Best diff for road racing?

[Anviltester]

Looking for opinions on the best diff for road racing application on a 2018 s550 w/ manual and 3:73 gear set. part numbers would be helpful. Cost is not a concern as racing is expensive lol. Thanks!

 

[Mad Hatter]

If you have the 3.73 gears, does that mean you already have the Torsen?

 

[Anviltester]

If you have the 3.73 gears, does that mean you already have the Torsen?

probably yes (its a pp1 car). but wondering if there are better units out there like os giken or any of the others.

 

[Mad Hatter]

I guess it depends on where you want to take the car.....

 

[blacksheep-1]

I think you will find the Torsen hard to beat, especially if you already own one.

 

[Hye Power]

I had the torsen and switched it over to the Osgiken and i prefer the osgiken.

 

[Dave_W]

With the Torsen, the Torque Bias Ratio is built-in to the design - T2 vs T2R - but there are no clutches that can wear out. The OS-Giken is a clutch-style but has a variety of parts that can be used to tune pre-load, ramp style, and ramp rate. It can work fine off-the-shelf, but to squeeze the most performance out of it you may need to fine-tune it to your application and driving style. Just like adjustable shocks, the more knobs you have, the more ways you can foul it up.

WATCH: How the OS Giken Differential Works and How to Tune it! - MotoIQ

In this video we have a torn down OS Giken limited slip differential we’ll be installing into a customer car, but before we do Mike is going to show…

motoiq.com

 

[Anviltester]

With the Torsen, the Torque Bias Ratio is built-in to the design - T2 vs T2R - but there are no clutches that can wear out. The OS-Giken is a clutch-style but has a variety of parts that can be used to tune pre-load, ramp style, and ramp rate. It can work fine off-the-shelf, but to squeeze the most performance out of it you may need to fine-tune it to your application and driving style. Just like adjustable shocks, the more knobs you have, the more ways you can foul it up.

WATCH: How the OS Giken Differential Works and How to Tune it! - MotoIQ

In this video we have a torn down OS Giken limited slip differential we’ll be installing into a customer car, but before we do Mike is going to show…

motoiq.com

I have a Giken in a miata we race now. can only mess it up if you don't know what you are doing (or don't have an engineer who does lol). I have 2 diffs so maybe I will leave the factory torsen in one and do a Giken in the other. The video was a great explanation.