Just got myself a ko3s turbo as my vrs has a ko3 on. I've got the 053 one which is a unsilenced one, just checking this will go on ok and be alright. Only paid £60 for it so that's why I took what he had as when I was googling it there's 3 types of ko3s, the 052 is a silenced one for the vrs then there's 053 and 058 ones all have same 85nm actuator on it so I've presumed they all fit

Picked it up and no play in the shaft all looks good. So as I said before there is the 052 which is the silenced vrs one this is the 053 which is the aum 150 turbo but as far as I'm aware this will hold the same power as the 052 and then the 058 was fitted to the anni golf. Does anyone know why the vrs had a silencer on it???

Im sure someone on here fitted a 053 model on there vrs and had issues with lack of boost because it was from a golf. I also had no idea some where silenced etc.. Strange

Well I'm running a ko3 at the min so I'm sure this will be a improvement lol. From what I've read about them the golf boys get the same sort of power when mapped up and they run the same actuator so should make the same power more or less. I was more wondering in terms of is there any physical difference but I don't think there is

Your best off having a search on this forum because someone had trouble with theres. Maybe it was a duff turbo i dont know

http://www.briskoda.net/forums/index.php?/topic/281275-HELP%21

Copied from the golf forum but to me I read it as exactly the same turbo apart from not silenced or I missing something???

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=35228

Which 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