Alex, I've been doing some reading on E85 (as I know you plan to use this) and you'll need an ECU than can take readings from a Siemens Flex-fuel sensor in the tank. This will allow for variations in the Ethanol content instantaneously and optimise the tune accordingly. Link G4 plug-in can do this out of the box.
The sensor outputs a digital signal, a frequency where between 50hz and 150hz = Ethanol percentage. The wave form is able to give both E% and Fuel temp (both of which the Link G4 can read) - You can buy the digital to analogue converter from Zeitronix, but it's an all-in-one unit that has the E% display. About $170USD, which isn't too bad. This will then output an ANALOGUE signal of 0-5V, which might bring some more ECU's into play.


This was shamelessly stolen from SAU and can the PFC do this?
 

No, PFC cannot do this.
 
There is a catch 22 with the flex fuel sensors and running an aftermarket ecu in a flew fuel setup. The ECU has to have the ability to store and interpolate the maps.
 
You need to do multiple fuel tunes at various ethanol percentages, and know the ethanol percentage for each tank of fuel that you tune on. On top of this, you will need to run a wideband lambda sensor pernamently wired in to trim in a closed loop setup.
 
I doubt you will find a tuner that will do this cheaply. even if you did a corse setup 98/e60/e85 tunes and interpolation, your looking at a bit of money, especially when you add in the cost of the wideband sensor (which will have a limited lifespan been exposed to moisture on cold starts), flexfuel sensor plus making it fit and get wired in, then the ecu and 3 full tunes, it's quite an expensive exercise.
 
There was one guy on the SAU forums that was doing this with chequered tuning in melbourne to his ex midori racing r34 v spec nur. This guy has a lot of money, and time to play with, and is a perfectionist. They had been refining it over a number of months and were still not done.
 
Just some food for thought....

Or you just buy E85 by the barrel - option if the car isn't a daily, would get rather expensive if it was.

MCT_MR2

There was one guy on the SAU forums that was doing this with chequered tuning in melbourne to his ex midori racing r34 v spec nur. This guy has a lot of money, and time to play with, and is a perfectionist. They had been refining it over a number of months and were still not done.

Just some food for thought....

That was the thread/him actually. Yeah seemed like money was no object there. He just made it sound simple but I guess there was A LOT of work 'behind the scenes'. Alex, how deep are your pockets? lol

yeah i am starting to think that this isnt going to be possible for what i wanted, however in saying that i would still like to upgrade from the e6x that i am currently using to something a little newer...

ok i have been doing a little more research into this, and it looks like the link g4 storm and xtreme are capable to get the input from these sensors http://www.zeitronix.com/Products/ECA/ECA.shtml from that the following information can now be used as an axis in a Fuel Adjustment table:
 

· E85 % Ethanol - this is a measure of the percentage of ethanol within the measured fuel.
· E85 Temperature - this is a measure of the fuel temperature.
So still looks like this could be an option?

Alex I mentioned this a few posts up ;)
the Zeitronix isn't a flex fuel sensor on its own but basically just a digital to analogue signal converter with an LED display. If you have a Link G4 you wont need this as the link will accept the digital input from the flex fuel sensor, for both E% and E(temp).
There would still be a fair bit of tuning required though if you do go down the E85 route and you'd need to get a wideband running all the time as well - what MCT_MR2 said. 
 
 
 
 

Just bought myself a Link G4 plug-in... comes with an inbuilt map sensor for converting the gen2, and is a straight plug in module, unless you run an IAT sensor which is highly recommended for a good reliable tune. Haven't received it yet but from what I hear they are a great quality ECU, apparently the guy that designed the algorithms for Haltech left that company and made the link. Has lots of features and an easy install, for less $ than a haltech so it was an easy decision for me. Also these are meant to be really easy to tune and have good auxiliary sensory input options available to use. I can let you know how it all turns out if you like, should be arriving on monday then just need to book it in for a tune... All that is required as extra work is running the wires to an aftermarket IAT sensor using the optional auxiliary harness, once I've done that just configure a few things in the settings and should be fine to take it off to the tuner:D

ashtwo, where abouts in aus did u get it from? and how much did it cost you if you dont mind?
 
josh - yeah i did realise that i wouldnt need the actual screen to tell me what % of fuel etc, but could be a nice to have/know. I am still possibly looking into doing this, however i am going to have to become real good mates with a tuner down in SA for this to happen so i dont have to sell internal organs to fund it..

ashtwo

Just bought myself a Link G4 plug-in... comes with an inbuilt map sensor for converting the gen2, and is a straight plug in module, unless you run an IAT sensor which is highly recommended for a good reliable tune. Haven't received it yet but from what I hear they are a great quality ECU, apparently the guy that designed the algorithms for Haltech left that company and made the link. Has lots of features and an easy install, for less $ than a haltech so it was an easy decision for me. Also these are meant to be really easy to tune and have good auxiliary sensory input options available to use. I can let you know how it all turns out if you like, should be arriving on monday then just need to book it in for a tune... All that is required as extra work is running the wires to an aftermarket IAT sensor using the optional auxiliary harness, once I've done that just configure a few things in the settings and should be fine to take it off to the tuner:D

Short of getting a MoTec at over twice the price, the Link G4 is one of the best ECU's on the market. 
Are you going to be running the Knockblock interface? 
 
Would like to hear how it goes ash, as I'm keen to find how the 3SGTE responds to the Link :)
 
Alex: Also consider the availability of E85 in your area, unless you're going to buy drums of it. :D