Ok, I just got my Innovate LM-1 wideband system working, except the RPM, not sure on how to set that up yet. but here is a graph of my AFR curve, very rich untill about...4800rpm.. I can feel the power let off, and not be consistent... then I went back and looked at my afr, and it looked like this... lean spikes... what does this mean? knock sensors?......i have no idea... I'm going to be starting to do more indepth tuning once i get the rpm working right. this pull was in 2nd gear by the way

Without a corresponding rpm scale, there isn't much we can see from that graph. Are you getting any ignition break-up? A miss will show as a lean spike (you might think unburnt fuel would show rich, but the w/b sensor looks at O2 readings so unburnt fuel means unused O2...)

I just talked to a worker at sound performance, and he said it's more than likely because i was in 2nd, and there wasn't enough load.

But yea, i haven't been able to get the rpm to work right with the LM-1, if anyone could help me... that'd be great. i have the rpm convertor.... and i have a wire going from the same rpm signal as the safc i have.... at the ecu... the safc works perfectly... but it says 0rpm when i log.... i've tried all the different settings for the rpm convertor....no change...

Without a corresponding rpm scale, there isn't much we can see from that graph. Are you getting any ignition break-up? A miss will show as a lean spike (you might think unburnt fuel would show rich, but the w/b sensor looks at O2 readings so unburnt fuel means unused O2...)


How does undburnt fuel mean unburnt oxygen? The wideband measures the oxygen content leaving the combustion chambers.

How does undburnt fuel mean unburnt oxygen? The wideband measures the oxygen content leaving the combustion chambers.


To answer that, I guess we need a quick chemistry refresher. The simple formula for combustion is: HC + O2 = H2O + CO2

That formula states that when hydrocarbons (HC) are burned, they turn into water (h2o) and Carbon dioxide (co2). When the O2 percentage is at a very low percentage in the exhaust, your car is running rich. When the percentage of o2 is at the "normal" level, your car is running just right. And when your car is running lean, there is a high percentage of O2 in the exhaust.

The O2 sensor is just that -- a sensor for oxygen levels. So if you have incomplete combustion due to ignition or compression problems, excess oxygen passes through the combustion chamber without being converted to Co2 or H20. The o2 sensor doesn't know that there is also a high percentage of hydrocarbons -- it just sees the high O2 readings and reports a false lean condition.


**chemistry nuts, I know the formula was not factored and that there are many other elements present in the combustion of gasoline, and that dirty combustion will also result in CO and NOx. For the sake of simplifying a complex process I have omitted as much extraneous information as possible. Flame away :evil: **

Chemically speaking, he would have a low CO, and high HC's out the pipe with a 4 gas tester. If he is indeed lean.

Your IM240 emissions test uses the 4 gas tester(or 5).

IIRC, there are a few RPM inputs that you could use, like 3 injector signal wires and 2 RPM input wires. when i wired in a PLX M500, i used the same wire as the SAFC and it logs RPM... it just needs calibrated now.

there were reports of erratic or non-reading RPM inputs from even the designated wires if there was a poor ground. how are your ground points?

I got it to read rpms finally, I ran a wire to the coil pack, and spliced into the black wire going to the pack. After calibrating, it works. I've done some tuning... got my afr from 9.6:1 to 10.3:1 .... got a lot more to do.I'm probably going to try to hook up my throttle position to this also, that is a 5v signal at the ecu right? i could just hook it up there.....i'm assuming...
not sure what else i could log with the rpm convertor, idk whate else i would want to....

good work mate. im glad you got the RPM's to work. sounds like you tapped into the same wire that the tach uses as an RPM signal.

definitly log the TPS signal, it is indeed a 0-5v signal. the other thing that could be nice, is to install a GM 3.5 or 5 bar map sensor and send the signal directly into the analog input of your unit and you can log boost in relation to AFR and rpm...