Originally Posted by bmw335idizzle
So if I'm running 50/50 ethanol:91, I don't really need the Cobb flash? Only if I'm running more than 50% ethanol? Also, you're saying every time I refuel, I should reset back to map 5 so it will relearn my ethanol:gas mixture? U do that by just going back to map mode and choose map 5 right.
You need to log your fuel trims to see where they are at, I would do that before considering going with the cobb flash, if you plan on running higher than 50% mixtures, then you will need the cobb flash for that extra fuel