[e93WhiteonRed]

So I know from my mustang days that if you pop the clutch and get wheel hop, you've got some work to do regarding your control arm bushings, especially if you had a 03-04 cobra with the IRS.

No matter how I manipulate the DTC button, and whether wet or dry, I always get the most violent wheel hop from the dig. Is this typical with these cars, something that the flexy e93 is more pone to, or is there something in my suspension setup that I've got to address?

[scalbert]

I normally just spin one wheel in my E92 but did get some nasty hop on a recent launch. But that is not typical.

[cn555ic]

Hmm i am fully bolt on and all I get is wheel spin. That's to me would indicate that the tires have no grip. I would think wheel hop is tires that are gripping

[Jeff@TopGearSolutions]

Without serious modifications to the suspension geometry you wont get rid of wheel hop.

http://www.e90post.com/forums/showthread.php?t=387147

I already made a thread about this....

[techlogik]

Wheel hop has to do more with the suspension toe angle changing as the wheel gains/loses traction and the suspension travels up/down/forward/backward under acceleration. That is the short version. Bushings are usually the culprit no?

[e93WhiteonRed]

Originally Posted by techlogik

Wheel hop has to do more with the suspension toe angle changing as the wheel gains/loses traction and the suspension travels up/down/forward/backward under acceleration. That is the short version. Bushings are usually the culprit no?

That would make sense that without a LSD each rear wheel might be trying to walk too far forward than the other when it has traction - so like slick said probably nothing I can do about it unless I do some serious modifications and a LSD. Anyone with a LSD installed reduce their wheel hop?

[techlogik]

Originally Posted by e93WhiteonRed

That would make sense that without a LSD each rear wheel might be trying to walk too far forward than the other when it has traction - so like slick said probably nothing I can do about it unless I do some serious modifications and a LSD. Anyone with a LSD installed reduce their wheel hop?

LSD has the same issue, I believe it is caused primarily by the toe changing while the tire grabs traction, LSD won't solve that problem. I think it is the suspension bushing components/rigidity?

RTABS etc? Maybe? Rod ends or spherical bearings at joints instead of bushings might be the final cure to remove that flexibility?

Guess we won't know until somebody has solved it and what parts it took to solve it. But then again, I don't do burnouts and don't have this issue....

[klipseracer]

I Never got wheel hop... I drove a 2nd generation FWD eclipse so I definitely know what it is

I always spun one wheel. Wheelspin was so common sometimes the only way I knew I was getting it was the flashing light on my dash... There was never any violent hopping. This is on an e90. I'd say stiffen up your suspension and make some adjustments. My car never got it even while boosting 15psi

[klipseracer]

Harry has the solution here:

Summary: We need to have a Pinion snubber.

http://www.e90post.com/forums/showpo...7&postcount=17

When horsepower is suddenly delivered to the differential, whether from a clutch or a torque converter, the pinion attempts to "climb" the ring gear. This sudden shock of torque causes the entire rear axle housing to rotate backwards in a counter-clockwise direction. This causes the springs to distort, resulting in severe driveshaft/U-joint misalignment.

Spring Reaction Unloads Suspension, Causing "Wheel-Hop":

This is odd because I think some of us do not have this problem.. Perhaps there is something else that causes this 'climbing' to happen in some cars. Maybe some people do not have as good of traction?

[ultimateendz]

Toyo R888 + LSD + full m3 parts + Koni DAs w/ custom 900lb rear spring rates will make your e93 VERY happy...trust me

[e93WhiteonRed]

Originally Posted by ultimateendz

Toyo R888 + LSD + full m3 parts + Koni DAs w/ custom 900lb rear spring rates will make your e93 VERY happy...trust me

So will some of your disposable income being sent my way

[Jeff@TopGearSolutions]

Softer tires is a cheap alternative, it wont be a 100% solution, but it may help.

I remember on my FWD car, Snow tires hooked up nicely, or spun, when I went to an autox compound I had crazy wheel hop with no other changes to suspension.

[techlogik]

Originally Posted by klipseracer

Harry has the solution here:

Summary: We need to have a Pinion snubber.

http://www.e90post.com/forums/showpo...7&postcount=17




This is odd because I think some of us do not have this problem.. Perhaps there is something else that causes this 'climbing' to happen in some cars. Maybe some people do not have as good of traction?

Isn't that what I just described? It is the angle of the toe that is changing causing the hop. The drive train and the suspension are allowing the torsion movement that changes the toe and the wheel to lose/gain traction.

In this case, he describes it as the housing of the differential and independent suspension, rather the trailing arms etc..that are allowing the toe change leading to the wheel gaining/losing traction and the hopping movement.

Solid axel/welding diff to frame seems to be the guaranteed fix according to that post. Bust stiffer/better RTABs can't hurt. It may just raise the limit when it occurs ultimately.

[klipseracer]

Originally Posted by techlogik

Isn't that what I just described?

I suppose so however the other post was made back in may and since I'm stupid it seemed a bit more clear visually.

[shifterboy45]

Originally Posted by klipseracer

Harry has the solution here:

Summary: We need to have a Pinion snubber.

http://www.e90post.com/forums/showpo...7&postcount=17




This is odd because I think some of us do not have this problem.. Perhaps there is something else that causes this 'climbing' to happen in some cars. Maybe some people do not have as good of traction?

this is a valid explanation of wheel hop on a solid axle car. remember the BMW differential housing is suspended by 2 parallel thrust arms (control arms) which allow the diff to change its axis, plus the axles have constant velocity joints on them to retain a certain amount of suspension geometery.

wheel hop is usually a suspension loading problem -- on solid axle cars it easier to restrict the axle housings vertical travel, and reduce the hop by closing the distance the housing travels til it stops.

lagging dampning in the rear shock, or weak coil springs can exhibit the same type of problem you are running into ..

[ultimateendz]

Originally Posted by e93WhiteonRed

So will some of your disposable income being sent my way

LOL...my wallet is still recuperating from all this tire/suspension madness...lol

[Kbudz94]

Originally Posted by e93WhiteonRed

So will some of your disposable income being sent my way

Right? XD

[nicky dj]

Is the consensus on this issue still to get one of those differential locking brackets versus anything else suspension related?