Drag Racing Discussions > Drag Racing

tire shake ideas?

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225digger:
im no expert either...but the rear engine car i had yrs ago it liked less air, it had a 632 that ran low 7's ... anything over 5.5 it shook i think the sweet spot was around 4.75-5psi to get it perfect...... think i left around 4800.  it was a big hoosier tire i ran cant remember the numbers but it was a very popular tire around 2009.... couple times i was solo and got strapped in and had to wait to run and couldn't check psi and i know they got hot, instant shake..... those bars do look like they hit so that could be upsetting it

fuel749:
Some other info might help.  Trans low gear?  Rear gear? What is that RPM flat on the converter?  Are you saying the problem goes away when the car is hopped up? 

Curly1:
Okay, I am not sure on this but here is my two cents and what I would do. I would lower the wheelie bar so it slows the wheelie down before it unloads the rear tires. regardless the rear tires are spinning then hooking hard.
I am curious, what is the rear gear ratio and converter stall?
Is it a hardtail?
Also what tire pressure are you running? May need less but hard to tell with it unloading rear tires.

wideopen231:
OK I will follow the no expert thing,tire shake wise few are. I will say anytime I have tuned on a car with tire shake,more tire speed was answer. On our funny car if shake a hit more rpm was answer and we left at 6500 to 7000 as was.If shaking thru gear more clutch got rid of it. Now you can go oppisite direction and get rid of it some times and at times that better approach.More than likely you will loose performance backing down and go quicker being aggressive.

 How yo get more tire speed? More rpm,suspenion. wheelie bar and or pressure. While less pressure by reason would mean more hook .I have been told and found true that most of the time less will allow more slippage,but like most thing depends on setup of other factors.

From video I would say car has more than enough tire speed and shake starts as car is unloading tires from wheelie bar hit. In your case I would approach wheelie bar first while leaving launch alone then pressure.

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