sunoco 260GT fuel worth it?
 

Any appreciable advantange to running Sunoco unleaded 100 octane gas in the Coyote engine? Will more HP result or possible engine damage?
Thanks,
Rick

I doubt it will be beneficial without the trackey

even with the track key I'm not sure its much worth it over 91/93 especially with the costs.

When you get the trackey I'll let you try it and let me know if it was :D

lol, point taken, however I hadn't heard anything suggesting the track key was tuned to run higher octane fuel.

I know a bunch of Audi B6/B7 S4 guys who swear by 100-110 octane fuel in their 93 tunes, and while they may feel the 2-3x per gallon cost is better performing, I don't see the value. My point wasn't in the calibration, but overall is that kind of fuel worth any viable difference in a naturally aspirated V8 built for the usual suspects in unleaded fuels.

Even the 302R cars are run with 98 Sunoco, though I wonder how far Ford can go with the street car's calibration. I guess until the key is in hands, or hands that can analyze the calibration just won't know.

I'm sure in the future the trackey will be available to the GT crowd too. :)

Well, in fact it does. See my post #41
https://themustangsource.com/f813/so...495813/index3/

As a performance engine builder there may be a slight gain by using the 260 but I feel the gains would be limited. When building an engine a rule of thumb is if you have been running cast heads and go to aluminum the compression can be raised 1 point (ie 10:1 to 11:1) and use the same fuel. This is due to the heat dissapation the aluminum has versus cast iron. I am not sure what the rule of thumb is when you go to an aluminum block but I assume that there has to be a gain as well. If you run a fuel that does not have enough octane the knock sensors will retard the timing but if you run a fuel that has too much octane it should not hurt anything but your pocketbook. There may be a small gain by using 260 but I am not sure it would be worth the cost in most situations.
Bob

Very interesting thread...I was wondering the same thing the other day.

Interesting indeed

I believe Jon Lund had tuned regular coyotes on 100 and said that he saw no benefits going past 96/98

100 octane provides some nice peace of mind when running hard on the track, and it's pretty much necessary on a supercharged car. But at 6-7$/gallon, your wallet will be hurting after the weekend.

"Economical" suggestion for guys that track the cars and want some added octane protection: 4-5 gallons of 100 and the rest 91 or 93. One tank should last you a whole track day.

the only reason i would ever run anything over 93 is if I was driving the piss out of the car at the track all day, and wanted it for protection.