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Thread: Throttle control

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    Default Throttle control

    OK so its only a 1.8 VVT Design, but I like it, apart from the way the throttle works. She/He/It (PC) wont be hurried through the gears.

    When ever I lift to change gear and depress the accelerator the revs climb 500rpm before falling away and if I change gear too quickly the clutch snatches and car lurches. Is it really my timing.... I drive a number of different cars and the gearchanges are smooth and as quick as I like in those.

    I know there is a lag in the electronic throttle system but it should react like this, is there a different mapping for the ECU that can be applied. I have checked with the garage and had the car serviced, but no help.

    Anyone got any ideas.

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    Regular Member Ste's Avatar
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    Default

    It's not really 'lag' in the electronics, but an intentional feature to make driving smoother, as the throttle effectively is damped to 'smooth' out rapid throttle changes. Sportier model calibrations may have reduced dampening to improve responsiveness to throttle position, BUT rapid lift off throttle snap can lead to over steer conditions, not good in most cases.

    In other words, it's not really a fault - so the VX monkey won't know / have the ability or equipment to change it, as they can't modify calibrations.

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    Regular Member 900ss's Avatar
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    Mines the same m8, I think its a case of its how they are.
    Bring back carbs I say

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    Default

    Ste;815407

    OK so not really lag and I understand the theory on throttle dampening, Ford uses it with great effect in the Focus, BUT when lifting off the throttle to change gear the revs shouldnt rise 500rpm hold for split second before falling away. I think Ford have figured out that if the clutch is depressed then the "smoothing" effect is cancelled allowing the revs to drop away ready for pick up when the clutch is re-engaged. I cant help feeling there is a sensor somewhere thats not working properly, but then with the Canbus that would show on the diagnostics.

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    Default

    I don't know if the clutch switch has a fed into the ECM, but you can try it and see if it works by pressing acc, then slightly pressing clutch - but not enough to cause slip. The engine should derate to zero throttle - well mine does anyway.

    As the Vec was designed as a motorway cruiser, I would have thought that the throttle dampening would be fairly aggressive to make it a smoother ride.

    Mine does it too, how long have you had the car? It could just be a timing issue of lifting off and going on clutch. Maybe you'll get used to it's little furbells.

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