18:15 AFR at WOT

Mitco39 · 07-07-2014, 12:15 PM

[QUOTE=redline10000;2886499]Its possible the program isn't 100% accurate but its all I have :-(. The ecu is commanding 18 but the actual afr is around 11 and at redline its at 10.

Its pretty rich for NA, id suggest getting a tune for it to wake it up a bunch. Also I believe that ECU commanding is wrong. If it was commanding 18 it should be doing around 18. Under open loop conditions (under load) the ECU will blindly meet a AFR target based only on the metered air going into the engine. So the fact that it is not listening to that value under open loop tells me that value is incorrect.

redline10000 · 07-07-2014, 03:14 PM

[QUOTE=Mitco39;2886515]

Quote:

Originally Posted by redline10000

Its possible the program isn't 100% accurate but its all I have :-(. The ecu is commanding 18 but the actual afr is around 11 and at redline its at 10.

Its pretty rich for NA, id suggest getting a tune for it to wake it up a bunch. Also I believe that ECU commanding is wrong. If it was commanding 18 it should be doing around 18. Under open loop conditions (under load) the ECU will blindly meet a AFR target based only on the metered air going into the engine. So the fact that it is not listening to that value under open loop tells me that value is incorrect.

Thanks for clearing that up for me, much appreciated. I will look into getting a tune but hopefully I'm good running the car the way it is now. At autox I redline the car a lot so I don't wanna mess up the engine with the car being so rich.

07-07-2014, 12:15 PM	#1 (permalink)
Mitco39 A True Z Fanatic Join Date: Aug 2012 Location: Edmonton Alberta Canada Posts: 2,089 Drives: 40th 370z Rep Power: 132	[QUOTE=redline10000;2886499]Its possible the program isn't 100% accurate but its all I have :-(. The ecu is commanding 18 but the actual afr is around 11 and at redline its at 10. Its pretty rich for NA, id suggest getting a tune for it to wake it up a bunch. Also I believe that ECU commanding is wrong. If it was commanding 18 it should be doing around 18. Under open loop conditions (under load) the ECU will blindly meet a AFR target based only on the metered air going into the engine. So the fact that it is not listening to that value under open loop tells me that value is incorrect. redline10000 likes this. __________________ 2007 Chevy Duramax - EFILive Tuned By Me 2010 40th W/ Nav - Boosted Performance - UpRev Tuned By Me The Mrs. Ride -2012 335XI N55 BMW - Cobb Tuned By Me, Built by her My Build --> http://www.the370z.com/members-370z-...39s-build.html