine has added a partial spoiler to his 170 BB Duster, he ran it the width of the front sub frames only in front of the radiator to block air going into the front suspension and K member. He picked up almost a tenth in the 1/4 and some MPH He runs low tens and high nines also with no issues on steerng it on the other end in the 1/4 mile He runs ladder bars on leaf springs with sliders, mine was ladder bars and coil overs with a diagonal link I hope you find out what is causing it , let us know what you find Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Front spoiler for 70 Duster drag car (130mph) [Re: CHAPPER] #1596332 03/22/14 11:12 PM 03/22/14 11:12 PM
Joined: Jun 2007 Posts: 2,646 Plymouth Meeting, PA bigtimeauto Trophy Winner
bigtimeauto Trophy Winner Joined: Jun 2007 Posts: 2,646 Plymouth Meeting, PA	if your ladder bars are to high in the front that will make the car unstable also. My car has a open grille and I have been faster than 175 with no issues at all. I have recently added a 1969 Camaro front spoiler to help hide the belly pan and blower and saw no difference. BB, TT5,Procharged 3300lb Street Car 4.79/154

Re: Front spoiler for 70 Duster drag car (130mph) [Re: bigtimeauto] #1596333 03/22/14 11:28 PM 03/22/14 11:28 PM
Joined: Aug 2003 Posts: 775 Eastern WA P ProStock1320 super stock
ProStock1320 super stock P Joined: Aug 2003 Posts: 775 Eastern WA	Quote: I have recently added a 1969 Camaro front spoiler to help hide the belly pan and blower Pics?

Re: Front spoiler for 70 Duster drag car (130mph) [Re: ProStock1320] #1596334 03/22/14 11:30 PM 03/22/14 11:30 PM
Joined: Jun 2007 Posts: 2,646 Plymouth Meeting, PA bigtimeauto Trophy Winner
bigtimeauto Trophy Winner Joined: Jun 2007 Posts: 2,646 Plymouth Meeting, PA	Quote: Quote: I have recently added a 1969 Camaro front spoiler to help hide the belly pan and blower Pics? BB, TT5,Procharged 3300lb Street Car 4.79/154

Re: Front spoiler for 70 Duster drag car (130mph) [Re: bigtimeauto] #1596335 03/23/14 01:04 AM 03/23/14 01:04 AM
Joined: Dec 2006 Posts: 4,647 aotearoa rebel master
rebel master Joined: Dec 2006 Posts: 4,647 aotearoa	Quote: Quote: Quote: I have recently added a 1969 Camaro front spoiler to help hide the belly pan and blower Pics? not much gain with only a couple of inches, maybe a few more might make a difference.

Re: Front spoiler for 70 Duster drag car (130mph) [Re: rebel] #1596336 03/23/14 01:08 AM 03/23/14 01:08 AM
Joined: Jun 2007 Posts: 2,646 Plymouth Meeting, PA bigtimeauto Trophy Winner
bigtimeauto Trophy Winner Joined: Jun 2007 Posts: 2,646 Plymouth Meeting, PA	Quote: Quote: Quote: Quote: I have recently added a 1969 Camaro front spoiler to help hide the belly pan and blower Pics? not much gain with only a couple of inches, maybe a few more might make a difference. really no need, no more quarter for this car and its runs 155 in the 1/8th BB, TT5,Procharged 3300lb Street Car 4.79/154

Re: Front spoiler for 70 Duster drag car (130mph) [Re: 440Brian] #1596337 03/23/14 01:23 AM 03/23/14 01:23 AM
Joined: Jan 2003 Posts: 11,705 Portage,michigan B B3422W5 I Live Here
B3422W5 I Live Here B Joined: Jan 2003 Posts: 11,705 Portage,michigan	Quote: Thanks for all the responses. I think I'll try lowering the front end and checking the alignment/steering linkage first. The car is back halved so I can adjust the rear height easily. I run 8 psi in the slicks. The front suspension has been updated to disc brakes by swapping everything over from a 73 A body. It does seem like the front end is sitting high as I go down the track. I didn't know it was possible to block off the grille and still keep it cool. I added a whole car pic so you can see how it sits. I would put some air in your near flat rear tires. A tubbed car with big tires going 130 mph should hook easily with WAY more air in the rears. Dragging anything down the track with flat tires will result in ill handling. I would sort out why you can't/ don't run more air before I did anything else. 69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam Best so far, 10.40 @127 1/4 1.41 best 60 foot 6.60 at 103.90 1/8

