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-   -   New clutch time? (https://www.miataturbo.net/general-miata-chat-9/new-clutch-time-108931/)

joe morreale 01-04-2024 01:02 AM

New clutch time?
 
The other day, while taking a hard pull, my clutch slipped and I smelled it in third gear. It's a fm stage one with 50k on it. 40k at around 200whp. First, should I expect this clutch to fail spectacularly soon? I don't do burnouts or hole hots. I'm going to use tax return money on the car. I have a stock flywheel now. If I drop down to an 11 lb one, will any retuning be needed? The ACT stage one only has capacity for 245 lbs of tq. My car has around 200 or so. Does anyone like the ACT over fm?

rleete 01-04-2024 06:49 AM

Unless abused, a clutch shouldn't go at 50k miles. Have you tried adjusting it?

richbobby 01-05-2024 10:43 AM

If you need a clutch/fw, I’d look at the 949/supermiata offerings over act/fm.

they are a little more thoughtfully designed. The organic disc would suit your power level.

Godless Commie 01-07-2024 10:47 AM

Incorrect flywheel machining dramatically shortens clutch life.
Flywheel surface to boss depth should be 18.67 mm. I have seen as as high as 22 mm, which is a death sentence in short order.

joe morreale 01-07-2024 11:01 AM


Originally Posted by Godless Commie (Post 1644741)
Incorrect flywheel machining dramatically shortens clutch life.
Flywheel surface to boss depth should be 18.67 mm. I have seen as as high as 22 mm, which is a death sentence in short order.

That's very interesting. When I had the flywheel machined, they cut the bosses, but I never knew to measure them. I haven't put any power to the car since it slipped. I guess I'll have to whip on it to see if it slips again. I'll probably buy a clutch and I think I'm going to try a flywheel around 11 lbs. My 6 speed has 180k on it. Thinking about one of those UK low mileage ones to go with it. Got to save a few pennies.


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