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Is my clutch slipping?

Old 06-10-2008, 01:07 AM
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Default Is my clutch slipping?

So, i asked this in my dyno thread but got no answer. I dont normally like to make pointless threads but i am looking for some insight. Take a look at my dyno graph, notice how the torque goes to ****. This was after like 4-5 pulls. I know it's not supposed to look that choppy, the guy at the dyno said that it might be spark blow out. My plugs are gapped to .25.

Could it be my clutch slipping?

It seems like a logical explanation to me. I mean, the first graph doesnt dive like this one. Also, i was running 14psi and i should have been making more power.

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Old 06-10-2008, 08:35 AM
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Just my .02, but if your clutch were slipping, I'd suspect the torque curve would be flat once you reach the threshold torque for slip. IE your peak torque is 213ft*lb, so it should stay near that value once things start slipping.

It's easy to test a slipping clutch, though. Just get on an empty road, get near your torque peak RPM, floor it and modulate the brake to hold the SPEED steady. Then watch your RPM to see if it climbs as speed is steady. If it does, your clutch is slipping.
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Old 06-10-2008, 08:43 AM
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if your clutch was slipping, you would know instantly, and your dyno would look like this once you left off and it caught again:
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Old 06-10-2008, 09:16 AM
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I see, i didnt know if it was possible for the clutch to be slipping just a bit and not make the rpm's shoot up. I have seen the clutch slip badly a couple of times, usually, if it does it, it is at the top of 4th..
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