RRRacing

iTrader: (1)

New product launch! We are glad to have a new rear differential to all of you with a killer price for a fundamental upgrade. Scrap the little responsiveness from the OE with a more stout diff. It'll vastly improve over the Torsen diff, along with the OE diff's in the IS/RC/GS 350.

You may ask, why is it called the RR Racing Cusco? Simple, we worked closely with them in terms of creating the perfect setup with OUR specs for the friction plates on this design. We've been running this on our very own Supercharged IS-F before feeling confident enough to hand it over to you all!

Our 700+hp Supercharged ISF shop car was equipped from the factory with the Torsen differential. Although better than the open differential in the 2008-09 ISF’s, it still leaves a lot to be desired. We have found that it allows significant amount of wheel slip, particularly in low traction situation or bumps, so we set about tuning our Cusco RS differential to address these issues.

We achieved all our goals including:

• Strong locking action adjusted at the track to achieve sufficient left/right locking without excessive throttle oversteer.
• 1.5 way action to improve braking stability
• Significant improvement in corner exit speed and confidence when applying throttle exiting corners, even with traction control and stability turned off on a 700+whp ISF!

We have them available for:
2008-2014 IS-F
2006-2013 IS350
2014+ IS350
RC350
2006-2012 GS350
2013+ GS350

Starting Price - $1660+

RRRacing

iTrader: (1)

Bump it up for that diff upgrade! Cheaper than OS Giken and steps above the factory torsen.

sheltop225

Whats the real difference between them all? the pumpkin is the same on all isn't it, other than the updated housing for 2010 so u don't have to grind a little clearance on the earlier housings? You list the same cusco for the ISF as the 2014+ IS (985V15), are they really the same? And since the ISF guys put the 2IS diffs in, wouldn't that mean they would also fit the 3IS? I do get that they could be tuned differently for the different HP of the cars, but they would physically fit correct? I'm only just starting to learn about the lsd's, and there's so much to decipher, and I've never actually seen a direct answer to if they are interchangeable...I know the seals are the same part # that I've seen, and obvioulsy different gearing, buf will the diffs fit all the different gearing? are all the gears the same spec other than teeth?


Sorry, I know this isn't the correct forum for this.