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Dog pissing, inner wheel lifting

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Old Jan 13, 2004 | 07:23 AM
  #1  
jetpilot's Avatar
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From: Caracas, Venezuela
Default Dog pissing, inner wheel lifting

Does anyone know the tech from having such a stiff chassis and swaybars that the inner tire lifts in a tight radius corner. I am a member of a formula sae team and I was discussing this as everyone told me that lifting a wheel of the ground is bad and means that the car is unstable and could flip over, as I have seen fotos here of this happening I would like to know if its a desired efect or not (The wheight transfers to the other wheels and promotes better grip but maybe instability is a tradeoff the formula sae for being so small cant afford)
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Old Jan 13, 2004 | 08:37 AM
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From: Garner, NC, usa
Default Re: Dog pissing, inner wheel lifting (jetpilot)

Just based on my experience with SCCA front wheel drive cars, almost all lift the rear wheel when hard into the corners. I have never driven one with this occuring but it is common amoung rabbits, civic hb etc on the track.
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Old Jan 13, 2004 | 09:05 AM
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From: NL, CT, cuba
Default Re: Dog pissing, inner wheel lifting (tpr)

I think I saw a thread about this in the autocross/road-racing forum a little while back, and yes, they described it as "dog pissing" etc whatever.
-PHiZ
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Old Jan 13, 2004 | 07:11 PM
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Default

and does it happen to rear wheel drive cars? Know that I think of it it must not bee any good if the car is rear wheel drive
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Old Jan 13, 2004 | 07:50 PM
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Default Re: (jetpilot)

It can happen in a rear drive car, usually if there is too much roll stiffness in back or binding or reaching the travel limit in the suspension. The only reason it might be desirable in a rear driver is if it has a locked rear end. That would avoid the tendency of a locked diff to push the car straight all the time, turning or not.

Many rear drive cars, especially rear engined ones like Porsche or Fiat 850's, will lift an inside front wheel. As with a front drive car, it's the lightly loaded end of the car and is not a big deal. Not a sign the car is about to flip over. I'm told my old GTI would get most of a foot of air, no drama from inside.

If the drive wheel is lifting and the diff is not locked, bad. You will not be able to get any drive out of the corner until the car is straight again. Look for binding in roll, not enough rebound travel, or too much of the roll stiffness from the anti-roll bar instead of the springs. Adding more roll stiffness to the other end of the car can also help. If you have to choose between getting power down early on corner exit or max gee's in the corner, pick power down early. Note that this is more for autox speeds than roadrace type.
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