SD Tuning Step 34 - TURBO 1.4 MAP - Chevy Cruze 1.8.hptreduced.hplAs Found Chevy Cruze 1.8 6-3-20.hpt2012 Chevy Cruze E78 - 12646746.hptHey Gang... Matt here...
I'm working on tuning my 2012 Chevy Cruze manual with a 1.8 and a T04E turbo (internal wastegate set at 7-8 psi). I made a custom log style manifold, increased the stock exhaust from 2.25" to 2.5" with a high flow cat, and straight through muffler. Upgraded to 60# injectors and have scaled the map. There really wasn't much information on them, but the car seems to like the MPW around 1.05. I have switched the stock MAP sensor with a 3bar sensor from a 1.4t. The intake pipe is now 3" vs the 2.5". The MAF sensor is in line, but the intake pipe is really short. I currently have the downstream 02 sensor unplugged and my AEM Wideband in place.
I have attempted to tune the car with a the MAF sensor initially, without much success due to the larger diameter of the pipe. I'm not sure if I need to recalibrate it, or get a different one? I'm new to all this...
I started tuning the speed density route. Got the car fired up with some test drives around the parking lot. Got it cruising around town okay.
Some of the issues I have ran into is the car going into Reduced Engine Power mode. I have attached my latest tune, a log when it went into reduced powered. I have also attached the as found tune, and a Cruze 1.4 tune in which I have copied some of the fuel scaling info, and I have used some of the MAP information as well in hopes to get this thing Dailed in a more.
The other issue I'm having is when I'm logging my user math to get the fueling closer to lambda 1, is some spots go really high, I imagine because it's a stick trans and it's what is being recorded between shifts. I initially would paste special > multiple by half %, and the hit calculate, and the map would go to hell. So I've learned to smooth out some of the areas that just look like way too much of an adjustment. Some days the tune seems like it's getting closer, then I'll have days where my tuning overshot the adjustment.
Here are the engine codes pulling up when the car goes into limp mode.
0x7E8: P0036 - HO2S Heater Control Circuit (Bank 1, Sensor 2) (Permanent)
0x7E8: P0068 - MAP / MAF - Throttle Position Correlation (Pending, Current, Old)
0x7E8: P0138 - O2 Circuit High Voltage (Bank 1, Sensor 2) (Permanent)
0x7E8: P0140 - O2 Circuit No Activity Detected (Bank 1, Sensor 2) (Permanent)
0x7E8: P0420 - Catalyst System Efficiency Below Threshold (Bank 1) (Permanent)
0x7E8: P1101 - Mass Airflow Sensor Out Of Self Test Range (Pending)