How precise is the A/F reading?
 

How precise is the A/F reading on the screen, with a narrow band oxygen sensor connected?
Could it be used for tuning, or is it just a "fun" onscreen function?

A narrow band O2 will tell you if you are lean, or rich...but it will not tell you by how much. I would never use one to tune a rotary. I'm an old Megasquirt guy, so here's a clip and pic from the MS manual that I like to refer to.
With a narrow band sensor, we can really only tell for certain whether we are rich or lean, but not by how much. If you look at the graph, you can see that for a narrow band sensor, the 12.5:1 AFR required for maximum power can give O2 voltage from 0.8 to 0.95 (depending on exhaust gas temperature), yet this same range of O2 voltages can indicate mixtures from 10:1 to 14.5:1. So we cannot use it reliably to set mixtures for full power. With a wide-band sensor, 12.5:1 corresponds to 2.08 volts, and 2.08 volts means 12.5:1. Thus there is no ambiguity over AFR and voltages. We can measure any mixture in the range we are likely to use, from full power through to maximum economy.
http://www.msefi.com/msinfo/manual/wbvolts.gif
Hope this helps!
-John

Thanks a lot!
Then I just have to buy the Zeitronix I have wanted for a long time....

No problem, glad I could help!
Now I'll shamelessly plug my favorite wideband company: Innovate Motorsports! Check out www.innovatemotorsports.com! ;-)
-John

I have been looking at that.... But no! I like to have the EGT readings on the same display! That's one of the nicest things with Zeitronix...

Yes, their new gauges work flawlessly, and look awesome!

even the wideband on the microtech isn't very accurate.
the last one i did was a FULL point off!!!

what model ecu and what sensor/controller was it using?"

lt12, microtech controller, 6066 sensor.

id say your sensor was faulty,

i use one of them every day of the week and i have compared them to innovate, motec, autronic and they are identical,

are they self-calibrating?

dont have to free air calabrate as such like the innovative,

just install the sensor in the bottom of the dump pipe not directly behind the turbo, these 6066 sensor do not like heat, if you get them hot they will not read well at all

Dale

at least they aren't as bad as the 7057's.

quick question guy's my.. lt12 calls for a lsm11 wb o2 I believe, those run 275 if I'm not mistaken.. and I see that you can find what you call the 6066 sensors for cheap. can these 6066/7057 sensors be run in my lt12 as well... cheaper is better only if they work well...

i didn't know there was an lsm11 option... the only one i've got from microtech came with a 6066.

no you cant use the 6066 with that ecu, you can only use the LSM11

Dale

oh hold up...

i got the controller. are you talking about the built-in wideband?

the controller uses the 6066,

the built in uses the LSM11, if your ecu is a "s" model yuo cannot use a LSM11 on it

Dale

gotcha

Dale,

With the 6066 how far away from the turbo do you recommend installing it? I have the LTX12S and my DP is only about 3ft long it exits right behind the front tire. The car is not for street use it's a track car, no mufflers.

as far as possible.

I understand as far as possible but like I stated my whole exhaust is about 3ft long it is open exhaust. The dump pipe exits right behind my front tire will it be affected if it is to close to the opening where the exhaust gases exit?

i would put it about a 6in from the end and you should be right

Dale

I run my wideband about 6 inches from the end of the pipe and at idle the readings are all screwed up (bridgeport) but with the loud pedal down it reads just fine. Ive installed it farther upstream to be able to compare the results. I keep it farther back and the sensors last longer.

another thing with the LSU4 is they hate leaded fuel by the look of it, my sensor was only a few months old and had done a fair bit of race gas work and it is now reading wacko! replaced it with a new one and it was perfect again,

i would reccomend 20hours tops if using leaded race fuel

dale