Severe juddering on liftoff
13 June 2012, 01:13 PM
#1
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Severe juddering on liftoff
Hi,I have a 07 WRX (PPP) + Re-map. When I lift my foot off the accellerator (quickly) at 4500+ rpm the car judders/jerks. This happens in 1st, 2nd or 3rd and it seems to be getting worse over time. Below 4200 rpm nice gentle de-cellaration.Any ideas?Cheers
15 June 2012, 01:06 PM
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Had a look and the mounts appear fine, plus it doesn't jerk at 4200 rpm liftoff. Also found that it doesn't always do it, just most times.
Cheers
Cheers
15 June 2012, 05:12 PM
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15 June 2012, 05:13 PM
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I will check the clutch out. Second/third gear pull off etc.
thanks for the suggestions
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15 June 2012, 05:36 PM
#8
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Large gaps in the fore/aft position could cause engine judder/movement.
Minimal gaps.........
15 June 2012, 06:52 PM
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I dont know how to test them mate, the reason I was asking is because when I had one fitted I was gettin the same symptoms as you. Didnt think a dump valve would do that but it did. Took it off abd reduced considerably, then had some whiteline gearbox bushes fitted and gear change is quite smooth, and when lifting off the throttle its not as jerky.
15 June 2012, 07:43 PM
#10
Does it do it when you release the clutch pedal or just backing off the throttle? Does it seem like the engine causing it or is it vibrating through the whole car? Could be clutch judder or rear diff mounts shot.
Last edited by Badger_88; 15 June 2012 at 07:50 PM.
15 June 2012, 07:59 PM
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15 June 2012, 08:01 PM
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