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Old 04-15-2016, 08:38 AM
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racefuel

its harmful for engine or how to use it safely
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Old 04-15-2016, 08:39 AM
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Old 04-15-2016, 10:15 AM
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W204 C63 Bone Stock; E36 M3 Supercharged 400WHP; X5 parts eater
Try UNLEADED Race Fuel. Like Sunoco 250 GT
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Old 04-15-2016, 10:22 AM
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2011 S63, 2005 SL55
Lead and MTBE! Great stuff.
highly oxygenated (MTBE) makes more HP for sure but you must tune for it and larger injectors might be needed. Very expensive fuel. I used to buy it 54 gallons at a time.
Then E85 came out. We make the same HP with it now and it's 1.75 a gallon vs 19.00 a gallon. Miss the smell though. Kind of a mix of cotton candy and Red Bull.
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Old 04-15-2016, 11:37 AM
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but what about harmful if i use 93 oct for daily use and racefuel for drag

with eurocharge tune and headers
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Old 04-15-2016, 11:43 AM
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Lead will kill your cats. You have to tune for race fuel or wasting money. I don't know if you can get E85 where you live...
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Old 04-15-2016, 11:50 AM
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Like others have said, get a tune for it and use an unleaded fuel. I use VP MS109 at the track.
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Old 04-15-2016, 02:07 PM
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Do not use. The label clearly says "CAUTION - Contains Tetraethyl Lead". That will kill your cats.

Here's the intro to a really good article about different fuel choices and how they impact performance.

There are a lot of myths surrounding the various types of gasoline we use in our street and race cars. Which one will help us get the most power? Which one is the best bang for the buck? Do we really need race gas? If so, which type? There’s precious little data to back up many of the claims we’ve seen touted as the gospel truth, so we figured it was time to shine the light of knowledge and science on those guesses and half-truths.
https://grassrootsmotorsports.com/articles/fuel-truth/
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Old 04-15-2016, 02:31 PM
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Good stuff.
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Old 04-15-2016, 03:27 PM
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Hard to beat the smell of the old race gas.
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Old 04-15-2016, 03:31 PM
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Use an equal mix of MS109/93oct on your last two gallons of gas. Run the car hard until you are ready for your next fill up. Then add in MS109 purely, the computer should adjust timing a bit.

Again if you want to get the full advantage of any race fuel get tuned for it. Using the method above will net you a mild gain in horsepower.
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Old 04-15-2016, 05:05 PM
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Who is this guy?

You're starting ridiculous / broad threads that have been covered many times. Such as the header thread.
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Old 04-15-2016, 05:08 PM
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Don't feed. He'll go away.
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Old 04-15-2016, 05:17 PM
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Race fuel will pop the rivets on your floor pan just as your manifold is in danger...
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Old 04-16-2016, 03:31 PM
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How is this

how good is this Racing Fuel brand
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Old 04-16-2016, 07:12 PM
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Anyone using E85?
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Old 04-16-2016, 07:26 PM
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https://mbworld.org/forums/c63-amg-w204/550772-e85.html (thread literally halfway down the page)

Don't use it, there is no point for us.
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Old 04-16-2016, 07:39 PM
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E85 is gods gas for race cars.
It breaks the old rules.
That being said, larger injectors and tuning are mandatory.
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Old 04-16-2016, 11:21 PM
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Because I'm supercharged and nitrous setup I always use C16. I feel safer because the high octane never have a issue with my sensors.
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Old 04-17-2016, 09:38 PM
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Re E85, from the Grassrootsmotorsport link above where they dyno tested seven or eight different fuels (notes in parenthesis are mine):

"The E85 is a highly oxygenated fuel. A considerably greater amount is required for it to run correctly at the optimal air/fuel ratio. How much greater? Try an average of 63 percent more fuel at the same rpm and load. (With larger injectors,) All that extra fuel did allow us to bump the timing by 2 degrees. We saw an additional 7 horsepower over baseline (about 5%), with a corresponding gain of 4 points in torque (about 3%).

TAKE-HOME MESSAGE: Possibly one of the least expensive horsepower gains per dollar we’ve seen, but only if you can tune for it . . ."

More at https://grassrootsmotorsports.com/articles/fuel-truth/
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Old 04-17-2016, 10:21 PM
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Nope they are wrong. E85 even though it carries Oxygen molecules, they don't release O2 to aid in combustion.
MTBE "cracks" the alcohol that releases the O2 to aid in combustion.
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Old 04-19-2016, 01:53 AM
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Originally Posted by zcct04 View Post
Re E85, from the Grassrootsmotorsport link above where they dyno tested seven or eight different fuels (notes in parenthesis are mine):

"The E85 is a highly oxygenated fuel. A considerably greater amount is required for it to run correctly at the optimal air/fuel ratio. How much greater? Try an average of 63 percent more fuel at the same rpm and load. (With larger injectors,) All that extra fuel did allow us to bump the timing by 2 degrees. We saw an additional 7 horsepower over baseline (about 5%), with a corresponding gain of 4 points in torque (about 3%).

TAKE-HOME MESSAGE: Possibly one of the least expensive horsepower gains per dollar we’ve seen, but only if you can tune for it . . ."

More at https://grassrootsmotorsports.com/articles/fuel-truth/
stange you needed so much extra e85 normally it's roughly 30% more fuel quantity.
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