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Back in the 70s, high octane fuels allowed for more aggressive timing on the vacuum advance... it would also allow you to run high compression pistons. If you remember, even back then, once you made your modifications, you could never go back to lower octane fuel. The reason for this is that lower octane fuels would cause "knock" which would eventually destroy the engine.
Back in the 70s 9:1 was considered "high compression" in some circles, with rudimentary chamber designs :p
 

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your car is designed for it.
you'll get slightly better mileage & power on premium.
a car not designed for it will just burn money.
Designed for "it" you mean higher octane? no sarcasm i have done nothing more than put gas in my car lol.

If that is what you mean, could i use 98RON? I'm not actually going to do it but just want to know.

i love learning about my vehicle. :nerd:
 

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98ron is totally fine and in my case gives better mileage than 95ron, just enough to cover price difference


however not all 98ron fuels are the same, as it highly dependent on production technology used. Some may have better washing additives, some may have more density than others (which matters when fuel system pushed to the max), some may have higher caloric content (like 100ron may be more detonation resistant, but produce less energy than 98ron). This is a rather complex topic and honestly no effect on regular user, unless you are racing.

Additionally RON poorly represents what kind of fuel you get. I like US AKI, as it gives you idea about both RON and MON. Take a look at the comparison of top tier brands for 98-100RON where i live, and notice how different AKI is.
Density - higher=better
Oxygenenates - as MTBE is 30% less calorific than pure gasoline, so more oxygenates in fuel make it less calorific. Less oxygenates = more calorific fuel.


 

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Pump gas sucks.


Its crap, everyone knows it. Unless you are engineered for Ethanol, its horrible. Draws water, is caustic. Grows algae apparently as well.

No ethanol fuel is the best regardless of octane. It providing better mileage is a mathematical certanty, not opinionative. One cu. cm of no ethanol provides more btu's in comparison to the same octane rating of any E-fuel. They use ethanol because its cheaper to use than more complicated fine refining necessary to make higher octane no ethanols.

***There is a reason the manufacterer recommended fuel for Porsche, Ferrari is Shells V-power NO ETHANOL 93.

But most could give a damm and just throw whatever is convenient in there,...LOL.

So if you can get it, use it. Your car will love you for it. There will be less crap in your catch cans, especially in winter.


But most dont give a dam, and throws whatever is cheapest or convenient,,,LOL.
Some tuners engineer the tune to a specific octane if you ask, but--The lower the octane the less whp you WILL get. Period.
Hotter tunes at minimum require 93. Turbo 3.8's demand at least 94,..(They kind of hide that fact in the literature).
 

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E10 isn't all that bad. Been using it in Illinois since the late 70's. It is corrosive to the older plastics that were used and current plastic hoses in some outdoor power equipment. It does absorb moisture if open to the atmosphere. It then can cause rusting issues if water is allowed to accumulate. But for the most part ethanol will remove any water in the gas as long as the concentration of water does not get to the point of saturation when the water and ethanol will settle out.

The turbo loves ethanol due to the cooling effect of the alcohol absorbing heat, lowering the temperature inside the cylinder before the plug fires.
 

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Ethanol has only 68% of the btu's of full fossil fuel gasoline. Ethanol also has a lower vane exhaust energy. Which means its exhaust gasese are weaker. So yes it wont turn the turbo as efficiently, and your overall speed of your exhaust gases are slower. No ethanol is superior by any empirical measure thats just a fact.

-is it more expensive, yes.
-is it convenient,..not for some.

In many midwest states and in the south, there are quite a few no-ethanol providers. Or near heavy marine sport area. Worth the trouble is all I'm sayin.



Now a true E 85 setup is quite good. But it requires a complete overhaul of the entire fuel system. New LPFP, humongous injectors and the custom tuning to go with it.

ETOH engineer can chime in here. He has a true E-85 race car setup.

I get it, its all there is,..or so it seems. But not really.
 

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Ethanol has only 68% of the btu's of full fossil fuel gasoline. Ethanol also has a lower vane exhaust energy. Which means its exhaust gasese are weaker. So yes it wont turn the turbo as efficiently, and your overall speed of your exhaust gases are slower. No ethanol is superior by any empirical measure thats just a fact.
This goes into the theory of for heat vs. flow/volume for what runs the turbo.
All I will say, is that there are plenty of E85 high boost engines running around :p

It's nice to have the options in fuels to use. If I could, I would go with a Haltech with a flex fuel sensor.
 

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For all of us using oem fuel rails,injectors and pumps it means alot. Btu per cc has a huge impact on power.

Sure sky s the limit if you just jam boat loads of E85 in there, plus its 105 octane. But ETOH engineer is the only one I know of on here personally with this ability.(And yeah he's a real engineer in the fuel buisness).

I'm I fuel Nazi because of my setup. High compression pistons and forced induction demand it, if you want stability and reliability.
 

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Shell 93 by far the best, but for those that need to strap the belt around their waist, it is a great option that you can go for 87 89 91 93 with the Gen.
 

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Shell 93 by far the best, but for those that need to strap the belt around their waist, it is a great option that you can go for 87 89 91 93 with the Gen.
Shell V-power NO ETHANOL 93 is the best,..very hard to come by. Tends to be in cities with large populations of exotic cars,..last place I saw it was in Sea island, north of Charleston SC. Also in wealthy suburbs of larger cities.

The E10 V-power 93 is OK, has the best chemical add pack though..........This was verified to me by a fuel engineer pal who works for VP racing.
 
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