Re: Front spoiler for 70 Duster drag car (130mph) [Re: B3422W5] #1596338 03/23/14 02:39 AM 03/23/14 02:39 AM
Joined: Jan 2003 Posts: 6,591 Canton, Ohio S Sport440 master
Sport440 master S Joined: Jan 2003 Posts: 6,591 Canton, Ohio	Its not a spoiler issue for sure. Your rear slick psi 8# is way to low and your front end is set to high not helping things. Get your psi up to 12+ or so and lower that front end. Realign and see how it handles. Also check your front end componets for slop.

Re: Front spoiler for 70 Duster drag car (130mph) [Re: Sport440] #1596339 03/23/14 05:18 AM 03/23/14 05:18 AM
Joined: Dec 2006 Posts: 4,647 aotearoa rebel master
rebel master Joined: Dec 2006 Posts: 4,647 aotearoa	i don't consider 8 psi as low. over the years of using the same sized slick, (32x14 with stiff sidewall), i found 8-8.5 optimum pressure for my car, (2959lbs with my fat ass in the chair). i was running 12 psi when i started but found i was running the middle of the slick bald before the sides were loosing all their depth dots. i went lower over the next few seasons settling into the 8's with no adverse affect in top end handling, if fact my 60's improved. when you change to new slicks, cut your old ones open & measure the thickness across the middle, you could be quite surprised.

Re: Front spoiler for 70 Duster drag car (130mph) [Re: bigtimeauto] #1596340 03/23/14 12:19 PM 03/23/14 12:19 PM
Joined: May 2004 Posts: 12,383 Taxes & Virus's R-US, NY Dragula I Live Here
Dragula I Live Here Joined: May 2004 Posts: 12,383 Taxes & Virus's R-US, NY	Quote: Quote: Quote: I have recently added a 1969 Camaro front spoiler to help hide the belly pan and blower Pics? Am I the only idiot that noticed your blower isn't a side slinger anymore like all the pics you normally post? You owe me a reply on the other site you know.... '70 Cuda,...605 EFI Hemi Street Car (6.20 best pass, 1.33 60ft) https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph from inside car) https://www.youtube.com/watch?v=3zQEb9uxFng (6.25 at 108mph from outside car) https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9) '66 Barracuda AWB Stretched nose Blown 440 Car in build stage '71 Duster Drag Car 400 Low Deck 512 best 6.002 at 115.44mph https://www.youtube.com/watch?v=Znuo3jMUXTk

Re: Front spoiler for 70 Duster drag car (130mph) [Re: Dragula] #1596341 03/23/14 12:26 PM 03/23/14 12:26 PM
Joined: Jan 2003 Posts: 32,394 Q Quicktree I Win
Quicktree I Win Q Joined: Jan 2003 Posts: 32,394	thats not a blower it's a pic of one on his front tag plate

Re: Front spoiler for 70 Duster drag car (130mph) [Re: rebel] #1596342 03/23/14 12:28 PM 03/23/14 12:28 PM
Joined: Jul 2005 Posts: 1,301 Penna 7 70satelliteguy pro stock
70satelliteguy pro stock 7 Joined: Jul 2005 Posts: 1,301 Penna	"I don't consider 8 psi as low" Rebel at 2900 race weight that may be true but I know that my car at 3600 race weight is all over the track on top end at 8 psi. I don't think we know what his car weighs going down the track at 130 440 Brian how much does it weigh with you in it??? Last edited by 70satelliteguy; 03/23/14 12:31 PM.

