New noise since trackday
22 April 2002, 10:18 PM
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I was on a trackday yesterday and while going round suddenly got a siren sort of noise seems to coincide with boost, I have a boost gauge and everthing seems to be running allright. the noise is like the siren at the fair when a ride is about to start, a constant tone getting higher pitched as the boost goes up
23 April 2002, 08:42 PM
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What turbo, and boost are you running ? do you have a stock ecu.
Mark.
[Edited by R19KET - 4/23/2002 8:43:21 PM]
Mark.
[Edited by R19KET - 4/23/2002 8:43:21 PM]
23 April 2002, 10:19 PM
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I am just having a bit of a dispute with a garage, they fiited unichip but performance was down, the car was on the rolling road on friday. Boost was 17psi normal for unichip, the car is an sti so 17 is not outrageous
I have just been out in it, I think it seems to be getting quieter
the bhp on friday was 277 and torque 247 if this matters on the same rolling road and at the same temp it was previously a bit higher before unichip
I have just been out in it, I think it seems to be getting quieter
the bhp on friday was 277 and torque 247 if this matters on the same rolling road and at the same temp it was previously a bit higher before unichip
23 April 2002, 11:20 PM
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17psi should be fine, if it's been mapped correctly. Your figures do seem a bit low, but it would also depend on which RR it was measured on. I would be a little concerned that it was lower than standard though.
One possibility, is that the turbo overspooled on the track. This is pretty common with the Unichip, depending on the method of boost control. What method are you using.
Whilst remote, if the turbo overspools badly enough, it's possible for the compressor blades to stretch, and hit the cover. The blades will then be damaged to some degree (if it happens really badly, you wouldn't have a turbo). If the blades are damaged it would/could cause all kinds of turbulence/noise.
2nd possiblity, is that the air filter allowed some dust particles through. If this happened when the turbo was spooling at circa 150,000rpm, it would also cause damage to the blades.
However, if it seems ok now, don't worry about it too much. It maywell have settled back down.
Mark.
One possibility, is that the turbo overspooled on the track. This is pretty common with the Unichip, depending on the method of boost control. What method are you using.
Whilst remote, if the turbo overspools badly enough, it's possible for the compressor blades to stretch, and hit the cover. The blades will then be damaged to some degree (if it happens really badly, you wouldn't have a turbo). If the blades are damaged it would/could cause all kinds of turbulence/noise.
2nd possiblity, is that the air filter allowed some dust particles through. If this happened when the turbo was spooling at circa 150,000rpm, it would also cause damage to the blades.
However, if it seems ok now, don't worry about it too much. It maywell have settled back down.
Mark.
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