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Re: Front spoiler for 70 Duster drag car (130mph)
[Re: Locomotion]
#1596309
03/21/14 09:51 PM
03/21/14 09:51 PM
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Joined: Feb 2005
Posts: 20,154
PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,154
PA.
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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
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Re: Front spoiler for 70 Duster drag car (130mph)
[Re: 440Brian]
#1596310
03/21/14 10:01 PM
03/21/14 10:01 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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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)
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Re: Front spoiler for 70 Duster drag car (130mph)
[Re: dezduster]
#1596312
03/22/14 01:39 AM
03/22/14 01:39 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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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
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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
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Joined: Dec 2006
Posts: 4,647
aotearoa
rebel
master
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master
Joined: Dec 2006
Posts: 4,647
aotearoa
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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.
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Re: Front spoiler for 70 Duster drag car (130mph)
[Re: rebel]
#1596314
03/22/14 08:07 AM
03/22/14 08:07 AM
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Joined: Jan 2003
Posts: 2,915
A shed in England
Tig
master
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master
Joined: Jan 2003
Posts: 2,915
A shed in England
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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
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Re: Front spoiler for 70 Duster drag car (130mph)
[Re: 440Brian]
#1596315
03/22/14 09:25 AM
03/22/14 09:25 AM
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Joined: May 2004
Posts: 12,383
Taxes & Virus's R-US, NY
Dragula
I Live Here
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I Live Here
Joined: May 2004
Posts: 12,383
Taxes & Virus's R-US, NY
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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...
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Re: Front spoiler for 70 Duster drag car (130mph)
[Re: Dragula]
#1596316
03/22/14 09:35 AM
03/22/14 09:35 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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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.
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Re: Front spoiler for 70 Duster drag car (130mph)
[Re: SpareParts]
#1596319
03/22/14 02:38 PM
03/22/14 02:38 PM
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Joined: Apr 2007
Posts: 2,026
Trumbull,CT.
jim sciortino
top fuel
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top fuel
Joined: Apr 2007
Posts: 2,026
Trumbull,CT.
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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.
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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
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Joined: Feb 2005
Posts: 20,154
PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,154
PA.
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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
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Re: Front spoiler for 70 Duster drag car (130mph)
[Re: pittsburghracer]
#1596321
03/22/14 05:28 PM
03/22/14 05:28 PM
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Joined: Feb 2003
Posts: 1,942
Metro Detroit
OUTLAWD
top fuel
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top fuel
Joined: Feb 2003
Posts: 1,942
Metro Detroit
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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
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Re: Front spoiler for 70 Duster drag car (130mph)
[Re: Tig]
#1596322
03/22/14 06:06 PM
03/22/14 06:06 PM
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Joined: Dec 2006
Posts: 4,647
aotearoa
rebel
master
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master
Joined: Dec 2006
Posts: 4,647
aotearoa
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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.
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Re: Front spoiler for 70 Duster drag car (130mph)
[Re: rebel]
#1596323
03/22/14 06:23 PM
03/22/14 06:23 PM
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Joined: Jan 2003
Posts: 9,985
Frostbitefalls MN (Rocky&Bullw...
gregsdart
master
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master
Joined: Jan 2003
Posts: 9,985
Frostbitefalls MN (Rocky&Bullw...
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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
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Re: Front spoiler for 70 Duster drag car (130mph)
[Re: gregsdart]
#1596324
03/22/14 06:29 PM
03/22/14 06:29 PM
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Joined: May 2004
Posts: 3,210
robin hood country
deaks
master
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master
Joined: May 2004
Posts: 3,210
robin hood country
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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
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