Trax 1.4L question about DTC changes

[tonybalogna]

Hi group,
I am new to tuning. I recently had to make changes to my DTC due to having a larger turbo in order to turn off my MIL for smog. I changed P0234, P0243, P0245 and P246 to no error report. My MIL has turned off since the flash. I have not made any changes to my stock tune other than those and I noticed an increase in performance. I suspect is is due to P0234 (Overboost condition), which was an error I got frequently after adding the larger turbo. My question is, what dangers do I run into with these changes. I have not tested the changes on the freeway but I wanted to ask the community for advice to see if I risk any dangers with these changes. Any response will be appreciated.
I have stock injectors, CAI, and HP ignition coil, with a stage 2 turbo 55mm.

[tonybalogna]

I attached my log file and my smog stock file just in case anybody is interested or wants to discuss more. I plan on disabling drivetrain abuse/trans abuse after I get the car smog, just waiting for the O2 sensor to become ready. Any advice will be appreciated, thanks.
2.hpl
smogstock3.hpt

[shartwig.27]

Hi group,
I am new to tuning. I recently had to make changes to my DTC due to having a larger turbo in order to turn off my MIL for smog. I changed P0234, P0243, P0245 and P246 to no error report. My MIL has turned off since the flash. I have not made any changes to my stock tune other than those and I noticed an increase in performance. I suspect is is due to P0234 (Overboost condition), which was an error I got frequently after adding the larger turbo. My question is, what dangers do I run into with these changes. I have not tested the changes on the freeway but I wanted to ask the community for advice to see if I risk any dangers with these changes. Any response will be appreciated.
I have stock injectors, CAI, and HP ignition coil, with a stage 2 turbo 55mm.

the dangers you risk running is if for some reason the boost controller fails or one of the MAP sensors fail, you could risk overboosting the car, running the engine lean and causing damage to the engine. you could cause a head gasket failure, burn a hole in a piston, torch the head along with the head gasket. my sonic is a full bolt-on car with 42lb bosch injectors tuned for 20psi of boost on 93 octane fuel. I'd say you need to re-enable your overboost and underboost codes and actually tune the car for the increased power it has the potential to make. I will let you know that the fuel injectors are gonna run out at about 16-17psi of boost with that turbo size most likely, id say dont let the injector pulsewidth get higher than 18ms, or if you are logging injector duty cycle, dont let it exceed 90%. If you want to truly increase the boost reliably you need to use the max torque and engine torque tables along with the driver demand tables to get the car to make the boost and airflow you want. There is one table to watch for, the MAX VE under Engine>Airflow>Turbocharger. You'll notice that if you don't properly adjust this table, the car will not hold boost at the top end of the rpm range, around 5000rpm the boost will fall off and the throttle will begin to close. And if you have the ability to, be sure you are running a wideband so you can be sure the car is not going to run lean at any point.