A random collection of K04/K03 turbocharger information, flow maps to be added. This is mostly for my reference and to dispel the K04-025 on GM LNF 2.0T (and other 2.0T variants subsequent to the LNF) myth and people using flow maps from a woefully inadequate turbo.

The RS4 K04s are pretty pathetic for flow if you’re looking for an upgrade – the RS6 is better, and shares many turbine dimensions with the Solstice GXP/Sky Redline GM LNF 2.0T K04 (K04-2277DCB/437). This is mainly for myself to dispel useless information showing K04-0025 compressor maps for the LNF K04, the K04-0025 is TINY compared to that turbo (just check out the compressor size below.. the turbine is also sized much better). We’re talking about a 35lb/min turbo with >1 bar of boost to about 25lb/min. If the Solstice turbo is used on the 2.7T (with modified plumbing, flanges, and probably custom exhaust manifolds) you could either make a lot more power — or make just as much power more efficiently (lower IATs) all while barely experiencing increased spool time. Much cheaper/better than options like the GT2871R, and the same issues to deal with (2.7T has crazy intake piping as part of the compressor housing instead of dealing with this in soft hose or external hard lines).

 

If you want a ton of power the GT2871R is still a better option, but the K04-2277 should meet most needs beyond the RS4 K04s, and could likely be upgraded with the K04-2283 compressor wheel with a machined compressor housing — easily good for 800HP at the crank.

A Comparison of turbo compressor wheels (does not show 2283, but shows everything under that):

http://frankenturbo.com/web-content/image_hosting/K03-K04-compressors-showcase.jpg

http://frankenturbo.com/web-content/image_hosting/23-series-comparisons.jpg

Compressor inducer/exducer diameters in millimeters:

S3:  2283 wheel – 45/60

LNF: 2277 wheel – 43/56(59)

RS6: 2275 wheel – 42/56

RS4: 2078 wheel – 39/51 **or close, specs list 39.9mm/51mm

 

S4/A6 K03: You don’t want to know.

 

S3 K04-2283D (-0064) turbo:

Known as:

K04-2283D, K04-2283DX, K04-0064

 

BW PNs:

BW PN: 55304 988 0064

BW Service PN: 5304 970 0064 (alt 5304-970-0191)

Cartridge PN: 5304-710-0518

 

K04-0064 Compressor Wheel:

Inducer (A): 46.38mm

Exducer (B): 55.94mm

Bore: 4.63mm

Total height: 25.77mm

 

 

 

Solstice LNF Turbo:

GM PNs:

12618667 (old PN?)

12658317 (new PN? GMPartsDirect)

12598713 (Borg-Warner lists for Engine “L850” under Solstice GXP)

 

Known as:

K04-2277DCB/437

K04-0059

 

BW PNs:

BW PN: 5304-988-0059

BW Service PN:  5304-970-0059   (alt 5304-970-0200, 5304-970-0184)

Cartridge PN: 5304-710-0517

 

 

 

 

Compressor:

https://www.turborebuild.co.uk/webshop/prod_6067200-KKK-K03K04BV50-Turbocharger-NEW-replacement-Turbo-compressor-wheel-impeller-53061232007.html

BRAND:    AFTERMARKET

QUALITY : OE

OE COMPRESSOR WHEEL NUMBER: 5306-123-2007

INDUCER DIAMETER (A):    43.3mm

EXDUCER DIAMETER (B): 59.3mm

TIP HEIGHT (C):                      4.5mm

TOTAL HEIGHT (D):               27.7mm

BLADES:                               6/6

TRIM/SUPERBACK:             Superback

BALANCED:                          YES

This turbo compressor wheel fits the following OE turbo part number:

5304-970-0035,5304-970-0043,5304-970-0045,5304-970-0049 ( VXR ),5304-970-0050,5304-970-0054,5304-970-0059,5304-970-0060,5304-970-0184,5304-970-0200

 

Turbine:

BRAND:    AFTERMARKET

QUALITY : OE

OE COMPRESSOR WHEEL NUMBER:     5304-120-5031

INDUCER DIAMETER (A):                  50.00mm

EXDUCER DIAMETER (B):                  44.50mm

TIP HEIGHT (C):                        7.4mm

JOURNAL BEARING DIAMETER (D):         7.0mm

COMPRESSOR WHEEL BORE:                 4.6mm

BLADES:                                12

SLENDER/STRAIGHT SHAFT:     Straight

BALANCED: YES

This turbo turbine shaft and  wheel fits the following OE turbo part numbers:

