codie247

Can some one please describe to me what is compressor surge is? and what are the noises associated with this? I have trieda search but cant find a definative answer. when accelerating, at about 4000rpm i get this squeel for a second and then it goes. thought it mght be loose pipe , dv leaking but have checked. car is a mapped 03STi.

Cheers

Lee

silent running

It rears its ugly head in many ways, can be a chuffing, a twittering etc and can happen on full throttle, part throttle or a closed throttle. It's the sound of the compressor wheel's blades slipping on the air it's supposed to be compressing.

I get full throttle compressor surge which is a chuff-chuff-chuff noise just as I go through 4000 revs. It never lasts long, but the more boost I run, the louder it is. Working on a fix right now.

SKS

There's some good stuff from Andy Forrest (Andy.F) about compressor surge here - post 86. Whole thread makes for good reading!

Cheers,

Stewart.

500

Sounds like the turbo is on its way out Lee. Out of interest are you still using the TMIC?

Ususly a squeel when the turbine catches on the housing

codie247

oh FFS dont say that Adam , yes still on the tmic. only noticed this squeal since got it mapped. if it is the turbo, this will start a whole new side to the modding .

Lee

p.s- it only does it when giving it some and it sounds like its air escaping from a boost pipe or summat. I am going to take the intercooler off and check the pipes tomorrow. must say though it goes like stink.