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Originally Posted by jippii ensio
Good explanation and all correct. One thing to note though is that even if DME is able to calculate the ethanol content, it does not use the information for maximizing the performance. If you just fill in e85 to a stock car vs to a flex fuel sensor car that uses the info for maxing the performance, the results will be very different. The stock DME keeps the performance rather constant, whereas e85 tune is far from constant 
That's why flex fuel sensors are used to some extent in the tuning world. |
Of course it wont stock, it wasn't designed to even run E85 stock. Just saying the ethanol content sensor isn't a necessary thing, there are other ways to deduct fuel type. Although it's nice to have for flexfuel. Also, remember most aftermarket standalone systems lag 5-7 years behind current tech, sometimes more. A sensor is really helpful for cars that have lots of open loop in the tune or are slow to address fueling (ours takes milliseconds to potentially max out trims, which are not mechanical limits on our platform simply limits on the values in the software/flash).
In time maybe the computer will be further unlocked. Would be nice.