TwinTurbo.NET: Nissan 300ZX forum - There seems to be a general misunderstanding here
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Subject There seems to be a general misunderstanding here
     
Posted by PEwithaZ on August 29, 2003 at 4:05 PM
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In Reply To Omigod, I can't believe the difference my rear Carbing posted by sebring1970 (robo) on August 29, 2003 at 02:21 PM
     
Message of just what tower bars do.

They have little or no effect on body roll. body roll occurs due to vertical forces on the springs and shocks. STB's do not affect these forces and thus do not reduce body roll (anti-roll bars do and this is what they are for).

STB's transfer horizontal forces from one side of the car to the other, and the intent is to reduce chassis flex. In a cornering situation, chassis flex is bad in front because it reduces negative camber on the front wheels. Chassis flex in the rear is bad on cars with IRS because it can cause unstable and unpredictable steering behaviours by the rear wheels (sort of like HICAS). I would suspect that body flex may actually induce additional instability into the HICAS system.

Flex is also bad because over time it can lead to fatigue cracking of critical welds. I tested the effects of both front and rear bars on my car by measuring the difference in front and rear tracking radius at constant lateral acceleration. Not surprisingly, the front bar had the greatest effect in reducing understeer. The rear bar had only minimal effect on this measurement, but it did increase rear end stability at the limit. Of course, if my hypothesis about flex induced instability in the HICAS system is correct, the rear bar may have a more pronounced effect on a TT.

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