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Thread: very little low end grunt

  1. #1
    Regular Member cheekylemon's Avatar
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    Default very little low end grunt

    Hey all.

    Maybe a daft question: AFAIK diesels are meant to be quite grunty and torquey (power, not the town!) low down the revs, but mine seems to go now where, and then BANG the turbo is in and away you go.

    Other than a filter change (which is probably needed) and a remap is there anything I can do to improve this? Seems a bit dead when pull away.

    I have done the airbox mod by the way.

    Cheers all.

    EDIT: I probably should have put this in the technical/troubleshooting section??

    Rich
    Last edited by cheekylemon; 15th January 2008 at 23:06. Reason: possible wrong board

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    go to vauxhall and tell them there is a very big flat spot below 2000 rpm you may find they will rework your software for free

    the flat spot is on the lists of fault

  3. #3
    Regular Member cheekylemon's Avatar
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    Quote Originally Posted by chrisgettings View Post
    go to vauxhall and tell them there is a very big flat spot below 2000 rpm you may find they will rework your software for free

    the flat spot is on the lists of fault
    Ahh, I never knew that. I wouldn't have thought they would do it for free would they?

    I also forgot to say, its the 1.9 CDTi 150.

    Worth a shot tho, I will give them a bell tomorrow. Cheers.

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    Regular Member m8internet's Avatar
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    Turbo diesel power band is just above where the turbo activates
    As you have quite rightly found, it is about 2000rpm
    It's the same on the 3.0 V6 CDTI
    You can be in a high gear and low revs, put your foot down and start reading a book...
    However, once the revs get the magic 2000rpm it is a different story!

    Normally aspirated diesel power band is just below this, as there is no turbo

  5. #5
    Regular Member cheekylemon's Avatar
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    So I need to be giving it more revs when taking off then?

    Out of interest, at what revs do the diesel boys change gear? Bit of daft Q, but hey, there we go

    I normally change just short of 2k, maybe I should use more of the range?

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    you may find reving the car abit more will sort the flat spot out the

    try changing above 2500rpm up as high as 4500rpm to get the full power of the car

  7. #7
    Regular Member Danwells72's Avatar
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    Vehicle : Vectra

    Trim : Sri

    Engine : 1.9 cdti 150

    Year : 2004

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    I normally change at 2500 rpm, if im being fuel concious i will change just over 2000.

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    Regular Member Karl's Avatar
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    I change around the 3-3.5k mark, means its always in the power band. But then mine is a 120 and it has NO power above 3.5k or below 2k

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    Regular Member Stuarty's Avatar
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    I think its just the way they are mate when i test drove mine i pulled out on to a roundabout and almost got t boned and i had loads of room when i pulled out there was just no power until the turbo started to spool just wasnt used to the diesel engine but once you get used to it its not a problem

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    Regular Member Karl's Avatar
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    oh, and if you are changing at 2k your car really aint ever getting into its stride. Your turbo doesn't really come fully on boost until 2-2.2k (though starts at around 1800rpm

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