Best gas for Hellcat

[Unholy707]

Fwiw I played around with it a little one summer and my car ran identical times and mph at the drag strip with Shell 91 (90/10) versus 91 ethanol free which cost about .50 more per gallon. I live at a mile high so our octane ratings are lower.

What id be interesting in seeing is the fuel trims with both

 

[Speedy!]

Fuel trims will shift. I tested it but it was a long time ago and I have forgotten by how much.

 

[GNBRETT]

Add a methanol kit.....

 

[MMissile]

I run whatever premium is at a station easy to get to, and 93 octane. My car is stock, will remain stock...and will never see the track.
It runs fine. Same with the 300C.

 

[2ndAmend]

I filled the truck with Sunoco 87 before leaving for land speed trials. Halfway I stopped at a rest area and filled with Citgo 87. Hour from the destination I filled with Irving 87. I'd swear the truck ran better on Irving. On Rt 1, I even passed a truck pulling a trailer with a 26T excavator (I had the HC in tow). After that, all I could think of was this thread.....

 

[jroyk]

I filled the truck with Sunoco 87 before leaving for land speed trials. Halfway I stopped at a rest area and filled with Citgo 87. Hour from the destination I filled with Irving 87. I'd swear the truck ran better on Irving. On Rt 1, I even passed a truck pulling a trailer with a 26T excavator (I had the HC in tow). After that, all I could think of was this thread.....
View attachment 172511

AFAIK, the lowest octane that doesn’t pull timing to prevent knock is optimal.

 

[2ndAmend]

If you all remember back in the day when they introduced the Taurus SHO with the 4 valve Yamaha engine... It produced more hp on 87 than 93. As you all know, octane slows burning. I never heard of any engine before or after doing that, something I will never forget.

 

[MMissile]

If you all remember back in the day when they introduced the Taurus SHO with the 4 valve Yamaha engine... It produced more hp on 87 than 93. As you all know, octane slows burning. I never heard of any engine before or after doing that, something I will never forget.

Must of had low compression or crazy cam events.