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Start Up Fuel

Posted: Sat Mar 21, 2020 5:15 am
by schaffertnathan
I'm just wondering why warm start is so lean, if there's something I should adjust in my map. Cold start seems perfect, just warm start is showing high fuel trim. Someone please take a look. Thanks! 2012 Civic Si

Re: Start Up Fuel

Posted: Sat Mar 21, 2020 9:54 am
by Hondata
The hot fuel trim is +25%. Not sure what injectors you have or how you tuned them but I'm going to guess that your injector size and dead times are part of the problem. Your entered dead times for a 1000cc injector are less than stock.

Cold start is lean too but since the injector duration is much higher the dead times don't have as much affect. eg if the dead time is 0.1ms low, then at 4ms that's only a 3% error but at 1.4ms that's a 33% error.

I'll guess you have ID1050X so use their dead times, which are too low as they are measured electrically not by flow, and then bump them up a little at a time until your hot fuel trims come right.

Re: Start Up Fuel

Posted: Sat Mar 21, 2020 10:11 am
by schaffertnathan
Yeah I do have the ID1050X, the dead times are set to what Injector Dynamics provided. I will try that out and see if it helps! Thanks