Quote:
Originally Posted by Robin Lawrence
I use the VP Unleaded 100 in my Camaro. It has a GM Performance Parts Crate engine that makes 14 pounds of boost.
Depending on your tune too much octane can hurt power. It shouldn't hurt the car but because it has a slower burn rate there might not be any advantage.
Mixing gives different results with the different fuels. It's not like you can mis 92 and 101 50/50 and end up with 96.5 octane. It usually ends up being about 93 to 94.
Really from what I have seen with these cars is that the stock tune works well with 92 octane.
Good luck!
Robin
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Robin is right on. Anything higher than what the compression ratio, timing, and of course if forced induction is a waste of$. It won't hurt the car, but your power will be down as the higher the octane, the slower the combustion.
High octane fuels are used where we need to control the explosion to prevent detonation and melted pistons due to high compression ratios. 93 is good to 11:1 in most cars equipped with knock sensors & PCM/ECM to controll A/F & timing functions.
With a forced induction application, higher octane can be beneficial when running high boost. On our race motors we target 13.5 to 14:1 and need 116 or better for 900-1000 hp N/A.