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Old 09-02-2016, 01:31 AM   #1
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Default Slipping clutch on the dyno only (?)

Hey,

I got a 97 turbo miata @ 15psi with a small turbo, on the street the clutch will hold very good and the car drives very hard.
I just got on the dyno yesterday, the the clutch slipped from the first try to do a full swipe, lowering boost to 12psi - didn't help. (very noticeable smell was present)

I had my clutch pedal bump-stop torn, after that the clutch pedal was adjusted in order to have lest dead travel.
All was good, then, I got the pedal bump-stop and installed it, at the first run, the clutch slipped like never before - all the time in low boost. (btw no noticeable smell was present)
The pedal was adjusted again and no slippage !
Could all this have something to do with the dyno slip ?

New clutch ? pedal adjustment ?

If I get a new clutch should I take a light flywheel for a street car or not ? (fm 10lb)
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Old 09-02-2016, 02:00 AM   #2
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Double post
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Old 09-02-2016, 02:01 AM   #3
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I just re'clutched and chose the stock flywheel for Street.
Too light and you can get transmission chatter. Which I understand is not noticeable at14lb. Depending on clutch weight etc.

However I would definitely prefer the added gains. And would have bought a lighter one if I was not forced into an engine swap and had extra funds.

Someone correct me if I'm wrong.
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Old 09-02-2016, 09:08 PM   #4
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That make no sense. If it slips on the dyno in 4th it should slip on the street in 4th and certainly in 5th.
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Old 09-02-2016, 11:23 PM   #5
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Higher gears slip more, since the cars has more resistance. If you're doing dyno pulls in 4th, redline is ~120 indicated. Have you actually done that on the street?
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Old 09-03-2016, 04:53 AM   #6
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On the dyno we run 5th gear (it is a 6spd) for 1:1 ratio, on the street I do not think I tested 5th from bottom to redline...

FM clutch or somthing else ?

It is a dynapack btw

Last edited by elior77; 09-03-2016 at 10:15 AM.
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Old 09-03-2016, 04:46 PM   #7
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If it slips on the dyno it should slip on the street...normally people have the exact opposite thing happen due to the higher load on the street.
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