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Thread: Clutch Slipping?

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    Question Clutch Slipping?

    I posted this on my local forum, but I'll post this here too.

    Quick question. My car and clutch work just fine below 4000 RPMs. However, if I get in 2nd gear and take off, at some point over 4k-5k I can feel what I think is the clutch slipping. Now, just to let you know, I am not hitting the throttle at 100%, more like maybe 50% when taking off. I go up to around 15 lbs boost as I accellerate, but the boost backs off by the time I hit the 4k-5k RPMs (because I am backing off the gas), so it is all natural engine at the high RPMs, and yet it still feels like the clutch is slipping (by slipping I mean I feel stuttering).

    Is this a normal indication of slippage? Or could there be something else wrong? I figured the clutch would be more likely to slip at the lower RPMs where I'm putting a much higher degree of torque on it.

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    Put the car in top gear at low RPMs and got WOT. You'll know if it slips if your revs jump up and the car doesn't go faster.

    Stuttering generally isn't a sign of a slipping clutch, especially under those conditions. It sounds like a boost leak, or something.
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    Quote Originally Posted by DocWalt View Post
    Put the car in top gear at low RPMs and got WOT. You'll know if it slips if your revs jump up and the car doesn't go faster.

    Stuttering generally isn't a sign of a slipping clutch, especially under those conditions. It sounds like a boost leak, or something.
    I'll try what you said in the morning. But like I mentioned, I am not boosting at the higher RPM, so I doubt it's a boost leak. Maybe a fuel management problem? Maybe my caps are going bad in the ECU. I've never had it opened since I bought the car 2 years ago.

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    Just do a pressure test while you're at it.

    Do you have any A:F controllers?

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    Quote Originally Posted by DocWalt View Post
    Just do a pressure test while you're at it.

    Do you have any A:F controllers?
    Oh yes. I have a S-AFC. My tune is good, at least it was.

    The car ran like a champ at NG09. I did not have this problem on the drag or autoX (didn't do road course). If you were there, you may remember the car. It looks like VR440's but the silver stripes are wider, and it still has a V6 lol.

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    Do you have a wideband? If so, what does it do when the stuttering is happening? If it's bad enough, it may be noticeable in a regular log as well.

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    Quote Originally Posted by DocWalt View Post
    Do you have a wideband? If so, what does it do when the stuttering is happening? If it's bad enough, it may be noticeable in a regular log as well.
    Wideband? It's been so long since I did any of that reading, that I honestly can't remember. Isn't wideband required for speed density? If so, I don't think I have that setup. My SAFC is set to show throttle, correction, RPM, and knock. None of which I remember looking out of the ordinary. On the other hand, I'm not entirely sure exactly what the correction values are supposed to be for this tune, but I think they have not changed.

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    Wideband O2 sensor. What's your setup injector wise?

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    Clutch slippage usually only happens in higher gears. One thing to check is the pedal engagement. On a TT I beleive its .5-.8 inches. I would need to verify that though.

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    IIRC, you're right Brian. My money is still on a boost leak though.

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