Stevo970

If i buy 93 Octane gas will that make my car run faster or slower or what will it do. what are the pros and cons of this.

Scott 89t2

slower, but you probably won't notice. unless your timming and ecu has be made for the higher octane it's pointless.

Stevo970

thanks man for the reply : P

Icemark

The only advantge of higher octane in a NA is the detergents in the gas.

Unless you advance your timing and reset the idle, then there is an advantage to using better octane than 87.

Amur_

This comes up about once a month. The bottom line is that unless you're driving a turbo, buying fuel above 87 octane is like throwing your wallet in the river. Octane is solely a measure of the fuel's resistance to detonation. Higher octanes *do not* by themselves 'clean' your engine or burn cleaner or produce more hp. Fuels that claim to clean your engine have additives in them.

Detonation (or pre-ignition) is not much of an issue in non-turbo rotaries. Among other things, the characteristics of the chambers inhibit detonation.

Here's a thread that beat on the topic quite thoroughly...

https://www.rx7club.com/forum/showth...ghlight=octane

mazdaspeed7

I spent some time messing with my timing with different octanes, and I my car feels much stronger in the bottom end with 89 octane over 93 octane. For both, I had my timing advanced to just before the point where minor detonation would occur. I think premium is a waste of money for a n/a.