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Discussion Starter · #1 ·
this is just my guess, when you're starting to go in first gear from a stop, if you hold in the clutch too long it gives you some nasty vibrations.
other than that i'm stumped. someone please enlighten me. i'll hook you up
 

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Re: define wheel hop for me please (goterps)

Weel hop is when your motor mounts are week or bad and the power of the VR6 makes the weels hop a little for the engine moving. The MK4's have soft motor mounts so I'm always hoping, it sucks and its bad for the car. Motor mounts are on the way.


[Modified by 1KillerGTI, 3:08 PM 4-5-2002]
 

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Re: define wheel hop for me please (1KillerGTI)

wheel hop is that nasty shaking or bouncing sensation you get when your tires have no traction and your motor bounces back and forth.
 

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Re: define wheel hop for me please (tatge)

real violent, real nasty... get some es motor mounts and it's a different world!
 

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Re: define wheel hop for me please (Groundskeeper)

Here's a nice definition from some other page.
" Wheel hop An undesirable suspension characteristic in which a wheel
(or several) moves up and down so violently that it actually leaves the
ground. Wheel hop can be caused by many problems, including
excessive unsprung weight, insufficient shock damping, or poor
torsional axle control. "
True wheel hop is actually jumping off the ground, but there's a related
problem where it just slips and catches repeatedly, and that's pretty
much the same thing, just not violent enough to make it leave the ground.
The engine mounts thing comes up because if the engine is moving
around a lot, it causes a varying amount of torque to the wheels.
Eg. the engine rocks back and when it finally hits its limit, then the tire breaks
so the engine rocks back forward while the tire spins, then when it hooks up
the engine rocks again until hit hits its limits of movement, tires
break loose again.. and so forth. What you want is the engine
not to move, the axles not to cause any non-axial forces and
the wheels to be light and attached via a well damped suspension
to limit movement of everything, and damp out any oscillations
that start.
The stock EDL system activated on dry pavement can also cause something
similar. One tire starts to slip, the EDL kicks in and applies the brakes to
that side so there's a sudden increase in torque on the opposite side
causing it to spin, then that side gets braked and so forth. It's brutal on
the differential as is real wheel hop as power often transfers back
and forth with each hop.
ian
 

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Discussion Starter · #7 ·
Re: define wheel hop for me please (Daemon42)

quote:[HR][/HR]Here's a nice definition from some other page.
" Wheel hop An undesirable suspension characteristic in which a wheel
(or several) moves up and down so violently that it actually leaves the
ground. Wheel hop can be caused by many problems, including
excessive unsprung weight, insufficient shock damping, or poor
torsional axle control. "
True wheel hop is actually jumping off the ground, but there's a related
problem where it just slips and catches repeatedly, and that's pretty
much the same thing, just not violent enough to make it leave the ground.
The engine mounts thing comes up because if the engine is moving
around a lot, it causes a varying amount of torque to the wheels.
Eg. the engine rocks back and when it finally hits its limit, then the tire breaks
so the engine rocks back forward while the tire spins, then when it hooks up
the engine rocks again until hit hits its limits of movement, tires
break loose again.. and so forth. What you want is the engine
not to move, the axles not to cause any non-axial forces and
the wheels to be light and attached via a well damped suspension
to limit movement of everything, and damp out any oscillations
that start.
The stock EDL system activated on dry pavement can also cause something
similar. One tire starts to slip, the EDL kicks in and applies the brakes to
that side so there's a sudden increase in torque on the opposite side
causing it to spin, then that side gets braked and so forth. It's brutal on
the differential as is real wheel hop as power often transfers back
and forth with each hop.
ian[HR][/HR]​
so the tire has to spin? i get "wheel hop" a lot (i think) when i'm going in first gear fairly slowly as well.
 

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Discussion Starter · #9 ·
Re: define wheel hop for me please (FatSean)

quote:[HR][/HR]Does your steering wheel shake too?
[HR][/HR]​
yes, i believe so.
 

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Re: define wheel hop for me please (goterps)

quote:[HR][/HR]
so the tire has to spin? i get "wheel hop" a lot (i think) when i'm going in first gear fairly slowly as well.[HR][/HR]​
Yes, it has to slip. If you're just putzing along and the car is lurching then that's not
wheelhop.
And as for the steeting wheel shaking. If you're experiencing true wheelhop the whole car
will shake violently.
ian


[Modified by Daemon42, 12:03 PM 4-7-2002]
 

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Re: define wheel hop for me please (Daemon42)

I can't imagine the slip-catch-slip-catch is caused by varying amounts of torque to the ground from the motor moving. What I can imagine is the wheel hop being caused by changes in loading of the drive wheels from the motor moving. The motor moving quickly can cause significant changes in the instantaneous loading on the drive wheels, possibly taking the available traction down low enough to allow them to break loose. Then the motor moves back the opposite directly, loading increase, etc etc. There's my lunchtime theory.
 

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Re: define wheel hop for me please (Marty)

The wheels really need to be spinning, ie. burning out, for wheel hop the be happening. It's like the tires are in contact with pavement, and then not really in contact, then in contact. Hense "wheel hop" I could imagine if someone's suspension was not stiff enough it would induce wheel hop when you try to burn out. I've never had it happen in my car personally, the tires just spin. But I've had it happen in other cars.
It's sorta like, they bite, and instead of moving your car forward the suspension absorbs the shock and your wheels come off or almost come off the pavement. Once it starts (during the burnout) it gets worse till you let off the gas. Because it just keeps amplifying.
 
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