Posted By: fowl play
Race gas octane - 09/25/18 08:00 PM
Need opinions on octane.13 to one 414 inch small block. Any difference going from 110 Sunoco to 112? Thanks
Race gas octane
Posted By: DoubleD
Re: Race gas octane - 09/25/18 08:22 PM
With 110 and 13-1 you are on the edge of the fuel spec - 112 is rated for up to 15-1
Probably will make the same power and you will not notice any difference between the two depending on how conservative you are with your jetting and timing. If you get aggressive with the tune the added octane helps.
I have 13-1 in my HEMI and run VP 112 - the main thing about buying race gas is where you get it from and how pure it is - I buy sealed barrels or cans - I never completely trusted the stuff at some tracks or local gas stations
Probably will make the same power and you will not notice any difference between the two depending on how conservative you are with your jetting and timing. If you get aggressive with the tune the added octane helps.
I have 13-1 in my HEMI and run VP 112 - the main thing about buying race gas is where you get it from and how pure it is - I buy sealed barrels or cans - I never completely trusted the stuff at some tracks or local gas stations
Posted By: B3422W5
Re: Race gas octane - 09/25/18 08:30 PM
I ran a 13.1 to 1 W5 headed smallblock for years with 110 with zero issues. 32 degrees timing, 7400-7500 at the stripe.
95% of the time i was pumping the sunoco out of 55 gallon drums i would buy. Known good fuel.
95% of the time i was pumping the sunoco out of 55 gallon drums i would buy. Known good fuel.
Posted By: bigdad
Re: Race gas octane - 09/25/18 09:37 PM
I run Sunoco 112 in mine , buy it by the drum ..
$500 buddy deal
$500 buddy deal
Posted By: CMcAllister
Re: Race gas octane - 09/25/18 10:10 PM
Sunoco was so lousy, I would not try to get away with running it on the edge. Maybe it's different now. Switching to VP made life easier.
Posted By: A/MP
Re: Race gas octane - 09/27/18 02:55 AM
I've run Sunoco with good results. Its not oxygenated like the VP and requires some attention. I'm experimenting with Klotz additive and 93 pump gas. At 12.5 no problems and it will be cheaper than Sunoco or VP. No bad plug coatings. It lasts indefinitely in the metal can. There may be a few HP with the race gas but I'm just running an index.
Posted By: ozymaxwedge
Re: Race gas octane - 09/27/18 03:06 AM
For a quarter of the price try it on Avgas, see if it goes slower
Posted By: MR_P_BODY
Re: Race gas octane - 09/27/18 05:01 AM
It will mater more on your cam and where the
center line is.. I was running 14.1:1 on E-85
with no issues at all
center line is.. I was running 14.1:1 on E-85
with no issues at all
Posted By: dvw
Re: Race gas octane - 09/27/18 11:32 AM
I've been running Renegade fuel for 6 years. Personally we run Pro 114, 15-1. Very consistent. they have 112,113 and more. 114 here is $550 a drum.
Doug
Doug
Posted By: Cab_Burge
Re: Race gas octane - 09/27/18 06:48 PM
I was told years ago by several of Ma Mopar factory backed SO CA drag racers to run the lowest octane fuel possible that did not ping or mark up the spark plugs, lean and cold plugs worked the best, fastest, with BB ,Hemi or SB 
Posted By: mr_340
Re: Race gas octane - 09/30/18 05:59 PM
Originally Posted By A/MP
I've run Sunoco with good results. Its not oxygenated like the VP and requires some attention. I'm experimenting with Klotz additive and 93 pump gas. At 12.5 no problems and it will be cheaper than Sunoco or VP. No bad plug coatings. It lasts indefinitely in the metal can. There may be a few HP with the race gas but I'm just running an index.
http://apkgroup.com/msds/english/MSDS%20by%20Supplier/Winner%27s%20Circle%20(Klotz%20Synthetics)%20(WNC)/KL602(05-08-2017).pdf
Hopefully it has iso-octane (reference fuel of 100 RON/MON) and not n-octane (-17 MON, -20 RON).
https://en.wikipedia.org/wiki/Octane_rating