FDLS6

iTrader: (4)

I would like to feed one of the rear O2 sensors up to 4 volts so I can datalog (with HP tuners product). Does anyone know if the stock computer would tollerate that, and/or if the hptuners product would accept 2-4 volts. I'd like to use a wideband output to feed it. Thanks in advance for any thoughts
Bryan

66ImpalaLT1

It wants to see 0-1v, but it may show more if you delete the high voltage code. I'm trying to datalog my wideband through B1S2 but have had no luck so far.

Let me know if you get it to work.

FDLS6

iTrader: (4)

Yeah, i knew it was looking for 0-1... I hope I don't have to go that route. I suppose I could add or subtract from the voltage output from the wideband output by way of a regulated isolated negative regulator.. making it 0 (2.5v) to 1.5 (4v) or somewhere in there.. if not, you can get a convertor to change 0-5v to 0-1v, but I don't want to loose the resolution... As far as the gm/delphi ecu accepting 4-5v instead of 1, I would think it should take it.. I mean it's nearly 0 current, logic level stuff.. I'm just not sure if it would register/record above some hard internal limit... I'd love to be able to keep the wideband resolution somehow, while datalogging all of the other paramaters at the same time..

66ImpalaLT1

I have mine set to 11:1-16:1 AFR for 0-1v, if I ever get it working it should be good enough.

With EFILive I can simply make a calculated PID that multiplys volts by 5 and adds 11.

FDLS6

iTrader: (4)

Thanks for the feedback. My car isn't quite together yet, but am trying to get this sorted before I hardwire it. I'll leave some strategic wiring options open for it I guess.. I suppose I also need to know what the hptuners product can handle. I ordered it last week, and they should be shipping in a couple weeks. Maybe one of those folks can chime in when they get a chance

jimmyblue

iTrader: (11)

I think it's more a matter of the signal conditioning
the PCM does and its front end circuitry. HPTuners
and any other logger only can get so much out of
the PCM, and if it clips / faults on overrange signal
then you just get bad data.

Nothing wrong with a resistor divider to scale down
your 0-4V signal into range. The input will be OK with
a lower impedance drive signal.

Sunset01

66impala, as you recall I was going to do the rear O2 harness too. But someon on this board posted how they used the AC high pressure connector. Just picked up my innovate kit from my doorstep and am going to try that route... You've also seen my post on innovate board about needing a resistor/cap to make it all work.

samz28

i dunno if the ecu has op-amps on the 1V you can fry that portion of the ecu by feeding it greater than expected rail (1v)~

66ImpalaLT1

Yes, without the resistor and cap I get nothing. I'm going to built the circuit tonight and try it.

FDLS6

iTrader: (4)

Any other thoughts? Can the ecu accept 4v at a rear O2 sensor? Or is it limited to 1v? If it can receive over 1v, will one be able to record it with hptuners software?