Has anyone installed at any point the Quaife LSD for the SVT? I am wondering what kind of performance gains did you see? Were they noticeable? Did the car feel as if it was grabbing more?
Quaife as of yet does not produce a differential for the 2013 ST although they do provide the differential for the RS500.
I am moving this to "ST performance" for you. As far as I know installing a LSD only helps with gaining more traction. You won't see any performance gains out of it as in more power. It just keeps you from doing the peg-leg burnouts. Also to note, Quaife made differentials for most models of the Focus.
i also know they supply the differential in the RS500 so it would seem logical that an MMT6 gearbox differential would be produced at some point. Especially with the ST being global
That sounds like it was for the MK2 Focus ST which used a volvo engine and gearbox, the 2013 Focus ST uses the MMT6 gearbox, not an M66, so it wouldn't likely work at all.
I installed a Torsen on my svtf. Difference was night and day. The 13's have an e-diff right? I read that a mechanical diff might help if you track your car.
Ok Glad to know Im not insane. I suppose if the original responder had noticed I specified a model and year for my question, then the response of Quaife making an LSD for the ST wouldnt have been given.
I swear....I feel like Im getting Craigslist responses sometimes. Im specific in my ask but I get off the wall responses / answers / questions.
So if you install an LSD does the ECU need to be reprogrammed to understand there is a limited slip differential being run between the axles instead of the open differential?
You don't need to touch the EMS (or ECU if you prefer) for a LSD since this has nothing to do with the motor.
As far as LSD go, if there is one available from OS Giken I would go for that over the Quaife. I have a Quaife on my track car (Lotus Elise) and it does make a substantial difference even though that car already handles very well in a stock form. From what I understand the OS Giken is better than the Quaife but the Quaife is cheaper
I have installed LSD on several cars probably 6 to 8, the difference is tremendous. The most significant difference was when I installed it in my 07ST with a stock motor. I installed the diff prior to installing a turbo. I was amazed what a difference it made in just a stock car. When accelerating though a corner what I noticed was the car pulled though the corner, opposed to just going though the corner. I also installed a LSD on my svt track car that had been sc before I installed the diff. I didn’t have the same night and day reaction when I did the installation one that car but it could be due to the stiffer suspension and stickier tires. However it did really help with inside tire spin on tight corners.
There are several benefits to a diff, one the power the st has it really does not get out of the corners as quickly as it could. When I tracked mine last October the car was fighting for traction one of several tight corners. I know with a diff I would have picked up 5mph up the hill if I could have put the power down. Everyday benefit, traction, my 07 ST has a turbo and make 230 to the wheels it my dally driver, rain snow mud whatever. And the diff make a world of difference, I have a set of show tires on it and have never felt uneasy about driving that car in any winter condition. Even with the turbo if I brake the wheels loose it both wheels and very construable, it put that car against any 4wd car in bad weather.
As for you question regarding the ECU I’m not positive however my thought is it probably not going to have any real adverse affect on the car. The computer is most likely detecting the difference in wheel speed and then applying the brakes, the tq vectoring is detecting the car torque steering and correcting for that. The Diff will reduce both situation there for the computer needing less impute to correct. And if the ECU does go nuts I’m sure it could be adjusted or turned off in a tune.
Thanks for the examples and the explanation. I have read several different web sites regarding the LSD and how it works. I watched a really cool video that actually explained visually how the limited slip works and compared it to an open differential and even toyotas brake differential system.
I figured that the ECU would just see less difference between the wheels in turns and would just compensate less. So this makes me feel a little better! Not that I felt bad before hahaha
It's the other way around.
On the Lotus, the Quaiffe was $950 or so. The OS Giken was twice as much
That being said, I don't know if Giken makes a diff for the ST.
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