Hello guys,

i have a 04 996 turbo which i bought slightly used, the previous owner installed Gemballa power kit with a claimed 580 HP, kit includes:

1) Modified ECU
2) K24/K26 Turbos
3) Sport Intercoolers
4) sports clutch/Flywheel

Later on he sold the K24/K26 turbos and Sport intercoolers when someone offered him to buy them when they knew that he was selling the car, so he reinstalled back the Stock turbos (K-16s) and stock intercoolers.

now i allways see 1.2 bar on sixth gear and the car seems to be puling fine and strong, but how safe is it for the stock turbos to be running at this boost level? am i damaging the engine by running this level of boost with the K-16s?

Please advice

 

is it holding 1.2, or spiking there just for a second, and holding 1.0-1.1?

 

1.2 is no problem.

 

It's holding 1.2 . i'm talking K-16s here.

 

Stock K16's at 1.2 bar sustained is well out of their efficiency range and close to overspeed. Kevin, Stephen and others have covered this before...Kevin G

 

thats what I was thinking. From what I've read, 1.0 sustained, and 1.1 peak on the 16's is about all they can handle.

 

So does the car have in theory a modified Gemballa ECU and the stock
K-16's (which are boosting quite high)??

Wow!

MK

 

Wouldnt the mapping in the ECU not be correct?

 

Yes that's whats happening in my case, is this normal or is it bad for the turbos?

 

thats what i thought, wasn't he suppose to reprogram the ECU since he has swapped from the K24/K26 to K16's?

 

0.9- third gear
1.0- fourth gear
1.1- fifth gear
1.2- sixth gear

 

OK...I'm a little confused here...My boost is not gear specific. I can achieve the same boost in all gears (notthat I would want to). BTW, how fast are you going with 1.2 boost in 6th gear. You are beyond the useable power of a K16.

 

There is no risk to the turbos in principle, the worse that can be happening is to have performance levels drop. Changing the turbos and IC and keeping the same program is nonsense.

You can boost 1.2 Bar without issues on K16s on a 996 engine but I doubt you are gaining any performance beyond 1.1 Bar sustained, in fact it could be the opposite. The maximum you are seeing is 490-500 hp at the flywheel.

 

Hmmm... People who build turbos for a living have said that overspeeding a K16 is a risk....in principle of course, maybe even in reality.Kevin

 

Hmm..I am sure people who build turbos for a living know what they are doing most of the times, in principle, and maybe in reality too, but a K16 at 1.2 Bar is not overspeeding badly yet unless something is wrong with something else. Compressor efficiency is dropping at those levels so the turbine works harder but once air intake temps get affected the ECu will pull the timing and back out the pressure through the WGs and reduce the spin RPMs.

But in fact you even said it yourself below, they are close to overspeeding, but not there, so where is the risk on the turbo?
What do you mean by well out their efficiency levels at 1.2 Bar and more importantly how does that address the risk to the turbos question by the original poster?