NASA ST4 - U build thread - engine swapped

[gt5759]

Originally Posted by redlined600

If you're de-tuning for P:W anyway, why not just run 91oct?

That's something i have spent a good deal of time debating on but with my end goal of running this at full power I think making the changes needed to get to that point makes the most sense in the long run.
Now yes, I could just flush the system, re-tune it, pick up 2mpg and leave the tank alone, If I was just staying in ST4. Being that I am already thinking of going to ST3 next year due to car count regionally and surrounding regions I feel this is mostly a waste of effort to do so. Couple other reasons is this motor is 13:1 compression and the cooling effects of the fuel like Midtenn mentioned.