ko3s

[Audiringers]

i have a 1997 a4 1.8t and it has just the stock ko3 on it and i was wondering if i have to get a new turbo inlet the one that goes from the turbo to the air box or will the stock one fit

[mike-2ptzero]

It will fit, there is no difference between the K03's.

[Audiringers]

are you 100% sure

[LaserRedKid]

Do you come here often?

[mike-2ptzero]

are you 100% sure

100% sure about what. The fact that the inlet of the K03 is the same on all of the ones that were used in the A4 1.8t? Even the inlet on the k04 is the same the one on the K03 seeing that it uses the same compressor housing.


Plenty ndbw A4 owners have installed a 2000+ K03 onto their car while using the stock hose. I sold my stock K03 off my 2000 and it went right onto a friends ndbw A4.

[Audiringers]

no i dont why

[Audiringers]

100% sure about what. The fact that the inlet of the K03 is the same on all of the ones that were used in the A4 1.8t? Even the inlet on the k04 is the same the one on the K03 seeing that it uses the same compressor housing.


Plenty ndbw A4 owners have installed a 2000+ K03 onto their car while using the stock hose. I sold my stock K03 off my 2000 and it went right onto a friends ndbw A4.

alright thank you i was just a little confused i didnt want to buy a ko3s and the it not fit thanks for all your help

[myb5quattro]

Do you come here often?

I think what he was getting at is this is basically common knowledge on here, and talked about often. I hope that doesn't sound too blunt, but the K03s vs k04 threads are always going, and those turbos are just talked about a lot and there is a ton of information on the forum if you search. Good luck, and try to search here before posting. It helps people from answering the same questions over and over, and you actually get your answers faster because of the info that is so readily available here. But good luck with your turbo upgrade, let us know how it works out

[malanca]

Left side = stock, right K03-0073...fits without any problems.

[geeky]

K03-0073? do you not mean the K04-015? those fins (8) look like the k04

[malanca]

Yes, 0073, it's a K03 for sure. This is the turbo mounted in the B6 1.8T BEX engine (stock 190 BHP). Possibly this engine type was never available in the US; in Europe this is a very popular turbo-upgrade as an alternative to the K04.

[mike-2ptzero]

K03-0073? do you not mean the K04-015? those fins (8) look like the k04

That is exactly why going from a K03 out of a 2001+ to a K04-15 doesn't gain you much.

[mike-2ptzero]

Yes, 0073, it's a K03 for sure. This is the turbo mounted in the B6 1.8T BEX engine (stock 190 BHP). Possibly this engine type was never available in the US; in Europe this is a very popular turbo-upgrade as an alternative to the K04.

The hp is just the result of the car running more boost on the stock tuning Audi put in it. This can be seen when looking at the pre 2001 and the 2001+, the pre 2001's only ran 8psi to make 150 hp while the 2001+ ran 11psi to make 170hp. This is why once the cars were chipped to the same boost level they make about the same power. All audi had to do is set the boost to 1 bar on a stock car to sell it as a 180-190bhp model. In europe they even had a B5 model sold as a 180bhp sport.

[djwimbo]

Just to beat the dead horse, I installed a K03s off a 2001 in my car (1998.5). Fitment is identical, power gains are minimal if any.

The only differences I know of between the K03 and K03s are the 0.5mm larger Dia turbine shaft and the "K04 style" compressor wheel.

EDIT: The K03s off the longitudinal engines IS NOT the same as the K03s from the transverse engines. I just wanted to clarify before some r-tardy asks again.

[malanca]

To clarify some things:

The turbo mostly installed in the >2001 types is the 0029. I agree that the power gain swapping from a stock AEB turbo (the 0005) to a 0029 is not noticable. Even the compressor wheel, comp. housing and turbine housing of the 0005 and 0029 are the same. The only difference is the exhaust wheel which is, indeed slightly bigger.

Very often called and sold as a K03S (S for sport?) is the 0029. The term 'K03S' does not even officially exist in Borgwarner specifications.

