evans_art

what is the best AFR for ethanol or methanol? which oxygen sensor can be use?

twkdCD595

someone correct me if I am wrong, but I think stoich a/f should be the following... now I dont know if thats where exactly where you want to tune for as I am not a tuner or personally experienced with either first hand.

ethanol 9.0
methanol 6.4

bump for others to chime in.

96 GSR-T

what is the lambda to afr conversion?

twkdCD595

to convert afr to lambda I believe you would just divide the afr by 14.7... agian someone correct me if I am wrong.

96 GSR-T

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by twkdCD595 &raquo;</TD></TR><TR><TD CLASS="quote">to convert afr to lambda I believe you would just divide the afr by 14.7... agian someone correct me if I am wrong.</TD></TR></TABLE>


Back from the dead, but i am bumping this, I am currently trying to idle my car on E85 and since my UEGO dont read 9.0 I need to use lambda on my laptop.

turbodano

This is with methanol.

It realy depends on your set up but lambda .66 to .68 should be close. Most o2 sensors won't read that low. .68 is a little lean, I would tune using 2 things egt and lambda as you lean your car out watch the egt's to make sure you dont go over 1150 if you use a dry head or 1300 if you use a wet head. Turbo back pressure is one thing you need to watch because it directly affects your egt's and you will have to add fuel to lower your egt's to keep the engine alive. Hign back pressure = high egt's and having to run lower lambda to keep the engine alive and will make less power.

Good luck.
Here is a link that gives you a lambda a/f calculator.
http://rbracing-rsr.com/rsrairfuelmeterl.htm

nowtype

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by turbodano &raquo;</TD></TR><TR><TD CLASS="quote">It realy depends on your set up but lambda .66 to .68 should be close. Most o2 sensors won't read that low. .68 is a little lean, I would tune using 2 things egt and lambda as you lean your car out watch the egt's to make sure you dont go over 1150 if you use a dry head or 1300 if you use a wet head. Turbo back pressure is one thing you need to watch because it directly affects your egt's and you will have to add fuel to lower your egt's to keep the engine alive. Hign back pressure = high egt's and having to run lower lambda to keep the engine alive and will make less power.

Good luck.
Here is a link that gives you a lambda a/f calculator.
http://rbracing-rsr.com/rsrairfuelmeterl.htm</TD></TR></TABLE>

WHAT WHAT WHAT????????

To get a basic tune on E85, just tune for the same AFRs as you would with regular gasoline. Once you do that, THEN you can start making minor adjustments and testing if you choose.

https://honda-tech.com/zero...98584

turbodano

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nowtype &raquo;</TD></TR><TR><TD CLASS="quote">

WHAT WHAT WHAT????????
</TD></TR></TABLE>

Did you not see the methanol part.

Thanks for the e85 info we dont use that fuel.

nowtype

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by turbodano &raquo;</TD></TR><TR><TD CLASS="quote">

Did not see the methanol part.</TD></TR></TABLE>

The thread was brought back from the dead and you responded to 96 GSR-T who is talking about E85. You are correct though, I didn't connect your comments to methanol. My bad.

turbodano

No biggie. My bad also I forgot to quote who i was responding to.

Garage 808 Hatch

E85 is 9:1
and meth is between 5-6:1, im thinking 5.4

96 GSR-T

in one of those articles it says tune to 9.7 stioch and 6.9-8.4 for a NA car, so i am assuming an AFR of 6.0 would be safe on Ethanol, what Lambda reading would that be? as far as backpressure, I probably dont have too much of that to be of concern ie P-trim turbine wheel and an open 3" DP

96 GSR-T

taken from the E85 thread, confirm if this is accurate......

"Ok I understand now, the sensor reads in lambda only so when e85 is running in it stoich range the sensor sends a signal of 1 to the dispay which reads 14.7 because the gauge is calibrated for gas. So basically the gauge output is just a different reading of lambda, like if it was calibrated for some fuel that we dont even know about where stoich is 83:1, and I put e85 in there the gauge would read 83:1 at the 9.7:1 e85 stoich. The display is just an interface for the lambda signal form the sensor.
So in closing, I will be fine just putting in e85 and tuning off the PLXm300 display pretending that it is just 93 octane. I.E with the E85 in the tank and the m300 I am still looking for an 11.5-12.5:1 A/f ratio on the display under full boost, even though it is much richer in reality."


so basically my wideband sensor is always sniffing for stioch whether it be 6.0 for methanol or 9.7 for ethanol, and will display that as 14.7? sorry if this is simple, I have a hard time of reading and and understand topics that are totally new to me

bigbadboy

pretty much no matter what stoich your fuel is its going to show up on your gauge as 14.7 so say the stoich for a certain type of fuel is 5.7 then it would show up on the gauge as 14.7 all your gauge is doing is translating the mixture into something you know. so just tune the car the same as you would on 93....... fuel wise that is. so just tune for 11.5 A/F under boost etc etc

96 GSR-T

well that would explain why my car runs like **** on this basemap, its off the scale rich I am just going to make a new basemap, bump up the fuel and fire it..... thanks for the clarifications.