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Best diff for road racing?

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58
31
Exp. Type
W2W Racing
Exp. Level
20+ Years
Marietta GA
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!
 

Dave_W

Cones - not just for ice cream
1,025
1,337
Exp. Type
Autocross
Exp. Level
20+ Years
Connecticut
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.
 
58
31
Exp. Type
W2W Racing
Exp. Level
20+ Years
Marietta GA
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.
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.
 

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