Hi Everyone,

I've looked around and seems like the FM2 clutch should easily hold at my power levels with the MK Turbo. The best I can tell by my seat, I'm pushing about 220-230hp (guestimate and hoping for more with an upgraded turbo and intercooler) with a built engine, forged rods/pistons/ARP etc. I went through the 500 mile break in and it seemed ok, but then after a strong 3rd gear pull it slipped and burned it. Now I'm noticing slipping in 5th if I get on it at all and other gears too. I'm thinking I ruined it already after burning it. Will the 6 puck disk from ACT fit with the FM pressure plate or should I just resurface the flywheel and put in another FM2 clutch plate and just be very careful for maybe 1k miles? Here is mine, the black/silver one that needs some cosmetic love still.

 

The FM2 should easily be able to handle that kind of power. I've got their stage 1 in my car (probably around 200 WHP) and it's been holding up fine for 10K miles boosted and probably another 10K NA. A friend of mine runs the FM2 in his car that's supposedly around 270 WHP and he's had good success with it.

If you enjoyed the feel of the FM2 I'd just grab another one to keep things simple. Any possibility the rear main is leaking and got oil into the clutch assembly? Not sure how realistic that is, but if there's oil dripping where the bellhousing meets the block it might be a clue.

 

The feel is pretty good and now that you mention it I do have a slight leak back there somewhere that might contribute to that. Ugh...this would be the 2nd time changing the clutch since I got it running, 1st one the guy fubar'd the install and it tore up my original setup.

 

Not saying that's for sure the issue. I definitely have had some leaks in that area without my clutch slipping, but it's the first thing that comes to mind for me. If the clutch is slipping I don't imagine it's going to randomly get better.

 

Thank you for pointing out what should have been obvious to me. One of these days I'll have it all together with no leaks!

 

Thanks for the advice! I'll have to consider that even though it's gonna be a bit for the upgraded turbo, for now that's in the wish list still. I still have a thousand other projects to get to first

 

Based on what? Have you tried to install an ACT friction disc with an FM pressure plate?
I have used 2 different supermiata friction discs with my FM2 pressure plate on my stock Mazda flywheel with no issues.
I think you are the AI bot guy... And don't know what you are talking about.
Can we get this phony Banked guy banned or something?

 

Please do your own research and don't blindly rely on low post count contributors like banked. I just checked my scrap pile and grabbed an FM, Happy Meal Stage One pressure plate. The friction surface is at or just slightly shy of 225mm. The ACT clutch disc I found online was 224mm OD. The only way a friction disc won't work (after it fits onto the shaft with hole diameter and matching splines) is if the friction surface is too thick/thin or it's wider than 229mm. Too large of an OD would hit the flywheel towers. Of course, anything not touching the friction surface between the FW and PP would be wasted material. Similar to brake pads, you can see on most cars that they don't contact the full rotor friction surface. There is usually a rusted ring of friction surface near to the hub.

BRB, I forgot I had my 30k-mile OEM flywheel, friction disc, and Mazdaspeed pressure plate.
Friction surfaces measure:
FW = 226mm
PP = 226 mm
Disc = 210-212

If the clutch parts match your Miata generation (NA1, NA2, NB, etc) they will bolt up and work >99% of the time. Nearly 25 years ago I used a stronger ACT Miata PP on a 1995 Escort GT that I had turbocharged. There were few performance parts for the Escort (Mazda Protege/323) and every time I asked at parts stores, they assumed it had the 1.9 Ford engine. Often they would select that option without asking and I got tired of being handed incorrect parts so I started telling them I owned a Protege.

 

I was thinking the same thing based on a handful of posts.

 

My happy meal lvl 1 was holding 22psi on a built motor with a gtx2860 gen 2 in my black car, roughly 300whp. I would think fm2 is overkill for your current power level.

My first fm1 started slipping during break-in , iirc I rolled over the input shaft seal, and it completely soaked the friction disk. It's certainly possible a ream main could also leak enough to cause issues as well.