I'm turbo, stock B16, Eagle Talon TD05H-14b turbo, 550cc injectors. Tuning on Crome Pro.

I started with the provided offsets for my RC injectors. Adjusted my overall offset till things were close. When testing AFR vs Batt Voltage/Load I cannot get things to stay the same..

I've got it set so at idle I'm 15.2afr (@ ~14v). On idle, when I introduced load, it went lean, ~16afr @ ~13.7v. So I adjusted the offsets table till idle was consistent 15.2afr @ voltages between 12 and 14.

Problem is, when driving at a constant speed at a constant rpm, and load is introduced, it still wants to go lean, sometimes as much as a whole +1 over.

Why? I'm looking for clues.

Alt-C is disconnected.

Thanks for any help!

 

So I got to do some more testing recently. The ECU isn't reading the voltage correctly. I'm reading 14.2-14.3v on the multimeter and the ECU is reading no more than 14.06 in Crome's datalog. Once voltage falls below 13.9 it becomes accurate.

So I'm thinking if the ECU isn't reading it accurately, it's not adjusting for the offsets properly.

What detects the voltage in the ECU? P30 capacitor C27? (P28's C14). A diode? And from what pin does it detect the voltage? IGP1/IGP2 or maybe VBU?

Any ideas???

 

If your ECU isnt seeing the same battery voltage as you are reading at the battery terminals, most likely you have a bad ECU ground or you need to clean your grounds.

 

Thanks for your response. I did clean the thermostat ground, and saw no change in behavior. But, I did a wire tuck myself.. So, I'll do more testing in that department.

Wiretuck was done years ago, and didn't notice anything odd before, but didn't have a wideband hooked up till I installed the turbo recently.

Appreciate the help!

 

In this case should I focus on PG1 and PG2? LG1 and LG2 don't appear to drain voltage like PG1 and 2 probably do. Inability to drain the voltage would basically be resistance and skew the reading?