GTi Power...doesnt feel right...

[peteon2wheels]

I have wondered for some time what the power if my Gti should be like. I just bought a Polo Gti for the missus (06 racing red) and to get out of the Polo in the the Mk4 is just disappointing. There is no turbo rush, and the engine just doesnt pull like a turbo should.

I figure the Gold should be a liittle slower being heavier but i had 4 people in the Polo the other day and still it pulls hard.

Should there be this much of a difference..? Anyone been in both? I just cant tell, it pulls okay, but it feels more like a naturally aspirated. I'm wondering if it is making boost properly - just put a POD on it and can hear the induction a little more, can hear the DV heaps more (actually when i didnt really think it should be going off in terms of not having enough boost) but i can hardly hear the turbo spool up. i need someone to take me for a drive in one that is definetly normal...

What you guys think...?

[Golf Houso]

Are you sure you don't have a vacuum leak? My mother's 1.8t Passat had one, and really wouldn't go anywhere until about 4500. Also don't forget its a 150hp motor in a 1300 odd kilo car, its never going to be as fast as the polo stock for stock...

[peteon2wheels]

yeah, i expect it not to be as fast - there is just no turbo rush. the Polo feels like a fast car - or at least it feels like it is a turbo. The golf doesnt seem like a turbo...

[h100vw]

Pete, has it ever had a MAF replaced? You could see how it runs with the MAF disconnected. If it runs better, then you probably need a new one. If not then something else could be amiss.

Do you know someone with VAG-COM that could scan it for you? That would be the best thing to start with.

Gavin

[peteon2wheels]

Gavin – I disconnected the MAF this morning and there was absolutely no difference. Didn’t run better or worse. What does that mean..?

I have a theory though – listening to the car once the POD was on the DV was a lot more noticeable then I expected. It seems to release at lower boost then I would expect. What I notice is that I can here the turbo spool up at low revs and then once I get to just under 3k rpm, the boost whistle goes away and is replaced by induction sound. I would have expected that at around 3 is when it would boost up more…? Is this correct? If so, the DV may be leaking the boost.

Also, when the DV releases I have paid attention to that noise. I can sit on around 3k rpm, back off the throttle to get the DV to release and then hold that throttle to keep the DV blowing – this is not normal is it…? This same sound is what seems to replace the turbo whistle as it moves up towards 3k rpm…

Any thoughts on this???

[Bug_racer]

Any thoughts on this???

Block your dv and see if it boosts more

What boost is it running ?

[h100vw]

Gavin – I disconnected the MAF this morning and there was absolutely no difference. Didn’t run better or worse. What does that mean..?

I have a theory though – listening to the car once the POD was on the DV was a lot more noticeable then I expected. It seems to release at lower boost then I would expect. What I notice is that I can here the turbo spool up at low revs and then once I get to just under 3k rpm, the boost whistle goes away and is replaced by induction sound. I would have expected that at around 3 is when it would boost up more…? Is this correct? If so, the DV may be leaking the boost.

Also, when the DV releases I have paid attention to that noise. I can sit on around 3k rpm, back off the throttle to get the DV to release and then hold that throttle to keep the DV blowing – this is not normal is it…? This same sound is what seems to replace the turbo whistle as it moves up towards 3k rpm…

Any thoughts on this???

Could be it's broken but that's not guaranteed. I'd check out the DV, if you can stand it, suck on the vacuum pipe connector. You shouldn't be able to suck any air out. If you can the diaphragm has gone and it's new DV time.

If you could borrow a MAF to check that out it might be more indicative of a duff one being fitted now.

VAG-COM would let you look at the airflow being sent to the ECU. There is a basic calculation that allows you to work out hp based on airflow, I can't find it just now. If you run the car hard somewhere quiet and note the airflow near the redline you can see if it is producing 150hp.

Gavin