Which is better? Higher or Lower?

 

Unless she's turbo charged, feed her the lowest octane you can find. Rotaries need a fast burning fuel, not a slow one, so the lower the better.




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What Kentetsu said. I've heard that Mazda used to bring their own 85 octane fuel to races.

 

I thought so, someone told me to put in 91, guess they are stupid and i should not listen to them anymore haha.

 

^Racing Beat says 95 to 110. But, I do agree with running the lowest you can find.

 

Like they said, unless its turbo/supercharged lower octane is better.

 

if you want to learn about gasoline look here. https://www.rx7club.com/rotary-car-performance-77/great-article-946838/

 

That would be for boosted applications

 

lowest thing here is 87 and that's what i run.

 

I'll post it on here tonight. I'm pretty sure it was referring to Periph and Track only use. You run higher octane because of the fuel vapors.
I have a 87' and a 98' catalog.
But you're probably right.

Good quality unleaded fuel is best for spark plug life. In racing, it is desirable to use moderately high octane fuel (95 to 105 octane) although even 90 octane may suffice. More important is the "vapor pressure" of the fuel, especially in warm weather and at high altitudes.

The higher the vapor pressure, the easier the fuel boils. It is possible, indeed common, for fuel to boil in a carburetor float bowl. When it does, the mixture is leaned out and performance suffers.

Taken from the Racing Beat Website.

 

Never used anything other than 87 outside of testing to see if mileage improved on higher octanes (it didnt). Never had an issue.

Wish I could find some non-ethanol gas, but in Cali that's not gonna happen.

 

Same in NJ, its been 10% ethanol for about 7 years now...

 

Yea I agree with everyone else pretty much... lower is for the moat part better unless you have forced induction...

 

in the competition prep book mazda recommends 90 MOTOR octane. at the pump, we use an average of motor/research octane, so 90 motor, is like 91-93 at the pump.