Launch Tuning

Old 07-09-2012, 02:15 PM
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dirt91
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Default Launch Tuning

Hi All, To cut to the chase my car seems to launch hard and go straight during the day (wheels up 6.80's) on a clean track. later on after the cool down and track rubbers up it pulls hard left on launch. Is there any way to get a happy medium on this? I needed ladder bar preload on RR to make it work early but now after dark it almost seems like it's too much. Ladder bars are non adjustable so I have to remedy this with shocks or pressures. Shocks are now at 90/10 and 50/50. Thanks for any suggestions!
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Old 07-09-2012, 04:38 PM
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TheYellaBrick
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Lower pressure on right side to essentially make the tire diameter smaller, putting little 'wedge' in it to pull it to the right.
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Old 07-09-2012, 05:40 PM
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dirt91
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right is border line too low at 9, had 9.5-10 in LR to try to correct but no effect. I'm afraid if I add to LR it will lose traction and make it worse. they are 29 12 15 D05 Hoosiers
Thanks!
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Old 07-09-2012, 06:02 PM
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itsabird
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Have you checked, the roll out on your slicks?
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Old 07-10-2012, 05:30 AM
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wmeabates
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If your shocks are adj. you can try more rebound at the left front maybe 70/30.Or if you have travel limiters take some out of the left front.Either will slow the transfer to the right rear.Bill.
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Old 07-10-2012, 01:02 PM
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dirt91
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Thanks for the input guys, I'll check the roll out in the back again but it was pretty close before. Bill, if I install some screws in my upper A arm that will bottom out on rise how much should I limit it vs how it was to see some difference? couple of threads, 1/4" 1/2" ect. I think making that mod now will be better for the future adjustability anyway. Simple enough to try the shock adjust too.
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Old 07-10-2012, 04:23 PM
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wmeabates
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Jack the front up with both wheels hanging.Measure from the fenders down to the tops of the tires,set your stop so the left side is 1 inch less at the tire.Try that.If you you have single adj.shocks you will be taking out compresion when adding rebound,try the the brakes before jumping on them at the strip.The left front might dive.Good luck gitting it strait.Bill.
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Old 07-11-2012, 08:59 PM
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wrightway
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Originally Posted by dirt91
right is border line too low at 9, had 9.5-10 in LR to try to correct but no effect. I'm afraid if I add to LR it will lose traction and make it worse. they are 29 12 15 D05 Hoosiers
Thanks!
Ok correct me if in wrong but hoosier has not made the D05 in that size in 4 or 5 years so maybe the slicks are done
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Old 07-11-2012, 09:00 PM
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wrightway
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Double posted dam phone
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Old 07-11-2012, 09:17 PM
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zipper06
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I'm having a little problem understanding this problem, correct me if i'm wrong, but if the car hooks good and goes straight on the launch, why would you care if the left front tire is carried a little higher and long if the car is performing consistently. My car has always pulled the left front tire higher than the right side (4 link setup). We scaled it a couple yrs ago and did all the correct adjustments, the car runs straight as a bullit but still lifts the left front tire about 4" while the right is barely touching the track. It used to do 4 ft wheelies before scaling the car.

JMO

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