Burn out tire hop...

Old 05-10-2009, 05:47 AM
  #1  
joyfulnoyz
Junior Member
APPRENTICE
Thread Starter
 
Join Date: Dec 2007
Posts: 13
Default Burn out tire hop...

I have a 68 camaro with a 4-link QA1 coil shocks and 31X14.5 goodyear slicks. When I do a burn out the tires really start hopping. Should I stiffen up the shocks will it stop this?
joyfulnoyz is offline  
Old 05-10-2009, 06:59 AM
  #2  
fla1976
Senior Member
RACING JUNKIE
 
fla1976's Avatar
 
Join Date: Aug 2007
Posts: 1,534
Default Shocks

I'd probably try a stiffer spring. What are you running now?
fla1976 is offline  
Old 05-10-2009, 08:26 AM
  #3  
TS1955
Senior Member
DYNO OPERATOR
 
Join Date: Aug 2007
Location: Lost Creek, WV
Posts: 533
Default

I would check tire balance first!

TS1955
TS1955 is offline  
Old 05-10-2009, 08:27 AM
  #4  
TopspeedLowet
Senior Member
DYNO OPERATOR
 
Join Date: Apr 2008
Posts: 504
Default

X2 on that........Bubble balance them and see where you are. Might be just a balance problem?
Bruce
TopspeedLowet is offline  
Old 05-10-2009, 09:55 AM
  #5  
fla1976
Senior Member
RACING JUNKIE
 
fla1976's Avatar
 
Join Date: Aug 2007
Posts: 1,534
Default Tire hop

I kind of ruled out balance as he mentioned that it hopped on the burnout. Thought he would have mentioned a shake at the top end if it had a bad balance. But, I guess you can rule out nothing when you are trying to solve a problem.
fla1976 is offline  
Old 05-10-2009, 01:53 PM
  #6  
TopspeedLowet
Senior Member
DYNO OPERATOR
 
Join Date: Apr 2008
Posts: 504
Default Re: Tire hop

Originally Posted by fla1976
I kind of ruled out balance as he mentioned that it hopped on the burnout. Thought he would have mentioned a shake at the top end if it had a bad balance. But, I guess you can rule out nothing when you are trying to solve a problem.
You are right Paul, When the tire is dynamic or hooked up it is transferring torque it is flat on the bottom and not round, and operating in an in balanced condition smoothly. The minute that it spins free and goes round the imbalance will be magnified. If he could spin during the run he would know it like you would suspect. But if he removed the shocks and had a balanced set of slicks they will spin smooth. The bad shock or wasted spring will just allow it to be detected sooner like you suspected and bounce without control from the shock.
Bruce
TopspeedLowet is offline  
Old 05-11-2009, 07:27 AM
  #7  
dparker
Senior Member
RACING JUNKIE
 
Join Date: Jun 2003
Location: Hobbs, NM
Posts: 842
Default

Where in the burnout is it hopping? Is it way later in your burnout? Could it be squaring up the tires and feel like its hopping? If so it might take another fix.
dparker is offline  
Old 05-11-2009, 08:46 AM
  #8  
joyfulnoyz
Junior Member
APPRENTICE
Thread Starter
 
Join Date: Dec 2007
Posts: 13
Default

I am not sure what size spring it is. How do you tell. At top end there is no vibration or hopping. The tire starts to hop about half way threw the burn out and as you keep going in the burn out the more it hops.
joyfulnoyz is offline  
Old 05-11-2009, 11:48 AM
  #9  
johnracer
Senior Member
DYNO OPERATOR
 
Join Date: Aug 2005
Location: Rifle Colorado
Posts: 585
Default

Maybe it's just trying to hook up. Does it start hopping after you release the line lock and start rolling? If you do long burnouts, try shorter ones. I keep mine to 3 seconds max from start to finish, high gear only......
johnracer is offline  
Old 05-11-2009, 02:23 PM
  #10  
dparker
Senior Member
RACING JUNKIE
 
Join Date: Jun 2003
Location: Hobbs, NM
Posts: 842
Default

Sounds to me like your squaring up your tires. Which means they're doing there job and trying to hookup. Try shorting the distance your burning out, maybe by using a line lock on the front tires.
dparker is offline  

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service