which is faster- VP C-11 or C12

[rustbucket79]

Might be worth hauling the sealed pails to the fuel check station and have it tested before you put it in the car. Make sure you have fresh fuel up to the fuel check access point prior to making a pass, would be a shame to have some old fuel screw you're first qualifier.

[Pedigo Perf]

Originally Posted by rustbucket79

Might be worth hauling the sealed pails to the fuel check station and have it tested before you put it in the car. Make sure you have fresh fuel up to the fuel check access point prior to making a pass, would be a shame to have some old fuel screw you're first qualifier.

After you refill fuel system in the car, take it to fuel check and make sure it passes before you make a run. It may take some flushing out to get rid of old C12 to the point you will pass fuel check with the new fuel in the car. Speaking from experience.

Also, the specific gravity is significantly different from C11 to C12 and requires jet change just to get an apples to apples comparison. Of course there are other considerations such as fuel curve change and timing requirement may even change a little. Replacing one fuel for another without re-tuning wont give you a fair assesment.

Lower compression (less than 11-1) engines typically make better power on C11, my combo is closer to 12-1 and it make about the same power either way so I run C12 as it is easier to get and cheaper too. I have considered trying C11 at Denver but we haven't been able to test there. I have a hunch it may be faster at altitude as cylinder pressure drops up there.

Tracy Pedigo

[Ed Wright]

I may be doing something wrong. After some tuning my LT1 likes C11. Never one issue with fuel check. I don't drain or seal anything. Your results may vary. LOL

[KRatcliff]

Ed,

You are not doing anything wrong. I think C11 is easier to tune than C12 in our stuff. They both seem to be about as fast, but I prefer C11.

Pedigo,

Quit posting and get back to putting your engine together! Either you show up and race or you get to be my pit bitc...

[Pedigo Perf]

[QUOTE=KRatcliff;325281]Ed,

You are not doing anything wrong.

How can you be racing and not doing ANYTHING wrong.... KYLE?

[KRatcliff]

True!

[Alan Roehrich]

Originally Posted by Pedigo Perf

How can you be racing and not doing ANYTHING wrong.... KYLE?

Amen.

[Aubrey N Bruneau]

Does this mean that the more a person does wrong, the better racer thay are ???
wow !

I'm the best
I'm the best
the best, I tell you


Just checked, Mike. There's a dealer in Calgary.
The fuel seems to be VERY VERY 2 stroke oriented though ?

Altidude must make quite a difference. Didn't even think of it before.
I tuned carefully, with some pretty high tech equipment on a dyno, here at 3000+ ft, whispy air, using C11.
Went to Mission, at near sea level ( 700 ft cool air I believe ). When I got there, I bumped all 8 jets up 2 steps, and bought C12 fuel that ended up getting mixed with about half a gallon of C11 that was in the tank. Car went almost 5 MPH faster than it ever went before.
Whatever I did... I want to try and repeat it.
I know that may be over simplifying things, but I don't have a data logger, ect, to verify my tune at the track, and I can't really afford to make a half dozen tuning-passes ( car is somewhat hard on parts ).

[Mike Voth]

Originally Posted by Ed Wright

I may be doing something wrong. After some tuning my LT1 likes C11. Never one issue with fuel check. I don't drain or seal anything. Your results may vary. LOL

Same with our Monte Carlo. More power with the C11, no failed fuel checks.

[Mike Croley]

I guess the folks at Renegade Racing Fuels were reading this thread . The opening page on the Renegade site renegadepro1.com has been changed to reflect a lot more of their automotive race fuels .