TUNERS COME IN HERE

Just found this on another website...VERY good information for tuning different race gas setups!

Quote:

Ever wonder if your airfuel will change with race gas? The answer is yes.... Real gasoline has various different stoich points due to the blend, how much ethanol is in it, etc. It is somewhere between 14.1 and 14.7 though. Finding the information on race gas isn't easy. It is not posted anywhere on the internet that I have found. VP does not publish it, nor does Sunoco (TurboBlue) Several weeks ago I got in touch with the chemist at VP and got all the stoich points of their fuels. Last week I got in touch with a Sunoco chemist and got the data from him as well. When I asked the guy from Sunoco why they don't publish the information on the TurboBlue website he said - Quote: Eric - you're right, stoichiometry is important. Fact is many people have no idea what it is - kudos to you for knowing. Unfortunately many folks we talk to think the stoichiometric air/fuel ratio is where they should set their fuel system at wide open throttle. So we are torn about posting or not posting stoichiometry data because of that potential problem. Shocking right? Especially when you see how different the fuels are... Here is a list of the ones I have gathered. Sunoco MO2X UL – 14.5 Sunoco 260 GTX – 14.4 Sunoco 260 GT – 13.9 Sunoco 260 GT Plus – 13.7 Sunoco Standard – 14.8 Sunoco Supreme – 14.9 Sunoco MO2X – 14.5 Sunoco HCR Plus – 14.8 Sunoco Maximal – 15.0 Sunoco MaxNOS – 14.9 Turbo Blue Unleaded (100 octane): 13.9:1 Turbo Blue Unleaded Plus (104 octane): 13.7:1 Turbo Blue 110: 14.7:1 Turbo Blue Advantage: 14.9:1 Turbo Blue Extreme: 15.0:1 VP Street Blaze 100 = 14.16 VP C10 = 14.53 VP 110 = 15.09 VP C16 = 14.77 VP MS109 = 13.41 Back to pump gas.... While I had the Sunoco guy's ear, I tried to get an answer about the stoich of their fuel and to find out how much actual Ethanol is in it, when the label says up to 10%... Here are his comments... Quote: I know plenty about pump gas, enough to say that there is no useful stoichiometry data on pump gas. Composition varies WAY too much, regardless of brand/refinery/etc... especially on the lower octane grades. But I can tell you that Sunoco 94, which is very hard to find these days, will contain some ethanol. Per the first sentence, it will depend on the blend though. I would go out on a limb and say it is nearly 10% most of the time (keep in mind 10% is the max allowed by law). Street gas blends change all the time thanks to environmental requirements (fed/state/local), seasonal adjustments, and price pressures.

here is a link to the entire thread...

http://www.modularfords.com/forums/s...d.php?t=132632

wow, thank goodness this isnt what i thought it was...

ewwwww

Great find for info I am taking some of our Ethanol testers to Hallett to give to the guy who supplies race engines to the spec guys. I showed him the one I carry and how easy it is to test for quantity of alcohol and explained that in Oklahoma the Corp Commission only tests for 3 things Water, Quantity (make sure 5 gal is 5 gal), Octane and do not test for percentage of Ethanol. I have personally tested fuel from Walmart @ 20% and QT @ 30% because it gets blended at the pump head and almost never tested. So his idea of pump gas being all over the place is dead on if they cannot even get close to 10% when required by law.

It gets blended at the pump head?? Wouldn't that mean that QTs would have to have a separate underground tank for storing pure ethanol?

groupset wrote:It gets blended at the pump head?? Wouldn't that mean that QTs would have to have a separate underground tank for storing pure ethanol?

I meant the pump head that fills the truck sorry

Oh, OK - I didn't know where they stored/mixed the ethanol, but I sure never expected it to be underground at every retail gas station! Makes sense they'd blend it on the tanker truck as fuel is being delivered into the underground tanks. I'm also surprised (and more than a little concerned) that the OCC doesn't check ethanol content of fuel along with their other testing.

F%&K ETHANOL!!!!!!

Oldokie wrote:F%&K ETHANOL!!!!!!

x2! I got your back old man!

Luckily, I have been finding more and more stations in the area selling real gas.