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High rpm jerking ect


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#1 pe4805

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Posted 28 October 2010 - 9:07 AM

Hey guys, I've noticed now that a couple of subaru's I know, and some I have heard about,
have been allgood to drive normally but when boosting and at 4-5k rpm+ they start jerking like crazy and making loud spluttering noises :S
Would love to hear from anyone with similar experiences/ knows what it is or how to fix it, cheers guys.
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#2 madmike

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Posted 28 October 2010 - 9:19 AM

Hey guys, I've noticed now that a couple of subaru's I know, and some I have heard about,
have been allgood to drive normally but when boosting and at 4-5k rpm+ they start jerking like crazy and making loud spluttering noises :S
Would love to hear from anyone with similar experiences/ knows what it is or how to fix it, cheers guys.


Could be any number of things dude..
coils,plugs,fuel pump,igniter,boostcut................
Give us a bit more info on the car.

Here is mine on the dyno with soft valve springs.
My miss starts at 6000rpm when the car is coolish.. and drops to 5700rpm when stinking hot..
http://www.facebook....v=1585641995335
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#3 pe4805

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Posted 28 October 2010 - 9:22 AM

Yea thats pretty much exactly it, the car i got in mind right now is a 94 second gen manual twin turbo, algood redlining in 1st and second but 3rd, 4th and 5th at 5-6krpm its starts, lower rpms for higher gears.
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#4 madmike

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Posted 28 October 2010 - 9:27 AM

Yea thats pretty much exactly it, the car i got in mind right now is a 94 second gen manual twin turbo, algood redlining in 1st and second but 3rd, 4th and 5th at 5-6krpm its starts, lower rpms for higher gears.



Sounds like yours is more boost related dude..

Mine will do it in all gears and all boost levels..
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#5 pe4805

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Posted 28 October 2010 - 9:29 AM

Hmm yea, this one's got aftermarket bov and wastegate
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#6 Wiretap

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Posted 28 October 2010 - 10:43 PM

Hmm yea, this one's got aftermarket bov and wastegate


There's ya problem....... a modified TT...
[20:30:58] <Pelvin> what are the handbrake shoes? are they only fitted on the rear?

#7 boostin

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Posted 29 October 2010 - 4:12 AM


Hmm yea, this one's got aftermarket bov and wastegate


There's ya problem....... a modified TT...


Run away. Fast!
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#8 pe4805

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Posted 29 October 2010 - 6:06 AM

hahah okay okay, but any info on how to fix it? just as a bit of trivia haha
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#9 Wiretap

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Posted 29 October 2010 - 6:19 AM

yep, buy something else...
[20:30:58] <Pelvin> what are the handbrake shoes? are they only fitted on the rear?

#10 boostin

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Posted 29 October 2010 - 6:44 AM

It all depends on the cause. Overboost cut is caused by the wastegate not opening enough, misfires are bad spark plugs or coils, detonation from a failing fuel pump....
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6 stars, 6 cylinder and 6 speed. 666. It's the devil car!!




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