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Dragstrip and Launch Techniques Discussion 1/4 mile, 1/8 mile, launch discussions.

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Old 08-12-2012, 01:26 PM   #1
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Wheel hop

So yesterday I went to the track, been there many times. I had an issue I've not had before. My car makes 476/435 at the tires. The problem was wheel hop. Not on the launch but after the 1-2 shift. It got bad enough that I had to lift a little. It's never happened before. The only suspension mod is 1 inch lowering springs. Running nitto nt05 315 wide tires. Set up is unchanged for a year now. Any thoughts?
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Old 08-12-2012, 01:34 PM   #2
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"Wheel Hop" is very simply a rapid and repeated loss and recovery of traction. When a car begins to accelerate various bushings and suspension/chassis components deflect. Under normal driving conditions this flexing is negligible but when the car is launched aggressively the deflection causes significant toe and camber changes which reduce the contact patch of the rear tires. This leads to a reduction in traction and momentary wheel slippage which alleviates the toe and camber changes and allows the rear tires to regrip. The vicious circle then continues as the suddenly improved traction again results in deflection leading to wheel slippage.

Getting rid of wheel hop is typically pretty straight forward. It is all about eliminating flex and thus limiting the movement of the rear tires in relation to the chassis under acceleration. The main culprits to blame for all the flexing are:

Rear trailing arms and their bushings
Toe rods and their bushings
Sub frame, differential, and control arm bushings

Upgrading those items will take care of wheel hop in most instances and dramatically improve traction and control under aggressive acceleration.
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Old 08-12-2012, 01:47 PM   #3
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Nice Apex! I would also add, from experience, a very good alignment is key to zero wheel hop also.
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Old 08-12-2012, 01:48 PM   #4
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Back in the 4th gen days we'd do lower control arms because the stock bushings were too spongy and would let the rearend travel up and down.

I don't have a feel for the 5th gens I'll have to hang out with Alan from BMR at the next race and let him explain it all to me.
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Old 08-12-2012, 01:54 PM   #5
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Thanks apex chase. I knew what wheel hop was but was curious as to why now. I've probably got 250 or more passes with it. The only change to the car was a cam which added a lot of power, but I have been to the track 3 times since then and before last night. Btw what part of Louisville are you in, I drive through there twice a day mon-fri.
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Old 08-12-2012, 02:01 PM   #6
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Originally Posted by TornadoSS View Post
Nice Apex! I would also add, from experience, a very good alignment is key to zero wheel hop also.
Thanks. Proper alignment is also very important.

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Originally Posted by sneakyworm View Post
Thanks apex chase. I knew what wheel hop was but was curious as to why now. I've probably got 250 or more passes with it. The only change to the car was a cam which added a lot of power, but I have been to the track 3 times since then and before last night. Btw what part of Louisville are you in, I drive through there twice a day mon-fri.
That would be hard to nail down. The specific root cause could be any number of things but it boils do to there being more deflection than there has been in the past. We are just east of Louisville in Shelbyville.
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Old 08-12-2012, 02:02 PM   #7
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I'd probably start with the lower control arms, the bushings are probably getting beat up from all your launches. If you had not run DR's before, it will make it worse.
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Old 08-12-2012, 02:14 PM   #8
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Trailing arms and toe arms and bushings along with a diff brace are on the list for my next round of mods. Im going to have a gear installed so that seems like the time to do the suspension. The nittos are the street tires not the dr. I'm waiting for sticky tires until after I strengthen the rear end.
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Old 08-12-2012, 07:58 PM   #9
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Your alignment may have changed which can cause more wheel hop. Cradle bushes cured mine and I did trailing arms later as well.
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Old 08-13-2012, 09:29 AM   #10
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Originally Posted by sneakyworm View Post
So yesterday I went to the track, been there many times. I had an issue I've not had before. My car makes 476/435 at the tires. The problem was wheel hop. Not on the launch but after the 1-2 shift. It got bad enough that I had to lift a little. It's never happened before. The only suspension mod is 1 inch lowering springs. Running nitto nt05 315 wide tires. Set up is unchanged for a year now. Any thoughts?
Quote:
Originally Posted by Apex Chase View Post
"Wheel Hop" is very simply a rapid and repeated loss and recovery of traction. When a car begins to accelerate various bushings and suspension/chassis components deflect. Under normal driving conditions this flexing is negligible but when the car is launched aggressively the deflection causes significant toe and camber changes which reduce the contact patch of the rear tires. This leads to a reduction in traction and momentary wheel slippage which alleviates the toe and camber changes and allows the rear tires to regrip. The vicious circle then continues as the suddenly improved traction again results in deflection leading to wheel slippage.

Getting rid of wheel hop is typically pretty straight forward. It is all about eliminating flex and thus limiting the movement of the rear tires in relation to the chassis under acceleration. The main culprits to blame for all the flexing are:

Rear trailing arms and their bushings
Toe rods and their bushings
Sub frame, differential, and control arm bushings

Upgrading those items will take care of wheel hop in most instances and dramatically improve traction and control under aggressive acceleration.
Hey Sneakyworm, Chase @ Apex hit it perfectly. If there is anyway we can help you out here at BMR Suspension let us know.

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Old 08-17-2012, 11:40 PM   #11
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Quote:
Originally Posted by TornadoSS View Post
Nice Apex! I would also add, from experience, a very good alignment is key to zero wheel hop also.
Yes I have all that stuff Apex mentioned but no wheel alignment yet, I do still have some wheel hop. But not all the time.
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Old 08-18-2012, 05:56 AM   #12
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Hey Sneakyworm, Chase @ Apex hit it perfectly.
Thank you sir.
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Old 08-18-2012, 06:12 AM   #13
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I'd probably start with the lower control arms, the bushings are probably getting beat up from all your launches. If you had not run DR's before, it will make it worse.
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Old 08-18-2012, 09:31 AM   #14
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Hey Apex do you guys do installs also? How hard are trailing arms and Toe Rods to install?
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Old 08-18-2012, 05:36 PM   #15
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Hey Apex do you guys do installs also? How hard are trailing arms and Toe Rods to install?
How hard is subjective but rear trailing arms and toe rods are not bad. It is about a 3 hour job.
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