5 star tune for FORD V10

6door74 wrote:

blownstang01 wrote:
Major improvement in transmission performance. Small power increase, but it's there. I also seen no real MPG gain. Pulls hills better. Definitely worth it. The guy knows his stuff. I have both an 87 octane and 91 octane tune, modest power difference in the high octane tune, so I run that most of the time. To answer 6door , yes you plug the device into the OBDII port, but you have to upload the tune and it over-writes the stock calibration of the computer. So once you install the tune it's always running on that calibration tune until you program it back to stock.

I think i got it. With the 89 vs 91 tune, you just plug in the device before/after you fill up the tank with a different octane?

Yes, kinda. It takes about 4-5 minutes to change the tune. So, I don't normally do that on the road. The exception would be if I were on a trip and couldn't get 91 octane, then I would take the time to change it. I used to write tunes myself for the racecar using the same software 5 Star uses, and the only real change between a lower octane and higher octane tune is the timing map ie: more aggressive timing especially down low when using higher octane. However, the Ford V-10 uses knock sensors, so if any engine ping due to a low grade fuel or lower octane fuel is noticed the computer will automatically ****** the timing. So, even if you were to encounter some "bad" fuel on the road when using one of these tunes the factory hardware and software will compensate, within set parameters. Basically, once you load a tune you wouldn't touch it again for the most part.