07-19-2011, 03:13 PM | #1 |
Drives: Exige, Miata, Ghia Join Date: Jun 2011
Location: CA, Bay Area
Posts: 2,309
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What is wheel hop?
I know what wheel hop is. I have felt it before in my previous cars and I IMMEDIATELY let off the throttle. But I'm curious about why it exists and what causes it?
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07-19-2011, 03:56 PM | #2 |
Drives: Camaro Justice Join Date: Jun 2007
Location: Virginia
Posts: 20,174
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Harmonics. It is a small vibration that resonates, reverberates through the suspension and driveline. It grows and then explodes into a violent potentially damaging condition.
In the 5th Gen a primary contributor to wheel hop is negative camber, riding on the inner shoulder of the rear tire. When the tire breaks loose it loads and unloads (think vibration). A good alignment with minimal negative rear camber brings the tire contact patch square to the pavement. A good solid rear contact patch more evenly loads the tire (think less vibration). In Pedders Book on 5th Gen Suspension we identify the rear sub-frame bushes as low hanging fruit. The OE sub-frame bushes are NVH voided to keep things quiet, but allow the rear sub-frame to twist create uneven loads (think vibration) on the rear tires. Removing compliance i the sub-frame bushes changes the motion and the harmonics of the IRS. Keeping the tires more squarely planted on launch keeps the tires more evenly loaded (less vibration). Movement in the toe link bushes would be the next weakest link. That can be corrected with a set of urethane bushings. The rear strut damping and rear coil rate are additional contributors. A bit firmer and more aggressive damping map will help. The 5th gen is an IRS. A monster sized super strong rear sway bar will help more evenly distribute the load on hard launch. Once again, the goal is to keep the rear tires square up to the track surface or street so they load evenly preventing wheel hop at the source (eliminating vibration) We could continue to remove compliance through the entire IRS including differential bushes, but before we do that we want to address another source of wheel hop. The driver and launch technique. I have seen drivers complain of wheel hop and a different driver in the same car launch cleanly. In a 5th Gen, dropping the clutch at high RPMs is a prescription for wheel hop. We can go one step further and discuss tire composition, track surface and tire pressures as they all are potential sources of wheel hop. Wheel hop is a vibration that grows until it becomes destructive. You can PM PQ about that I have not included parts numbers as solutions because your post didn't ask for what you should buy. It asked what wheel hop is. If I have not answered your question, please ask a follow up and I will do my best. |
07-19-2011, 04:49 PM | #3 | |
Drives: 2014 Z28 camaro Join Date: Sep 2009
Location: Indy
Posts: 705
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Quote:
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07-19-2011, 06:24 PM | #4 | |
Drives: the 2nd amendment home Join Date: May 2008
Location: OK
Posts: 14,707
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+another1
Here's a terrible example... You can even see the resonant frequency in the smoke
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07-19-2011, 06:40 PM | #5 | |
Drives: 2000 Camaro SS Join Date: Feb 2010
Location: Louisville, Ky.
Posts: 25,179
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Here is an excerpt from the article Curing Camaro Wheel Hop on our blog that gives a pretty easy to follow description of what causes wheel hop.
Quote:
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07-20-2011, 10:09 AM | #6 |
Drives: Exige, Miata, Ghia Join Date: Jun 2011
Location: CA, Bay Area
Posts: 2,309
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Thanks guys!
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07-20-2011, 11:52 AM | #7 |
Drives: Camaro Justice Join Date: Jun 2007
Location: Virginia
Posts: 20,174
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07-20-2011, 04:11 PM | #8 |
Drives: 2000 Camaro SS Join Date: Feb 2010
Location: Louisville, Ky.
Posts: 25,179
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