Re: Front spoiler for 70 Duster drag car (130mph) [Re: 70satelliteguy] #1596343 03/23/14 12:42 PM 03/23/14 12:42 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: "I don't consider 8 psi as low" Rebel at 2900 race weight that may be true but I know that my car at 3600 race weight is all over the track on top end at 8 psi. I don't think we know what his car weighs going down the track at 130 440 Brian how much does it weigh with you in it??? Very true... its about the weight.... I run 7 psi on my car but at 2400# and its totally fine.. but a car at 3600 would be squirming all over on top end.. but I dont know his race weight.... weight VS tire size makes a BIG difference

Re: Front spoiler for 70 Duster drag car (130mph) [Re: Dragula] #1596344 03/23/14 03:01 PM 03/23/14 03:01 PM
Joined: Jun 2007 Posts: 2,646 Plymouth Meeting, PA bigtimeauto Trophy Winner
bigtimeauto Trophy Winner Joined: Jun 2007 Posts: 2,646 Plymouth Meeting, PA	Quote: Quote: Quote: Quote: I have recently added a 1969 Camaro front spoiler to help hide the belly pan and blower Pics? Am I the only idiot that noticed your blower isn't a side slinger anymore like all the pics you normally post? You owe me a reply on the other site you know.... I made a bunch of new stuff for a customer so I make changes to my car so theirs can be plug and play. I still run the front license plate when I drive it around the street, pits and to the lanes just take it off when we make a pass. Reply? BB, TT5,Procharged 3300lb Street Car 4.79/154

Re: Front spoiler for 70 Duster drag car (130mph) [Re: bigtimeauto] #1596345 03/23/14 03:11 PM 03/23/14 03:11 PM
Joined: Feb 2007 Posts: 6,295 U.S. M moparniac master
moparniac master M Joined: Feb 2007 Posts: 6,295 U.S.	Still a F2 bob? Mopar Performance

Re: Front spoiler for 70 Duster drag car (130mph) [Re: moparniac] #1596346 03/23/14 03:55 PM 03/23/14 03:55 PM
Joined: Jun 2007 Posts: 2,646 Plymouth Meeting, PA bigtimeauto Trophy Winner
bigtimeauto Trophy Winner Joined: Jun 2007 Posts: 2,646 Plymouth Meeting, PA	Quote: Still a F2 bob? same blower, different location BB, TT5,Procharged 3300lb Street Car 4.79/154

Re: Front spoiler for 70 Duster drag car (130mph) [Re: bigtimeauto] #1596347 03/23/14 04:27 PM 03/23/14 04:27 PM
Joined: Aug 2006 Posts: 1,613 Deerfield, Ohio 70dusterjohn top fuel
70dusterjohn top fuel Joined: Aug 2006 Posts: 1,613 Deerfield, Ohio	I would start with 8 psi ! That's way to low for that big a tire ! I agree that the front end is to high, I had an old DC spoiler on our Duster, It was always stable on the top end ! But when the car was on the edge of a 9 second pass I just couldn't get it there, my pops suggested taking it off ! I didn't really want to, I thought I would upset the car, but did ! Next pass the car went 9.93 with no other changes ? Where running 10.05 10.06 and 10.04 ! The car drove the same as it did with it so I stuck it up in the barn and haven't had it on since !

Re: Front spoiler for 70 Duster drag car (130mph) [Re: bigtimeauto] #1596348 03/23/14 10:29 PM 03/23/14 10:29 PM
Joined: Oct 2007 Posts: 3,978 Hilltown Pa 1967dartgt master
1967dartgt master Joined: Oct 2007 Posts: 3,978 Hilltown Pa	Quote: Quote: Still a F2 bob? same blower, different location You had it at Josh's last race in the front. I guess they just don't look in person. Brett Miller W9 cnc'd heads STR Chassis fabraction

Re: Front spoiler for 70 Duster drag car (130mph) [Re: bigtimeauto] #1596349 03/24/14 10:31 AM 03/24/14 10:31 AM
Joined: Jan 2003 Posts: 9,982 Frostbitefalls MN (Rocky&Bullw... gregsdart master
gregsdart master Joined: Jan 2003 Posts: 9,982 Frostbitefalls MN (Rocky&Bullw...	Quote: if your ladder bars are to high in the front that will make the car unstable also. My car has a open grille and I have been faster than 175 with no issues at all. I have recently added a 1969 Camaro front spoiler to help hide the belly pan and blower and saw no difference. Sounded like the right move, but they must not work as well as one at minimum height of 3 inch? 8..603 156 mph best, 2905 lbs 549, indy 572-13, alky

