In Summary: Change fuel pump $200-$700 Change filters to E85 compatible $200-$400 Change fuel lines (Teflon/PTFE with Graphite/carbon is the best as it doesn't react at all to E85. Need AN fittings to use tho) $100-$500 (Pending rubber or Teflon hose) Change FPR $150-$400 Change Fuel rail and injectors $500-$2000 Change ECU to Haltech or similar $2000+ Buy Flex fuel Sensor for E85 $120-$170 Buy Expansion box (If running Haltech) $500 Tune for E85 (decent) $600-$1500 It cost me a small fortune just for the fuel set-up. As I spreadsheet everything, it tends to add up real quick... Of course all the prices quoted above are for new items. Dont skint out on filters either and be prepared to change them/clean them a lot when you first change over to E85. E85 tends to do a very good job of cleaning out the gunk and gummed up deposits from your tank and whatever else it touches. Its an expensive exercise but from what I've read and been told, well worth the investment. Build completion will tell...
Not needed . Haltech modified one of my inputs I wasn't using so I didn't have to run an expansion box . great customer support. .
I spoke to them about this actually after reading your build thread. Their response was: "Your Platinum Pro Z32 has 4 Auxiliary In/Out puts as standard. However, it does not have the DPI that is required for the Flex Fuel Sensor. You will require an I/O12 expander which has the DPI you need. You can then wire in your additional sensors and accessories to the IO box also. Its not possible to modify the ECU to have an internal DPI, the hardware just isn't there. I would say this other person had their ECU modified to turn the ATI to AVI inputs - this is nothing related to a digital flex fuel input" Meh, i just couldnt be bothered discussing any further so I bought the expander box...
flex fuel must take a while to tune? do they do just a set % of change in fuel map vs ehtonal content or?
Yes an average of $1200 Basically around 15% change in fuel maps Start with E85 and keep adding 98 fuel Haven't done mine yet. .
Thanks Blackbeast A flex fuel tune is tuned with various maps which allows you to run 98 to E85 with anything in between example E15,E25 etc. It automatically reads the ethanol content and adjusts the map to suit . It's not just 2 seperate map tunes . Fuel tank is fine ..it's recommended to keep your tank full if not using car for a period of time as it is less likely for the ethanol to absorb water. Pintle style have known to fail due to corrosion .. You can search that . Aluminium will be fine and stock rail is fine just use adaptors for new style injectors. Getting well Over 400 rwkw ..change fuel rail because you will need 1000cc and more volume in flow .. Top feed is the way to go . You will make more power everywhere .. spool and top end as you can run aggressive timing and boost way past the limits of 98 fuel as well as combustion runs cooler .. Oh thanks mate for the post! It answered nearly all of my questions in a good easy to understand format Good on you and thanks Jamie
Thanks for the time to write a list Thanks for taking the time to write the checklist Not a bad checklist to start with either - appreciated!
Ok, just to clear this up. THIS IS 100% INCORRECT, i would hate for someone to read that and to blow their engine up. Stoich for petrol is 14.7:1 AFR, its 9.76:1 for E85. YOU CANNOT RUN PETROL AFR'S WITH E85! A wideband reads in Lambda and converts lambda to afr, thats why a wideband will read petrol afr's if you run E85. As for all this changing lines BS, its just that, BS. There are cars i know that have been on E85 for 5 years and run stock lines. want to know how to run E85 plain and simple? Good flowing E85 pump, Pintle less injectors(1000cc+ preferably), Aftermarket ECU and a good dyno tune, you cannot road tune E85 properly. Best of all is to tune it on E70, running a tad richer than optimal, this will allow you to run E85 without problem.
There's a really good thread on SAU about setting up flex fuel http://www.skylinesaustralia.com/fo...-thanks-to-chequered-tuning/?hl=e85 flex fuel A Z can probably be set-up to run E85 with 740cc injectors and an ethanol tolerant fuel system once Nistuned and get about 250rwkw but if you want more power you'll end up getting 1000cc injectors as BB said and might as well get top feed if you're going big. If you want to be able to travel in your Z you'll need a flex fuel system or multiple map/ECU system and end up spending $20k, not including an engine built to handle high power.
Ummm.. it needs to be made quite clear that there is little, if any increase in performance by just adding the E85 at the correct mixtures for that fuel. The only horsepower available is from a more aggressive tune that ethanol blend fuels will support safely. Your ally components will NOT ferociously corrode away. The ally corrosion everybody squeals about is a drawback of using METHanol (wood alcohol) which is a totally different animal altogether. E85 is petrol blended with ETHanol. There are some issues with rubber and plastic compatibility as mentioned above which is easy to get around. E
Well... yes but that wasnt really his point. The fuel requirements to change from petrol to E85 are in the vicinity of (lets say) 30%. This is an across the board change so the addition of 30% higher flowing injectors and nothing more will run quite happily on the bone stock ECU. However fuel economy will suck. E85 will support much leaner mixtures than petrol will so additional tuning at low and moderate power levels can go quite a way to reducing a sudden 30% increase in fuel usage. E
Actually, it IS just 2 tunes!! One for petrol and one for Ethanol. All that happens is that the ECU "looks" at the ethanol content of the fuel via the flex fuel sensor and simply interpolates between the 2 basic tunes. its very simple really. Someone stated a 20K bill to convert to E85.....? THAT is preposterous!!! 6 injectors is all you need on top of any additional compatibility issues to drive on. E
Hey E Its not linea how the ECU compensates for the ethanol change. its not 2 tunes and the ECU works it out on it own which is why it is tuned in stages from e85 down to 98 in 15% map changes .
In its simplest terms it is just interpolation between 2 fuel tunes since E85 requires the fixed percentage more fuel to achieve its stoich. It may not necessarily be linear interpolation but i didnt say that. The ECU just interpolates between the tunes based on the % ethanol content and it doesnt need to be any more scientific than that really. E
This is correct, a proper flex fuel tune is NOT just "two tunes with a flex sensor" its several maps tuned in small changes to ethanol content. I love the "she'll be right" attitude
In the haltech there is only one map (for 98). And then there is a % offset correction table for fuel/ignition depending on ethanol content.
Lol, agreed this is a little high. Realistically it would be around 6k for a pretty mean set-up - ECU with add-ons plus top feed kit plus lines, filters, FPR etc etc: Ecu with add-ons: 3k'ish Top Feed Kit: $1500 FPR, Filters, Fuel Lines: $1k Fuel pump $500 Thats if you did all the work yourself. Pay a workshop, might be 20k lol
