Wheel hop

Proper tire/wheel setup, alignment, and launching correctly are all key to eliminating wheel hop (on a good road surface, of course).  Suspension improvements like springs and coilovers make a significant difference also (can cut 1-2 tenths off a quartermile ET!).
 
I had issues on the 1-2 shift with wheel hop/traction. Torrie worked around it by adjusting the shift parameters. Just have to find the ideal shift setup to keep from blasting the tires.


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wasinger3000 said:
I had issues on the 1-2 shift with wheel hop/traction. Torrie worked around it by adjusting the shift parameters. Just have to find the ideal shift setup to keep from blasting the tires.


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This is encouraging.

These heavy AWD cars are spinning tires going into 2nd? How large is your meth nozzle?

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J-Will said:
wasinger3000 said:
I had issues on the 1-2 shift with wheel hop/traction. Torrie worked around it by adjusting the shift parameters. Just have to find the ideal shift setup to keep from blasting the tires.


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This is encouraging.

These heavy AWD cars are spinning tires going into 2nd? How large is your meth nozzle?

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Yeah I used to get wheel spin into 2nd on cold tires. Enough to bring the traction control light on but now it rarely happens.

I'm running a 12 gph nozzle.


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Sometimes a "stutter" between the 1-2 shift has been misdiagnosed as wheel hop.  It can be caused by too much shift pressure but others seem to have eliminated it with a simple transmission fluid change.  The stutter has been described as the car attempting to shift - not shifting - attempting to shift - not shifting and then shifting - all of this in a split second. 

Mine was fine for over a year and a half.  It would chirp the tires on the 1-2 shift easily and on some surfaces, it would break the tires loose completely but I never had wheel hop or stutter.  All of a sudden, mine began this wheel hop or shift stutter crap.  I had the shift pressure reduced and it solved the issue.  When I decided to go drag racing, I changed the transmission fluid and put the higher pressure shift tune back in.  I haven't had the issue again and that has been over a year ago and 30 or so drag strip runs.
 
Interesting point on changing the transmission fluid.  I don't have issues with wheel hop but will be changing my fluid at 30k for preventative maintenance.


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Brandon, I also switched to the softer shift tune for awhile.  It was a discussion with the tuner who put doubt in my mind that I was feeling wheel hop at all.  His point was that the high pressure shift "stutter" feels like wheel hop but is not.  As I said before, when I decided to take my car to the track, I changed the ATF and put the high pressure shift tune back in.  I have not had the issue since even with the high pressure tune.  By the way, I just changed my ATF again after only 10,000 miles just as a precaution.

One other thing to ponder:  Some have suggested that the transmission's adaptive learning feature can play a role in this.  I know of cases where simply reloading the same tune has seemingly eliminated this issue.  For all I know, that is why my issue went away and it had nothing to do with the ATF change.  :dunno:

 
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