UPSIZE TO KO4 OR REPLACE KO3
I've got a 2004 A4 1.8T 163bhp,i think my turbo is on it's way out been hearing a low pitched siren like whistling sound,got it remapped about 3 months ago went like a rocket at first but power just faded gradually,now it feels like i don't even have a turbo.Had the following done and replaced with no results.
New MAF,DV,n75, O2sensor and had it tested for boost leaks.......nothing!
Can someone please help me
I was thinking of replacing the turbo with a larger one,is it worth it to go from a ko3 to a ko4 and
if so where can i get it done without braking the bank.
Installed a N75j valve today,massive improvement can actually feel the car boosting now.
will it affect the performance if I extended the hose connecting to the turbo,because the n75j is different to the stock n75.