Torsen - torque bias ratio

Rum · 04-16-2008, 01:26 PM

I did some searching but did not find...

So of course the 08 STI has a Torsen diff in the rear. I have been doing some reading on this type of differential and have learned that, when it sends torque to one wheel as opposed to the other, it multiplies that torque by a factor called the torque bias ratio (TBR). I've learned a lot more technical bits about this too, which has led me to the conclusion that, short of having a full AYC system, a Torsen diff is pimp mojo plain and simple. However my question is pretty basic:

What is the TBR on the 08 STI's Torsen diff?

Thanks.

bluedemon_II · 04-16-2008, 01:50 PM

Good question, i would like to know since 04 Sti have the same diff up front. But I don't think it will make much of a difference.

**P&L Motorsports** · 04-18-2008, 02:06 PM

07 STI also have the same rear differential.

supermarkus · 04-18-2008, 02:10 PM

The 04 does not have a torsen up front, it has a suretrac. Similar, but not the same.

I dont know why, but all of the subaru literature lists the front as a helical and the rear as a torsen...

Anyway, I've never seen the TBR listed, maybe it's in the service manual? Torsens are great as long as none of the wheels has zero traction (like with one wheel in the air).

04-16-2008, 01:26 PM	#1
Rum STI Driver Car: DGM 08 STI Fav Mod: Proudly mod-free since 2008 Location: Southern CA Posts: 266 Join Date: Mar 2008 Trader Rating: (0)	Torsen - torque bias ratio I did some searching but did not find... So of course the 08 STI has a Torsen diff in the rear. I have been doing some reading on this type of differential and have learned that, when it sends torque to one wheel as opposed to the other, it multiplies that torque by a factor called the torque bias ratio (TBR). I've learned a lot more technical bits about this too, which has led me to the conclusion that, short of having a full AYC system, a Torsen diff is pimp mojo plain and simple. However my question is pretty basic: What is the TBR on the 08 STI's Torsen diff? Thanks. This ad is not endorsed by this member. Please register or login to hide this ad.

04-16-2008, 01:50 PM	#2
bluedemon_II Grassroots STI Racer Car: 04 Sti Wrb on Silver Location: Hatillo, Puerto Rico Posts: 501 Join Date: Jul 2007 Trader Rating: (0)	Re: Torsen - torque bias ratio Good question, i would like to know since 04 Sti have the same diff up front. But I don't think it will make much of a difference.

04-18-2008, 02:06 PM	#3
P&L Motorsports Authorized Vendor Car: Subaru STI Fav Mod: Tuning Location: Franklin Park, IL Posts: 225 Join Date: Mar 2006 Trader Rating: (0)	Re: Torsen - torque bias ratio 07 STI also have the same rear differential.

04-18-2008, 02:10 PM	#4
supermarkus Spec C Club Car: 08 STi, SSM Location: Edmonds Washington Posts: 1,441 Join Date: Dec 2005 Trader Rating: (0)	Re: Torsen - torque bias ratio The 04 does not have a torsen up front, it has a suretrac. Similar, but not the same. I dont know why, but all of the subaru literature lists the front as a helical and the rear as a torsen... Anyway, I've never seen the TBR listed, maybe it's in the service manual? Torsens are great as long as none of the wheels has zero traction (like with one wheel in the air). This ad is not endorsed by this member. Please register or login to hide this ad. Last edited by supermarkus : 04-18-2008 at 02:13 PM.