[ck98vteC]

Anyone here used 100 octane gas in their car? I have used 94 Ultra at Sunoco, but I wonder if using 100 octane would hurt the emissions or the cat. And does it help performance?

 

[that one civic]

what the hell kind of compression/boost are you running that requires 100 octane gas?

 

[H22Coupe]

100 octane gas is perfectly safe, any higher octane fuels are, as long as they are unleaded.

 

[klungemonger]

If you have a stock 98 sohc VTEC you are wasting your money on any premium fuel, IMO. High octane is basically less flammable so that under high-pressure/high-heat conditions it won't ignite itself (like a diesel) before the spark plug fires. Your engine is designed to operate fine on regular pump fuel.

 

[phatboy555]

i don't think it'll hurt your car any, but it most likely won't help it either...unless you need that high of an octane rating

 

[klungemonger]

i don't think it'll hurt your car any, but it most likely won't help it either...unless you need that high of an octane rating

That's my view also. No help, no harm.

So my advice is: save the money on the expensive fuel and put it into some mods that WILL require the higher octane fuel!

 

[PAC-MAN]

you're safe up to 102 octane, after that it contains lead.

 

[RageAgainstNate]

You will actually lose power by running 100 octane in your engine. The reason for higher octane fuel is not to produce more power, but to guard against detonating. Lower octane fuel actually burns hotter and faster then higher octane fuel. If you do not have the compression to require that fuel, then you are using fuel that is not burning all the way and losing power/fuel economy.

 

[superstar19]

you're safe up to 102 octane, after that it contains lead.

So how does NOS Octane boost work and do?

 

[OdiedogCX]

The benefit of increasing compression ratio is to increase the torque output of an engine. The harm in raising the compression ratio is that cylinder pressures increases in a linear fashion as compression ratio is increased. An 8:1 compression ratio yields compression pressures of about 275 psi, where 15:1 yields compression pressure of about 575 psi. At the time of ignition the pressures will rise 3 or 4 times the compression pressure. Also, when an engine has been modified where even a slight increase in torque is achieved it is important that detonation is not allowed. The noise of detonation of a high-compression ratio engine using the correct grade of fuel is much harder to detect than that of an engine with a much lower compression ratio burning lower octane fuels. 1 Thermal Efficiency -Thermal efficiency is the measure of the efficiency and completeness of combustion of the fuel, or, more specifically, the ratio of the output or work done by the working substance in the cylinder in a given time to the input or heat energy of the fuel supplied during the same time.