mwerthman

I am looking for recommendations for octane boost.

Is there a brand that is better than others?

08'MustangDude

For what is it going to cost you for a bottle of octane boost, just buy it at
the pump.

If RUG 87 is $2.85 a gallon, and you buy a $3.50 + Tax bottle of octane boost?
Ten gallons now cost you $3.20+ a gallon. Some brands cost even more, so there's
no point in it. You can spend up to $5.00 for a bottle of it, and that would bring
your cost per gallon to $3.35/gal. Why? When 91 costs that at the pump...

You're better off tossing a bottle of Marvel Mystery Oil in the tank before filling, it will
essentially do the same thing; raise the octane (resist detonation), and clean the system
up. The MMO will prevent detonation too, just not in the same way octane does.

All octane does is prevent gas from detonating under compression, so it will ignite
at the spark. Unless you're boosted, or have a VVT motor, there's no point in using
anything above 87. E15 (88 octane) is .5 cents/gal cheaper at Sheetz.

Why do you think you need higher octane fuel?

mwerthman

I have a 2007 Shelby GT500 with 560HP at the rear wheel with 700ftlbs of torque. I just put it on the dyno and it is putting out 21psi of boost. The tuner recommended either running race fuel, if I was going to be racing the car or at the very least run a can of octane boost, with 93 octane, while running around town cruising. Since there are not many places by me, Lake county Illinois, that sell race fuel. Plus race fuel is more like $5.00 per gallon correct?

08'MustangDude

If you want to race it, then run E85, it's always 100+ Octane, to 105.

The only things truly required on a 5.0 (S197 and S550 models) are fuel injectors and tune. That being said,
it is never a bad idea to look into an upgraded fuel pump since you will be pushing more fuel throughout the
engine. This would be for full time E85 use. I use E15 in my 2007 V6, and there is a no-no inked notice on
my cap for E85. Some have a no-no with E20 / E85 in it...

Octane itself does not increase horse power. It prevents detonation, which results in
knocking, which caused the ECU spark timing being retarded, thus reducing engine
output. Running 93 from the pump should be fine. Plugs may need to be gaped
less, to at least 0.28?

Or, you can put 3/4 tank of 93, then the rest E85, or typically 70% E93, and 30% E85.
All the new sheetz locations going up have E85, E15, and the rest.

All 2002 and up cars can run E15, you can run E85 for short periods of time only, because
Ethanol evaporates, and leaves water behind. That and any condensation, or water drops
entering the tank from snow or rain, makes it worse. The corrosion is from the WATER,
not a chemical. This is why E85 cars usually have stainless lines, and metal tanks.
Plastic tanks, no, the plastic is permeable, and even a PLASTIC one will disqualify a car
from a PZEV rating. PZEVs can generally run E85. Older cars with steel fuel lines, they
corrode from the water, not the ethanol. Ethanol does cause issues with fuel injector o-rings,
but you can upgrade to the correct ones. I have been running my '15 VW TSI (PZEV) on E15
for 8 months. I can also run E85 if I wanted...

The right mixture E85 and 93 showed no timing pulls (retardation) on stage one tunes for GT500.

fastbackford351

If you want an octane boost you could take your gas can out to your local airport and buy some 100 octane low lead aviation gas. It's a lot cheaper than buying racing fuel from the pump, which here is over $10.00 a gallon from Sunoco. You don't want to mix in too much avgas though because it'll run like crap at idle. It runs like a raped ape at full throttle but is a dog chugging around town.

I was talking with a petroleum engineer at Castroil and he dropped some knowledge on me because I was running about a 50/50 mix of avgas and the normal sludge from the pumps in my fastback and he said that was way too much and at most I should run 1/4 to 1/3 avgas to the normal sludge and probably don't need near that much for a good octane boost. I asked why that was and he said that the airplanes are designed to run at full throttle.

Coosawjack

http://www.gnttype.org/techarea/misc/octanebooster.html

1 Alibi 2

$ 10 / gal.
.

.

08'MustangDude

https://www.sunocoracefuels.com/fuel/260-gt

ZEN357

I used to an octane boost in a Z/28 I had with and MSD ignition. I would Run Sunoco 94 and then with Octane Boot it would kick it to about 101 or 102 Octane.