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Re: Front spoiler for 70 Duster drag car (130mph) [Re: bigtimeauto] #1596345
03/23/14 03:11 PM
03/23/14 03:11 PM
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U.S.
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moparniac Offline
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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 Offline
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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 Offline
top fuel
70dusterjohn  Offline
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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 Offline
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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: 9,985
Frostbitefalls MN (Rocky&Bullw...
gregsdart Offline
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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
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440Brian Offline OP
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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 Offline
super stock
PolyDart  Offline
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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.

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
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Sport440 Offline
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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 Offline
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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.
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Slingshot383 Offline
mopar
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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: 43,112
Bend,OR USA
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Cab_Burge Offline
I Win
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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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