Originally Posted by boost it
so i had a ? i have a 3.5 charger wit 3in custom exhaust and AEM cold air intake and the Diablo tuner running on the 93 octane and seems like i am burning more gas then what i have been burnin before wit all the mods i have on? but might be cuz i push drive fast sometimes. and will it be bad to change the tune to 87 octane and run 87 for the winter to save gas. Don't want to change it back and forth between summer and winter and effect the car can any one help?
I have to agree with the others. The 3" exhaust has caused you to lose some scavenge in your cylinders for sure. However, running a Diablo Predator on a 93 tune will put more fuel into your engine as it is a performance tune. It uses a portion of the fuel as coolant.
If you do not have any internal mods in your engine, the 93 is just slowing down the burn to the point you are putting too much fuel into the engine and not really getting efficiency. When you tune the engine for the best efficiency, you will get the best Horsepower too!
87 and the stock tune will give you better fuel economy and the engine will handle that just fine. However, if you want more performance and MPG consider using the ACES IV in your fuel. It produces more power per fuel charge with lower octane fuel that will run in your 10.1 to1 motor. Get lubricity for your 4 valve stems per cylinder and upper cylinder lubricity to cushion the valve seats, faces, valve guides and valve stems.
Great difference in power and fuel economy.
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