turbotuner20v

So now that I'm going down the flex fuel path, I was curious what people thought about displaying the ethanol content on the aeroforce gauges.

Copied from another forum:

"Point a 100Hz square wave* into that port and the "Flex Fuel Sensor Frequency" PID kindly reflects that it sees 100Hz on the sensor, and also says that the fuel composition is 50% ethanol on the "Ethanol Fuel Percentage" PID.

Vary the square wave up and down from 50Hz to 150Hz and the % E content runs from 0 up to 85%. The actual range the E38 reads is around 20Hz to 190Hz or something like that, but the composition range runs 0 @ 50Hz to 100% @ 150Hz.

Tested this on several different E38 OS's from 06 through to 08 and the pin number and results are consistent."


It sounds like aeroforce just needs to add those PIDs to the gauge, or has anyone made this work yet?

Unreal

I know dashlogic displays it just fine.

5 Liter Eater

I don't have any clue what they're talking about with regard to square waves but the Aeroforce, while reading PIDs directly from the PCM, has its own set of built in PIDs that it can display. Looking at the manual for the Interceptor, "Flex Fuel Sensor Frequency" does not appear to be one of them. In order to pipe the flex fuel sensor into one of the two analog inputs the output of it would need to be 0-5V and you'd need to figure out the slope and intercept to change it to percentage.

turbotuner20v

Nice, straight from the ecu, not external input? That would lead me to believe it wouldn't be too hard for aeroforce to add it.

turbotuner20v

Hopefully they can update the firmware on the gauge to show the "Ethanol Fuel Percentage" PID

Unreal

The flex fuel output is a square wave pulse, not a 0-5V. Need an adapter to read it or some circuitry to convert and read it. Dashlogic can display it through the ecu. Aeroforce would have to add it as a PID.

Corvettinator

This is good to know, as I am considering Flex conversion and have the Dashlogic. Dashlogic only has two analog inputs, so they are precious.

Skunkworks

A GM flex fuel sensor actually outputs 2 variables, fuel composition 0-100% ethanol and fuel temperature.

Base frequency is 50 hz for 0% and 150 hz for 100%. The frequency is also PWM (pulse with modulated) from 1-5 ms for temperature (this info I do not have handy). So it is not a 50/50 square wave.

blacktavert

My understanding is that aeroforce just needs to add it as a PID
I am wanting them to update this also as I am using the aeroforce gauge in my CTS-V and planning to convert to flexfuel soon

For my Z06 I am using the dashlogic to display the ethanol %

DSteck

It's just a matter of identifying the PID. Both the DashLogic and Aeroforce just poll the CAN bus for information. Aeroforce just seems to not have enough demand to warrant adding the PID.

Unfortunately the ECM doesn't pay attention to the high duration of the pulse, so it won't read fuel temperature. You'd need an external microprocessor to interpret that.

turbotuner20v

I just emailed Aeroforce and got a pretty quick reply

"we are currently working on a method to do just that. keep an eye on our website for an annaouncement soon"

Hopefully it'll work on the aeroforce soon.

5 Liter Eater

That's cool but I can't remember how the firmware upgrade works on the Interceptor. I think at least it needs to be sent to Aeroforce.

turbotuner20v

blah, yea, looks like $25 reflash fee plus shipping both ways

Oh well... probably the cheapest ethanol gauge I could buy at this point (~$50)

5 Liter Eater

QFT

Unreal

Or just swap to the dashlogic. Best thing I did.

turbotuner20v

I don't have HUD on my car and always display coolant temp on the DIC, plus I have the dual Aeroforce gauges already.

greerracing

Does anybody know if the ethanol percentage will show up on the dashlogic on a 2005 c6, because my torque app cannot find it for my car.

blacktavert

Received a message back from aeroforce today about this

"We're going to create a beta version with what we think is the correct parameter for alcohol % and start testing it. Then when it's confirmed to work people can have their gauge upgraded with a reflash it they'd like."

BigJay08

It shows on my aeroforce gauge (C7 Z06)