Ok so based on what I have researched these cars with stock K16s will make 0.6-0.7 boost max. I’m the third owner of my car and at one point in the last 14 years this car was modified and also had some kind of tune. Anyway because of the new law in California I guess 2-3 years old this car was having to be taken basically back to stock to pass smog. Anyway the owner got tired of this decided to sell and here I am. So as far as I can tell yet to be 100 percent confirmed, this car has what looks like K24s, bigger intercoolers and intercoolers pipes, diverter valves, headers and exhaust. It constantly makes as much as 0.8, I have seen 0.9 occasionally. According to the records the car has a 2.5 clutch. The previous owner told me that a shop tuned the car back to stock. Is it possible that whatever tune was written back on the ecu was something different than the stock. I have measured acceleration a few times and is less than 4 seconds to 60. Yesterday, Friday I actually smoked a 2022 Camaro ZL1 to about 80 mph, that car it’s supposed to be a 3.8 seconds to 60 car. The car had paper plates, maybe a bad driver I don’t know. Anyway any light you guys can shine in will be appreciated.

 

I have K16's with a stock tune and I see 0.8 bar on occasion.
Please remember, these cars don't have a boost target in the ecu. They have a torque target and the ecu sets boost, timing, injection to hit that torque target. If it is really cold it may demand only 0.6 bar to get the demanded torque.
It is very easy to see what boost the ecu is demanding. Just do a datalog and log "boost pressure of sensor" and "setpoint boost pressure" on Durametric - or on Cobb log "Manifold absolute pressure" and "Target Boost Pressure".

No one is going to be able to guess what tune is on your car. Sometimes the tuner writes their name or the name or number of the tune into the ECU. You can check those with Durametric.

 

Thank you sir for the education. I like to know as much as possible.

 

That is correct.

 

i don’t have any boost leaks. So if indeed my turbos are K24s, then this car has to have some mild tune. To be doing 0.8 and sometimes 0.9 boost. I’m in Texas and we are pretty flat, all the gas i Run on my porsches is shell v power 93. You guys are awesome. We will double check which injectors it has and rectify that the turbos are K24s before the next step.

 

Stock K24s will boost 0.8 bar.

 

thanks you know your stuff. As a side question is it true that these mezger stock engines past 1.1 bar boost will bend rods long term?? Jake Raby says so and he has rebuilt 100s of these. I personally know a guy that had this experience with a 1.3 bar tune. Then he spent ****lds of money to do a protomotive 3.9 build.

 

He is wrong...

Hi torque at low rpms can bend stock rods. It is not simply related to boost. It's related to high boost at low rpms with small frame turbochargers. I know many people who have run 1.3bar (myself included) on stock internals for many years without issues. If you have larger frame turbochargers (K24 or similar) with proper tuning, you can run 1.3 safely all day long.

 

The easiest way to confirm if you have K24 turbochargers is checking the casting on the Turbine (hot housing)..
Like the picture below shows the K24 9089 casting number..
These turbine housings have less than 200 miles on them.




The real way to see what is on your ECU, is to "read" the contents.
If you Rev limiter is a 6750, it a highly likely that the ECU is back to stock.
The K16 stock file will allow for .8/,9 spikes when fitted with the K24's.. A boost spike might take you to 1 bar, but this pressure level is not sustained.
The stock programming will "real" in the boost, and power output.
If you have larger injectors, your engine will be running RICH and CEL's should be present.

 

This.

 

Agreed! Also, 1.3 bar doesn't mean you see 1.3 bar at low RPMs - ideally you want a nice flat torque curve across the rev range, and usually you have to ramp boost as the RPM rises to keep torque up (depending on timing, etc.). In my setup, I hit 1.0 bar midrange, but ramp to 1.3 at the top end, and get a pretty flat 530-540 ft lbs up to 6750 rpm.