Bigger injectors for GTI

[Pommie]

It depends on how much your spending, I did mine myself so it cost me less than $500, plus the tune. I would say yes, it is a lot faster than it was with the stock turbo and APR tune.

[Mitch2001]

Ok great!

I don't really want to spend much or i may as well go and lease a Golf R and eat everything.
more than $1800 for it all incl the ko4 software @ $750 would be pushing the friendship.
The Ko4 itself ill con my mate to install as i think that is out of my league.

The Ko4 that I have been quoted is $1300 and he reckons he will chuck in a Greddy boost controller. Ill flog that off on ebay or something if I really need to bring it under the $1800 mark anyway.

Do you hear the "Hiss" drastically increase when its spooling/boosting???? and finally, would you say it is that again of the power difference between completely stock to the APR Tune?? 2nd gear pulls hardest so i would assume that with the ko4, itd be like 2nd gear but through all the gears. Please shed some light

[Pommie]

if you can get it all done for under $1800 then I reckon it would be worth it. In mine second get is not really usable as it just spins the tyres, so third is now my new second. and forget about trying to use first.
Not much more hiss.
Nothing is as dramatic as the stock tune upgrade.
one thing I would say is it now pulls all the way through the rev range, when before it faded a bit towards the top-end...

[noone]

The K04 is an old design, I'd think about something link the Frankenturbo, but it will cost more to setup. As for traction, etc, depends on your suspension setup.

[Spec83]

The software never changes in the car, it is fixed, so no use reprogramming it. What does change (in the fuel system) is

Fuel filters clog up & let less fuel through
Fuel Pumps can die (our own Polo GTI K04 had this issue & it took us weeks to work it out)
Injectors can become dirty and / or blocked

Thats why its important to log data to try to find the exact cause of your issue!

How do you figure out if the fuel pump is dying Guy???

[Jmac]

Checking fuel pump reqs you to check the flow rate as well as the pressure. My thoughts would be to dyno it and see what the A/Fs are like, also check the pulse width of the injectors. If its pinging wide open throttle thats no go mate thats asking for it to go pop. Pinging is putting serious stress on you pistons, im sure you are having the sense to back off. Remember too that logging is ok but laptops and VCDS are not real time, they are good but can miss heaps. If you have to get right into it dyno and scope is the answer. Chekc the basics first though, fuel filter and plugs. you might want to drop a heat range too while you are at it. At WOT the vac is off the fuel reg so it will also be coming into play, 3.5 bar reg might not be up to it, up it to a 4 bar reg perhaps.
Cheers
Jmac

[Guy_H]

As Jimmy said. It's not easy, but you will see you fuel trims & injectors staying open longer trying to supply more fuel. It's nice to have some data off a healthy one for comparison.

[Pommie]

That's great advise but I have no idea who to take it to with any experience in VW tuning on the Central Coast NSW. I may have to travel to get it done.