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Old 03-17-2005, 10:01 AM   #11
NTP WRX
Scooby Newbie
 
Member#: 19200
Join Date: May 2002
Chapter/Region: TXIC
Location: Houston
Vehicle:
2006 LGT Wagon
Black

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Quote:
Originally Posted by ripvw
No AWD Subaru should run tires that differ in circumference by more than 1/4" - active differential or not. Subaru makes this clear in every owner's manual of every AWD car they've ever made
Fixed. There are AWD non-Subarus that run F/R tires of different circumference. Porsche and Lamborghini, just to name two.

Quote:
Originally Posted by zacek
The difference in tire diameter between a 245/40 and a 235/40 tires is less than half inch. I just never thought the DCCC controller would pick on that.
As ripvw said, the tolerance listed in the owners manual is a quarter inch. This goes for the STi and standard WRX, Legacy, etc. Basically, by doing what you did the center diff is constantly working to get the front and rear axles spinning at the same rate. It's a lot like towing the car with the front wheels off the ground, only less visible.

Neil.
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