Strange Noise

[Adam Kindness]

At around 3000rpm a noise pops up... sounds like an airleak or similar

Its not the whistling/spining of the turbos!

Ive checked to hoses, there on :) there doesnt 'seem' to be any powerloss... any ideas

[Alex]

Faulty BOV or wastegate????

[Branners]

are you still running the stock airbox?

JB

[Adam Kindness]

yes. the whole engine is standard (to look at anyway).....

Is there anyway of easily checking these probs

[Alex]

You could, take off the bonnet, strap your self down over the engine bay and get a mate to thrash the car around town???? ;)

(Edited by Alex Holdroyd at 5:36 pm on Feb. 18, 2002)

[Adam Kindness]

another wee note... only happens in gear too

[Phil Wall]

Is the noise there as you pass through 3000 or just if you hold revs at 3000?

[Adam Kindness]

its constant from above (aprox) 3000rpm

[GavinL]

is it a UK car ?

[Adam Kindness]

nope, so not EGR

94 jap import Auto twinturbo

[Ian C]

Quote: from Adam Kindness on 12:53 am on Feb. 19, 2002[br]another wee note... only happens in gear too


If it's only above 3000rpm and only in gear, and only in 3rd and above, it must be 'engine whilst under load' related.  3000rpm is just when the prespooling of #2 turbo starts, so maybe the EGBV vacuum line is split?

You wouldn't notice a power loss from this, but you may notice a more pronounced transition to the second turbo...

-Ian

[Adam Kindness]

its in all gears... dont think id hear it at 3000rpm in 3rd... as you only hear it when the windows are down....

Where's this vacuum pipe located, so i can give a quick check?

EGBV - exhaust gas ??? valve (blowoff?)

cheers for all the help tho :)

[eyefi]

is it a sort of fluttering sound, sort of like an air leak stopping and starting again very quickly. if it is i have this noise too & i think its the gearbox, im not sure if its a normal sound but im due for an investigation soon (fluid change etc) b4 my warranty expires.

i only realy hear this noise when going past walls with windows down.

[Ian C]

Quote: from Adam Kindness on 1:32 pm on Feb. 19, 2002[br]its in all gears... dont think id hear it at 3000rpm in 3rd... as you only hear it when the windows are down....

Where's this vacuum pipe located, so i can give a quick check?

EGBV - exhaust gas ??? valve (blowoff?)

cheers for all the help tho :)


Exhaust Gas Bypass Valve.  It's actualtor looks a bit like a wastegate actuator, and it's slung under the #2 turbo.  This means it's an absolute arse to get to...  At the back of the engine, coming off #2 turbo, you have the induction pipe post-compressor.  This has a boxy bit on it with a VSV attached, and that's your Intake Air Control Valve.  under that, bolted onto the #2 turbo, is the EGBV.

I need a good picture of the engine bay to point it out...  Any about?  

Regarding the noise, you would probably hear it in all gears, dunno where I got the idea that it was only in 3rd upwards...

-Ian

[Adam Kindness]

Still aint none the wiser!

I think all the powers still there... cant realy test it in edinburgh city centre!

BUT - do you think it'l be wise to give the 1/4 mile sstrip a miss on sunday

[Adam Kindness]

for engine pics see http://www.csdevelopments.com/supra

[Martin F]

Adam i can't remember whether you have a boost controller in your car or not.

But looking at your engine bay pics, it would look like it's had one in at some point as one of the wastegate\associated VSV hoses has been replaced and has no clip on it.

The lack of a clip is not too worrying in itself, although you should replace it at some point, but IMHO you should check around this area and make sure all the plumbing is correct.

Now this is not going to be easy, because it is quite a complex system. My best suggestion would be to meet up with another Supra owner and visually compare the systems.

The pipe in question is one of the two at the front of the turbo's that goes down through a protective sleeve and to the vsv or possibly direct to the wastegate, can't remember exactly where it goes without looking it up..... :)

I'm not saying this is the source of your noise, but it's worth checking.