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Thread: Slipping clutch or Flat spot or TC??

  1. #1
    Regular Member Stu14t's Avatar
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    Default Slipping clutch or Flat spot or TC??

    Was driving to work on Friday morning and just pulled off the motorway onto the next section of motorway before I git to work. I decided, as no one was about, to give it a bit of right foot. Now this section of motorway is uphill and I noticed, as I was going up to third, a change in engine note. I glanced down at the rev counter and saw, even though foot was to the floor, the revs actually dropped back for a second from about 3k to just above 2.5k , then back up again.

    This has got me thinking a bit and would appreciate peoples thoughts.

    Is the clutch slipping or Is there a flat spot or was the traction control cutting the revs back? (road was dry)

  2. #2
    Ex Vec-C Admin ed taylor's Avatar
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    Vehicle : Vectra Estate

    Trim : Elite

    Engine : 3.2 V6

    Year : 04

    Mileage : 000

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    I don,t know for sure what the problem was. But the clutch does not sound like it id slipping and the TC would not be working under those conditions I don,t think. I hope this was some help in eliminating the cause.

  3. #3
    Regular Member Stu14t's Avatar
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    Thanks Ed,
    I may send my map to BSR and see if they can tweak it.

    Trouble is it may be unique to my car.

    I see what you are saying about the clutch. At what point does the peek torque come in on the BSR maps? I know they drop it back deliberately at lower revs. Anyone put one on a RR yet?

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    Full Member Vaux-Man-G's Avatar
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    Quote Originally Posted by Stu14t View Post
    Was driving to work on Friday morning and just pulled off the motorway onto the next section of motorway before I git to work. I decided, as no one was about, to give it a bit of right foot. Now this section of motorway is uphill and I noticed, as I was going up to third, a change in engine note. I glanced down at the rev counter and saw, even though foot was to the floor, the revs actually dropped back for a second from about 3k to just above 2.5k , then back up again.

    This has got me thinking a bit and would appreciate peoples thoughts.

    Is the clutch slipping or Is there a flat spot or was the traction control cutting the revs back? (road was dry)
    Someone I know who has a CDTI 150 too said to me they noticed a flat spot on these too. Dont know where he meant in the revs, but I recall him saying approx 3k rpm, but he said he consdiered chipping it. Dont know if its the same issue. Maybe same thing?


    Bye bye Vec B
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  5. #5
    Regular Member Gsi3.2's Avatar
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    if the clutch was slipping the revs would rise not fall, as the engines torque overcame the drag of the car/hill/gearbox.. so if they dipped you can safely say it's not the clutch 100%..

    i favour a momentary 'blip' in the cars ECU.. sort of a brain fart moment if you like.... TC wouldn't cut in on a dry road, not even in a diesel .. ( not an anti deisel comment, i did used to own a CDTi ) so it's more a management issue.. is it the BSR?, I don't think so..a faultcode session would prob reveal a momentary sensor fault that held the RPM back

  6. #6
    Regular Member Stu14t's Avatar
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    Tried it again this morning but didn't give it so much boot. There is a distinct flat spot at about 3k.

    When I did it today there was a distinct pause before the revs picked up.

    She is in for a service in about 2k miles, I'll mention it to them then to see if anything shows up.

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