LS1TECH > LS1-LS2-LS3-LS6-LS7 PERFORMANCE > Nitrous Oxide > How to set up a/f shutoff? PDA View Full Version : How to set up a/f shutoff? pHEnomIC06-05-2009, 01:45 AMOk I ran through my setup to make sure all my spray stuff is working correctly. Right now i have torquer v3, full boltons, racetronix, green tops, HSW wet plate kit, tr-6s. I just put a warmer in and have all the safety stuff. I am running 12.8 a/f and 23* timing n/a. I have the recommended jets in for the 75 shot. The timing on the 75 shot is 20* and whatever fuel it adds itself on top of the 12.8. What should I aim my a/f to be and how should i set up my a/f shutoff? I believe i can set rich cutoff, lean cutoff, and time to cutoff in tenths of a second. Whats the best rpm to start the spray? I think i have it set for 3500 right now. Im gonna learn to read plugs to fine tune things. pHEnomIC06-06-2009, 04:27 PMbump please NVR_SPDS06-07-2009, 03:36 PMHit up one of the HSW guys on here, theyll be able to lead you in the right direction. pHEnomIC06-07-2009, 11:36 PMOK so I have a p series nitrous gauge with the a/f shutoff and a plx wideband. I have a harris speed works wet plate kit up to 150 shot. Ive been told my a/f should be between 11 and 12.5. I see the gauge's formula for analog in is a/f=2*volts+10 and the plx gauges output formula is a/f=2.5volts+8.75. I calculated it out and it looks like the plx will give off 1.5 volts for 12.5 and .9 volts for 11. So does that mean i should set my a/f cutoff at 11.8(.9v) and 13.0(1.5v) on the gauge and then make the delay 3/10s of a sec. Or should I set it up differently? Rick@HSW06-08-2009, 11:08 AMOK so I have a p series nitrous gauge with the a/f shutoff and a plx wideband. I have a harris speed works wet plate kit up to 150 shot. Ive been told my a/f should be between 11 and 12.5. I see the gauge's formula for analog in is a/f=2*volts+10 and the plx gauges output formula is a/f=2.5volts+8.75. I calculated it out and it looks like the plx will give off 1.5 volts for 12.5 and .9 volts for 11. So does that mean i should set my a/f cutoff at 11.8(.9v) and 13.0(1.5v) on the gauge and then make the delay 3/10s of a sec. Or should I set it up differently? Give yourself a bigger window than that for the rich end of the spectrum. Honestly, everyone's car will be set up different so there won't be any 1 program that fits everyone's needs. For starters you can try that, but I think you'll have better results opening the rich end up a little. Rick