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Tuner Tech: Changing Fuels
We receive a lot of requests for both 87 octane and 93 Octane tunes, for the same vehicle. This can cause issues, so you have to be very careful. Draining the tank isn't always an option for the customer, so we've come up with some simple steps to ensure you have the correct fuel, for the correct tune.
Let's start with going to 93 Octane from an 87 Octane tune. You must run the fuel down until you're below 1/8th tank on the fuel gauge. The closer to empty the better. Next, you must fill up with 93 octane. Before any full throttle or aggressive driving, put at least 15 miles on the vehicle. In boosted applications, be sure not to make any boost during those miles. This will ensure that the 87 octane is not in the fuel rails and lines. Lastly, find a secure place to change your tune. I say this because lets face it, if its man made and it can fail. You don’t want to be stuck somewhere. Once you change tunes you are all set.
Now when switching back to 87 octane, you can just load the tune and go. You can always go to an 87 octane tune, with 93 octane in the tank, just not the other way around. Keep in mind it that it's the customers responsibility to ensure the correct fuel is in the tank for the tune loaded. If you are unsure which tune is in the vehicle, you can always reload the one for the fuel in the tank.