Quote:
Originally Posted by winders
Well, if the car gets real loose under hard braking in a straight line, it could be any of a number of issues. The toe could be off...too much toe out front or not enough toe in at the rear. The alignment could be way off. The corner balance could be way off. You could have too much brake bias to the rear.
Something has to be off for the car to want to go sideways when braking in a straight line. After all, inertia dictates that at object will continue to travel straight unless acted upon by some other force.
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I raced a 911 RS with a very similar set up to yours and had a very stable car. The rear TB was 31mm so that might be part of the issue but I don't think so. Winders is on the money with his advice above. I used to have 2mm total toe in rear and 4mm total toe out in front (most guys use toe in but I found toe out eliminates understeer completely). You can even go to more toe in at the rear, depending how you like the car to behave.