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slight knock when lifting off

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Old 28 March 2015, 09:00 AM
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the shreksta
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Default slight knock when lifting off

i have a slight knock when lifting off the gas pedal,

if im take the car to high revs/harsh acceleration and lift off this is when it happens,seems to be coming from underneath,its not rear shocks as they are brand new

during slow acceleration/driving its doesnt really happen (maybe once or twice)

its a blob sti with a 6 paddle clutch/lightweight flywheel

its almost as though something is settling back into place,the car goes in and out of gear without issue from cold or hot

bush/mount related perhaps?

the car is coming up to 97k

cheers
Old 28 March 2015, 09:02 AM
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ditchmyster
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It's the bottom end mate.
Old 28 March 2015, 09:03 AM
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the shreksta
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Originally Posted by ditchmyster
It's the bottom end mate.
should have bought an sti...................................
Old 28 March 2015, 09:05 AM
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Maz
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Is it coming from the rear diff?
Old 28 March 2015, 09:08 AM
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the shreksta
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Originally Posted by Maz
Is it coming from the rear diff?
its hard to tell to be honest,its like as you surge forward then lift off something goes back slightly
Old 28 March 2015, 09:23 AM
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Blue by You
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Check the bolts & bushings in the pitch mount between g/box and firewall, and the other engine mounts for that matter.
Old 28 March 2015, 09:24 AM
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the shreksta
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Originally Posted by Blue by You
Check the bolts & bushings in the pitch mount between g/box and firewall, and the other engine mounts for that matter.
will get them looked at,thanks
Old 28 March 2015, 09:39 AM
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Do you have a brake stopper fitted ?
Old 28 March 2015, 09:41 AM
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the shreksta
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Originally Posted by JDM_Stig
Do you have a brake stopper fitted ?
hi

no not at present but its something i will be fitting in the future
Old 28 March 2015, 10:00 AM
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Sounds engine mount related
Old 28 March 2015, 10:02 AM
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the shreksta
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Originally Posted by bustaMOVEs
Sounds engine mount related
will get them looked at aswell,im guessing that at over 10 years old and 97k the mounts/bushes wont be in the best condition

anybody know which are a decent replacement and where to get items like this from?

cheers
Old 28 March 2015, 10:16 AM
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bustaMOVEs
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Group n mounts and beatrush pitch mount or hard race.
They sell group n at icp.

Last edited by bustaMOVEs; 28 March 2015 at 10:18 AM.
Old 28 March 2015, 10:22 AM
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the shreksta
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Originally Posted by bustaMOVEs
Group n mounts and beatrush pitch mount or hard race.
They sell group n at icp.
ive seen the perrin pitch mount for £90 so will look at others

cheers
Old 28 March 2015, 10:26 AM
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Originally Posted by the shreksta
ive seen the perrin pitch mount for £90 so will look at others

cheers
Yeah Perrins ok too, but if you want the best then http://www.rallysportdirect.com/Beat...2-2011-WRX-STI
Old 28 March 2015, 02:31 PM
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its more likely the rear diff support, we sell loads to sort...........
Old 28 March 2015, 05:11 PM
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Originally Posted by AS Performance
its more likely the rear diff support, we sell loads to sort...........
What's the cause Alyn, breakage, loose bolts, wear & tear?
Old 28 March 2015, 05:45 PM
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I have something similar,if I give it some beans on lifting off I get a knocking underneath.If I drive like Miss Daisy nothing. It has been on a ramp but couldn't find anything loose. I might suggest rear diff support when it goes in for MOT in May.
Old 29 March 2015, 08:31 PM
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worn bushes in the T-bar
Old 29 March 2015, 08:35 PM
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Originally Posted by AS Performance
worn bushes in the T-bar
Diff?
Old 29 March 2015, 09:35 PM
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Seen this?

https://www.scoobynet.com/scoobynet-...f-the-gas.html
Old 29 March 2015, 09:42 PM
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Dave Y
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Originally Posted by AS Performance
worn bushes in the T-bar
I will get Ryan to investigate
Old 11 April 2015, 05:03 PM
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What was the outcome of this problem,did you get it sorted?
Old 17 April 2015, 06:07 PM
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Shreksta did you manage to cure this ?
Old 18 April 2015, 07:30 AM
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the shreksta
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sorry matey,my diff bushes are shot so gonna try changing them 1st
Old 18 April 2015, 08:51 AM
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ok.Mine is in for MoT in May so the noise will be investigated further I will let you know if it gets sorted.
Old 18 April 2015, 08:19 PM
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I had this on my blobeye when I throttled on and off fast it sounded a little like slack in the diff. Eventually I found the problem was the rear drive shaft nuts weren't torqued up properly. They seem to have a habit of going off torque after a few launches apparently.
Old 18 April 2015, 08:35 PM
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Originally Posted by bugeyejohn
I had this on my blobeye when I throttled on and off fast it sounded a little like slack in the diff. Eventually I found the problem was the rear drive shaft nuts weren't torqued up properly. They seem to have a habit of going off torque after a few launches apparently.
What this man said, I had the same and it was the axle nuts. I re-torqued them once and it started doing it again after 6 months so bought new ones. All is god now
Old 24 May 2015, 06:08 PM
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the shreksta
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all sorted now thanks to a new diff tie bar and group n sti bushes from rcm,will put part numbers on 2moro for all those interested
Old 24 May 2015, 07:21 PM
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my noise was the upipe knocking against the transmission tunnel.
The diff tie bar is on my to do list.
Old 24 May 2015, 07:22 PM
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the shreksta
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Originally Posted by Dave Y
my noise was the upipe knocking against the transmission tunnel.
The diff tie bar is on my to do list.
i will let you know the part numbers 2moro matey

why was the up-pipe knocking?


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