5304-970-0059,5304-970-0184

 

 

 

 

 

 

 

K04-0028/0029

https://www.midwestturboconnection.com/product-p/3505.htm

 

Specs – CHRA:

https://www.turborebuild.co.uk/webshop/prod_5484569-Audi-RS6-Turbo-CHRA-Cartridge-KKK-K04-53049700028-53049700029-077145703P-077145704k-Turbocharger-Core.html

 

5304-123-2203 Compressor Wheel

 

K04-28 K04-29 CHRA. Commonly found on Audi RS6’s

 

Turbo OE No: 5304-970-0028

Service Turbo no: 5304-988-0028

Turbo OE No: 5304-970-0029

Service Turbo no: 5304-988-0029

 

CHRA Part #: 5304-710-0512

Comp Wheel Specs:

Inducer Diameter A (mm): 41.9

Exducer Diameter B (mm): 56.0

Tip Height C (mm): 5.9

Total Height D (mm): 25.7

Number of Blades: 4\4

Flatback/ Superback/ trim: 2275 Superback

 

Turbine Wheel Specs:

Inducer Diameter A (mm): 50

Exducer Diameter B (mm): 44.5

Tip Height C (mm): 6.5

Journal Bearing Diameter D (mm): 7

Comp Wheel Bore E (mm): 4.6

Number of Blades: 12

Type of Shaft: Straight

 

Compressor wheel PN: 5304-123-2203

 

 

Turbine (verification):

https://www.turborebuild.co.uk/webshop/prod_3464529-KKK-Turbocharger-Turbine-Shaft-and-Wheel-K04-Turbo-53041205018.html

BRAND:    AFTERMARKET

QUALITY : OE

OE COMPRESSOR WHEEL NUMBER:     5304-120-5018

INDUCER DIAMETER (A): 50.0mm

EXDUCER DIAMETER (B): 44.5mm

TIP HEIGHT (C): 6.5mm

JOURNAL BEARING DIAMETER (D): 7.0mm

COMPRESSOR WHEEL BORE: 4.6mm

BLADES:                                        12

SLENDER/STRAIGHT SHAFT:                 Straight

BALANCED:                                    YES

 

 

 

K04-0025/0026

 

Turbine :

https://www.turborebuild.co.uk/webshop/prod_4040658-KKK-Turbocharger-Turbine-Shaft-and-Wheel-K04-Turbo-53041205015-4250mm.html

BRAND:    AFTERMARKET

QUALITY : OE

OE COMPRESSOR WHEEL NUMBER:     5304-120-5015

INDUCER DIAMETER (A):                       50.00mm

EXDUCER DIAMETER (B):                       42.00mm

TIP HEIGHT (C): 6.40mm

JOURNAL BEARING DIAMETER (D): 7.00mm

COMPRESSOR WHEEL BORE: 4.60mm

BLADES: 12

SLENDER/STRAIGHT SHAFT:                   Straight

BALANCED: YES

 

Compressor:

https://www.turborebuild.co.uk/webshop/prod_4329184-KKK-K04-Turbocharger-NEW-replacement-Turbo-compressor-wheel-impeller-53041232021.html

BRAND:    AFTERMARKET

QUALITY : OE

OE COMPRESSOR WHEEL NUMBER: 5304-123-2021

INDUCER DIAMETER (A):   39.90mm

EXDUCER DIAMETER (B): 51.00mm

TIP HEIGHT (C):                   4.8mm

TOTAL HEIGHT (D):             25.70mm

BLADES:                               4/4

TRIM/SUPERBACK:             Superback

BALANCED:                          YES

 

 

 

K03 5303-970-0025 (1.8T):

Compressor:

https://www.turborebuild.co.uk/webshop/prod_3413743-KKK-K03K04-Turbocharger-NEW-replacement-Turbo-compressor-wheel-impeller-53041232018.html

BRAND:    AFTERMARKET

QUALITY : OE

OE COMPRESSOR WHEEL NUMBER: 5304-123-2018

INDUCER DIAMETER (A):   36.0mm

EXDUCER DIAMETER (B): 50.0mm

TIP HEIGHT (C):                   4.7mm

TOTAL HEIGHT (D):             25.6mm

BLADES:                               6/6

TRIM/SUPERBACK:             2072 Superback

BALANCED:                          YES