Couple weeks back I had a 1052-U installed and tuned in LA. Today I disconnected the Primary and secondary O2 sensors, connected the AEM Uego Wideband sensor and turned on O2 Feedback. When I hooked it up to my laptop and went for a short cruise, the A/F ratios for O2 #1 were always right around 14.7 under partial and ~60% throttle conditions. Is this normal?

 

I can tell you a stock pcm equipped car will run 14-15:1 at the same conditions.

 

Something isn't right...A/F ratio is often at 14.5-14.6 at WOT, too. Engine Load (PSi) is always at -14.4. A/F target varies, but the actual A/F ratio rarely synchs with it.

What's going on here?

Running 1052U w/the O2 Feedback on.

 

Reread your post. The load should vary significantly with RPM and throttle position. If it does not vary and your O2 sensor reading does not vary, you may not be connected properly. Why not run the WBO2 all of the time? Did they tune with closed loop feedback from the WBO2 enabled?

tim

 

Disable closed loop O2 feedback and see what your WBO2 readings are. That should give you a good indication of how well it is tuned.

Tim

 

Thanks for the reply. I'll disable the O2 feedback and see what happens.

Other weird thing--A/F ratios don't seem to vary much in 1st or second gear, but in 3rd and 4th they drop to 'reasonable' levels when the load/RPMs increase.

I had it dyno'd (they dyno'd in 4th gear) and the A/F ratios of their sniffer read 11s and low 12s....should mean that I'm good in the other gears, but for some reason I'm still showing 14s at WOT in the lower gears.

 

I have also seen up to 1 point leaner a/f ratios in first and second gear versus higher gears. I would suggest enabling knock feedback with a good table and monitoring your knock volts, knock retard, and knock added fuel in addition to RPM, throttle, load, and A/F ratio. If the a/f ratio is good in higher gears and it doesn't knock in any of them, I would call it good. Sometimes, the difference in A/F ratio between gears can be caused by excess fuel added after the ECU detects knock... Good luck.

Tim

 

I would also read a post over in the general tunning section of aempower.com from there forum. They talk about how alot of guys were getting reading that were 1-2 numbers higher than what really was because of bad wiring. You have to remember that these sensors are checking for .1 changes so are very touchy to where you ground them, what you ground them with, and how clean a power source you give them. I would go read the post over there. Really great info to be had there if you havn't started your reading over there already now that you own one. Shoot, I don't even own one yet, and I have spent hours over there just trying to gather up as much as I can. Take your labtop to the squater and spend some time over there in the AEM Forum. Its worth it for not only your cars tuning, but for healthy bowels as well. :-)

J. R.