Full decat, odd noise????
01 March 2005, 09:58 PM
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Full decat, odd noise????
I replaced all 3 cats today with H&S soild up pipe, Scooby sport downpipe and centre. The car goes like stink, and stinks due to the zorst wrap 
, but i am getting a very odd noise when the turbo kicks in. It very hard to describe, almost like an induction/sucking noise, but almost like a very high frequency rattle or a whirring noise. I have put a bolt in the up pipe EGT sensor hole to block it off as i don't want this to break up and go into the turbo, it maybe coming from there. I decatted my last wrx from turbo back (left in up pipe), so i know what that sounds like but didn't expect this, is it just because i can here the turbo more, or is it a leak/blow/rattle??
Anyone??
, but i am getting a very odd noise when the turbo kicks in. It very hard to describe, almost like an induction/sucking noise, but almost like a very high frequency rattle or a whirring noise. I have put a bolt in the up pipe EGT sensor hole to block it off as i don't want this to break up and go into the turbo, it maybe coming from there. I decatted my last wrx from turbo back (left in up pipe), so i know what that sounds like but didn't expect this, is it just because i can here the turbo more, or is it a leak/blow/rattle??Anyone??
01 March 2005, 10:22 PM
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Originally Posted by RON
Could it be the wastegate??? Mines kinda rattles like that, scared me half to death at first… not any more though!!!
Maybe, did yours only start doing it after you decated?? Have you got a full decat??
01 March 2005, 10:24 PM
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Originally Posted by dyllan
i think i got the same noise i decatted mine last weekend and got like a rotational rattle noise
)
01 March 2005, 10:25 PM
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austen,
To check for leaks start the car and get a mate to put some thing over the end of the exhaust temporary to create back pressure and get under the car and check the joints you will soon see if you have a leak,when I decatted mine I noticed more wastgate chatter.
To check for leaks start the car and get a mate to put some thing over the end of the exhaust temporary to create back pressure and get under the car and check the joints you will soon see if you have a leak,when I decatted mine I noticed more wastgate chatter.
01 March 2005, 10:26 PM
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I'm Sure it’s the wastegate, the ecu send s a very quick pulsing action to open it once you reach full boost,, so it tends to rattle, especially seeing as you’ve done away will all the sound deadening on the exhaust……ignore and enjoy….. are you gonna get it mapped to suit the decat??
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01 March 2005, 10:28 PM
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Originally Posted by gussy
austen,
To check for leaks start the car and get a mate to put some thing over the end of the exhaust temporary to create back pressure and get under the car and check the joints you will soon see if you have a leak,when I decatted mine I noticed more wastgate chatter.
To check for leaks start the car and get a mate to put some thing over the end of the exhaust temporary to create back pressure and get under the car and check the joints you will soon see if you have a leak,when I decatted mine I noticed more wastgate chatter.
Do you get the chatter during hard acceleration?? its almost like some has fitted spokey dokeys (remember them
) to the turbo!!
01 March 2005, 10:30 PM
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Originally Posted by RON
I'm Sure it’s the wastegate, the ecu send s a very quick pulsing action to open it once you reach full boost,, so it tends to rattle, especially seeing as you’ve done away will all the sound deadening on the exhaust……ignore and enjoy….. are you gonna get it mapped to suit the decat??
Booking it in for remap in march some time
03 March 2005, 08:07 AM
#10
It is the lack of sound deadening and also the resonating of the stainless downpipe (Stainless can 'ring' alot more then mild steel).
If you wrap it in heat wrap it will get rid of most of the noises.
Although mine has started doing it again, after 12 months. But it's only noticable when the exhaust is fairly cold. Once it warms through it's quiet again.
I've put this down to the heatwrap going a bit hard at the top of the DP, due to the excesive heat near the turbo. The wrap is alot softer at the bottom of the DP where it's cooler.
If you wrap it in heat wrap it will get rid of most of the noises.
Although mine has started doing it again, after 12 months. But it's only noticable when the exhaust is fairly cold. Once it warms through it's quiet again.
I've put this down to the heatwrap going a bit hard at the top of the DP, due to the excesive heat near the turbo. The wrap is alot softer at the bottom of the DP where it's cooler.
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