Posted October 5, 20168 yr My car has a nistune board fitted and has the option for flex fuel enabled. Can someone clever please tell me exactly what this is for and what it will do for me if I buy the ethanol sensor and loom. Thanks Sayers
October 5, 20168 yr It takes the ethanol content of the fuel, and adjusts the map's air fuel ratio (& timing I think?) to make the most power based on that fuel (still has to be tuned for it though). So if you fill up with a lower octane fuel such as regular unleaded, it will adjust the air fuel ratio and retard the timing so that 1. it doesn't detonate. 2. It has the correct air fuel ratio for most power based on that fuel. IMO if you fill up with generally the same petrol every time, and that is what your car is tuned on (say momentum 99), then it shouldn't change anything because you are always using the same octane fuel. But if you sometimes want to put an octane booster in there or fill up with crappy petrol if there are no petrol stations around it will still rin fine. Somebody can probably explain in more detail but that is it in a nutshell. Edited October 5, 20168 yr by Alic
October 5, 20168 yr I think its a function that allows for switchable maps for different fuel usage to keep the AFR correct.
October 6, 20168 yr The Nistune FLEX fuel option is for E85 fuel. (bio-ethanol) One of the best fuels for turbo-charged cars (car needs to be tuned/prepared for it though) ...I don't know if E85 is (still) available in the UK. it used to be available at some stations in Holland, but they stopped selling it
October 6, 20168 yr No Lymon they taxed the hell out of it meaning that with its subsequently higher consumption combined it was not financially viable and was withdrawn from the market. You can buy it in drums but this works out even more expensive. So it's Dinosaur bone fuel only here to.
October 6, 20168 yr its still common across France. the other major problem with it is that it causes plastic fuel tanks and other plastic components to distort when left unused for a while. quite a few bike fuel tanks developed blisters over winter.
October 6, 20168 yr Is E85 otherwise known as race fuel ?Pretty sure its a biofuel. But anyway, it has a higher ethanol content than regular premium fuel, it produces a bigger bang however the optimum afr is different requiring more fuel per air than regular fuel, so injectors/fuel pump need to be upgraded to supply enough fuel. You also get quite bad mpg and as Craig said, some components need to be replaced to deal with it. it also has more knock resistance. If all you care about is power and have a fuel system to cope with it, you could buy it in barrels but it is expensive and you'd be sacrificing alot of mpg Edited October 6, 20168 yr by Alic
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