Page 1 of 3 123 LastLast
Results 1 to 10 of 22

Thread: Clutch Slipping?

  1. #1
    Forum User Feedback Score 0
    Join Date
    Sep 2010
    Owner Since

    Posts
    23
    Thanks
    0
    Thanked 2 Times in 2 Posts

    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.

  2. #2
    Member verified
    supporter
    Feedback Score 0 DocWalt's Avatar
    Join Date
    Sep 2010
    Owner Since
    Oct '08 - Oct '10

    Location
    Royersford, PA
    Posts
    3,515
    Blog Entries
    1
    Thanks
    806
    Thanked 400 Times in 281 Posts
    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.
    R135
    ╚╬╬╝
    - 24

  3. #3
    Forum User Feedback Score 0
    Join Date
    Sep 2010
    Owner Since

    Posts
    23
    Thanks
    0
    Thanked 2 Times in 2 Posts
    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.

  4. #4
    Member verified
    supporter
    Feedback Score 0 DocWalt's Avatar
    Join Date
    Sep 2010
    Owner Since
    Oct '08 - Oct '10

    Location
    Royersford, PA
    Posts
    3,515
    Blog Entries
    1
    Thanks
    806
    Thanked 400 Times in 281 Posts
    Just do a pressure test while you're at it.

    Do you have any A:F controllers?

  5. #5
    Forum User Feedback Score 0
    Join Date
    Sep 2010
    Owner Since

    Posts
    23
    Thanks
    0
    Thanked 2 Times in 2 Posts
    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.

  6. #6
    Member verified
    supporter
    Feedback Score 0 DocWalt's Avatar
    Join Date
    Sep 2010
    Owner Since
    Oct '08 - Oct '10

    Location
    Royersford, PA
    Posts
    3,515
    Blog Entries
    1
    Thanks
    806
    Thanked 400 Times in 281 Posts
    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.

  7. #7
    Forum User Feedback Score 0
    Join Date
    Sep 2010
    Owner Since

    Posts
    23
    Thanks
    0
    Thanked 2 Times in 2 Posts
    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.

  8. #8
    Member verified
    supporter
    Feedback Score 0 DocWalt's Avatar
    Join Date
    Sep 2010
    Owner Since
    Oct '08 - Oct '10

    Location
    Royersford, PA
    Posts
    3,515
    Blog Entries
    1
    Thanks
    806
    Thanked 400 Times in 281 Posts
    Wideband O2 sensor. What's your setup injector wise?

  9. #9
    The one. The only. verified Feedback Score 11 (100%) stealthee's Avatar
    Join Date
    Sep 2010
    Owner Since
    August 28, 2002

    Location
    SWPA
    Posts
    3,670
    Thanks
    120
    Thanked 542 Times in 405 Posts
    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.

    [06-05, 19:29] OhioSpyderman: Brian, finding a woman is NOT the answer, you need to shop for a good VACUUM

  10. #10
    Member verified
    supporter
    Feedback Score 0 DocWalt's Avatar
    Join Date
    Sep 2010
    Owner Since
    Oct '08 - Oct '10

    Location
    Royersford, PA
    Posts
    3,515
    Blog Entries
    1
    Thanks
    806
    Thanked 400 Times in 281 Posts
    IIRC, you're right Brian. My money is still on a boost leak though.

Page 1 of 3 123 LastLast

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
3000GT / Stealth / GTO Resources
3000GT / Stealth / GTO / Multi-site Classifieds
3000GT/Stealth/GTO Event Pages
3S National Gathering
East Coast Gathering
Upper Mid-West Gathering
Blue Ridge Gathering
3000GT/Stealth/GTO Clubs and Groups
Michigan 3S
MInnesota 3S
Wisconsin 3S
Iowa, Nebraska, Kansas 3S
North California 3000GT/Stealth
United Society of 3S Owners
3000GT/Stealth/GTO Forums
3000GT/Stealth International
3000GT/Stealth/GTO Information and Resources
Team 3S
3000GT / Stealth / GTO Information
daveblack.net
The 3000GT/Stealth/GTO Web History Project
3000gt.com
3000GT / Stealth International WWWboard Archive