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Old 06-26-2013, 12:24 PM   #1
Tjrommel
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I'm a newb

When referring to wheel hop and associating it with motor mounts... Is wheel hop the literally the wheels hopping annoyingly causing my car to jerk and have the engine smacking the cross member rendering the mount useless?


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Old 06-26-2013, 12:25 PM   #2
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How is the ride effected by stiffer mounts such as Cobb?
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Old 06-26-2013, 12:54 PM   #3
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Quote:
Originally Posted by Tjrommel View Post
When referring to wheel hop and associating it with motor mounts... Is wheel hop the literally the wheels hopping annoyingly causing my car to jerk and have the engine smacking the cross member rendering the mount useless?
Wheel hop is the car gaining a loosing traction under hard acceleration, this causes wheelspin so the car can't accelerate and then regains traction and starts the process over again, on the focus this causes the engine to bang around, on more powerful cars this can lead to tearing up the differential. The RMM upgrade will hold the engine in place better, which should help with longevity.
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Old 06-26-2013, 01:36 PM   #4
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So it's actually my engine banging around when I turn track off and break lose. It's a very destructive sound lol
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Old 06-26-2013, 02:02 PM   #5
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watch this video it shows what happens with the stock mount
YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.
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Old 06-26-2013, 02:09 PM   #6
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http://www.mc2racing.com/tech/20061012a/

Please read and be educated.

To prevent frequent wheel hop without buying parts, ensure that your alignment is correct and that your tires are inflated correctly.


--- Motor mounts have little or no effect on wheel hop ---
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Old 06-26-2013, 03:30 PM   #7
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Quote:
Originally Posted by mac.mogul View Post
http://www.mc2racing.com/tech/20061012a/

Please read and be educated.

To prevent frequent wheel hop without buying parts, ensure that your alignment is correct and that your tires are inflated correctly.


--- Motor mounts have little or no effect on wheel hop ---
That's a great article, and I agree with it--with one exception. Changes in toe are not the only cause of wheel hop.
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Old 06-26-2013, 04:11 PM   #8
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Quote:
Originally Posted by mac.mogul View Post
http://www.mc2racing.com/tech/20061012a/

Please read and be educated.

To prevent frequent wheel hop without buying parts, ensure that your alignment is correct and that your tires are inflated correctly.


--- Motor mounts have little or no effect on wheel hop ---
Well, tell that to everyone who swapped motor mounts then experienced significantly less wheel hop...

No substitute for reality...
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Old 06-26-2013, 04:11 PM   #9
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Can you elaborate on your thoughts? What else causes wheel hop under hard acceleration?
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Old 06-26-2013, 04:19 PM   #10
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The engine is connected to the transmission, if the engine moves too much it yanks on the transmission, which yanks on the axles as well, this jerking causes the wheels to hop, it's made worse with the traction control on as the car attempts to brake the "slipping" wheel and tended to clang harder, although it still moved too much with the traction control off on the old car.

YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.


This video shows how severe the engine movement was on the ST with the same rear mount. 5/8 of an inch of movement and the lower mount smacking against the subframe in a violent release of energy.

If this was not somehow also related to the bang shift issue on the ST there would not be a technical service bulletin to replace every motor mount on the ST in order to resolve this issue.

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