Visit The Dirt Forum for More Information

Author Topic:   Wheel hop
crc1124
Dirt Maniac

Total posts: 143
posted May 08, 2005 03:06 PM  
last night was the first night out with our new car. During the heat race I was taking it easy getting a feel for this car. During the feature I ran it real hard. I was driving hard into the corners and it stuck fine. But when I was getting back into the throttle I was getting wheel hop real bad. The track had dried out some but was really fast. I tryed easing into the throttle but it still didn't help. I was getting wheel hop all the way down the straight ways! I'm running afco 250lb on left and 225lb on right. I am running pro shocks. The car is a 79 regal. The rear end is a 10 bolt 8.5 g.m. I'm not running any weight in the left side and I'm not sure of the pinion angle. I don't even know what the rearend is out of. I'm having a hard time finding the straps for the u joint. I'm running beadlocks on both rears and my right tire had lost some air. It was about 12lbs after the race and was warmer than the left. Where do I start to look for the problem?

racer19x
Dirt Full Roller

Total posts: 26
posted May 08, 2005 05:26 PM  
sounds like maybe you went out with too low air pressure in the rears . I have only had mine hop under braking, on pavement with too much pinion angle, or with too soft air pressure, they folded under, then sprang back. just a place to start looking.

racer17j
Dirt Forum Champ
Total posts: 5390
posted May 08, 2005 07:58 PM  
what spring rate on witch side? And you might check your pinion angle!

crc1124
Dirt Maniac

Total posts: 143
posted May 08, 2005 09:24 PM  
The shocks are a couple of years old . I'm thinking tire pressure was part of the problem. I'm not sure what the pinion angle is. What is the best way to change the pinion angle and what is a good angle to run it at? I've heard -4 to -6 degrees. Is drilling new holes in the upper control arms the best way? Thanks for your help guys!

leapinlizard
Dirt Freak

Total posts: 402
posted May 09, 2005 09:23 AM  
pinion wedges are the best way. The wedges are placed between the axle and the spring mounting pad. Just loosen the long u bolts and drive a wedge in there till you get what you want.

Wheel hop comes from the lack of control of the natural freqeuncies of rotating inertia. Bad shocks or flexing control arms as well as spring wrap up or twisting chassis's can cause it as well. Most times I find the stock rubber bushings wear out.

petordragon
Dirt Maniac

Total posts: 167
posted May 09, 2005 11:55 AM  
it is most likely worn out shocks pull them off and see what condition they are in. leave car in park and have buddy push car foward and back and look for loose control arms worn bushings ect.

bubba0six
Dirt Maniac

Total posts: 146
posted May 09, 2005 08:45 PM  
quote:
Originally posted by leapinlizard:
pinion wedges are the best way. The wedges are placed between the axle and the spring mounting pad. Just loosen the long u bolts and drive a wedge in there till you get what you want.

Wheel hop comes from the lack of control of the natural freqeuncies of rotating inertia. Bad shocks or flexing control arms as well as spring wrap up or twisting chassis's can cause it as well. Most times I find the stock rubber bushings wear out.


he is running a coil spring car. yes redrill holes in the upper trailing arms then weld a washer over the holes for added strength. and yes 4-6 degrees is what you want.

crc1124
Dirt Maniac

Total posts: 143
posted May 09, 2005 10:26 PM  
Thanks I'll try these things out one by one. I'll let you know what i find and how it runs this weekend.

    

Back to the Archives