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Model specific boards => Golf mk4 => Topic started by: B8SON on 10 March 2008, 21:25

Title: 1998 Mk4 1.8t Engine Tuning
Post by: B8SON on 10 March 2008, 21:25

Hey all. After much trawling through the forums about this subject I'm left a little comfused (that happens to me a lot!).

I have a 1999 (s reg) golf gti turbo and have been offered a few bits from a audi s3 (2000 model) - I know the car well as it belongs to a friend of mine that is fitting a bigger turbo etc. I already have a BMC CDA filter (hello compression surge!  :laugh:) and a miltek system will be going on soon with a decent set of coilovers in prep for more power. Maybe also an apexi avc-r.

My questions are: what will I need to fit to get the s3 turbo on there (fuel pump, injectors, clutch are a given but im not sure about the manifold or the downpipe). Also, once it's on the car I'll be looking at one hefty re-map and I know from looking at the JBS website that my ECU can't be flashed with software so how should I approach this ??

Sorry if I am repeating questions that have already been asked and answered  :rolleyes: - I did look at the threads first honest!!

Thanks in advance.

Title: Re: 1998 Mk4 1.8t Engine Tuning
Post by: Ashmond on 11 March 2008, 12:04

Right as nobody as helped you out on this i will!

The turbo on a s3 (apy or apx lump) is a KO4, you will need oil and water lines, new exhaust manifold and downpipe as well as the injectors, then you'l need a remap straight away. You can get away with using a standard mk4 clutch depending on what power your going to be running, I have heard of alot of people using clutched from a vr6 on 1.8t's with ko4's.

If upgrading from a KO3 to a KO4 I wouldnt get a flash map done (generic map), I would get some dosh together, take your car to somewhere with a rolling road and get a live custom map done, its the only way to really get the most out of your car safely, rather then just having a presaved map which isnt designed specifically for your set up.

hope that helps mate!

Ash

Title: Re: 1998 Mk4 1.8t Engine Tuning
Post by: B8SON on 11 March 2008, 19:01

Thanks for that Ash, do you know if I can use the oil and water lines from the S3?

Also, can I use the S3 manifold (I have an AGU lump)? I'm guessing I will have to get a downpipe fabricated as the S3 downpipe is shaped to go around the axle. Unless anyone know's of somewhere that produces them?

I'll take your point about the re-map, I've spoke to Jabba sport but they don't want to do it as they'd prefer to put an IHI on - which is fair enough really although dissapointing for me!   :cry:  AMD have offered to do it but they said they'd need the car for a few days. Could I drive the car to the rolling road after fitting the turbo if I keep off boost?  :smiley:

Has anyone done this conversion before? Interested to hear how you done it and what power you're getting.

So many questions!   :shocked:

Cheers
Matt