ACM
20+ Year Contributor
- 679
- 56
- Dec 11, 2002
-
Jamaica Plain,
Massachusetts
This is a seperate post because I think this is one of the biggest improvements I've ever made to the car (aside from Fedja's Ankeny Penske 8760s). It might seem odd to be posting about an LSD in the Handling forum, but believe me, that's where this belongs. LSDs are critical to a well-handling car, and they are at least as important as as any other system when it comes to the behaviour and feel of the car.
In 2002 or so I switched from the OEM VC rear LSD, to a Japanese clutch plate LSD. The improvement was dramatic, we could get into the throttle so hard, so early in the turn compared to the VC, the times tumbled. The only problem was that it wasn't very consistent. Then I switched to 285/30.18 race tyres and I was tearing the diff out of the car every month to reshim and reorder the plates - it was a nightmare, I was driving a different car every event, I never knew how the car would behave from one event to the next, the grip of the 285s just completely overpowered the LSD and the wear rate went through the roof.
I drove a few Evos with TRE's MaxLock service over the last year and was very impressed with how well it worked, so I sent my rear diff to TRE last winter to get an Evo III diff installed with the MaxLock upgrade. I just finished a (lightweight) and all I can say is WOW ! This thing delivered everything my previous LSD promised but failed. The car has been 100% consistent the entire season, something never achieved with the other LSD, and NO wheelspin. None, nothing whatsoever. Yes, one might expect that to be the case - but this is the first time that's actually been true.
If you don't have this in your car you're at least half a second behind on a 60 second run, no matter what other diff you might have in the car. Chances are that unless your LSD is freshly rebuilt, you're a lot more than half a second behind ! I'm sure this remains the case on a road course as well. It's at least as big an improvement as the 35:65 Cusco centre diff was, and it's a third of the price.
In 2002 or so I switched from the OEM VC rear LSD, to a Japanese clutch plate LSD. The improvement was dramatic, we could get into the throttle so hard, so early in the turn compared to the VC, the times tumbled. The only problem was that it wasn't very consistent. Then I switched to 285/30.18 race tyres and I was tearing the diff out of the car every month to reshim and reorder the plates - it was a nightmare, I was driving a different car every event, I never knew how the car would behave from one event to the next, the grip of the 285s just completely overpowered the LSD and the wear rate went through the roof.
I drove a few Evos with TRE's MaxLock service over the last year and was very impressed with how well it worked, so I sent my rear diff to TRE last winter to get an Evo III diff installed with the MaxLock upgrade. I just finished a (lightweight) and all I can say is WOW ! This thing delivered everything my previous LSD promised but failed. The car has been 100% consistent the entire season, something never achieved with the other LSD, and NO wheelspin. None, nothing whatsoever. Yes, one might expect that to be the case - but this is the first time that's actually been true.
If you don't have this in your car you're at least half a second behind on a 60 second run, no matter what other diff you might have in the car. Chances are that unless your LSD is freshly rebuilt, you're a lot more than half a second behind ! I'm sure this remains the case on a road course as well. It's at least as big an improvement as the 35:65 Cusco centre diff was, and it's a third of the price.