So, now that I have my e-manage installed, and I think I've found a wiring map for the US Lancer that will allow me to install the other goodies, I'm looking at a new project: HomeGrown AFR meter.
It's simple. A Bosch LSU4 Wideband O2 sensor from a 2002 VW GTI 1.8L + a digital AF meter from gadgetseller.com = Homegrown AFR that measures voltages.

Ok, great. Now- what are the approx voltages for rich/lean/stoich on the Lancer? Does anybody know?

Thanks

 

Rich/Lean voltages are universal for all cars using our type of O2 sensor as far as I know. Just going off the meter lights I figure .75-1.0 is the green (rich range) .25-.75is the yellow (stoich) and below that red range is lean. It's been stated on here numerous times at WOT (wide open throttle) you are looking for .92 The rest of the time you want it to bounce back and forth from like .2-.8 Im no expert on this stuff this is all from personal expierence but my car isn't blown up yet so I must be doing something right.

 

Did a LOT of research today, and you're pretty much spot on for our 4 wire DENSO O2 sensors (zirconia type). 0.45 is perfect stoich... But, the homegrown AFR was gonna use the Bosch LSU4 wideband, which gives 0-5v measurements. Had to get some info and do some math to figure this one out.
puts out 0-5v. 0v = 10.0:1 AFR, 5v = 20.0:1 AFR. Stoich is 2.35v, go from there


Homegrown probably won't work out too well. . . most of the reading I was doing said that O2 sensors are temp sensitive, and that the reading would fluctuate quite a bit, depending on the a/f meters refresh rate. I don't know thogh. . .
So I have two options: get a REAL wideband and meter (AEM or innovativemotorsports) and get simplicity of installation, all the parts in one box, instructions and probably datalogging on the emanage OR- do the homegrown thing for 1/3 the price, figure everyting out (reinvent the wheel) and maybe have it not work.

 

You can't use a 5v on the stock ECU. It will have NO idea what the **** is going on and I don't even know if/how the car will run.

I still vote fore the UEGO. I paid $360 shipped for mine. You can get them for under $400 easily (which includes sensor kinda obviously). The only thing you won't have a is a gauge calibrated for it. I suppose you could just tape the 1v wire though and do it that way.

 

Andrew you stole my thunder! I was going to post the voltage issue last night but I didnt get around to it. I was watching football and it occured to me and I was like my god you cant use a 1-5v O2 sensor on a 0-1v system, but I just kept watching football.

 

Of course, that was the problem- how to hook it up
Ghostrider's on his way back from SoCal and said he'd plugged his GReddy AFR into the first cat (removed the first O2 sensor and replaced it with the sensor that came with the kit) and it's running fine. . .no lights, no stalling- wtf?!
For the Record- innovative motorsports wideband- nothing to figure out, same price as the AEM ($350) and you can datalog. Worst case is that the ECU DOES rely on the first O2 and I have to drill another hole in my heards.

Thanks for indulging me in my bizarre mind exercises!!