Race fuel, Needed or not???
 

I have been mixing c12 and 93 octane. I have people telling me I need to use C12 fuel. I have others telling me I don't. If I need it, I don't mind using it. If I don't, I would rather save the $400 per tank full. My engines are 8.5 to 1 and I am running about 7 lbs of boost. i have just over 1,100 HP. Is there an accurate way of figuring out if you need the extra octane?

Re: Race fuel, Needed or not???
 

Who built the engines call them.

Re: Race fuel, Needed or not???
 

Yes.

My engines will run on 93 if they need to but I go ahead and run 110 for piece of mind.

Re: Race fuel, Needed or not???
 

at 8.5 to 1 and 7lb's of boost with a innercooler, I will post a chart.

Re: Race fuel, Needed or not???
 

Re: Race fuel, Needed or not???
 

I think the chart is with no innercooler. Talked to BDS and they said, as long as you are at your max rpm, you are not going over 7lb's of boost of innercooled air, 93oct is what you should run. Thats with alum. heads and a 12 to 14:71 blower.

Re: Race fuel, Needed or not???
 

I am at 9lbs on 93 only :drink: no boom yet :eek: We Dynoed it at Precision Marine past 9 lbs and it picked up some detination so we put it on some race gas and went up to 11.5lbs of boost with no detination :D

The motor in My old Scarab was at 11.5psi on 93 with no probs.Tuned it on Oddys Dyno :drink:

Rob :drink:

Re: Race fuel, Needed or not???
 

Other factors to consider along with simple boost/compression are inner coolers, aluminum heads, and blower size.

Re: Race fuel, Needed or not???
 

I have 14-71's, Aluminum heads, intercooler, mechanical and electric fuel pumps. I figure the last thing I need is to ber kicking Rio Roses Ass and having a problem because I used 93 octane! :D :p

Re: Race fuel, Needed or not???
 

sounds like all that and 18lb's of boost, real good gas and you will be ready......no excuses.