S300 with Autometer wideband input. Has anyone done it?

[I Hate Import Cars]

So I have S300 on my car and am running an Autometer Sport Comp wideband O2 sensor, and I want to set it up to where I can run datalogging on my S300. Here are my few issues;

A) When I change from E85 to 91 octane unleaded, I have to adjust the AFR on my wideband (14.7:1 for unleaded, 9.7:1 for E85). First, does anyone know if making that adjustment affects Lambda readings? In other words, if I'm only ever reading Lambda, do I need to adjust optimal AFR when I change fuels? Or is Lambda the same across the board? Also, based on that question, is there a difference in the 0-4v output from the gauge when I adjust the AFR?

What I'm really trying to sort out is this; I have an E85 tune and a pump gas tune (obviously different files). I want to know if I need to make different adjustments for the wideband input on the E85 tune than I need to make for the 91 octane tune. And
if so, how do I know what the inputs should be? I would LOVE it if I could just leave it on the Lambda readings and that would be adequate in both the gauge readings as well as the outputs to the ECU for both fuels, but then again, I have A LOT of money wrapped up in this engine build and I can't afford to blow it up because I ASSUMED something. So I'm asking if anyone else has set up a car on the same wideband with the same engine manager.

SO, anyone?

[Spunkster]

http://www.hondata.com/techplxwiring.html

Installation will be similar to the PLX, just substitute the correct wire colors from your wideband.

You may find this helpful: http://ethanolpro.tripod.com/id213.html

[I Hate Import Cars]

http://www.hondata.com/techplxwiring.html

Installation will be similar to the PLX, just substitute the correct wire colors from your wideband.

You may find this helpful: http://ethanolpro.tripod.com/id213.html

Thank you, that is very helpful. Now do you (or anyone) know if I can just set my gauge to read in Lambda and leave it alone regardless of whether I'm running E85 or unleaded and still have accurate readings? Or do I need to go into the AFR setup and change the stoich point to be what that fuel calls for? And if so, do you know if the datalogging output would follow suit?

[Hondata]

If you set the units to lambda, then by definition the units will be correct. Otherwise the air/fuel will use 14.7:1 for the conversion.

[I Hate Import Cars]

If you set the units to lambda, then by definition the units will be correct. Otherwise the air/fuel will use 14.7:1 for the conversion.

Can you explain that a bit further for me please? Are you saying to set the units to Lambda in SManager? Or on the gauge? I figured out this much so far; when I set the max rich and lean points on the bar graph display (BGD) on the gauge, that determines what the 0-4v output is going to be. In other words, if the max lean point on the display is 1.2 lambda, and the max rich point is .67 lambda, the max rich point would give an output of 0v, the max lean point would give an output of 4v, and everything in between would be linear.

But when I go to the closed loop tab in SManager, the voltage/lambda conversion table has values in it that are in AFR, not Lambda. So can I change those values to 0v=.67 and 4v=1.2 and have the program realize that those values aren't .67:1 AFR? Sorry if these questions are unclear, I can give you any other info you need, just let me know, and thanks for the help!

[portenio78]

The gauge will read the same for reg gas and e85. So in other words, 14.7 A/F would be displayed the same for both fuel types. The sensor records lamda, and the controller displays air/fuel. It ends up being the same on the gauge.

[I Hate Import Cars]

The gauge will read the same for reg gas and e85. So in other words, 14.7 A/F would be displayed the same for both fuel types. The sensor records lamda, and the controller displays air/fuel. It ends up being the same on the gauge.

No, I have the option to have the gauge display read in either AFR or Lambda. Are you saying 14.7 would be displayed in SManager for either fuel? That would be very confusing if so, as that's not the target AFR for E85. The sensor records in Lambda, the controller out put is based on Lambda, but then the SManager is giving numbers in AFR, not Lambda. Since target AFR is different for each fuel, yet obviously target Lambda is the same for both, I want SManager to look for input from the gauge in Lambda, not AFR. Does that make sense?

[portenio78]

Tune e85 just like reg gas. Your not are not going to want to idle in the 9's. Read this and you'll understand.
http://honda-tech.com/showthread.php?t= ... =e85+lamda

[lwatkinson]

Correct me if Im wrong.
The controller outputs the same voltage to the ecu with e85 or regular gas selected on the controller.
The difference is what number the controller tells the gauge to display.

[Luke]

as far as i have learnd it in university it says, that lamdba 1 is stoich.

that means, that for 1kg of fuel is a certain amount of air needed, to get burned fully.

for petrol this amount of air is 14.7kg. for E85 it is 9.8kg.

so: stoich is the same, indeed. but the bases are different.

when you put lambda 1 for petrol and tune then for this lambda with E85, then you'll run a lot to lean.

so you should aim AFR, if you don't want to reset your wideband everytime you switch from petrol to E85.

best regards Lukas

[lwatkinson]

You set your voltage/lambada conversion in hondata. The offset settings for e85 is 0v=6.6afr 5v=13.2afr. For gas 0v=10afr 5v=20afr. 2.35v is stoich for both gas and afr.

[Luke]

You set your voltage/lambada conversion in hondata. The offset settings for e85 is 0v=6.6afr 5v=13.2afr. For gas 0v=10afr 5v=20afr. 2.35v is stoich for both gas and afr.

in that case your wideband will read different values on the gauge and in the smanager.

that should work ok, but can be a problem for unexperienced tuners.

best regards Lukas

[lwatkinson]

If your gauge is set to read gas afr and it reads 14.7 but your smanager is set up to read e85 afr then it will read 9.7

Both are lambada 1 or 2.35v

lambada-00.68--00.80--00.90--01.00--01.10--01.20--01.30--01.36

gas afr--10.00--11.76--13.23--14.70--16.17--17.64--19.11--19.99

e85 afr--06.60--07.76--08.73--09.70--10.76--11.64--12.61--13.19