Re: Front spoiler for 70 Duster drag car (130mph) [Re: 70satelliteguy] #1596350 03/24/14 12:29 PM 03/24/14 12:29 PM
Joined: Aug 2003 Posts: 136 Dallas, TX 4 440Brian OP member
440Brian OP member 4 Joined: Aug 2003 Posts: 136 Dallas, TX	Quote: "I don't consider 8 psi as low" Rebel at 2900 race weight that may be true but I know that my car at 3600 race weight is all over the track on top end at 8 psi. I don't think we know what his car weighs going down the track at 130 440 Brian how much does it weigh with you in it??? It weighs 2950 lbs. with me. I'll try a higher rear tire pressure next time at the track. I checked the steering linkage and didn't find any play. It did seem like I had just a little in the front right wheel bearing. They look allright so I'll re-pack them. The front shock bushings look like they are falling apart, so it's probably high time I replaced them with a racing part. Any suggestions? I ordered an algnment check tool kit, so I'll be taking a close look at the toe.

Re: Front spoiler for 70 Duster drag car (130mph) [Re: 440Brian] #1596351 03/24/14 12:40 PM 03/24/14 12:40 PM
Joined: Sep 2007 Posts: 876 Arizona PolyDart super stock
PolyDart super stock Joined: Sep 2007 Posts: 876 Arizona	I have used one of Randy's spoilers on my '70 Dart. No problems with it holding up what so ever. I couldn't tell you if it helped with stability, since the car has had it since I began racing it. 1970 Dart Resto-Race Project 1960 Dodge Dart Seneca Dual Quad 390 Poly

Re: Front spoiler for 70 Duster drag car (130mph) [Re: 440Brian] #1596352 03/24/14 12:42 PM 03/24/14 12:42 PM
Joined: Jan 2003 Posts: 6,591 Canton, Ohio S Sport440 master
Sport440 master S Joined: Jan 2003 Posts: 6,591 Canton, Ohio	My car weighs the same as yours and it will get drifty on the top end with only 8# and my tires dont look as big as yours. Your front still should come down some IMO. Also dont forget to look at your Lower inner control arm bushings. If they havent been changed by somebody they are probably shot. They were on my car. The rubber part of the passenger side bushing was halfway out when I checked it.

Re: Front spoiler for 70 Duster drag car (130mph) [Re: 440Brian] #1596353 03/24/14 12:53 PM 03/24/14 12:53 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: Quote: "I don't consider 8 psi as low" Rebel at 2900 race weight that may be true but I know that my car at 3600 race weight is all over the track on top end at 8 psi. I don't think we know what his car weighs going down the track at 130 440 Brian how much does it weigh with you in it??? It weighs 2950 lbs. with me. I'll try a higher rear tire pressure next time at the track. I checked the steering linkage and didn't find any play. It did seem like I had just a little in the front right wheel bearing. They look allright so I'll re-pack them. The front shock bushings look like they are falling apart, so it's probably high time I replaced them with a racing part. Any suggestions? I ordered an algnment check tool kit, so I'll be taking a close look at the toe. Have you moved the body height ever without having the front end aligned afterwords... that will kill your alignment... if you check the toe curve(in the MP chassis book) and it toes out at all during the travel it will cause the car to dart around and with low rear tire pressure it WILL get real scary... so you may have multiple things that are wrong/bad

Re: Front spoiler for 70 Duster drag car (130mph) [Re: Quicktree] #1596354 03/24/14 02:03 PM 03/24/14 02:03 PM
Joined: Jan 2003 Posts: 684 St. Charles, MO. S Slingshot383 mopar
Slingshot383 mopar S Joined: Jan 2003 Posts: 684 St. Charles, MO.	In addition to blocking off the grill, fabricating a belly pan from the core support to the firewall would help a lot. 1994 Undercover Chassis 125" altered stack injected big block, soon blown and injected Member of The Torque and Recoil Club

Re: Front spoiler for 70 Duster drag car (130mph) [Re: 440Brian] #1596355 03/24/14 03:21 PM 03/24/14 03:21 PM
Joined: Aug 2003 Posts: 43,097 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,097 Bend,OR USA	When you align the front end rasie it up one inch to simulate the ride hieght at WOT, set the toe in to zero to 1/16 toe in, try to get zero camber on both sides and as much positive caster, upper ball joint to the rear of the lower ball joint, as you can Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

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