Got a LC-1 and was wondering what voltage is the ECM looking for? I read the tech article https://www.thirdgen.org/o2tuning and see the range, but could somebody be more specific as to what voltage 14.7AFR should be so I can finish the programming (currently using .850v @ 14.7).

 

The AFR value depends on what type of gas you are using. A sensor reads a certain equilib. voltage for a lamda = 1. The AFR varies with fuel.

Using "normal" gas, a NBO2 sensor reads .450 volts at 14.7 AFR.

 

Thank you! That is what I was looking for! This way I can have the AFR guage and the ECM both running on the WBo2, and the meter won't jump all over the place. The controller can be programed to send signal averaged over a selected time frame (1/3 sec, 1/6 sec, etc).
EDIT: Two programable outputs. One for the meter every 1/3 sec, and the one to the ECM set to instant.

 

What kind of AFR gauge is it? Most of them are designed to use a stock NBO2 type sensor (0-1v, .450 volts stoich). In your case that would use the simulated NBO2 output too.

Keep in mind that "10% ethanol gas" is not normal gas. A NBO2 sensor would read .450 volts at 14.3 - 14.4 stoich. Normal gas would read .450 volts at 14.7. When tuning 10% Ethonal for stoich, you aim for 14.3 to 14.4

 

You're right, it's the cheap AFR guage (doesn't actually have a AFR readout) but it is an Autometer Cobalt (matches the boost/vac guage) and they have a WBo2 AFR guage but don't have the extra funds right now. I just want to be able to monitor somewhat while driving.
We don't have ethenol here yet, so that doesn't apply in my situation (but thank you for the advice )

 

In your case the 14.3 - 14.4 doesn't apply since you don't have 10% ethanol. You will be shooting for 14.7 AFR (.450 v) at stoich. At WOT, I would want to see .9v minimum under boost for starters. Everyone does it different at WOT.......but you want it rich to start. All the Autometer AFR gauges I have seen (not many) use a stock NBO2 input (0 - 1v).

BTW, it is good to hear that you are making a lot of progress with the build.

EDIT: The MS ECM will report the actual AFR so a real WBO2 gauge isn't all that necessary for tuning.
NAPA sells 18mm-1.5 axle nuts for under a $1 in case you want to add more O2 sensor bungs to the downpipe.

 

When the controller is connected to my laptop, wouldn't that be a true WB reading (that is a seperate output from the other two)?
Thanx, but sometimes it doesn't feel like a lot, lol. Still have a bunch of parts that have been collecting dust lately but with a big family it's hard to get out to tha garage and spend a good amount of time in there.

EDIT: I am glad that MS is going in before the turbo so it should be much easier to tune since I was going to try to use the FMU method.