Mk 5 Golf gti boost leak

[grcmoto]

Hi all, i hope somebody can help, i havent long had the car and had it mapped soon after. Its been roughly a month since mapping it and ive found myself with a problem...
Running round town on light throttle is fine i can feel the turbo working but if i accelerate hard i can feel it come on boost but as its starts to hit full boost it goes very flat, will still accelerate just not very fast.. I had it on vag com and it brought up a fault which a friend diagnosed it to be a boost leak??
Are there any common parts of the boost circuit to let go like this?

Thank you

Andy

[illyun]

What map have you had?  Revo, APR, other?  Normally the Diverter Valve goes - I had a Forge Stainless Steel valve at around £130 incl VAT - put in when I had a Stage 1 Revo.

[WhiteGTI]

As Illyun says, likely to be the Diverter Valve.

Could also be the PCV Valve.

[grcmoto]

Thank you very much guys, i have it Bluefin'd (superchips). Do you have any experience in tuning these engines? I just have the map and a carbonio intake and at a guess it is producing around 250bhp, which is great, but i have seen a few with 300bhp and they look awesome... What would be the next stage?

Oh and sorry but could i ask what a pcv valve is??

Thank you very much

Andy

[illyun]

Oh and sorry but could i ask what a pcv valve is??

 

Yeah, I'd like to know too  :embarassed:

[topher]

Can you get the fault codes that vagcom brought up? Would be easier to pinpoint then.

[dan_apps]

Thank you very much guys, i have it Bluefin'd (superchips). Do you have any experience in tuning these engines? I just have the map and a carbonio intake and at a guess it is producing around 250bhp, which is great, but i have seen a few with 300bhp and they look awesome... What would be the next stage?

it seems like you have a std GTI K03, 300bhp is usually an ED30 K04, unless you want to fork out a fortune you wont be gettin much more than what you have BHP wise.

[grcmoto]

Ah ok thank you. Can anybody help me with locating the diverter valve, i'm having a look myself but having no luck?

Cheers guys

Andy

[dan_apps]

http://www.golfgtiforum.co.uk/index.php?topic=87420.10

look at Hurdy's reply at the bottom of the page and it has a link to the Forge website where it explains the fitting/ removal for ya

[WhiteGTI]

http://www.golfgtiforum.co.uk/index.php?topic=87420.10

look at Hurdy's reply at the bottom of the page and it has a link to the Forge website where it explains the fitting/ removal for ya

That diagram / fitting guide is for ED30 engines, where the DV valve is fitted at the front of the engine bay.

If the OP has a regular GTI, then it will be kind of at the bottom of the engine near the turbo..