Author Topic: Mk4 golf gti 1.8t AUM project for serious bhp please help  (Read 7971 times)

Offline Quinnquince

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Ok here goes.   Hi all my names Quinn I'm new to this forum and new to the whole concept of forum please excuses me for any misplaced questions/posted, spelling(I'm no academic) and my lack of knowledge with this car. Thanks right I've just brought a 2001 golf gti 1.8 turbo it has a aum engine 187000 on the clock a boost gauge fitted and a dump valve a rubbish paint job but a cheap price ;)

So when I brought the car from Birmingham and drove it home it was sluggish only boosted at 4psi and the oil pressure warning popped up once. I got home have been trying to get it running right for the time being I found a split pipe under the inlet (one that goes from inlet towards oil filter) replaced that. The boost gauge was not fitted correctly so sorted that and it's running a dump valve which I'm told is a no no lol but no choice at the moment. I brought a vagcom thingy it had 11 engine codes cleared them nothing's come back on. It know boosts a 10psi but drops up the rev range???? I've checked all pipes etc bit lost really any way I'm sure with some time a persistence ill sort that.

So moving on my plan is to buy another aum block and rebuild that then a head for it rebuild that too. So my question is if any is kind enough to help me what can I upgrade in the engine and head for more power or to handle more power ie crack shaft camshafts etc and where can I get it from kind regards Quinn again I apologise for any wrong doings also my other car is a rx8 which I've done the same project with but I couldn't look to the forums for help really as there are alot of guys out the who don't know **** about the rx8 engine and advise you to do things that aren't good so the rx8 had to be done the extremely hard way which took me six and a half years to source parts and info or things plus save a buy them (alot of wasted money and trail and error) many thanks guys any interest and help would be great !!!!!!!! :)

Offline Nino

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Re: Mk4 golf gti 1.8t AUM project for serious bhp please help
« Reply #1 on: 07 September 2013, 11:52 »
Rx8 doesn't that have that really pain in the arse engine that people don't know how to work on? The winkle engine?

Anyway the good news is the 1.8t is an easy engine to work on. And is easy to upgrade and not hugely expensive. Your AUM will have a KO3s turbo, you can get about 220-235 bhp from that turbo with the correct mods.

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Offline Quinnquince

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Re: Mk4 golf gti 1.8t AUM project for serious bhp please help
« Reply #2 on: 07 September 2013, 13:47 »
Cool cheers mate yeah the rx8 has a twin rotary engine 13b not many people know there stuff so you can only try trust your own judgements and I kinda want to achieve as close to 300bhp if not more mate seems alot of people run around 230 bhp

Offline barrym381

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Re: Mk4 golf gti 1.8t AUM project for serious bhp please help
« Reply #3 on: 07 September 2013, 13:53 »
Cool cheers mate yeah the rx8 has a twin rotary engine 13b not many people know there stuff so you can only try trust your own judgements and I kinda want to achieve as close to 300bhp if not more mate seems alot of people run around 230 bhp
300bhp will cost you mate but can be done quite easy now  :wink:

Offline Quinnquince

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Re: Mk4 golf gti 1.8t AUM project for serious bhp please help
« Reply #4 on: 07 September 2013, 13:54 »
Cool thanks good good please do tell lol

Offline barrym381

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Offline Quinnquince

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Re: Mk4 golf gti 1.8t AUM project for serious bhp please help
« Reply #6 on: 07 September 2013, 14:57 »
Ah wicked cheers mate so is this a kit on the market now

Offline Nino

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Re: Mk4 golf gti 1.8t AUM project for serious bhp please help
« Reply #7 on: 07 September 2013, 15:26 »
You will need a Ko4 turbo

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VW Car history - Mk3 1.8 GL - Silver - 5 door, Mk4 1.8t - Silver - 3 door, Mk4 R32 - Black - 5 door, Mk5 GTi - Black - 5 door, Mk4 R32 - Deep Pearl Blue - 3 door, MK6 2.0 TDI - Graphite Blue - 5 door, MK7 GTD - Solid Black - 5 door.
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Offline Quinnquince

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Re: Mk4 golf gti 1.8t AUM project for serious bhp please help
« Reply #8 on: 07 September 2013, 15:38 »
Is the k03s not a k03 with k04 internals ?

Offline dom

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Re: Mk4 golf gti 1.8t AUM project for serious bhp please help
« Reply #9 on: 07 September 2013, 16:10 »
Is the k03s not a k03 with k04 internals ?

Nope, Ko3, Ko3s and Ko4 are separate turbos. A Ko3 with Ko4 internals is known as a hybrid :wink: