What the hell am I doing wrong!!! Chrome Tuning

[DrGonzo]

My worry now is that with the heat being the way it is, high 90's and 100%+ humidity, I'm sure it's really not the best time to be tuning the car. I'll be at BRG later on this week so hopefully the mountains will be cooler to tune the car on.

[Greg E]

My worry now is that with the heat being the way it is, high 90's and 100%+ humidity, I'm sure it's really not the best time to be tuning the car. I'll be at BRG later on this week so hopefully the mountains will be cooler to tune the car on.

Sure you can. After the car is dialed in, the only thing you change from there when the weather changes is the air intake temp correction. Leave the fuel map, leave the timing map, only change the values in the row to match the temps you're seeing. Then you can correlate the rest of the temp range based on those two data points.

Things like humidity and intercooler heat soak aren't things you can tune anyway so that variance is always there no matter what.

[DrGonzo]

Took the car out for a test drive today to see how the brakes felt after the new rotors where installed. about 15 min in the engine just shits itself, sputtering, backfiring and popping then dies. Engine basically flooded itself out for some reason. Won't start back up at all. pulled off and had a friend pick me up. Got the house and hooked up the trailer to go get the car. We get back and I go to start and it starts up, roughly at first but catches itself. I'm feeling luck as I think I had finally gotten the BSLCD working "Swapped to the older chip stopped the lockup issues" and I had the TFT logger running and logging. Get home and everything put away, go to check the log and the data in the logs is all sort of fucked up.....



GonzoLog4.zip

So no clue what the hell happened, I haven't touched anything on the car besides the brakes. The tune has not been changed at all. So why out of nowhere does shit like this happen. No CEL, No nothing.

Only changes I have made to the chrome tune at this point is the VE table and that was months ago.

[Jesters Deadd]

Wow. Those numbers are crazy.
I am going to guess its an issue with your sensor ground.

[DrGonzo]

Yeah the numbers where an issue with the BSLCD feeding the TFT logger bad data. Already spoken to Antero about it and are working things out with it.

As far as the car, I narrowed it down to the rear O2 not cycling again. Wiring was all good, power and grounds all good. So I went and swapped the O2 out under warranty. Got the new one in and it was still dead. The car sat and ran for about 30-45 min and then out of nowhere the rear O2 started cycling again and everything was fine. I hadn't touched anything on the car as I was looking online for answers and still trying to pack for BRG. Ran some more tests and I think I narrowed it down to something with the trims causing the rear to cut out. Once I turn off long term trims in Chrome the O2's cycle as they should. So there is something in the ECU that is ignoring the O2 for some condition. For the time being I am leaving Long Term Trims off. The car runs better and I'm tired of trying to tune around those damn things.

[Greg E]

Been saying for years that you can tune the car to run better/smoother and consistent with out any narrowband feedback at all.

When tuning with Ethanol, you end up needing to do this anyway.

[starquest]

good info

[DrGonzo]

Well I guess I should update this, So I continued to have issues with the rear but just dealt with it as the car was all being torn down and rebuilt anyways. So last week while doing some minor logging on the engine since it all was put back together and still had the same issue, this time I noticed a problem, and it was the plug. it seems the signal wire spade in the plug was not making good contact. Seeing as I had repaired that plug multiple times already I just replaced it. With the new plug on the rear has not cut out on me once. So technically the wiring was good, it was little the plastic plug causing a bad connection which I could not replicate using the leads on my MM. :P