Suspension, Brakes, Drivetrain discuss the wondrous effects of boost and your miata...
Sponsored by:
Sponsored by:

FM1 Clutch Slipping

 
Old 01-22-2019, 08:00 AM
  #1  
Design Engineer
Thread Starter
iTrader: (1)
 
DNMakinson's Avatar
 
Join Date: Jan 2013
Location: Seneca, SC
Posts: 3,416
Total Cats: 452
Default FM1 Clutch Slipping

This morning, at 30F,, 5th gear, clutch started slipping. I've had this clutch in for about 4 years, 30K miles. I never did the push rod adjustment, as did not seem needed. I did change cylinders (master and slave) a few months ago.

Cold weather changing friction? Cold air yielding more torque? '99 Stock Rod engine, so I would think well within the limits of this clutch.

Experiences and suggestions?
DNMakinson is offline  
Old 01-22-2019, 08:54 AM
  #2  
Cpt. Slow
iTrader: (25)
 
curly's Avatar
 
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 12,716
Total Cats: 658
Default

Are you turbo charged? Cold weather makes many more boosts
curly is offline  
Old 01-22-2019, 09:42 AM
  #3  
Design Engineer
Thread Starter
iTrader: (1)
 
DNMakinson's Avatar
 
Join Date: Jan 2013
Location: Seneca, SC
Posts: 3,416
Total Cats: 452
Default

Yes I am. Per my pulse width, I am likely about 5% more torque than typical, so about 220 - 230 ft-lbs. So, yes, up a little, but still should be within spec of this clutch, easily.
EBC is holding boost level pretty well (maybe 4 kPa over normal), so the 5% would be more air density related.

EDIT: Just remembered that last month, I replaced the bump stop on the pedal. Perhaps I should adjust position. Perhaps, go underneath the car and make sure the slave plunger is loose.

Last edited by DNMakinson; 01-22-2019 at 10:08 AM.
DNMakinson is offline  
Old 01-22-2019, 06:51 PM
  #4  
Design Engineer
Thread Starter
iTrader: (1)
 
DNMakinson's Avatar
 
Join Date: Jan 2013
Location: Seneca, SC
Posts: 3,416
Total Cats: 452
Default

Update.

This afternoon I checked pedal play and there was some. It was 45*F, but still slipped, not just at 16 psi, but at about 10. So I took it back to waste gate of 7.5.
Looks like I'll have to pull the clutch and take a look.

Will be a couple of months, as I have surgery coming.

So, could it be possible that clutch is finished this quickly?

DNM
DNMakinson is offline  
Old 01-22-2019, 07:12 PM
  #5  
Junior Member
 
BBro's Avatar
 
Join Date: Aug 2016
Location: Chicago
Posts: 144
Total Cats: 19
Default

DNM I had a similar issue where at my same usual power level the FM1 clutch started slipping. I was at 14psi on a GT2560 so no way I was overpowering it. I adjusted the clutch several times to no avail. Ended up pulling it and posting a thread here to see if anyone saw issues with the disc and no one saw anything, check my thread history for details. I ended up swapping in a supermiata sport clutch puck and haven't looked back. I didn't bother trying to have FM look at the clutch or make it right because I was over it. I wonder if there is a manufacturing issues with these?
BBro is offline  
Old 01-22-2019, 07:54 PM
  #6  
Elite Member
iTrader: (5)
 
Erat's Avatar
 
Join Date: Oct 2011
Location: Detroit (the part with no rules or laws)
Posts: 4,879
Total Cats: 399
Default

I never slipped my FM1 clutch at 16 PSI or those power levels. Not sure what would cause yours to slip... I did however slip a SPEC level 2 clutch at like 12psi. With a 2560.
Erat is offline  
Old 01-23-2019, 12:18 AM
  #7  
Newb
 
Join Date: Mar 2012
Posts: 30
Total Cats: 9
Default

How's your rear main seal?

Clutch may be fine, but if the seal starts leaking it wont be able to grab the now greased up friction plate etc.
hks_kansei is offline  
Old 01-23-2019, 06:45 AM
  #8  
Elite Member
iTrader: (6)
 
Join Date: Feb 2013
Location: Staunton, Va
Posts: 3,136
Total Cats: 384
Default

My FM2 has suffered a Similar fate.
ryansmoneypit is offline  
Old 01-23-2019, 07:36 AM
  #9  
Design Engineer
Thread Starter
iTrader: (1)
 
DNMakinson's Avatar
 
Join Date: Jan 2013
Location: Seneca, SC
Posts: 3,416
Total Cats: 452
Default

Originally Posted by hks_kansei View Post
How's your rear main seal?

Clutch may be fine, but if the seal starts leaking it wont be able to grab the now greased up friction plate etc.
New at time of change-out. No oil noticed at rear of engine (XMSN weep port) at oil change last week.
DNMakinson is offline  
Old 02-02-2019, 08:08 AM
  #10  
Design Engineer
Thread Starter
iTrader: (1)
 
DNMakinson's Avatar
 
Join Date: Jan 2013
Location: Seneca, SC
Posts: 3,416
Total Cats: 452
Default

Ordered SuperMiata Organic Sport today, to have on hand when I pull the old one.
DNMakinson is offline  
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
blaen99
Miata parts for sale/trade
9
04-25-2014 02:06 AM
aaronc7
Miata parts for sale/trade
2
06-09-2012 03:50 PM
IcantDo55
General Miata Chat
15
04-01-2012 07:29 PM
aaronc7
Engine Performance
3
02-10-2012 09:31 PM


Thread Tools
Search this Thread
Quick Reply: FM1 Clutch Slipping


Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.