B8 A4 Allroad Understeer

the_ace1982

Registered User
Hi folks, as much as I love the handling of my 2011 A4 Allroad I miss my old BMW and it got me thinking there must be an anti roll bar upgrade or similar to improve the understeer of these cars. I don't want to lower it, would be nice to reduce the understeer if possible
 

desertstorm

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I have a 24mm H & R rear bar on my car and that certainly helps understeerr. The best bang for buck mod I ever made though was a home made front strut brace with a piece of aluminium box section and an hour of fettling. I suspect the A4 allroad may have the same L shaped piece of tin as my car had which does very little to stiffen the car.
 

desertstorm

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Interesting, did the strut bar help with understeer or just sharpen the steering up?
It does both. If you fit a thicker ARB it reduces the maximum amount of grip at that end of the vechicle. So to reduce understeer you need to reduce rear end grip or push that the rear generates. Go too far and the car will be tail happy and potentially dangerous for people not expecting it. If you look at this video it's me in my car at Curbrough sprint course quite a few years ago now. You can see that occasionally the car is tail happy when provoked, and on acceleration you can get the rear breaking free a bit. This helps rotation and is a more interesting way to drive. The B8 quattro is a 60/40 torque split rear to front. The chirping noise from the exhaust was because of a mod I made to the DPF. Doesn't do that now.
 
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