Gu 03 zd30 engine lag

[Glennloo]

Hi all I'm getting an engine lag at around 80km once release foot pedal it ok still seems like lacks a bit of power up slight hills and notice it does choof out dark smoke under lag too or if laboured slightly cleaned maf noticed it is aftermarket have daws value too mmmm

[threedogs]

Id say you need some boost if its the OE intercooler its probable leaking

[Glennloo]

I'll hook up boost gauge tonight and check that and look for leaks

[threedogs]

Is your rear boost hose on tight they have a habit of blowing off {blue hose]
It will blow black smoke and be gutless
What year and motor Im guessing a ZD30

You can also check the IC by removing it and blocking off
the inlet and outlet and applying some air pressure
[bike pump} and dipping it in some water.
Be sure its dry before you re install [hair dryer]

[mudski]

Is it running a needle valve too? The dawes does pretty much nothing to performance, it just limits max boost. The needle valve lets you control how fast the turbo will spool up to max boost. If you have a needle valve, its might be leaking boost pressure, or the needle valve is open too much, which slows the spool up rate.

[Glennloo]

I'll check that also Iv only had 4b for 2 weeks got it cheap my other was running perfect till it got stolen
Thanks thee dogs

[Glennloo]

I found 2 hoses run under air cooler to the front and one is slit

[Glennloo]

Would that cause it to lag or go into limb mode it's as if you are sitting on a 100 and after 5mins it will start to slow so u put foot down and nothing release and go and all good

[Glennloo]

Is it running a needle valve too? The dawes does pretty much nothing to performance, it just limits max boost. The needle valve lets you control how fast the turbo will spool up to max boost. If you have a needle valve, its might be leaking boost pressure, or the needle valve is open too much, which slows the spool up rate.

I'm not sure if it has needle valve do u mean on the Dawes valve??

[threedogs]

Yes thats probably the problem your losing boost by the sound of things.
Replace all your vacuum hoses with some 4mm efi fuel line cheap enough to do