New to tuning need advice: Trying to tune open loop but AFR goes lean

[will_coop]

I have been trying to tune in open loop so that I can dial my MAF sensor in. I have followed the help file in HP tuners for setting up open loop. When I flash my open loop tune to my car it runs very lean ~20:1 verified with NGK AFRM WB and doesn't seem to get much richer. I am commanding 14.6AFR. Does this mean that I am not actually in Open loop or do I have a table that is that far off that it is changing my commanded AFR that much?

Any help would be appreciated, I am new to tuning so I want to find out if it is something that I am doing or if it is my tune.

7.12.14 rx7 MAF ONLY.hptopen loop lean2.hplMaf tuning.cfg

[mecanicman]

I would check your wideband setup, does not appear to be correct.

[will_coop]

What looks off about it? I have the wideband dispaly also hooked up in the car and it reads the same values.

[mecanicman]

you have narrow band o2 displayed and its displayed voltage does not corespond with your wideband displayed afr.

[will_coop]

Thanks for the help! I never thought about relating the narrow band to the wide band. isn't a low mV on the narrow band a lean AFR?

What confuses me more is when I flash my original tune back to the car the AFR drops back down to close to what is being commanded.

Edit - I attached a scan with my original tune showing my AFR and the original tune that I started with.

[mecanicman]

Your narrow band is showing leaner then stoich, but at the 18:1 your log was showing I would expect the narrow band to be at 50 or less mv. I Suggest putting it back into closed loop and using stft to dial in maf.

[5FDP]

This might help.

http://michigansnowmobiler.com/hptun...ons%20rev2.pdf

[will_coop]

This might help.

http://michigansnowmobiler.com/hptun...ons%20rev2.pdf

Thanks, I will follow that guide and see if my results change.

[Russ K]

Turn off the AIR pump.

Russ Kemp

[mecanicman]

Turn off the AIR pump.

Russ Kemp

Interesting, would not have thought of that. Is it not already off? Disable temp is 14 and log shows running at 185?

[will_coop]

Do you mean the air pump for the emissions system? If so, I have the engine in a mazda rx7 and there is no emissions systems on the engine any longer.

[RonSSnova]

Is this engine stock?
If so, it should run pretty well on the stock tune.
Did the ecm come with the engine?

I don't see in your 2nd log that you are logging both O2 sensors. Or stft. Not really even clear if it has gone to closed loop. Irregardless of the tune.

[will_coop]

The engine is not stock. It has an ls6 intake, ported throttle body, tsp 228r 112 , and long tubes.

The ECM did come with the engine and I sent it to a well known tuner for a mail order tune when I installed the cam. The only thing I have added after the cam was the ls6 intake.

I am going to be switching to an ls3 air intake and maf but I wanted to get familiar with tuning before I did the switch.

[WS6FirebirdTA00]

If your tunes change the fueling that much and the only real difference is OL vs. CL. Chances are your base tables are off and the car is just compensating. I did not have time to look at the logs, but how much have you been increasing the MAF table to try to compensate for this?