I had the old diy-wb controller which was wired to the ecm so I could datalog. After lots of tuning I managed to get my tune close to where it needed to be according to my w-b. The problem was I had to take a lot of SA out for the car to be driveable under light load. When I go WOT from a stop the WB would show 12.5/1 (give or take) but I could see black smoke in the mirror. Normal driving the w-b would show 15 to 16/1 but the plugs show a rich condition.

I figure it was my DIY w-b so I ordered the LC-1 with the O-meter. I got it all hooked up and the O-meter did show the engine running richer than what I had been seeing so I figured I had the problem solved. NOT!!! I also wired the LC-1 to the ecm for datalogging and for some reason the O-meter will so one reading and Tunerpro shows another. Looks like I may not have needed the LC-1 after all.

Now I need to try and figure out how to make my AFR in the datastream show the same as the O-meter. Any ideas?

Dewayne.

 

wat ecm? the way i understand it, there is a offset. ecm and lc1 needs the same ground

 

'1765 ecm. ECM and LCI are grounded together. I'll get back on it Monday, maybe figure out something then.

Thanks

 

Make sure you set the calibrations for both accordingly. I had same problem with EBL and o-meter reading different. The o-meter itself comes cal'd at 7.68 = 0V and 5V =22.??. EBL wanted 0-5V - 10-20:1.

You can always use LogWorks that comes with LC-1 to get a direct reading. LogWorks 3 is out now. I just downloaded it from their website.

 

After checking out this link ://www.eecis.udel.edu/~davis/z28/WB_hacs/

I read the following
"Calibrations were done using a 0v to 4V potentiometer circuit"

According to the papers that came with the LC-1 its default output is 0v=7.35 AFR and 5v = 22.29. the O-meter is also setup for 0v to 5V.

No wonder my O-Meter and TunerPro don't match up. I hate to change the LC-1 and O-meter settings because I feel I'm getting the correct reading and do not want to chance screwing that up. Looks like I need to figure out how to change the bin or TunerPro.

 

To correct the TP display.
22.29 - 7.35 = 15.55
15.55 / 255 = 0.0609803 (use this as the multiplier) +7.35 offset
Should read exactly as the others now.

 

Sounds easy enough, I'll give it a shot tonight.