Tuning E85 on Megatune

[EcotecFiero]

Hey guys,

I have a engine that will be starting on E85 for the first time. I have setup my LC-1 to read at 9.87 for the AFR. But how will megatune see the difference?

Will the AFR gauge be switched so the Middle "correct" portion is 9.87 or will it still be based on the 14.68?

[woh]

There is a lot of reading to do.

You can start here;
http://www.msextra.com/manuals/MS_Extra ... .htm#howto

From your description, you may have a loose/disconnected MAP/vaccuum hose to MS1.
Does your MAP gauge respond to the throttle?

[Minami Kotaro]

Will the AFR gauge be switched so the Middle "correct" portion is 9.87 or will it still be based on the 14.68?

The gauge in MegaTune will still output numbers for gasoline, i.e. 14.7 for stoich. You could try tuning by lambda instead. Lambda is constant for all fuels.

[LT401Vette]

I made the same short sighted blunder in MLV, did things in AFR. Then if you really look under the covers the first thing I do is convert it to Lambda as it makes more mathematical sense. But because I started with 14.7, all fuels need to target 14.7:1 for 1.0 Lambda. I'm hoping to fix this for MLV 3.0

We should look at turning future firmwares to work in Lamda, then let the tuning software display in AFR if the user so chooses. That would be much less confusing for non-gasoline users...

[EcotecFiero]

How do I reset my AFR table to read in Lamba instead of actual AFR ratios? Will the gauge still read chemically correct at 14.7?

[LT401Vette]

MLV needs the tables to read in AFR for VE analyze with the way it works right now. And the 14.7:1 is a lambda of 1 regardless of fuel you are using.

I really want to change this once I get caught up on TunerStudio.

[EcotecFiero]

Ok so I should just modify my AFR tables then correct? What is E85 max power for WOT in Gas AFR terms? What AFR should I be shooting for?

I know that lamba for E85 max power is .71 and gas is .85, but how do I convert the numbers I am shooting for in E85 to the AFRs for gas?



I have it running now, but the gauge is at like 7.63-10 so that means I am WAY rich for e85? Amazing how well E85 works in a variety of fuel ranges

[Minami Kotaro]

disregard

[LT401Vette]

With Lambda fuel independent, you will have the gasoline equivalent AFR.

Lambda 1.0 = 14.7:1 (Gasoline) = 9.765:1 E85

With MLV doing all VE Analysis in Gasoline AFR, you need to convert your E85 Lambda or E85 AFR to Gasoline AFR
To convert to your desired lambda, use this formula:

[MLV target AFR] = 14.7 * [desiredLambda]

or for AFR:
[MLV target AFR] = 14.7 * [E85 AFR] / 9.765

[EcotecFiero]

What do you mean MLV?


I can seem to get my AFRs out of the 7-11.5 range. Im not sure if it a WB error or what. I did set it to E85 on the Innovate program.

[LT401Vette]

Sorry, MLV is MegaLogViewer. In MegaTune or TnuerStudio, you should be able to stick with Lambda.

[EcotecFiero]

Ok so how do I change to lamba in MT?

Ive been running it awhile now but, it takes along time to start on the first start up, it seems to be running lean, but the AFR is 7-10, and doesnt move from there.

Any ideas?

[LT401Vette]

You will need to set it in the Configurator. Or if you use TunerStudio you can set it in Project Properties on the Settings tab.

[landybehr]

... on the first start up ..... the AFR is 7-10, and doesnt move from there

I think MT does "freeze" the AFR gauge for 1/4 minute or even 1/2minute (cannot recall exakt time). Furthermore the LC-1 wideband sensor I use would not provide any data for a short time after startup.

But after 1/2 a minute (if not a little earlier) the AFR gauge should be alive - before my AFR gauge shows a fixed "virtual" 7.10 AFR

[EcotecFiero]

The AFR is showing a varying AFR between 7-10:1. The lamba is right around .98 as well, and hardly moves despite what I do to the VE tables or reqfuel. Is this going to be a LC-1 problem???

I drove it finally and it feels "ok" at 2100rpms but struggles anything above 3 and doesnt want to rev.

[EcotecFiero]

Well Im pretty certain I have an LC-1 issue...

Ive replaced the Bosch sensor and done the free air/heater calibration outside the exhaust and MS still shows it reading 7.64 or .98 lamba.

Suggestions? When driving it will go maybe up to 10.5 or so, with no correlation to the actual amount of fuel. Ideas?

[landybehr]

Hi,

I have had wrong LC-1 readings on some occasions due to:

1) wrong wiring. The LC-1 offers two wires (IIRC one yellow, one brown) and one of them sends wideband signal to MS and the other simulates a narrowband. The quick-guide from Innovate just said "take either/or" of them Of course I took the wrong wire and told MT and MS to listen to a WB which in fact behaved like a NB.

2) forgotten to calibrate the oxygen sensor in MS via the function of Megatune - on the rightmos pulldown menue, where you also calibrate the coolant and IAT sensors.

3) after a new installation forgotten to change to "Wideband" in the .ini files. This is done withe the Megatune-configurator. Which you start before you deal with Megatune (where you also change between °F/°C, code version etc.). I´ve had the calibration ( 2) ) and one other pulldownmenue second-left (basic setting) of Megatune with the EGO settings right (set to wideband) that time and wondered why the bar graph on the bottom of MT behaved like expected but the AFR gauge showed nonsense ... and MLV did very crazy VE-tuning suggestions (with a closer look to the datalog soon identified as non-logic AFR signal).

Hope that helps.