BOOSTING OCTANE

I ran it in the last XKE I had without any problems other than one day I splashed the stuff on a diamond ring my Grandfather gave me and the diamond fell into the tank. I wound up selling the car with the diamond still in the tank. It wasn't that valuable anyway.
I would think twice about pouring that into a Ferrari however.

 

Your profile shows you own a 355. It is my understanding that leaded fuel (which is what you mentioned) will kill your cats and/or OBDII sensors. There are unleaded 100 fuels available - I would search those out instead and play it safe.

 

Agreed, go get some 100 no lead race gas.
You can google reasons not to use avgas in your car as well as reasons not to use leaded fuel in your catalyst/O2 sensor-equipped car. The latter are expensive.

 

100 octane unleaded is available at the pump in Fayetteville, and toluene can be added to boost octane numbers. Are you having knocking issues or just trying to gain performance?
A 355 should run fine on pump 93 unleaded.

Dave

 

If Your car is designed for 100 LL then use that , if its designed for 91 pump gas, use that.The myth of " more octane=more horse" is just that...myth, if You don't have the compression ratio or the ability to advance Your timing its a waste of $$$.

 

A) lead will kill various engine parts (expensive ones)
B) No more power is produced beyond 96 octane
C) there is plenty of 104 noLead gas available

 

I have the same talk with my wife and son they want to put Premium gas in the Jeep from time to time to make things run better... I tell them spend the extra money by washing the car it has the same effect.

 

A chipped 997 Turbo might benefit from some no lead 100 octane.

Lead will kill the cats in a modern car quick, and cat killing is expensive, what with their platinum innards.

 

In Ft. Smith Fenneys on Towson has 106 unleaded real pricey (7.50)
mostly sell it to the guys for the stock cars, I put some in my mercedes could not really tell the difference other than the exhaust odor

 

i raced boosted cars for yrs. adding race fuel and not advancing timing will make you slower. why do it? most people think race fuel will make you faster because it says race in it. you only need it to control detonation. if you had a high compression motor than yes but 11 to one is not high compression. adding boost raises your compression and that's why you need race fuel to keep the burn controlled so you do not detonate and blow a head gasket your melt a piston.

save your money. i ran 10 to 1 with 36psi that needed 116 to be safe but i ran 19 psi with 100 octain. you can go just as fast with lower octain with the right tune. ulness you are tuning your car for it your waisting your money IMO..

good luck.
Mark

 

Octane ratingsa on pump gas is ONLY an indicator of the fuels ability to avoid/prevent DETONATION-it in NO WAY is an indication of added/increase thermal energy increase in terms of BTUs available to be captured via a flame front....
ITS JUST THAT SIMPLE.
Also, ddetonation is dealt with in 2.7 and later systems utilizing pizeo-electric sensors known as "Knock" sensors and will retard timing at a rate of 2 degrees untill sensor says its stopped...the rreste in 2.7 is incredibly slow by todays standards, but is a good benchmark indicator of 20 year old application of technology...

 

AV gas is refined to be a lighter fuel as aircraft are weight conscious vehicles. The 100 octane rating will burn cooler and reduce detonation but as a fuel it is not a true power builder like race gas.

you stole my thunder!

Your definitely are not getting your moneys worth without the compression, boost, & timing. But the engine will still run cooler smoother and better.

 

If you were to really split hairs, higher octane fuel actually has less energy. As has been mentioned, race cars run it so the fuel doesn't ignite from as a result of air heating up during compression.


GT

 

Why is there a difference between the two in regards to power?

 

arkferrari,

Please don't use jet fuel in your Fcar. Jet fuel is a form of kerosene (JP4, JP5, JP8, etc.,). 100+ octane aviation gas is for piston engines and I believe it uses lead to get there. Lead will poison your cats (make them ineffective) after a short period of use.

As others have indicated there is no more energy in high octane gas. Octane is a measure of a fuel's ability to avoid detonation or preignition. Horsepower and torque come from an allowable increase in CR, which helps everwhere, and allows more advanced (earlier) ignition timing, up to a point. It is my understanding the high octane gas burns more slowly and does not have as much tendency to explode A/F remnants toward the end of the power stroke.

Bill

 

328turbo

You posted "AV gas is refined to be a lighter fuel as aircraft are weight conscious vehicles. The 100 octane rating will burn cooler and reduce detonation but as a fuel it is not a true power builder like race gas."

AV gas may be a lighter fuel. I do not know if this is correct. the density liquids are normally measure by specific gravity, this is a percentage of the weight of water under standard conditions. Any weight savings do to specific gravity in gasoline are probably insignificant even for an aircraft.

Bill