Octane

[Bijou-MP5]

I put..89..simply because 89 was cheaper than 87 at BP gas station
I don't know why

 

[IainK]

Over here in Oz, the best we've got is 98RON. We need 100RON to run a lot of Japanese imports (like GT-R Skylines, Supras, RX-7s).

To get around this, many people (illegally) run C16 (116RON) or Avgas, while highly-tuned V8s normally run C16 or methanol since running avgas on the street attracts a $AUD55,000 ($US27,000) fine.

 

[akhilleus]

clog what cats?:bs:

 

[igdrasil]

I run 93 on my 8psi turbo protege5

 

[Protege52003]

I run 93 on my 8psi turbo protege5

...jealous here. only can wish that i had a turbo for now. need some more funds.......

-R

 

[Dad]

Mazda recommends 87 and that's what I use, the cheapest name brand gas I can find. I never have any pinging so as far as I'm concerned, low octane = no ping = less $$$. As mentioned previously, many high performance engines, especially turbos will only make max power from higher octane 'cause the engine management will retard the timing if it detects ping, thus lowering the output. Pure high compression (think 60 muscle cars) will demand high octane so the engine doesn't eat itself alive. Someone once described ping as hitting the top of your piston with a ball peen hammer.

 

[igdrasil]

Mazda recommends 87 and that's what I use, the cheapest name brand gas I can find. I never have any pinging so as far as I'm concerned, low octane = no ping = less $$$. As mentioned previously, many high performance engines, especially turbos will only make max power from higher octane 'cause the engine management will retard the timing if it detects ping, thus lowering the output. Pure high compression (think 60 muscle cars) will demand high octane so the engine doesn't eat itself alive. Someone once described ping as hitting the top of your piston with a ball peen hammer.

actually when the piston hits the cylinder walls; thats the sound of pinging, thats what actually is happening inside.