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post #1 of 42 Old 02-23-2015 Thread Starter
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AWD modification.

Does anyone know if you can revert the AWD transfer case back to Porsche specs? I read somewhere that the touareg and the cayenne have the same 4wd system but the vw and Audi have software on them to run at a 50/50 split. I'd like a way to go to 70/30 like the Porsche has. The transfecase is set mechanically to be 70/30 split but somehow the computer forces a 50/50 split. The reason I would like to do this is because I drive a rear wheel drive car in the summer (Porsche 951) and I am used to the rear coming out and not pushing like the touareg does in the snow. A bit of a tail out condition is controllable but i hate understeer. Thank you for any help.
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post #2 of 42 Old 02-23-2015
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The torque vectoring is mechanical. You can not change it unless you change the internals of the transfer case.

The touareg is not a sportcar. Its handling is outstanding for a SUV. If you want more sportiness, sell it and buy a cayenne.

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post #3 of 42 Old 02-23-2015
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I am pretty (very) shure that the latest generation Torsen quattro systems have a 40/60 (front/rear) power distribution on all VW and Audi models (with an exception for the R8 which I believe is 20/80). And I also think that goes for the Cayenne, but I might be mistaken there.

For the first generations of Torsen Quattro there might have been a 50/50 split, but that was many years ago (sometimes in the 1990's).

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post #4 of 42 Old 02-23-2015
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Quote:
Originally Posted by Arne S View Post
I am pretty (very) shure that the latest generation Torsen quattro systems have a 40/60 (front/rear) power distribution on all VW and Audi models (with an exception for the R8 which I believe is 20/80). And I also think that goes for the Cayenne, but I might be mistaken there. For the first generations of Torsen Quattro there might have been a 50/50 split, but that was many years ago (sometimes in the 1990's).
Correct. All (Q / Tou / Cay) are 60/40 rear bias.

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post #5 of 42 Old 02-23-2015 Thread Starter
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Ok, 40/60 split. But I found somewhere that when they were making the three (q7, touareg, cayanne) that vw and Audi demanded a 50/50 split and Porsche wanted a 40/60 split. They compromised with the ptm controlling the center diff electronically. But now I can't find it.
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post #6 of 42 Old 02-23-2015
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You might be able to dial out at least some of the understeer by having lower pressures in the rear tires than those in the front.

I'd suggest 4PSI difference would be a starting point but don't go at it like a bull in a china shop - you want progressive oversteer not a sudden snap! - so a little trial and hopefully no error!

So to start I'd leave the fronts as is and reduce the rears to the same pressure and see what you think.

Then up the front 1PSI and drop the rears 1 PSI and try again.

I think if you get to 8PSI difference and it's not happening for you, stop, reset the tires to standard pressures and revert to your plan A.

Oh, and if you kill yourself and/or anyone else you and/or your executors are on your/their own!!
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post #7 of 42 Old 02-23-2015 Thread Starter
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I'll try that. I know its not a sports car but in the snow I'd rather have it oversteer than under steer. Easier to control.
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post #8 of 42 Old 02-23-2015
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I'm talking road manners not snow manners!

What tires are on the car?

Are you using Tiptronic to take control of the car?
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post #9 of 42 Old 02-23-2015 Thread Starter
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Bridgestone blizzaks and using just the normal drive selection. I find I can rotate it in the snow if I get on it hard but driving normal it'll push in corners a lot.
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post #10 of 42 Old 02-23-2015
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as noobytoogy pointed out, try reducing the rear tire pressures. it works for me, and it smooths out the ride a bit too.


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