track results on slicks..video added
#2101742
07/01/16 11:15 AM
07/01/16 11:15 AM
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Joined: Jan 2003
Posts: 13,382 Marion, South Carolina [><]
an8sec70cuda
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OP
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Made 6 passes at the track this week on the new M/T 29.5x10.5 stiff sidewall slicks. Started out w/ a 1.45 60', and ended up going a 1.34 sixty foot, 5.76 at 122 mph in the 1/8. The radials have been 1.30-1.31 and .08 quicker. MPH about the same. Started w/ 13 psi in the tires, ended up at 15 psi. This big ole car moves around a LOT at 13 psi, lol. Tightening the front rebound a lot and loosening the rear rebound on the shocks made it quicker. Tightening the front made the most difference. Feels like the car is just punishing the tires through the 60'.
The good thing is that I went A to B every pass Wednesday night. That hasn't happened in a long time. The car barely pulls the front wheels off the ground now. Surprising and disappointing. Needs more tuning so hopefully it'll get better.
Last edited by an8sec70cuda; 07/06/16 12:44 PM.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: track results on slicks
[Re: an8sec70cuda]
#2101789
07/01/16 11:58 AM
07/01/16 11:58 AM
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Joined: Oct 2007
Posts: 3,978 Hilltown Pa
1967dartgt
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master
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Hilltown Pa
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Needs more power down low now.
Brett Miller W9 cnc'd heads STR Chassis fabraction
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Re: track results on slicks
[Re: an8sec70cuda]
#2101801
07/01/16 12:13 PM
07/01/16 12:13 PM
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Joined: Jan 2003
Posts: 13,382 Marion, South Carolina [><]
an8sec70cuda
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OP
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Greg...very possible. After my first 3 passes and 2 air pressure changes, I knew the front was rising too fast...so I started w/ shock adjustments. I'll definitely be adding more air next time out.
Brad...I thought so too, so I brought everything in at the hit. Had been running a .2 delay. The car felt pretty good, but actually slowed down. Spun a little and slowed to a 1.37 60'. That was my last pass of the night...until that pass, every pass kept getting faster. Just need more track time.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: track results on slicks
[Re: an8sec70cuda]
#2101848
07/01/16 01:23 PM
07/01/16 01:23 PM
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Joined: Jan 2003
Posts: 6,266 Renton Washington
Triple Threat
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Renton Washington
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At least you now have a solid base to test from, no fun blowing the tires off every run.
-Dustin 67 Dart, 9 second, 392" G3 Hemi 68 Barracuda 340 F/SA
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Re: track results on slicks
[Re: an8sec70cuda]
#2101849
07/01/16 01:23 PM
07/01/16 01:23 PM
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Joined: Jan 2003
Posts: 11,724 Portage,michigan
B3422W5
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I Live Here
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Chip. Nice job. Do you have tubes in them? That will give even more stiffness and stability to the sidewall. I have never run more than 14 in a slick with my old car. But the more air you can get away with, the better.
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, low 10.30’s 1/4 1.41 best 60 foot 6.56 at 104.17
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Re: track results on slicks
[Re: an8sec70cuda]
#2101860
07/01/16 01:38 PM
07/01/16 01:38 PM
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Joined: Jan 2003
Posts: 13,382 Marion, South Carolina [><]
an8sec70cuda
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OP
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Dustin...EXACTLY!!! I was so frustrated after my last trip to the track, I was threatening Ray that I was going to put 32x14s under it, lol.
B3422W5...yessir, I have tubes in them. It still feels like it could use another pound or better. A friend got some video, but I'm not sure if he knows how to post them on youtube. Judging from the way the car felt, it's killing the tires.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: track results on slicks
[Re: an8sec70cuda]
#2101926
07/01/16 03:19 PM
07/01/16 03:19 PM
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Joined: Nov 2004
Posts: 6,890 North Alabama
Monte_Smith
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North Alabama
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The car is probably NOT moving around as much as you think. Cars on radials don't move. They track like they are on rails. Slicks move around, so if you are USED to running radials, when the car wanders a bit on slicks, your instinct is to correct it. Before long you are sawing the wheel and the car is back an forth. Try just holding the wheel straight, let back wander a bit and it will be fine. No way I would think that tire needs any more air on that car.
