getZ Posted May 2, 2006 Share Posted May 2, 2006 Anybody ever use one of these wide band O2 sensors? It's the one Summit Racing sells. I let the thing run through it's self calibration to atmosphere and then hooked it up to the car. My issue is without the car running the sensor is saying 10.6%. It seems to respond with idle mixture adjustments (this is for a carburated car) from 12.7 to 13.7 percent while leaning the idle adjustments so it looks to be working, but 10.6 with the car off? What gives? Quote Link to comment Share on other sites More sharing options...
spork Posted May 2, 2006 Share Posted May 2, 2006 try re-calibrating the sensor in free air (take it out of the exhaust). You may need to un hook the senosr and force it to do a heater calibration as well. Quote Link to comment Share on other sites More sharing options...
Hugh Posted May 2, 2006 Share Posted May 2, 2006 Is it the Innovate Motorsports LM1? Quote Link to comment Share on other sites More sharing options...
getZ Posted May 2, 2006 Author Share Posted May 2, 2006 yes it is an LM-1 http://store.summitracing.com/partdetail.asp?autofilter=1&part=INN%2D3723&N=400587+115&autoview=sku What do you have to do to recalibrate, remove the 9 v battery? Quote Link to comment Share on other sites More sharing options...
spork Posted May 2, 2006 Share Posted May 2, 2006 well, read the instructions...lol. seriously tho...I can't remember the exact procedure but for the heater calibration you have to revomve the sensor and wait like 20 seconds and then hook it back up and it will atuo re-calibrate...but check the instructions for the exact proceedure. For the free air cal, just have the sensor out of the exhaust and press the calibrate button on the LM1. Quote Link to comment Share on other sites More sharing options...
getZ Posted May 3, 2006 Author Share Posted May 3, 2006 well......the instructions are pretty simple. Plug it in, turn it on, let it warm up (it has a warmup countdown), calibrate to atmosphere and attach sensor head to the car. I will probably call the manufacturer in the morning. It might be okay the way it is. Quote Link to comment Share on other sites More sharing options...
RB26powered74zcar Posted May 3, 2006 Share Posted May 3, 2006 You need to go here to the LM-1 web forum and Claus (the owner) should help you out if you can't find your answer in the older threads... http://www.innovatemotorsports.com/forums/forumdisplay.php?f=4 Quote Link to comment Share on other sites More sharing options...
getZ Posted May 3, 2006 Author Share Posted May 3, 2006 I stumbled across that website last night. There's a lot of good information on that forum. It should make for a good resource. Quote Link to comment Share on other sites More sharing options...
Hugh Posted May 3, 2006 Share Posted May 3, 2006 I have the Innovate Motorsports LM1 as well. To free air calibrate, you can just do it in the morning or after the car has rested for a few hours and the exhaust fumes are cleared out of the pipe. There's no need to remove the sensor unless its easy to do. When mine seems off, I just hit calibrate before I start the engine in the morning. I would only remove the sensor to calibrate if I'm on a tuning session or something. Mine reads typically like 19:1 or something when its in clean air. 10.6 is not right. Unless, of course, thats what you have sitting in the pipe the sensor is in. Do not hit calibrate with fumes in the pipe, it will give some whacked out readings... my friend almost blew a 360hp turbo motor like that. The sensor read rich all the time... so we kept leaning it out more and more. Eventually I figured out the wideband was off. Once we pulled the sensor, free air calibrated it, and put it back in... the A/F was super lean and ready to pop the motor! Quote Link to comment Share on other sites More sharing options...
strotter Posted May 4, 2006 Share Posted May 4, 2006 Your readings may not be that far off, unless the 10.6 (which is a ratio, not a percent BTW) stays some hours after power-off. Your other readings aren't that bad for a moderately rich run; but remember, with a carb, the motor keeps pulling fuel during the spin-down after ignition off. It's only for a few seconds, but that's enough to pull a slug of raw fuel into the cylinders and therefore into the exhaust. EFI's don't do this, because the injectors shut off at the same moment as the ignition. Quote Link to comment Share on other sites More sharing options...
getZ Posted May 4, 2006 Author Share Posted May 4, 2006 Before I recalibrated it was reading around 20. Hit the calibrated button for a couple of seconds and it recalibrates to 20, so whatever happened on the first reading seems to have been a fluke. I started to adjust the idle mixture screws (this is for and edlebrock performer 750) and the o2 sensor stays around 10.4-10.7 until both screws are only around a quarter turn all the way clockwise and I set the A/F around 13.0. This confused me because I thought those screws were air jets and not fuel adjustments. I almost have them closed off (only a quarter turn from fully clockwise) yet the car got leaner? Hmmm....where was that edelbrock manual now. At least that was good to know. My car is failing emissions. Quote Link to comment Share on other sites More sharing options...
Hugh Posted May 4, 2006 Share Posted May 4, 2006 Oh... emissions, sorry to hear that. I'm pretty happy to be out of that racket. Sounds like you got it calibrated correctly now, you can trust it. Just get that carb figured out now. Quote Link to comment Share on other sites More sharing options...
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