[Mk2] [Turbo] boost leak?

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mr2barri
Posts: 67
Joined: Fri Aug 27, 2010 6:32 pm
Location: hull,east yorkshire

[Mk2] [Turbo] boost leak?

Post by mr2barri »

hi guys iv got a rev3 tubby with manual boost controller,air filter,full exhaust system

its set to 0.9 bar of boost but when i have the car at full throttle it holds 0.9 for about a second then it slowly drops off to about 0.4 bar im assuming i gotta boost leak so were do i start
swaggansway

Re: [Mk2] [Turbo] boost leak?

Post by swaggansway »

u should here it hissing....check all ya clips on pipes etc. it should be obvious where it is. then inspect ya intercooler for damage
Razor04
Posts: 2560
Joined: Mon Jun 09, 2008 4:25 pm

Re: [Mk2] [Turbo] boost leak?

Post by Razor04 »

I have the same problem at the moment holds 1 bar for a second then drops off.

don't know what it is, doesn't seem to be a leak anywhere I'm thinkin it's the manual boost controller :-k
2tmike
Posts: 435
Joined: Mon Nov 06, 2006 6:39 pm

boost leak

Post by 2tmike »

I guess either a leak...which this much you should hear, or, for whatever reason the ecu's cutting the boost, or the wastegate's not holding mechanically? Rev2's have a safety boost level of about .4bar if the ecu doesn't like something, (for eg low outside temperature) but I don't know about rev3
djpkins
Posts: 2326
Joined: Thu Apr 30, 2009 7:13 am
Location: essex

Re: [Mk2] [Turbo] boost leak?

Post by djpkins »

It's worth taking the hoses off and inspecting them...some of mine were splitting and de-laminating, but you couldn't see that untill you had them in your hands and squished them up a bit...particularly the hard to get to one at the back of the IC as it's right over the downpipe...after replacing all the hoses and clips (stainless jubes are about £1.50 each and £8 for 250mm of silicone hose)...I sealed all the joints with a smear of high temp silicone...made a big difference on and off boost, bov is more active and responsive...all in for £20.
As yours is rev2, I would also remove and inspect the AFM, which also gives you the opportunity to check the turbo and have a sketch around that part of the engine.
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