Road tune

Mitco39 · 06-29-2014, 12:22 PM

Quote:

Originally Posted by DOOMMONKEY777

Yes i have the same problem with a/f ratio differential .5, and also have a massive oil cooler located on driver side. I was able to fix it by adjusting cylinder trim on 2,4,6 to 104.69 which got me to get rid of that diff, but i believe the problem is not the oil cooler at all, its has to be something electrical from the factory (wires are longer on one of the bank than the other therefore voltage drop, or bad ground. Just guessing here) defect that the factory stock map is tuned for, but not Osiris cuz well they didnt design the car they just trying to make it look like that they know what they r doing. All though i believe that this engine can have its butterfly valves removed and use vvel banks adjustments to let certain amount of air in (cuz vvel can operate on how much u want it to open the cam valve in order to let certain amount of air in to the chamber in order to have a desired a/f ratio) it will be awesome, but Osiris is working on it.

Can you confirm that this is still working for you? I was logging the car for a good 6 hours yesterday and tried the same sort of thing as you, only I removed fuel from 1, 3, 5. It worked for about 5 minutes until the car for whatever reason started addding fuel to bank 1 again. The trim values you speak of only seem to work for a bit before the ECU realizes that bank 1 should be running richer and starts adding fuel.

I lowered 1,3,5 down to 92% and was still seeing a trim of ~115% and a afr of 13.9ish. From those values you can see that the ECU is adding 15% more fuel than my correction table to make it run rich for no reason. The target AFR for both banks is 14.7.

As I said on another thread this is an issue with the 350zs as well and some guys have fixed it by actually unplugging the downstream 02s and turning the codes associated with that off. I have yet to try it as I am down in Montana on a road trip but when I get back Ill unplug mine and take it for a drive and see if

A. The ECU allows closed loop with these unplugged
B. The ECU stops messing with bank 1 and lets it follow bank 2.

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