...try and keep the 02 around 860mv across the whole band? If not, what should I look for to start out with. I have fuel, intake, headers, and exhuast bolt-ons. I am leaning out a little on the top end, but it seems to work well.

Thanks guys...

 

Forget the O2 reading, go by BLM's and Int. As stated many times here a W/B O2 is the only way to tune by O2 readings.

 

What Morley said.

 

Ok, but if he doesn't have a WB, what about his "do I try and keep the 02 around 860mv across the whole band? If not, what should I look for to start out with?" question.

The narrow band standard sensors on our systems are designed to be rich/lean toggles around about a 14.7 to 1 stoich ratio rather than AFR sensors.

If you kept the O2 voltage at 0.84 all the time, I think you get a Code 45 for rich mixture.

The BLM function means that you should see a toggling O2 from small to large. That's what you should look for.

And by all means, buy a WB to get an idea of the real state of play.

John

 

I'm already looking into the DIY-WB02, I am going to try and get one for the summer time. For now, I was having fuel issues, I just needed to know what to try and tune for. Someone told me to try and keep the 02 around .86, I didn't think this was correct. Since the computer uses the narrow band system, it needs to be fluxulant for a proper reading.

So you guys are telling me to tune the BLMs for 128-132 and keep them there. What should I try and keep the BLs at for WOT/PE%?

Thanks

 

BLM's at WOT mean nothing, they should lock at 128 because the ECM is not using the O2 sensor at that time.

 

Good point, forgot about that. So if the BLMs lock at 128 under WOT, is the scanner supposed to show that? Last time I scanned the car, I had a bad fuel pump and too much fuel with an incorrect chip. Once under WOT, it would show 108, then it would quickly change 5k rpms and up it would show 132.

Since then I had the chip reprogrammed for the fuel pressure and the injectors(SVO 24#), I also got a walbro fp and got it installed this past weekend. I am asking this because, I am going to do some scanning an tuning for the next coming dyno day around D/FW, texas.

Thanks for all the help.

 

Yes the scanner will show them locked at 128 (or there abouts) and you'll notice they won't move.

 

That's what I thought, oh well, at least I am pretty sure that's fixed. I need to get some more scans in before I start programming. I was running so lean when that pump was going, it was showing 70 counts on the knock sensor!!! OMG

Anyway, thanks. I will start tomorrow night. If I have any problems or strange findings I will start a different post.

Thanks Everyone For The Help!!!