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Suspension / Chassis Questions about your suspension? Need chassis advice?

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Old 10-13-2005, 08:50 PM   #1
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Join Date: Sep 2003
Location: OKC Oklahoma
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Car: 1984 Z28
Engine: L69 305 HO
Transmission: 5 speed manual

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Drag radial tire pressure...recomendations?

Friday night TNT night I am running BFG 275/50/15 DRs. Does anyone have any pressure suggestions? I am running 14.41 @ 96.63 mph on 235/60/15 T/As.By the way Lost to a 2005
Mustang GT he ran a 14.22 @ 96.60 he holeshotted me really bad, a .082 to my sleepy .318 R/T.
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84 l69 305 cid -113 alum heads 55 cc chambers,Comp Cams XE 256-4 hyd flat tappet cam, lifters, pushrods, roller tip rockers and timing set, Weiand 8000 alum intake, Holley 6210-3 spreadbore DP,SLP tri-y coated headers,and MSD 6AL,blaster SS coil and 85551 pro billet distributor Smog delete AC intact,5 speed trans Pro 5.0 shifter with Hurst pistol grip. Auburn pro rear diff and Yukon 3.73 R/P and axles. Summit 3"cutout.Centerforce D/F and rebuilt T5. BFG DR 275/50/15 on American Racing Torque thrust D 15 X 8.5, for track use only. Best time to date 13.99 @ 97.32 mph..more to come?????


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Old 10-14-2005, 12:18 AM   #2
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Car: 86 firebird with 98 firebird interi
Engine: pump gas 427sbc Dart Lil M 13.5:1
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It's not going to take much to stick with those times, would personally start at 18 psi and not go over 20psi, do a good burnout and race away.
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1/8mi. 6.59 @ 104mph
1/4mi. 10.36 @ 130mph

150 shot pass 1.33/6.36/10.11@130mph and Rustang killer
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Old 10-14-2005, 06:00 PM   #3
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Car: 1984 Z28
Engine: L69 305 HO
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Many thanx........Bill
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84 l69 305 cid -113 alum heads 55 cc chambers,Comp Cams XE 256-4 hyd flat tappet cam, lifters, pushrods, roller tip rockers and timing set, Weiand 8000 alum intake, Holley 6210-3 spreadbore DP,SLP tri-y coated headers,and MSD 6AL,blaster SS coil and 85551 pro billet distributor Smog delete AC intact,5 speed trans Pro 5.0 shifter with Hurst pistol grip. Auburn pro rear diff and Yukon 3.73 R/P and axles. Summit 3"cutout.Centerforce D/F and rebuilt T5. BFG DR 275/50/15 on American Racing Torque thrust D 15 X 8.5, for track use only. Best time to date 13.99 @ 97.32 mph..more to come?????


HST RIP
Long live Ronnie (Mister 4 Speed) Sox
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Old 10-15-2005, 05:17 AM   #4
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Heh, with those times you don’t even have to go that far… even 26psi or so with an OK burnout will dead hook off the line with that combination (from experience, I’ve tried it on a simlar, slightly faster car with both 275/50/15 and 275/60/15 BFG DR’s)
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Old 10-15-2005, 11:10 PM   #5
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Join Date: Sep 2003
Location: OKC Oklahoma
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Car: 1984 Z28
Engine: L69 305 HO
Transmission: 5 speed manual

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I think in my case its the driver not the car. Ihave to be the absolute worst drag driver in the history of man. No consistency, poor reaction times, you name it, I can muck it up. Last night I ran 3 runs. First run stock dual snorkel air cleaner,no D/Rs, and thru full exhaust 15.38 with .271 R/T, 95.07. I am testing stock L69 cleaner vs. 3" open cleaner. No good results yet on which is better. Second Run same conditions except 3" open cleaner,14.68@96.21 mph .168 R/T. Third run 15.10@95.89 .065 R/T with open dump,D/Rs,open air cleaner and huge stumble off the line. I need to learn to drive. Could not make more runs due to COBA and huge turnout. Its hard to get better when you only get 3 runs a month.
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84 l69 305 cid -113 alum heads 55 cc chambers,Comp Cams XE 256-4 hyd flat tappet cam, lifters, pushrods, roller tip rockers and timing set, Weiand 8000 alum intake, Holley 6210-3 spreadbore DP,SLP tri-y coated headers,and MSD 6AL,blaster SS coil and 85551 pro billet distributor Smog delete AC intact,5 speed trans Pro 5.0 shifter with Hurst pistol grip. Auburn pro rear diff and Yukon 3.73 R/P and axles. Summit 3"cutout.Centerforce D/F and rebuilt T5. BFG DR 275/50/15 on American Racing Torque thrust D 15 X 8.5, for track use only. Best time to date 13.99 @ 97.32 mph..more to come?????


HST RIP
Long live Ronnie (Mister 4 Speed) Sox
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Old 10-15-2005, 11:10 PM
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