i have a 2004 rx-8. currently i run premium gas. i'm pretty sure that it is 91 octane. i was wondering if anyone else has had any luck running higher octane. i was thinking about mixing about 5 gallons of 110 or 116 octane with a fillup of premium. any suggestions or trial and error guys. thanks, tk. west portland

 

why?

 

i heard some of my friends running higher octane and got a lot better performance out of their cars. but none of them have rx8's. i also heard one would have to change the computer using a programmer to make good use of the higher octane gas?

 

is this stuff unleaded? that is your first problem...

# 2 if you do not have fi, you are pissing in the wind..

beers

 

yeah its unleaded. i'm pretty sure the gas stations all are unleaded. and yeah my rx8 is fuel injected....i havent tried running a mix of 110 oct and 91 oct. but i think i will try it soon.

 

fi stands for forced induction...

ie turbo or sc...

i dont think anyone can help you.. good luck..

beers

 

Higher octane will reduce the amount of horsepower in an engine that isn't tuned to run on it. And if the engine is tuned to run on it, then you won't be able to run lower octane without major problems. Octane is essentially resistance to burn. You'll get the most power out of the lowest octane that won't cause detonation. A lot of people blow a lot of money on high octane fuel (110 racing fuel is very expensive) because they don't understand gasoline.

 

Yup What skinless said... Very True, the Suzuki Hayabusa runs best on 87 Octane... You can feel the improvement if you run premium for a little while then switch back to 87... Folks have spent hours discussing this and going round and round...

Really Really, Octane alone does not equal more power.

 

FI only stands for Forced Induction in Bizzaro Land Bro... Universally and through out the industry FI stand for Fuel Injection.

FI only stands for forced induction this time because that is how you chose to use it.

 

I would disagree with you. How many cars can you name that were made from 2004 onwards that don't have fuel injection? So why on earth would anyone ask if you have Fuel Injection? It's illogical.

While FI might be an acronym for Fuel Injection, it's more widely used for Forced Induction. If you want to talk about fuel injection, use EFI instead.

 

Actually, I take that back. I can't be sure which acronym is more widely used. But as far as logic goes, pretty much every new car has fuel injection, so it's a given. Rarely will someone ask about it. Kinda like asking if your car has tires.

 

so you don't remember the old days when Fuel injection was like - woooooow , you must be rich !

 

and mechanical !!!!

beers

 

Getting back on topic...

I remember reading threads a while back about running premium octane gas in older rotaries (that were designed for 87 octane) and that it causes a lot of carbon buildup in the engine to the point of seizure ("carbon lock.")

http://www.atkinsrotary.com/index.php?pag=8#32