Chris,
If one was to set this scalar to "Enabled", say on an '08 Z06 (;)), would this allow the system to function "virtually", and/or are there other areas that need to be addressed, as well?
Thanks!
James
Printable View
Chris,
If one was to set this scalar to "Enabled", say on an '08 Z06 (;)), would this allow the system to function "virtually", and/or are there other areas that need to be addressed, as well?
Thanks!
James
there is a lot that needs calibrating that probably isn't by default. I put this one in there so people could turn it off, not on ;) There's probably a couple hundred params for this that control the virtual fuel composition sensor behavior and it's linkage to the O2's and fuel trims etc.
How about making these parameters visible? ;) (hehehe, but seriously...FL is going E10 by the end of next year, and I'd like to have that running on my car.)
Thanks for the info, Chris!
Just make a simple change to your stoich value 0.00% cell, and BAM, everything will fall in line.Quote:
Originally Posted by LazMan
James,
Chatting with Greg the other day. Looks like GM set things up in the Vette to be unfriendly to E85. Rubber lining in hoses is the number one issue. Number 2 is the fuel sending unit is not E85 friendly. Will corrode over time.
Same thing on the trucks. E85 trucks have different fuel lines and fuel sending unit as well as a different fuel pump design. So yes you could "flip the switch" but there are problems awaiting.
I've done that lots RWTD. I ran E63 (custom mix) on my Monte SS a month or so back. Very nice (MPG sucked tho) ... but with more and more E10 around, it'd be nice for the computer to calculate it itself.
EC, I figure in another year or two they'll have to start putting E85-safe hosing et all in all cars ... as more E10 is around. In Florida, it will ALL be E10 by the end of next year...
:(
... So, my 33mpg tune will go back to under 30. Sheesh.
Quote:
Originally Posted by LazMan
E10: It will allow gas stations to water the gas down more and not have people notice...
Quote:
Originally Posted by BBA
bingo, less mileage same price. whats not to love
its interesting that people are concerned about e85 eating lines. i am almost positive i read that the fuel line part numbers for both e85 and non e85 trucks are the same. i will verify tomarrow
I think you're right about the trucks texsrt4. Alcohol eats natural rubber lines. Synthetic rubber lines are (alleged to be) ok.
If you can check P/Ns, check the fuel pumps as well.
Ethanol will also react with non-anodized aluminum, which may vehicles use for fuel lines or rails. Further, the contacts on most fuel level sensors are subject to erosion via electrolysis with alcohol fuels. Flex fuel vehicles typically have stainless lines and in-tank sensor contacts to avoid this.
dont switch that to enabled, i tired it in my colorado and the computer freaked out.
I tried it on my 08 STS Northstar and set the switch to enable and filled up with E85. The AFR adjusted correctly and the engine run fine but then I dedected rough shifting. Looking at the scanner I saw that the delivered torque numbers were quite high. So I think the calculation of the delivered torque must be misscalculated.
So I set it back to disable, changed the main AFR for the E85 and the car run fine.
Is there a (hidden) table which has to be changed so that the PCM calculates the torque correctly?
From what I understand, I am fairly certain that there are many hidden tables and/or values.
Didn't seem to make a difference in my GTO at all. I was so hoping to be able to run either 93 or E85 interchangably. :(
talk to Frost on here to see if one of his dual flash pcm's is compatible with your setup maybe ? it does exactly what you are saying 2 different tunes at the flip of a switch , heres a link :
http://www.tunedbyfrost.com/products.htm
after some more research and thinking. I would much rather simulate the alcohol sensor in a 0411 flex fuel truck and basically turn a "percentage of ethanol" knob to tell the pcm how much ethanol is in the fuel mixture. I have a test kit and do not mind taking the time to fillup and take a fuel sample and adjust and go. does anyone know if thats even possible. and what kind of signal does the ethanol sensor send. does anyone know if its a 0-5v reference?
kicking a dead horse, Any chance of seeing these parameters? Any reason one couldn't enable this on a G8?
Sure is a reason not to. Have to be missing some tables, as my command AFR didn't change at all when I put it back to stock and turned on the Flex Fuel. Oh well.
Not the case on the G8 GT tune. I threw the switch on, started the car with the default stoich with e85 in the tank and the trims went crazy but the commanded AFR didn't move. So I thought it might have something to do with filling up, or the car knowing there's more fuel in it to start the algorithm or process, but this wasn't the case. Re-Filled it up and threw the tune with flex fuel enabled on it, no change either. So I'm guessing I'm missing some cables/calibrations? I'd guess a 09 Gen IV E38 pcm has the capability of doing this?
pretty sure it has been posted that this is just to disable/turn off flex fuel,, i really dont think just one switch parameter will enable the system
There is no system. Not everything available to change in HPT is installed on every car. For instance, I can adjust the TCC and shift speeds of my 2001 Z06 all day long but the car will never have an automatic transmission.
BTW, do the Flex Fuel trucks come with a flex fuel sensor and actually use the ethanol % stoich table still? I heard/read GM isn't putting the sensor in the trucks anymore.
True/False?
How does the virtual sensor work?
I'll never run E85 in the truck so what happens if I disable Flex option and set all the stoich table values to 14.22?
Interesting info:
Flex Fuel Option
{B0178} Flex Fuel Option Yes
{B0184} Flex Fuel Sensor Type Actual Sensor
{B0185} Flex Fuel Default Percentage 50 %
{B0186} Flex Fuel Sensor Diagnostic Enabled
{B0187} Flex Fuel Diagnostic Run Time 3.0 Seconds
All these tables, and Pin 40 on the E38 ECU seems to be where the flex fuel sensor goes. If we had access to these tables, could we add the sensor?
Okay, I have a dumb question. Does changing the value of stoich in the 0% column do anything on a non-flex fuel vehicle (an '07 Z06 in this case)? I only ask because we get the typical "up to 10%" gas in most all the pumps around here and obviously that's not going to be 14.67 or even consistent from one fill to the next.
Since this amount varies and the car has no way to know it must be relying on fuel trims to adjust. For purposes of tuning and optimum performance it's somewhat important though. This is what I'm thinking if I've got this right in my head: If the car was tuned for "pure" gasoline and you put E10 in the tank, it would presumably be adding fuel. If positive LTFT values are added at WOT this would then correct bringing the car back into the best power range. Obviously this wouldn't be instantaneous, but would take some time for the LTFT values to adjust. Do I have that straight?
id like to try it with the sensor and have a true flex-fuel tune.
Man you guys are reading my mind!!
In theory it should work fine for setting up the pcm for use with E85, other than that its a stretch though. Bill your above statement really make me think but I will try small changes first
The E-85 set up TABLES will be very cool
2008 TBSS AWD K@N ,Cat back
Meth
Turbo soon
Heads
My next buy a Wide Band O2 w/data logging
Then I will make small tuning changes in the fuel tables
Thanks,
Mr. 2008 SS