front/ rear bias

**audiness** · 10-14-2008 09:18 PM

what is the front / rear bias on our cars? it seems my rear tires are wearing out much faster than the fronts?

**k0mpresd** · 10-14-2008 09:25 PM

there is no set "bias". it is constantly varying until axle to axle rotating speeds are different. then it refers to a set point.

edit: there are lots of threads/posts on this forum about how a torsen differential works.

**oldblu** · 10-14-2008 09:57 PM

Then what's the ratio of 2:1 everyone mentions when the talk about the Torsen?

**andyrew** · 10-14-2008 10:09 PM

http://en.wikipedia.org/wiki/Torsen

Audiness, is your alignment ok? thats what will wear your tires out more.

Its roughly 60r 40f when on power from what I read.

**k0mpresd** · 10-14-2008 10:27 PM

Originally Posted by oldblu

Then what's the ratio of 2:1 everyone mentions when the talk about the Torsen?

when the axles are rotating at different speeds.

and more like 67:33. 40*2 does not = 60. but again, not when on power. axle speed is the key.

**djwimbo** · 10-15-2008 05:14 PM

Originally Posted by audiness

.... it seems my rear tires are wearing out much faster than the fronts?

TBR (Torsen Bias Ratio) has nothing to do with tire wear. I don't care how you drive, and AWD car will still wear the tires off the front first. UNLESS there's an alignment issue.

How are the tires wearing? balding on the inner edges, feathering, feel choppy or out of round?

Have and alignment done, or at least checked.

FWIW: I still love my 4:1 Ian. The "chatter"/vibration thing people talked about at slow speeds or parking lot maneuvers, doesn't exist for me. It did it before(stock 2:1), but not after(4:1). I can't wait for the snow fall, I could get it to slightly oversteer at Grattan by trail braking or heel'n'toe-ing it a bit. It felt great and really controllable after I learned how to manage it.

**somebody5788** · 10-15-2008 05:36 PM

Front tires will always wear faster in AWD an FWD cars. In a RWD it mainly depends on the driver. It's just because your turning them all the time putting more strain on them in a corner then the rear.

Edit: I read yours wrong... lol I guess your on the throttle pretty heavy off the line lol.

**k0mpresd** · 10-15-2008 05:48 PM

Originally Posted by djwimbo

FWIW: I still love my 4:1 Ian. The "chatter"/vibration thing people talked about at slow speeds or parking lot maneuvers, doesn't exist for me. It did it before(stock 2:1), but not after(4:1). I can't wait for the snow fall, I could get it to slightly oversteer at Grattan by trail braking or heel'n'toe-ing it a bit. It felt great and really controllable after I learned how to manage it.

i think that whole deal (the washers) was one of my better accomplishments. :p