k03 boost levels

right after some searching and reading various threads about how much boost a k03 can hold im still a little baffled

mines running 7psi which i beleive to be standard ish for a k03 AGU 20vt

lots of people are saying they are running 20psi ?? surely if this is the case the turbo much be running on the limit

so my question is how much boost would i require to hit the 200bhp mark obviously i would map the ecu to give extra fuel and adjust the timing map what boost should i aim for to get this

i dont want to kill the turbo so 20psi for me is a big no no from what i have read this make the turbo glow due to the extra work its doing

at the moment the turbo will hold 7psi fine im thinking of doing this in stages so i can get used to it maybe 2psi increments

just wondered what the turbo pro think

 

from what i gather from ukmkivs, std boost is 0.6bar, remapped towards 19psi

 

i just cant see how a k03 can give that much more without killing itself i know people are 20psi which means they have some serious air go through the engine hmm air box like a dustbin lol

 

Mine was 1.2 Bar, think thats around 18psi, seemed to cope okay.

 

a standard ko3 turbo will run .6bar of boost which equates to 8.7psi but there are people running upto 22.5psi on a stock turbo which will definately reduce reliability and life of the turbo.a ko3 with a ko4 compresser will run slightly higher boost at .8bar.the 22.5psi i think is only the peak boost level and i doubt the turbo will be able to produce this amount of boost for sustained periods.i reckon anything over 1.5x the standard boost produced by the turbo is pushing your luck really but you should be safe with 2psi increments.let us kno how it goes

 

Agreed with this.
According to the maps I have on this, 22+ psi would be the boost level at a certain engine air flow rate (3000revs) that is still shown on the K03 compressor map 180,000revs to 200,000 revs. Rev that motor to 5500- 6000 revs and you find you are off the compressor map both for compressor speed and efficiency.
Might be better off using a slighty larger K04 unit and boosting to 2.0 pressure ratio (1bar) and have the flow rate over the rev range without over speeding the compressor and in a decent efficency island 70-68%. Else use a bigger unit like a GT28RS, TD05H or VF22.
These little turbos are really for a low down torque in a small motor that is used in a 1200-1500kg application and driven by your grandmother.
Die hard VW nutters should use a proper turbo or keep boost levels sensible to give efficient air flow.

 

really!

 

apparently so,you said you gathered that they did,i was just confirming that and going on to say a bit more

 

My old AUM (KO3s) was mapped by Jabba to 1.35 bar which is 19.5psi

 

cheers guys well ill see how it goes i want reliabilty but also performance but blowing a turbo up isnt a option are the k04 and k03 compressors inter changable then??

 

im running 20 psi quite safely on a ko4,not sure what the compatibilty is with the ko3 mani.but i think its defo the way to go,also i think a ko4 will hold boost longer than a ko3 but dont quote me on that as i am no expert.

 

hmm

im realy interested in knowing what can be done to a ko3 turbo you say a ko3 with a ko4 compressor this some kind of hybrid thing what elso could be done to the ko3

 

in essence (sp?)a K03 with a K04 compressor wheel is a K03s.as the K03s and the K04 both use the same compressor wheel,the big difference between the two is the size of the turbine wheel and/or (i cant remember which) the housing.there are however different rated K03 turbos availible with varying actuator pressures,found this whilst looking at an american site,hope it helps
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

 

use of the word 'gathered' was as not to try to claim info from their site as my own.
I was never in any doubt of its accuracy.

 

cheer guys all this info is very useful indeed

 

re-read your 1st post and yeh it does read like that,just dont see the need in you putting really!.was just giving ben_cab some info,does it matter that i said the same thing as you?

 

Useful information golf_1.9.

 

k03s and k04 use same compressor?
you 100% sure about that?

 

from the research i have done,yes.

 

The ko3s limiting factor will be the exhaust flow past the turbine wheel, fit a bigger one you'll be able to gain more BHP as you can flow more exhauist gases through the turbo (i hope that makes sense lol)