If you start competing in AutoX then you might want to upgrade. For track days and driving schools this is a very nice setup.

 

.
when you find yourself in a corner at 10.1/10th's. Do nothing, you're off the track. ... More throttle, you spin. ... Lift, you spin.

As crewchief, I once put our Formula car into the inside wall at Road America's turn 1, at 100+ mph. I overly stiffened front shock rebound and put my driver in a no-win situation. He was not a happy camper.

 

on first gear that is =)
so pretty much when you have a bigger turbo you'll want smoothness when that big bang comes in.
i have a video of a american muscle car i was tailing on the track, tail spin was nasty when he accelerated out of a turn - after that he just drove a lot slower =(

 

which is supposed to be a decidedly more sporting model, it's clear that Audi felt that with the engine output where it was more rear bias was in order. On good gas Mark will easily make 325 HP which isn't so terribly far out of Stock RS4 territory as to make the example invalid.

Regards,

James R.

 

which I shared with Mark...for one reason or another they don't have a lot of their stuff up on the site :-/ Ohh well...not a great way to let people you know you've got cool stuff to sell by now showing it to them...I guess they haven't gotten around to it yet.

Regards,

James R.

 

very different handling characteristics from an A4.

Not flaming you at all. I think it's so rad that you drive that car on the track.

=)

 

You said rad.

 

... it is the best source of info I know of. I had a book mark to it. It is a very good read it you haven't already read it.

Its not mine.
Kirk<ul><li><a href="http://www.sonic.net/garyg/zonc/TechnicalInformation/TorsenDifferential.html">Link</a></li></ul>

 

Handling characteristic is very simular to A4s in steady state cornering situations, I had a chance to drive one at QC. Also remember ryoung is a track instructor. I'm sure he has plenty of seat time in student's A4s and knows what he's talking about.

Besides it's about weight transfer in general. No one disagrees a center diff with more bias has the potential to help. First you have to find out if you need one. Even Stasis agrees you will only see significant improvements on a car that is "maxed out in mods" in other departments. A very high performance suspension and chasis set up qualifies as maxed out in my book. Those race cars probably also has a LSD in the rear, without it I don't see how much more rear torque split can really help. I actually get more inside rear spin coming out of a slow corner.

Being a front heavy car, we set up our cars to have more rear roll stiffness to help it rotate. In a turning situation we have more weight transfer in the rear and will have less overall traction. Yes at corner exit weight will be transfered to the rear but by the time you're heavy on the throttle the steering really should already be unwinded(driving the traction circle).

I think what ryoung is saying and I agree with him is to first find out if he really needs that extra split and then make the decision. Speaking from experience with WYSIWYG's car when he had simular setup(Vortrag/Bilsteins) we were spinning the inside rear wheel coming out of corners at the AutoX. I really don't see the need for more bias toward the rear for that setup.

 

a 300F/300R setup will perform different than a 600F/600R given the car's weight is unchanged... especially understeer tendency