A question about turbo noises.

[Tom]

Why is it that when a petrol turbo revs it goes bwarp chu chu chu yano that epic noise i cant make. But a diesel just whistles if we're lucky or maybe sneezes when you load it up? I know some of the vnt diesels make epic noises but not like a petrol.

Im guessing its to do with the throttle butterfly shutting?

[Craigus]

Wastegate chatter?

[Piggy]

Nope.

Mine chatters n chuffs n pwooshes

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Ill try n get a video sorted for noises

[Jenkosowls]

You mean compresser stall it's because pervs have a throttle body the turbo compressors the air against it and it has no where to go so it flows back and stalls the compressor wheel creating the noise. Hence why pervs have recirc/bovs

[Tom]

^^ Thats bang on what i thought it was.

[Dum-Dum]

You can make epic compressor stall noises on a diesel but compressor stall is a turbo killer.

Wastage chatter is a myth and is usually compressor stall.

[4WayDiablo]

www.youtube.com/watch?v=6jzUFdUc8nY&feature=youtube_gdata_player

[mikey b]

If you run unfiltered onto the turbo ( silly thing to do but sounds good ) they will do it if your going along hard and put ya foot on clutch hard but don't do ya turbo much good

[Piggy]

I'll sort a video today if I can to show GT20 epic chatter

[Ruan]

Waste gates don't make any noise at all other than when they open the engine just gets much louder...

It's the throttle plate shutting that causes that noise... It's not a good noise by any means, it's the sound of the compressor flow becoming Un stable and forcing itself ways it doesn't want to go because the compressor is spinning too slowly to support the pressure created and airflow demanded...

[Piggy]

so as I aint got a throttle plate...whats all me noises!?

[Ruan]

As said, compressor spinning too slow for the amount of pressure produced and air demanded. This is the problem with turbos that are very efficient, they move so much air at low engine speeds and spin up so fast, that as soon as the exhaust gas flow slows, it instantly causes it to begin to surge..

The biggest problem lies when those noises happen on the throttle, that's because it's making so much air, even with the exhaust flow, there's no way it'll stay stable, so then starts making horrible noises... A lot of pressure is placed on the compressor shaft when it happens, combined with the exhaust gas spinning the turbine, it's a situation for snapping turbine shafts... It's like the compressor trying to do one thing, and the turbine doing another...

[Piggy]

sounds like I need a bigger turbo

its only when throttling off I get the choo choo sounds.

Just a lot of WOOOOSH when Im accelerating

[Piggy]

sorry about the poor position of me camera...insulation taped me phone to me rear view!

[Chris_90]

Are you de-filtered piggy? Looks like that goes extremely well! Think more boost your gonna take off

[Piggy]

Are you de-filtered piggy? Looks like that goes extremely well! Think more boost your gonna take off

Nope. Gearbox mounted turbo with about a 400mm pipe to 'cross filter mounted almost behind passenger headlamp

Only at 1.3bar...lots to go yet

[Chris_90]

Are you de-filtered piggy? Looks like that goes extremely well! Think more boost your gonna take off

Nope. Gearbox mounted turbo with about a 400mm pipe to 'cross filter mounted almost behind passenger headlamp

Only at 1.3bar...lots to go yet

What's that in a propa measurement? (psi)

[Dicky]

Are you de-filtered piggy? Looks like that goes extremely well! Think more boost your gonna take off

Nope. Gearbox mounted turbo with about a 400mm pipe to 'cross filter mounted almost behind passenger headlamp

Only at 1.3bar...lots to go yet

What's that in a propa measurement? (psi)

I think 1.3 bar is like 18psi?

[Tom]

Around that yeah ^^

Mine actually made a choo choo noise earlier. I didnt here it the gopro did. And it wasnt even full boost just a gentle pull away into second and goes chooooo.

[Chris_90]

All these choooo'ing sounds are the sounds of turbos slowly killing them self's

18psi wouldn't have thought there's much more in the gt2056? Maybe 22psi

[Anton]

My 2052 is pretty sweet at 24-26psi

[anto]

My little gt15 did it at 30+psi. Not healthy at all, but sounded class.

[Chris_90]

My 2052 is pretty sweet at 24-26psi

Oooo thought they started to shit there self's over 25psi.... You had yours dynoed Anton?

[padge]

http://s112.photobucket.com/user/w1n_200...8.mp4.html

[Piggy]

My little gt15 did it at 30+psi. Not healthy at all, but sounded class.

Little older turbos can manage that but they aint moving any more air over 25psi....just making heat

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My 2052 is pretty sweet at 24-26psi

Thats my aim...about 24psi

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And do remember the GT2052 and 56 's' are both very efficient and move a lot more air at low psi that a t2 or gt15 would ever provide even at twice the psi

[Chris_90]

http://s112.photobucket.com/user/w1n_200...8.mp4.html

What car/turbo was that?

[padge]

my old xud, T2 @ 28psi de-filter.

[Piggy]

My old t2 made funky noises...didnt last long tho

[Sambarker]

Mine did as soon as is fitted a fmic. Wachacha when coming off boost in 4th

[Tom]

Runs to ebay to buy a gt series


Thanks Piggy appreciate those vids mate you can really here it!