weird boost loss ????

[woodzrs]

weird one , ive got a 56 reg gti turbo . had it a week , remap ko4 etc so well nippy and put your foot down and tracftion light is always coming on lol had 20 miles left in the tank so went to morrisons and put £25 normal unleaded in .been out in it today and its got no wang in it .

runs fine and pulls ok , but not the power that its had all week ? like a normal car?

cant here if the turbo is spinning etc . no smoke out the back and still got a bit of omph .

but surely your not gonna tell me that  its cos of the pertrol?

its a storm develpoments map

[camfollower]

Get some decent fuel in there... Vpower and retest.
No change, check PCV
No change, run VCDS
No change, replace DV

[RENNTAG]

Could well be because o the petrol. You have not put in 98 ron so the ecu has adjusted and reduced the boost

[Pikey Motorsports]

check diverter valve and pcv..

[woodzrs]

Cool . Where's the divertor valve ? What's a Pcv ? And what's vcds ? Any way I can check it or got to be job for garage ? I'm useless under the bonnet lol

Surely the ecu can't adjust the boost within 5 miles ?

[camfollower]

Afaik, the ecu samples the fuel and changes various settings from that sample... I've noticed a power drop on one fillip of crap supermarket fuel.

PCV test, do a search, basically when car is running, open the bonnet and remove the dipstick for a second or two, don't leave it out!!  If the car starts spluttering then your PCV is probably ok, if there is no discernible change, then you could need to change it.

VCDS is a diagnostics system, many members have it, check the VCDS in your area thread.

DV, can be checked from the engine bay on K04 but on normal GTIs youll need to the lift the car, best to just replace if the other elements have been ruled out, they are circa 30 quid, grab a revision G one.

[JackG]

does it pop or judder at all?

[woodzrs]

Where is the turbo under the bonnet ? I had a look but the cover covers most ? And if I find it how do I check dv ?

Now I've said it , it has a slight judder when it was sitting before I went to fill up ? Then last night and this morning when I started it , it had a pop as I changed into 2nd gear ? Then slight judder when I was sitting 2 mile up the road ? But done 20 mile since and no more pop or judder ?

[woodzrs]

Stated to pull dipstick out and car started to splutter so put it straight back In

[JackG]

check your follower, mine happened in the exact same way as yours did, its only 3 bolts, not worth the risk 

[woodzrs]

What's the follower ?

[sanj]

What's the follower ?

http://www.mk5golfgti.co.uk/forum/index.php/topic,8339.0.html