Have someone who KNOWS what they are looking at, to look at the tire tracks right after you leave. The marks will tell you exactly what you need to do for pressure
Last edited by Monte_Smith; 07/01/16 03:23 PM.
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Re: track results on slicks
[Re: Monte_Smith]
#2104210
07/05/16 01:26 PM
07/05/16 01:26 PM
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Joined: Jan 2003
Posts: 13,382 Marion, South Carolina [><]
an8sec70cuda
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OP
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Monte...I didn't really have to "drive" the car. But you're right, it does FEEL like it's all over the place. It's more of a gentle sway all through 1st gear and into 2nd. After that it levels out. I was hoping to get back out this week, but the temps are gonna be right around 100° the next couple days. Humidity will be up there too...not exactly good racing weather. I'll wait until we get some slightly cooler weather to try it again. Hopefully it'll come around w/ some shock adjustments. If nothing else, I think the slicks look good on the car.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: track results on slicks
[Re: an8sec70cuda]
#2104334
07/05/16 05:18 PM
07/05/16 05:18 PM
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Joined: Nov 2004
Posts: 6,890 North Alabama
Monte_Smith
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North Alabama
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^^^^^^Why?
If it is because the tire is all wadded up.......that is because the car has too much bite.....NOT too little air in tires
Last edited by Monte_Smith; 07/05/16 05:20 PM.
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Re: track results on slicks
[Re: an8sec70cuda]
#2104480
07/05/16 09:36 PM
07/05/16 09:36 PM
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Joined: Jan 2003
Posts: 10,015 Frostbitefalls MN (Rocky&Bullw...
gregsdart
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Have you checked the accuracy of your pressure gauge? I had a name brand unit that was showing eight psi and only six psi true pressure. Yours may be fine, but it wouldn't hurt to check it against known gauges.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: track results on slicks
[Re: an8sec70cuda]
#2104498
07/05/16 09:54 PM
07/05/16 09:54 PM
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Joined: Jan 2005
Posts: 4,243 Charlotte, North Carolina
sgcuda
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Charlotte, North Carolina
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That's a heavy car, Chip. I wouldn't be surprised if you end up with close to 19-20 psi before you find the sweet spot. Running good! Can't wait until we line up side by side.
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Re: track results on slicks
[Re: an8sec70cuda]
#2104725
07/06/16 08:57 AM
07/06/16 08:57 AM
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Joined: Jan 2005
Posts: 4,243 Charlotte, North Carolina
sgcuda
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master
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Charlotte, North Carolina
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Monte, I'm not saying that he needs 20. I'm saying that if 13 was causing the car to wander, and 15 felt more stable, 17 or 18 wouldn't be a bad idea at least to try and see if his 60 ft. comes around. 1 or 2 hits will let him know real fast.
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Re: track results on slicks
[Re: sgcuda]
#2104850
07/06/16 12:24 PM
07/06/16 12:24 PM
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Joined: Jan 2003
Posts: 13,382 Marion, South Carolina [><]
an8sec70cuda
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OP
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Got some video for yall to look at... This was my 4th pass. https://www.youtube.com/watch?v=gQ1gkL5w48g15 psi, .2 NOS delay footbraking. 1.40 sixty foot...lifted before the 330' shocks were... front 8 comp, 7 rebound rear 14 comp, 4 rebound 0 being the loosest setting, 18 being stiffest. This was my 5th pass. https://www.youtube.com/watch?v=pPldnbvAlpwBest 60' of the night...15 psi, .2 NOS delay footbraking. I tightened up the rebound on the front shocks for this pass...went 1.34 sixty foot. shocks were... front 8 comp, 11 rebound rear 14 comp, 4 rebound I know the video quality isn't great, but any suggestions?
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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