Pump gas vs. race gas question

John H186 · 07-30-2009, 08:39 PM

Hello.

I have a sbf Mustang bracket car with a 312 ci normally aspirated engine with a 750 hp carb and 9.5 to 1 flat-top pistons. It runs high 11's at 112 mph in the summer heat and mid to high 60's in good air. I have been running Sunoco 93 octane pump gas for quite some time but have noticed that the fuel lately seems to be a little bit inconsistent in the way it appears and smells.

Sometimes it is very cloudy and does not have much of a strong gas smell to it while other times it is very clear and has that strong gas smell that gas should have. I know that Sunoco mixes a small amount of ethanol in it and maybe the way they mix it is what is causing the cloudy appearance but I don't know for sure.

My main question is do you think that my combo will run better and maybe a little quicker with the Sunoco 100 octane unleaded race fuel? A few guys on other sites feel that it won't do a thing but I believe otherwise. I do agree that 110 or 114 leaded race gas is way overkill for this combo but I really think the car will like the 100 Sunoco race unleaded. Also, what type of pump gas would you guys recommend other than Sunoco if I decide to stay with pump gas?

Thanks for the help,

John Hedenburg

07-30-2009, 08:39 PM	#1
John H186 Member Join Date: Dec 2004 Location: New Jersey Posts: 154 Likes: 1 Liked 1 Time in 1 Post	Pump gas vs. race gas question Hello. I have a sbf Mustang bracket car with a 312 ci normally aspirated engine with a 750 hp carb and 9.5 to 1 flat-top pistons. It runs high 11's at 112 mph in the summer heat and mid to high 60's in good air. I have been running Sunoco 93 octane pump gas for quite some time but have noticed that the fuel lately seems to be a little bit inconsistent in the way it appears and smells. Sometimes it is very cloudy and does not have much of a strong gas smell to it while other times it is very clear and has that strong gas smell that gas should have. I know that Sunoco mixes a small amount of ethanol in it and maybe the way they mix it is what is causing the cloudy appearance but I don't know for sure. My main question is do you think that my combo will run better and maybe a little quicker with the Sunoco 100 octane unleaded race fuel? A few guys on other sites feel that it won't do a thing but I believe otherwise. I do agree that 110 or 114 leaded race gas is way overkill for this combo but I really think the car will like the 100 Sunoco race unleaded. Also, what type of pump gas would you guys recommend other than Sunoco if I decide to stay with pump gas? Thanks for the help, John Hedenburg