Clutch Masters Twin Disk... any reviews?

[KeithMac]

You really need to have a go in a car with one fitted, they are perfectly driveable but I wouldn't go so far as to say stock engagement.

Plus I have solid engine mounts and solid diff bushes (both great upgrades) which takes slack out of the running gear.

[2fnloud]

You going to be at NG?

[KeithMac]

Bit too far for me to travel unfortunately (I'm in UK)..

[thor'svr4]

Keith thank you, I have been eyin this clutch though RHDJapan.com. I wonder if the green pressure plate would change the price? Because $1,331.02 + $93.64 shipping, is a GREAT price. Sounds like the yellow plate would be exactly like stock then.

And I am not stock I have the Centerforce clutch in my car now (came with the car)

Wow thats actually a really good price on what looks to be a very nice clutch. Ill have to consider that route.

One thing im curious about, does a lighter clutch/flywheel setup actually reduce the likelihood of being 'blocked' out of gear? One of the Spec clutches on 3SX's website actually states that its a custom spec clutch designed to be lighter to allow a quicker shift without being blocked out of gear... Can any of you clutch gurus shine some light on this? I see a lot of people discuss how a light flywheel can help with downshifting, and that makes perfect sense to me. But can a ligher aftermarket clutch/flywheel combo actually help prevent being blocked out of gear? My trans is only about 2-3 years old but i sometimes get blocked out of 2nd gear if i try to shift fast at the top of 1st gear. This is one of the reasons im looking at a lighter multidisk setup. opinions?

[KeithMac]

A heavy centre plate can make the synchros struggle to slow the input shaft down to same speed as the output shaft.

Flywheel and pressure plate are supported by the crank so the main gain there is faster engine response due to decreased inertia, downside to that is it's easier to stall though..

[anyonebutme]

The disk itself adds rotational mass to the input shaft, so less mass means the shaft can change speeds faster which means synchros can do their job better. However, just because a clutch has a total lighter package doesn't mean the disk(s) themselves have a lower inertia. You gotta weigh the disks, and with their diameter tells you their inertia.

[thor'svr4]

The moment of inertia is related to Radius^2, so im assuming its more important to get a smaller disk than a lighter disk. Ill measure my stock disk when i get home from work since i think its likely a similar diameter to the OS... or atleast from the pictures it looks similar. Would you have to account for now having multiple disks? Its been a while since i had to actually use my brain for even basic physics problems.

[anyonebutme]

Yes, you have to multiply by how many disks you have

[Chris@Rvengeperformance]

The moment of inertia is related to Radius^2, so im assuming its more important to get a smaller disk than a lighter disk. Ill measure my stock disk when i get home from work since i think its likely a similar diameter to the OS... or atleast from the pictures it looks similar. Would you have to account for now having multiple disks? Its been a while since i had to actually use my brain for even basic physics problems.

That's 100% correct and why most multi disc clutches are smaller in diameter, so their MOI total ends up being less or comparable to a single stock disc. If you just popped 2 stock discs together in a clutch setup it would be way too heavy to shift.

I don't think you can automatically assume a multi disc clutch will shift better though. Even if the moi is the same or less than stock you have to worry about the floater moving around and causing some drag. I don't design clutches for a living, but that's my opinion.

[Bloodlust182]

BTW guys the TOB is not included in that deal at RHDJapan. "SPECIFICATIONS: - Movement kit with Bearing and Sleeve Sold Separately"