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Mazda Rotary Club

General => General Technical => Anything Engine/Performance/Tuning related => Topic started by: merlyn on February 06, 2007, 01:30:34 PM

Title: Howling Turbos - sounds like a blues singer!
Post by: merlyn on February 06, 2007, 01:30:34 PM
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
Title: Howling Turbos - sounds like a blues singer!
Post by: merlyn on February 07, 2007, 12:46:34 PM
Guess that\'s a \'don\'t know\' then
Title: Howling Turbos - sounds like a blues singer!
Post by: CraigN on February 07, 2007, 01:34:34 PM
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.
Title: Howling Turbos - sounds like a blues singer!
Post by: skybusr34 on February 07, 2007, 03:46:41 PM
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
Title: Howling Turbos - sounds like a blues singer!
Post by: merlyn on February 07, 2007, 09:21:00 PM
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.
Title: Howling Turbos - sounds like a blues singer!
Post by: ro284 on February 07, 2007, 09:55:44 PM
Merlyn could it be the air pump mooing?
Bob
Title: Howling Turbos - sounds like a blues singer!
Post by: merlyn on February 07, 2007, 10:09:14 PM
Quote from: ro284Merlyn 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
Title: Howling Turbos - sounds like a blues singer!
Post by: ro284 on February 07, 2007, 10:13:54 PM
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
Title: Howling Turbos - sounds like a blues singer!
Post by: merlyn on February 08, 2007, 03:00:29 PM
Quote from: ro284A 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
Title: Howling Turbos - sounds like a blues singer!
Post by: yamaster on February 08, 2007, 11:16:44 PM
Quote from: merlynThanks - 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
Title: Howling Turbos - sounds like a blues singer!
Post by: merlyn on February 09, 2007, 09:47:29 AM
Quote from: yamastersounds 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
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