Howling Turbos - sounds like a blues singer!

[merlyn]

Can anyone help
just changed the old induction to apexi\'s and hand pipes all the way - what a difference!
BUT
the turbos howl at cruising - not foot down when they whine and breath just fine but am worried might damage them in the long run (and force me to go single!)
Pete

[merlyn]

Guess that\'s a \'don\'t know\' then

[CraigN]

whats the "howling like"

normal suction type noise or "screeching type" I had a T3 turbo once that made a horrendous noise, turned out it had screwed bearings and the shaft had become unbalance leading to compressors touching ths housing. Thus causing the awful noise.

[skybusr34]

i had a vw passat 20v turbo 1.8 petrol , turbo howlwd on that. turned out the oil pump was on its way out and wasn`t pumping oil to turbo. fried bearings

[merlyn]

none of this sounds very promising ... but thanks for the info

the howling sounds like someone blowing over a very large, and loud, bottle - there is no grinding to it and directly you spool up the turbo properly everyone sound sweet - no screetching or anything. i haven\'t touched the turbos themselves and thought it might just be the hardpipes but then again I can hear the turbos better so presumaby i would be able to here any problems beter too.

any ideas as to how i can work out whats wrong - other than taking the whole funking thing apart that is.

[ro284]

Merlyn could it be the air pump mooing?
Bob

[merlyn]

Merlyn could it be the air pump mooing?
Bob

don\'t know - didn\'t notice it before the hardpipes

only happens at boosts of minus 0.2 to plus 0.2 bar - i thought it might be the wastegate

[ro284]

A quick test would be to unplug the air pump and drive the car. at least that would eliminate that possibility, whaen i fitted Apexi intake, i found it was the air pump mooing because it\'s not connected to the filter box,
Bob

[merlyn]

A quick test would be to unplug the air pump and drive the car. at least that would eliminate that possibility, whaen i fitted Apexi intake, i found it was the air pump mooing because it\'s not connected to the filter box,
Bob

Thanks - will try that at the weekend

[yamaster]

Thanks - will try that at the weekend

sounds like the air pump noise. drive it slowly in first and rev it up at aroud 2500rpm it sound shut off.

i thought the same when i fitted my filters

[merlyn]

sounds like the air pump noise. drive it slowly in first and rev it up at aroud 2500rpm it sound shut off.

i thought the same when i fitted my filters

that\'s exactly what happens - thanks guys
i guess to cure it i will just have to decat and remove the air pump
never mind eh?

cheers