Can a 1G AWD be set up to oversteer?

[Turbo442]

To make a long story short...I have a 90 AWD that undsteers like a pig. I suspect that most people that drive their AWD hard and make decent power know what I am talking about.

I have tried the following modications with little sucess:

16x7.5 rims 225 RE730's
17x 7 rims 215 SP9000's
rear 15/16" sway bar with polyeurthane bushings
polyeurthane front and rear control arm bushings
AGX struts
GC coilovers
completely removed front sway bar
welded solid rear trailing arm suspension
front camber plates
custom adjustable rear upper control arms
custom rear polyeurothane subframe bushings
replaced rear LSD
swapped viscous coupler in tranny
alignment
-3 deg camber front
-1 deg camber rear
(honestly I have tried all kinds of camber settings...they all understeer at WOT)
36 psi front and rear
front strut bar

From what I have read, aftermarket differentials are about the only way to really get the car to handle right? Has any one just changed to a limited slip front differential on a 1g and noticed a big improvement? Is really the only solution to understeer to add a Custco front and center diff? My friend recently brought his 2004 EVO RS to my house for the weekend. This was the first EVO imported into the US with a front LSD. (All of the 2005's have it now) This car did seemed neutral when pushed hard in low speed corners. I suspect a big part of this was the front LSD. Yes my car will rotate nicely (oversteer) when I let off the gas, unfortunately letting off the gas to get the car to turn kills any advantage AWD offers through the corner.

 

[bigfoot]

Looks like you've tried the same mods I have. Unless you have $1700 for the Cusco center diff a front LSD will help for power on cornering, and stiffer rear springs with a ratio like 400/350 f/r or 350/300 will help on the fast turns. Your AGXs won't like them but they are likely to blow soon enough and need replacing anyway. Good luck.

 

[DG-FNR]

http://autocross.dsm.org/diffs.html

DG

Learn: http://streetmodified.org/books.html

 

[2-0turbo]

Good article! I was hoping you would say the Quaife was the clear winner at the end, but for 1G guys, guess that is not quite the case. However, I still think the Quaife is better in the front than the open. Worst case, you lift an inside wheel and you revert back to open. At anything less than FULL cornering effort, that is not going to happen (as in unwinding the wheel and feeding in power).

Thanks for the insight on diffs.

 

[jtmcinder]

You should probably wait a few days and the recheck that page that Dennis wrote. It has several errors and omissions that he probably hasn't yet had a chance to fix. Most of all, it doesn't include an accurate description of a Kaaz diif, which is very popular with DSMers.

- Jtoby