Definately the 0073 is not the same as the 0029. This is a different turbo, different comp. wheel and housing, different exhaust housing and wheel. Its top-end performance is close to that of the K04-0015.

EDIT

The hp is just the result of the car running more boost on the stock tuning Audi put in it. This can be seen when looking at the pre 2001 and the 2001+, the pre 2001's only ran 8psi to make 150 hp while the 2001+ ran 11psi to make 170hp. This is why once the cars were chipped to the same boost level they make about the same power. All audi had to do is set the boost to 1 bar on a stock car to sell it as a 180-190bhp model. In europe they even had a B5 model sold as a 180bhp sport.

Sorry, but Audi used the same turbo in the 150 and 180 (US 170) models. The later B6 1.8T 190 BHP has definately the 0073 turbo. They did not just ad some extra boost only. But as I mentioned, maybe this BEX engine was never available in the US which will make things a bit confused.

[mike-2ptzero]

Sorry, but Audi used the same turbo in the 150 and 180 (US 170) models. The later B6 1.8T 190 BHP has definately the 0073 turbo. They did not just ad some extra boost only. But as I mentioned, maybe this BEX engine was never available in the US which will make things a bit confused.

What does a chipped 0073 put down? Because it isn't like even the older K03's cant make 190bhp, even my ATW K03 was able to make 250bhp on race gas.

So basically what I am asking is what is the power difference between a US K03 vs 0073 when they are both running the same boost level?

[malanca]

A 0073 does 240-250 Hp max. on normal street-gas (93). Of course only in combination with a decent exhaust (2.5"), racekat and FMIC (see my signature for my mods); picture shows my testrun. Torque is 353.5 Nm (about 260 Lbft).

These power-ratings are impossible with the 0029. What turbo did you use to make 250 Hp?

[PoormansA4]

are you 100% sure

not related but thought this was funny, im sure mike knows

[mike-2ptzero]

A 0073 does 240-250 Hp max. on normal street-gas (93). Of course only in combination with a decent exhaust (2.5"), racekat and FMIC (see my signature for my mods); picture shows my testrun. Torque is 353.5 Nm (about 260 Lbft).

These power-ratings are impossible with the 0029. What turbo did you use to make 250 Hp?

The stock K03 that Audi put on my 2000 A4 1.8t. To make that power I ran 20psi on 104 octane.

[malanca]

The stock K03 that Audi put on my 2000 A4 1.8t. To make that power I ran 20psi on 104 octane.

wow, respect. According to Etk@ the 2000 AWT engine has the 0029 turbo (OEM nr. 058145703J). What other mods did you make?

PS i run on 98 octane.

[mike-2ptzero]

wow, respect. According to Etk@ the 2000 ATW engine has the 0029 turbo (OEM nr. 058145703J). What other mods did you make?

PS i run on 98 octane.

FMIC, CAI, test pipe, stock down pipe, 2.5" exhaust and clutch. Everthing else was stock.


Picture of that K03 when I pulled it out to replace it with the T28 sitting next to it.

[malanca]

Looks like a 0029 to me. Amazing to pour 250 Hp out of that tiny turbo...I suggest you did not use this amount of power on daily highway trips?

The ATW engine..? Can't find that one in the catalogs. Probably this is a US engine which never has been available in European models...could explain the confusion.

Of course that Garry is way better for high hp's .

[mike-2ptzero]

Looks like a 0029 to me. Amazing to pour 250 Hp out of that tiny turbo...I suggest you did not use this amount of power on daily highway trips?

The ATW engine..? Can't find that one in the catalogs. Probably this is a US engine which never has been available in European models...could explain the confusion.

Of course that Garry is way better for high hp's .

Yeah the 2000 here in North America was the ATW and was only used for that 1 year.


Shot of my ATW block when it got some new 83.5mm JE pistons. You can see the ATW stamp on the side of the block.






No I did not run that setup on the street, that was my race tune setup but my street tune ran 26psi on pump gas. I actually still have my race chip around here some where.