All the following turbos have the same installation dimensions and
thermodynamical performance. The differences are only in the actuator that
opens the turbine bypass valve:
K03-011 (5303 988 0011) 150 hp, 65 N actuator
K03-026 180 hp, 85 N actuator
K03-035 180 hp, 85 N actuator
K03-044 150 hp, 65 N actuator
K03-045 156 hp (Ibiza Cupra), 85 N actuator with 2 ports
K03-049 150 hp (Sharan/Alhambra), 65 N actuator
The 180 hp versions have an actuator with a higher opening force due to the
higher exhaust gas pressure (which is a consequence of the higher boost
pressure). Otherwise the valve would be pushed open by the exhaust gas
pressure.
The following turbos are a further development (since 2000) and have an
improved and slightly larger compressor while using the same turbine (still
with the same installation dimensions):
K03-052 180 hp, 85 N actuator
K03-053 150 hp, 85 N actuator
K03-058 150 hp/180 hp, 85 N actuator
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
See here for some more info:
http://www.seatcupra.net/forums/showthread.php?t=35228Which engines?
Typically K03 are on AGU engine codes on lots of early VAG cars.
K03s = AUM AUQ engine codes from the following :
Mk1 Leon Cupra,Seat Ibiza Cupra, Mk1 Skoda Octavia VRS, Audi A3, A4, Boras
KO3s turbo numbers:
KO3-052, 053,058 or (K03/82 from a Polo GTI) For k03s
If you look into the inlet, the ko3 has 12 fins, the ko3s has 8.The reason behind the different part numbers was due to one being from the Octavia (silenced version), one from the AUM/ARZ engined Golf/A3 and the other was from the 180bhp Anni Golf/Cupra
K03s at the top of the pic, K03 at the bottomBoost pressure:
AUM (150bhp) - 0.6bar / 8.7psi
AUQ (180bhp) - 0.8bar / 11.6psi
1bar = 14.508psi