SwooshMan

Is anybody sucessfully datalogging AFR's from a wideband with an LT-8? I'll be getting the PLX M-300 here shortly and PLX's support guy explained how to convert the linear 0-5v output to 0-1v. Assuming the lt-8 can handle a Linear input i should be able to datalog the AFR's. The question is can the LT-8 use a linear 0-1v input. Have any of you had sucess datalogging wideband afr's with your LT-8 series? Whats your setup if you have? Thanks.

Trav

Okay, I know you're looking for concrete answers, but here is what my research has revealed. Take it w/ a grain of salt until someone concrete can answer.

The LT8 can read/log 0-1v input. So if you can send an output of that, you're golden. Do a few searches on datalogging and I think you'll see the same results. Has anyone actually done it w/ the same model as you? Dunno -- but again, I think the key is getting the 0-1v.

good luck and let us know.

SwooshMan

Yea i've pretty much come to the same conclusion as you have. The problem is i havent found any concrete answers as of yet. I emailed Tim w/ microtech. He should be able to give me a definitive answer. To get the 5v output down to a 1 v output you use 2 resistors(according to PLX). I can't get over the price of the PLX M-300. Its only $329 with the bosch sensor(only $60 to replace it). They recently started making a Gauge that looks almost exactly like the AEM one and if your using the poopy Autometer gauge they make a little adapter that makes it very accurate.

dag

It all depends on the Widebands output. I know that TechEdge's older model would only output rich, stoich, or lean voltages and nothing in between. If your Wideband actually outputs correct voltages you're golden. I can datalog my LM1 just fine.

Trav

Dag, I think the key is the linear output. Any non-wb sensor will output 0-1v but is not linear (i.e. not as accurate outside of stoich). However, the newest TE claims to have a more linear output -- this is the route I'm going. Car is not together though, so I can't say for certain.

SwooshMan

Tim at microtech said you have to have a microtech that can use a uengo wideband(lt12's) to datalog wideband o2. DAG are you using an lt-8 or lt-12? Thanks.

Trav

Clarification, to log a TRUE WB signal (0-5v), yes, you do have to have an LT12. But as I said, the LT8 has datalogging on it too, but is only for a 0-1v signal. But if you can get a wb to output a linear 0-1v signal, the idea is you should be just as well off.

surfpac

I'm almost certain that the Innovate LM1 has a 0-1V linear output that can be hooked up to a regular non wide band sensor. So why not use this signal to datalog. Can this be done?

Trav

Yes, that's what I'm trying to say. From everything I've ever read and heard, the LT8 will datalog ANY 0-1v signal. That's regardless of whether that is WB or NB, linear or non-linear. What I'm suggesting is that for accuracy, you should shoot for a WB with linear 0-1v output.

dag

That's exactly what I was saying, old techedge is a 3 step output, not linear.

dag

Yes, read my original post.

kabooski

right now I'm deciding which WideBand to get

1)LM-1 with the Aux input box(boost,EGT, TPS, RPM, water etc)
2)PLX M-500 wireless
3) Zeitronix ZT-2

I'm leaning towards # 3 right now cause it has a kick *** display and
you can dis-tach the housing and place the LCD screen in a custom housing
I emailed them if they have a linear 1v output
heres the reply:

"The 0-5V output isn't linear and it represents the natural transfer function of the wideband Bosch LSU sensor.
You can scale to 0-1V using two resistors provided up on request."

SwooshMan

I basically asked PLX if i could get a 0-1v linear output from thier M-300 for datalogging with my Microtech and this is the response i got.

"Thank you for your interest in our wideband oxygen sensor controllers. Microtech ECU users are using our M-Series wideband controllers with a voltage divider. The voltage divider consists of 2 resistors which divides the voltage by 5. You can achieve this is a 1K ohm and a 4K Ohm. You don't need to use the NB->WB converter to make the integration. This will allow you to map 0V - 10AFR 1V -20AFR (Linear) Instead of 0V - 10AFR 5V -20AFR. I can better explain this to you over the phone if you wish."

surfpac

Yep, I like the Zeitronix unit as well.

surfpac

Hmmmmm, that's interesting. More details, please.

Crusader_9x

i got the m500 wireless dataloging model and hooked up the linear output to the microtechs o22 input just to see how close it is. the farther away from 14.7 u get the farther off it is. like when the wideband displayu reads 10.2 the microtech will read 11.something.

chris_stampe

Yes, the microtech is not set up to convert the 0-1v signal to afr's in a linear fassion. It converts it based on what most narrow range o2 sensors have for output voltages. So it will give you and accurate reading at 14.7 but the farther you get from that the farther it will be off.

73828793

any details on how the 2 resistors will be wired in?

chris_stampe

Arent you reading^?
A 0-1v output will not give the microtech the correct signal. It needs to see a curved signal.