K03 vs K04 Turbine Wheel Size

[Denio24]

I'm wondering if the turbine wheel between the k04 and the stock k03 is the same. Reason is, I have a good deal on a CHRA & Housing. What I would do to save costs is swap over the CHRA and compressor housing from the k04 onto the 2.0t stock exhaust manifold.

[diagnosticator]

The K-03 and K-04 turbines are the same size, the turbine shaft is the same size also. The K-04 has a larger compressor impeller and housing.

[Der Konig]

Ko3 - 97-2000

COMPRESSOR WHEEL
Inducer: 33.6mm
Exducer: 46mm
Tip height: 3.7mm

TURBINE WHEEL
Inducer: 45mm
Exducer: 38mm
Tip height: 6.8mm
Blades: 11

Ko3S - 01+

COMPRESSOR WHEEL
Inducer: 38mm
Exducer: 51mm
Tip height: 4.4mm

TURBINE WHEEL
Inducer: 45mm
Exducer: 38mm
Tip height: 6.8mm
Blades: 11

Ko4-015

COMPRESSOR WHEEL
Inducer: 35mm
Exducer: 50mm
Tip height: 3.7mm

TURBINE WHEEL
Inducer: 50mm
Exducer: 42mm
Tip height: 6.4mm
Blades: 11

[aluthman]

The S3 K04 (the one we want) is a K04-064 IIRC.

[Der Konig]

oh yeah, my bad. Stolen from another post on VW vortex

From franken turbo

The K04-064 has a modern-specification "full back" turbine rotor. What that means is the backplate in the casting carries all the way out to the rotor's widest edges. Dimensionally, it is a 50mm inducer and 44.5mm exducer.

For more information on BorgWarner's state-of-the art turbo technology, I recommend this technical brief they offer. Turn to pages 13-15 for turbine rotor documentation.

Kind of conflicting

I have found Arin@APR said " When I measured the S3 k04 compressor wheel the inducer was 46.32mm and exducer 59.57mm." But I cannot find any information on the turbine. Trying to compare internal specs between a "normal" K04 and the Frankenturbo F23

[jerseybrian]

The S3 K04 (the one we want) is a K04-064 IIRC.

If we send out our k03 for a rebuild and they can upgrade it to a k04, you need to specify you want the s3 k04 wheel? Or just let them do their job kinda thing?

[SykoraA4]

Ko3 - 97-2000

COMPRESSOR WHEEL
Inducer: 33.6mm
Exducer: 46mm
Tip height: 3.7mm

TURBINE WHEEL
Inducer: 45mm
Exducer: 38mm
Tip height: 6.8mm
Blades: 11

Ko3S - 01+

COMPRESSOR WHEEL
Inducer: 38mm
Exducer: 51mm
Tip height: 4.4mm

TURBINE WHEEL
Inducer: 45mm
Exducer: 38mm
Tip height: 6.8mm
Blades: 11

Ko4-015

COMPRESSOR WHEEL
Inducer: 35mm
Exducer: 50mm
Tip height: 3.7mm

TURBINE WHEEL
Inducer: 50mm
Exducer: 42mm
Tip height: 6.4mm
Blades: 11

this is great info for b5's, not applicable for the b7

[aluthman]

If we send out our k03 for a rebuild and they can upgrade it to a k04, you need to specify you want the s3 k04 wheel? Or just let them do their job kinda thing?

Call and talk to them. If they don't know which one to use, they don't get your money.

[Der Konig]

this is great info for b5's, not applicable for the b7

Yeah my b, I believe we use the ko3s though, no? And I updated with info about the ko4-064

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[hawk06glide]

If we send out our k03 for a rebuild and they can upgrade it to a k04, you need to specify you want the s3 k04 wheel? Or just let them do their job kinda thing?

Where did you send the K03 in to get it rebuilt?
Is it more cost effective thank buying a new turbo?

[Jeevan]

Where did you send the K03 in to get it rebuilt?
Is it more cost effective thank buying a new turbo?

It depends on few things

1) Are you cheap and ok with it running few thousand miles and not worry about it too much- get a cheap chinese turbo on amazon
2)Do you want to keep your car for long time but want to keep the replacement cost low- buy a known brand turbo like Mahle. you can get away with 500$ including tax
3)if you are willing to spend money- buy genuine Borg warner for 1100$ including tax
4) If your existing turbo has too many miles over 80-120k its not worth rebuilding and it will get costlier. 300$-400$(1-2 year warranty) if chra and wastegate needs to be replaced.

[Jayz691]

Well, Mahle are good turbos, but they are more like $750-$800. Ya can get an OEM BW for around $900 if ya shop around, $1100 with a full install kit.

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