Some questions about meth

[HolyCrapItsFast]

Basically with meth, you are relying on a second fuel source. If the pump fails run out of meth..., you run the risk of lean conditions and melting down the engine. Even if you build a safe guard in the tune, .5 seconds of lean is too long. I had meth for a while and it was fine until E85 came along. I went to a haltech ecu. It reads the ethanol content and bases the AFRs off of the reading. So basically if I do get a bad batch of fuel with lower than 70% ethanol, timing and boost is reduced. Also, winter blend ethanol is different. You should not run tons of boost with this. It is prone to detonation and is close to the 70% mark.

With the haltech, I can run pump gas in too with the flex fuel sensor. So if e85 isnt available, Im not stranded.

http://www.haltech.com/

http://www.haltech.com/flex-fuel-sensor-explained/

Standalones like Haltech and AEM are nice but in most states you have OBDII inspections which makes this only viable if you are using the car on the track. The only Haltech ECU that I know of with actual OBDII compatibility is for the Genesis and even then it gives only basic codes. Otherwise you would have to run dual ECU's and swap out when inspection is due. Not very practical when you consider you need a tune for the stock ECU as well if you have either e85 in the tank and/or have other specific mods.

That said I have been using the AEM V2 for some time now and believe it to have a very viable and street worthy flexfuel implementation.Their map blending strategy is pure magic and it's very easy to tune :tup:. In my next STi I plan on running the AEM all the time and when my inspections are due I will simply swap out with the stock ECU for a day.