c-12 to sunnoco blue
 

will a person need to go richer or lean out with this swap?

Re: c-12 to sunnoco blue
 

We've gone back and forth between those fuels in the Mirada, and without changing jets, the car ran identical. Makes sense to me to pay less! I've been running the Sunoco Blue for a few years now. Never a problem.

Re: c-12 to sunnoco blue
 

We have also backed to backed these fuels in my 327 carb. Olds and the boys 350 injected LT1 cars and found the only difference was the cost. Also Sunoco tests more consistent and has alot longer shelf life.

Re: c-12 to sunnoco blue
 

What grade of Sunoco to use in place of VP C-11?

Re: c-12 to sunnoco blue
 

This fuel stuff is crazy. I've had the opposite happen to me. I have had problems getting sunoco-purple to check. My father has also had the same issues with Sunoco-Purple. We run VP C11 in both cars and they check fine now. I don't know if this has to do with where I get the Sunoco? I didn't pass fuel check at the National Event in Reading. I could not purchase any Sunoco there so my only option was to switch the car over to VP. I'm happy with the VP, but it definetly is alot more pricey than the Sunoco.

Re: c-12 to sunnoco blue
 

That's very likely the culprit. I've never had problems with fuel check.

We've also done the swap from C-11 to Sunoco Blue... same deal, car didn't care.

For best results, though, when making *any* change, you should do some A-B-A testing to find out what *your* particular car likes.

Re: c-12 to sunnoco blue
 

Michael,

It prob does have to do with where I get it. We have run both fuels on the dyno and in the car. The dyno showed VP to make a slight horsepower increase, but back to back runs on the track showed very little difference at all. Not sure what I should do over the offseason? The main reason we have run VP is that we haven't had a problem in fuel check. I'm confused to say the least! lol!

Re: c-12 to sunnoco blue
 

Get your Sunoco by the drum and then you won't have to wonder where it came from or what a place cleans its tanks with. I get mine from Bearden Oil.

Re: c-12 to sunnoco blue
 

Had the same problems with Sunoco........went to c-12 and had no issues and the car ran the same.