sorry if you are using a wideband then those results are accurate.

 

Maybe his engine is just wore out....a supercharger on an engine not built for supercharging and track event in the hot Florida weather....

Dog have the engine looked over, leak down test and other things. Check the compression ect.

 

Please tell me how to wear out my supercharged 996 engine. I have done everything possible to encourage the engine to grenade but, so far, it hasn't. Maybe I should fill it with Mobil 0W40 to help it along?

 

Dog: I assume you have already checked that your aftercooler pump is running and water is circulating?

 

Yep, the pump is humming right along.

The readings from the pasted charts are from my wideband sensor. I wish the damn RPM pickup hadn't gone haywire on me. As an FYI, on the 3rd gear, I didn't realize I had done it at the time, but I did lift slightly on the throttle due to potential traffic. I didn't think I let off, but the charts don't lie.

 

So, you visually confirmed that the water is circulating at a good pace by removing the filler cap?

Could you be having a problem wth the wide band controller?

 

No, funny you bring that up. I just thought of that after I posted. All I did was turn the key on and listen for the pump. I need to go take the cap off and make sure the fluid is moving. The intake air temps are generally fair low though. Not too much higher than ambient temps under normal driving conditions.

Would do you mean by a problem with the wideband controller?

 

How are you measuring your intake temperature AFTER the cooler? Your scanner only displays the MAF sensor temperature sensor.

Your wide band controller may be transmitting incorrect convertion signals to the computer. That would explain the difference between what your computer shows on your aftercat sensors and the sniffer at the dyno. That is, unless your wide band sensors are just for gauge and not signal to computer.

 

No, temps are being measured at the MAF via OBD. I don't have an extra sensor.

What would you do about the wideband controller and how do you diagnose it?

My wideband AF sensor says the AF ratios are just fine. I'm so confused at this point

 

Are you still using the stock O2 sensors for computer input?

 

Yes, stock 02 sensors. I don't think they've ever been changed.

I added the wideband AF sensor when I did the supercharger. If I remember right, the wideband AF sensor is post header and pre-cat. I only have it on one side.

 

Ok. Never mind then about the controller. However, you data shows you running leaner than your should be as reported by your after cat sensors. Voltage should be 0.89 and above at WOT near redline.

 

So, do we pay more attention to my 02 sensors or the wideband sensor? Or could the 02 sensors be faulty and forcing the ECU to do weird things? Ugggh. My mechanic skills are pretty limited to adding fuel and adjusting tire pressures

 

That sounds about right. Since the engine is Rear engine rwd with assuming equal length shafts the power loss would be closer to 5-7%.

 

I guess you missed the part where we just dyno'd the stock 997S in this thread 2 days ago. It's best run was 338.