New Turbo

[Spec83]

If putting in a Motec / Haltec / Microtec would it be easier if you convereted to a cable throttle as I know electronic throttle sometimes do not work too well with aftermarket ECU's?

[99gti]

I recently explored big turbos etc and this was the conclusion I came to.

GT3071r is way to big unless you are wanting specificly to build a dyno queen or a purpose built drag car. The power would be un-usable for a road car or even a track car. It would take too long to spool up and unless you stripped the motor to do the internals, you could never take full advantage of what that turbo has to offer.

GT2871r is about as big as you would want to go and still to take full advantage of it you would need to do the internals. The internals are only good to about 300hp. Traction on boost is still going to be a major issue so a LSD is going to be required. There are a couple of 1.8T's running this turbo in Aus, so it can be tuned. One was done using a Haltech and the other is a GIAC tune. You still have the problem of getting the power down coming out of corners because the torque spike just sends you into a flurry of wheels spin. Having 4 wheels to get the power down with may help, but that's not going to help you in a polo.

There is also the GT28rs or disco potato. This is what I was originaly looking to do, and it more suited to the application you are trying to use it for. This would get you a true 300hp car but again you would be on the edge of doing the internals. Probably the most drivable out of all the options and you would be making efficient use of the turbo.

The K04-023 from the S3 is the path I ended up going down. I can use all OEM parts such as S3 injecters, S3 manifold and 4 bar FPR. This yields significant gains over the K04-001, but it should still be a very comfortable and easy daily driver. I am aiming for 220 atw, but from the research I have done it should be capable of more. Anything on top of 220 will just be a bonus.

The K04-001 is the easiest. Direct bolt on and you only need 4 bar FPR.

[FL00DY]

I don't get it. I'm all for more power, but perhaps picking a better base to start from. Personally I don't see the point in chasing such massive numbers from a hatch, it was built for corners. But each to their own

[Guy_H]

The K04-023 from the S3 is the path I ended up going down. I can use all OEM parts such as S3 injecters, S3 manifold and 4 bar FPR. This yields significant gains over the K04-001, but it should still be a very comfortable and easy daily driver. I am aiming for 220 atw, but from the research I have done it should be capable of more. Anything on top of 220 will just be a bonus.

The K04-001 is the easiest. Direct bolt on and you only need 4 bar FPR.

Hey Neil, I think you mean anything more than 150kw @ wheels - honestly - its still a K04 (not trying to spoil the party but it is really wayyyyyy to small to get near 200kw on a street tune)

[99gti]

Hey Neil, I think you mean anything more than 150kw @ wheels - honestly - its still a K04 (not trying to spoil the party but it is really wayyyyyy to small to get near 200kw on a street tune)

Ah sorry, HP not KW... The majority that I have seen to dat have done 220HP but quite a few have done more. The ones with the most linear curves have been there abouts. 220HP I think works out to be about 160kw...

[VW GTI]

Hey Neil, I think you mean anything more than 150kw @ wheels - honestly - its still a K04 (not trying to spoil the party but it is really wayyyyyy to small to get near 200kw on a street tune)

What were the figures you got to on your Polo? I seem to remember on Drive GTI that it was referred to as the 190kw APR Polo.

[Guy_H]

Ah sorry, HP not KW... The majority that I have seen to dat have done 220HP but quite a few have done more. The ones with the most linear curves have been there abouts. 220HP I think works out to be about 160kw...

Thats a bit more like it! - I thought you were haviing lunch with the fairies!

[Guy_H]

What were the figures you got to on your Polo? I seem to remember on Drive GTI that it was referred to as the 190kw APR Polo.

K04 with Race gas made 158kw@ wheels & without racegas 145 ~ 150

[BL33SU]

K04 with Race gas made 158kw@ wheels & without racegas 145 ~ 150

wot a nugget

[Bug_racer]

The S3 KO4 flows slightly more than the normal replacement ko4-001 .
I will never understand why you would want to go bigger than a KO4 in a front wheel drive car as a daily driver . The sheer cost of doing it would deter most people , but when you take into account the loss of driveability , the extra wear on other parts , drivetrain problems etc , you really are putting yourself into a money pit that in reality , you could have just bought an S3 , chipped it , and would be making almost as much power as the fwd Polo with a gt28 and be more reliable , more fun to drive and better on fuel . Without the right chassis strengthening 200fwkw+ is a handful to drive and when it comes on boost in the wet it just changes lanes . There is 1 Golf mk4 running round with a gt30 somewhere , havent seen it for a while , but having known the guy that use to own it , it was as reliable as a 20 year old camira !

[Edra]

can you high flow the k-04 for better results ??

[aprr32]

I am just making 160kw atw in the Caddy with a K04 but with an Autronic ecu which gives a lot of tunability unlike stock ecu's.I also have kept excellent drivability and economy(highway) but have reached the limit of reliability of the internals.I think this is just about the limit of front drive power if planning on driving the car every day and even in the wet 20psi is too much grunt to be practical.
Peter