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Old 11-22-2020, 11:21 PM   #1
martinjs
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Default Clutch choice for EZ36/TY757

I am currently putting an EZ36 from a 2008 Tribeca into my VW Vanagon. I'm mating it to a reversed TY757 5MT from a 2006 Legacy 2.5 non-turbo. I can't find much info on clutch/flywheel choices. A post I read suggested matching the clutch/flywheel to the transmission. I have begun this and found the correct part numbers. While I'm sure the TY757 is up to the task for my conversion (been used by others with this engine and also noted to be good for up to 400hp in stock form from what I've read), I'm not really clear on the flywheel/clutch choice though. Should I worry more about matching the flywheel/pressure plate to the engine? Should I use the flywheel from a car with an EZ engine (some Outbacks in 2006 had the EZ30) with it's pressure plate which may have the greater clamping force needed for the torque of the EZ36? I can't really figure out if a flywheel from a 2006 Legacy 2.5 (ie matching flywheel to transmission) would fit the EZ36 crankshaft. I'm 99.9% sure the EZ30 Outback flywheel would but can't tell if this flywheel/clutch combo would mate with the transmission mainshaft. Any advice or experience would be greatly appreciated.
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Old 11-23-2020, 08:31 AM   #2
snow_bound26
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That is a 5 speed trans right?

Match the clutch and flywheel to the trans you're using. The EZ36 never came in a vehicle with a manual trans in the US and I believe they were matched to a 6 speed in Japan. So if you match it to the engine then the part numbers will show up for the OEM trans and then issues you'll run into could be different overall size (6 speed clutch/flywheel are larger diameter than 5 speed), and push vs pull clutch types. Go with the trans and make sure you know if you need a push or pull type clutch.
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Old 11-23-2020, 09:16 AM   #3
martinjs
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Snow_Bound: Yes, is 5-Spd trans. Sounds like good advice, thanks! I'm ready to pull the trigger on the parts which match to the trans but worried a little about the holding force of the clutch plate.

I wondered, I've been able to find 3.0 cars with 5MT but no 3.6's. Have read a couple of posts where people have mated non-turbo 5 Spd with relatively high powered engines though (up to 400hp?) and report no problems.

I guess if I go the matching clutch/flywheel to trans route, worse case scenario, I upgrade to an aftermarket pressure plate with higher clamping force. Have done this in the past though and found them a little 'grabby' and this vehicle is being built more for comfort/smoothness.

The engine will be tuned more for longevity than power (more conservative tune?) and driven fairly conservatively as a long distance cruiser. I think will be a relatively gentle place for the trans and clutch...well, as gentle as any given that engine's performance.

Any other thoughts out there?
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Old 11-23-2020, 11:12 AM   #4
snow_bound26
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I'd recommend getting in the habit of thinking in terms of torque when discussing power handling for a clutch and trans internals. That's how they're measured is in torque. My experience has been with turbo trans models, so can't speak to an NA trans, but an OEM WRX clutch should work as long as you make sure you get the proper clutch type.
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Old 11-23-2020, 06:49 PM   #5
martinjs
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Quote:
Originally Posted by snow_bound26 View Post
I'd recommend getting in the habit of thinking in terms of torque when discussing power handling for a clutch and trans internals. That's how they're measured is in torque. My experience has been with turbo trans models, so can't speak to an NA trans, but an OEM WRX clutch should work as long as you make sure you get the proper clutch type.
That is very good to know. Anyone any idea of the torque capacity of the stock 2006 2.5 Legacy stock clutch with a TY757 5MT?

I've found a site selling Exedy clutches and they have a stage 1 organic plate clutch which holds 320 ft-lb for $360. Maybe that's the route I should go...
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