RED

I have read that the turbos on the S4 are the same KKK KO3 on the A4 and that they are producing 16 psi. Is this true? If so does this mean that the KKK KO3 in the A4 is able to withstand 16 psi on a consistant basis?

Vijay

1. Yes 2. I guess so

LCP

That would be 8psi + 8psi (2 turbos), but I'd bet they have to make closer to 9/10 psi

Jim De Arras

This makes no sense! Each one would make the full pressure for it's own 3 cylinders.

LCP

I didn't say it was correct or made any sense (b/c I know it doesn't), but R&T doesn't seem to know

Steve

Yes.. it can EASILY handle 16, 30PSI,,. but!!! the question is how much volume does it have to suply at that pressure. ITs not pressure that kills a turbo it how fast the turbo has to spin to make that pressure. Therfore teh lower the VOLUME the less spin. Sure pressure has a lot to do with turbo RPM too but for a given volume Turbo RPM dosent change very much.. increas the Volume tho and watch out.

Corey S

Well, with respect to the turbos, anyway. Yes, there are two turbos, yes, they are the same K03's that are found on the 1.8T, but no, they are not each pumping 16psi. We already well know that the K03 is only capable of up to about 15psi, and that is near the limit. There's no way that Audi tuned the 2.7TT so that each turbo was running at the limit.

I'm guessing that each turbo is pushing about 8psi (the 1.8T runs 7psi stock), which is 8psi in each of the two intake manifolds. Or you could say that each cylinder bank has 8psi. How can you add these two together and get 16psi?? They are separate!!!

Another note, if each K03 was already pumping 16psi, than a chip wouldn't get us much horsepower. We already know that the S4 chip is getting huge gains like the 1.8T. Probably taking max boost from approx. 8psi to 14.5psi.

Corey S

RED

Each would make full pressure, but would not have to flow as much (i.e. spin as fast) to attain that pressure. So the choke point is the limiting factor not the pressure.

Steve

can you imagine running MAC truck on a K4 turbo at even 2 PSI?

eliot

according to some news release on audiusa.com
the US S4 develops only 7psi. i think the
euro version puts out 10 or 11 psi.