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Thread: Overrevving when changing gear

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    confused Overrevving when changing gear

    I have just aquired a 2006 Vectra 1.8 VVT and have noticed some strange goings on when changing gear especially in 1st & 2nd gear changes. When I change from 1st to 2nd, I plant my foot on the clutch and take my foot off the accelerator. This strangely causes the revs to climb. To make smooth gear change, I have to wait for the revs to drop after a short period of time then continue otherwise it sounds and feels as though I'm revving too high. This makes quick gear changes noisey and out of the question unless you want to sound like you cannot drive. Is this common behavior for a Vectra and maybe this engine inparticular or do I have a engine management problem?

    I've also noticed that when dropping gear to go downhill, the engine doesn't give much resistance and more braking is needed and tends to run away. Is the Vauxhall's attempt to keep revs high for economy purposes?

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    Regular Member Gsi3.2's Avatar
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    it actually sounds like they've increased the weight of the flywheel.. that'd cause it to overrev if you dip the clutch..

    it's not something i've come across.. even in the VVT i had as a loaner.. you did have to rev it though.it was deffo a car for 'relaxed' gear changing.

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    Tried some more tinkering around today and I think I've spotted a problem. When I accelerate there's a delay between putting your foot on the accelerator and getting any response from the engine (about half a second) and I think this is what is happening when I take my foot off, there is a delay on the engine response thus causing the overreving when I hit the clutch.

    Does anyone else have any noticeable delay when they press the accelerator? Maybe time to drop it in at Vauxhall.

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    Regular Member Gsi3.2's Avatar
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    they will tell you it's a function of the software... it's not a performance car, so, like the new corsa etc, there is a delay in 'response' from the engine..

    It'll just be slower gear changes for you i'm afraid..

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    same on my 06 plate design VVT mate, its normal, if im going for it i try and shift at just gone 6100rpm as not the hit the limiter as the gearbox just bogs down and wont shift

    Jon

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    I've noticed this slight delay in every vauxhall I've owned (they have all been drive by wire) ... I've just got used to it to be honest ... you notice it more when accelerating hard and then dip the clutch to change ... the revs shoot up noticebly before dropping off.

    Dave

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    Ex Vec-C Admin & Founder Bainie's Avatar
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    I have had this on the VXR, I was going to put a post up about it, noticed it when the wife was driving and gave her a bolliking for it, then when i took the car out it happened to me as well, just at very low revs, climbs about 100rpm as soon as you put the clutch in, then the revs die away, very frustrating ...

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    Quote Originally Posted by Bainie View Post
    I have had this on the VXR, I was going to put a post up about it, noticed it when the wife was driving and gave her a bolliking for it, then when i took the car out it happened to me as well, just at very low revs, climbs about 100rpm as soon as you put the clutch in, then the revs die away, very frustrating ...
    Although I think in some ways when hamering up the gears it can be quite a good thing as it helps sync the gears better and keep the car 'pert and ready for the power'. That's what I told myself to live with it anyway!

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    Quote Originally Posted by ukanalyst View Post
    Although I think in some ways when hamering up the gears it can be quite a good thing as it helps sync the gears better and keep the car 'pert and ready for the power'. That's what I told myself to live with it anyway!

    Forgot to add on me last post, the wife had filled the car with normal petrol because " she didn`t think you would notice" only confessed when i noticed it doing it as well, a couple of tanks of V-power and it has settled down again ...

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    Hi to u all, this thread might be spent now but it did take my interest because i have the 1.9 cdti 150 and when trying to welly it in 1st & 2nd it feels like there is back lash in the drive train, i have learn't to release the gas peddal a few seconds early'er than normal, i have just plopped a K&N filter in to which now i have fitted properly ( with the box mod ) the revs are comming down alot quicker ! much better gear changes to. cheers Kcs

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