ok,well i remember reading on the boards about not using anything but low octane for my rotary,,now is that for emissions purposes,,,or for mechanical purposes? anyone know,just a bit of curiosity

 

turbo or non turbo?
non i dont think it matters much but turbo i would never use anything under supreme but you will get all kinds of different answers this has come up soooo many times and it always ends up with an arguement but for me 18cents a gallon more for supreme is alot cheaper than a rebuild and overhaul time once again just my two cents

 

well i meant for an NA engine,so for an NA it dosne matter? life thare wont be det. problems,seal problems? nothing of that sort? oh ya another question though its stupid,,has anyone ever used PROlong on theyre rotary or anything thats usually designated for piston engines,as we all know,the rotary family gets no love! :'(

 

if you have a n/a and your running anything over the regular 87 octane your a morn and your pissing money away.

Higher octane fuel in your n/a will not make it last longer, have more power, or do anything other then cost more. period.

 

^^^yep^^^

 

???
i heard 87 makes n\a's knock so i never put it on?!?!?!?!?!?!?!?! thats y i used 89 -_-

 

who told you that? someone with a safc that has leaned out the mix maybe.

SOME cars like integras have high enough timing and compression to need higher octane fuel to slow down the combustion enough so that it wont knock.

Your n/a rx7 does not.

 

Says in the owners manual to run 87 octane for both NON TURBO AND TURBO.


From personal experience, anything more than 87 in an N/A has undesired effects.


I heard you run regular in a 100% STOCK TII, as stated in the owners manual. If you have exhuast mods and a cone air filter, its recommended to step it up because of increased induction, and heat. Boost creep is a factor too.

 

my 89 GXL runs great on 87

 

Come on, you have 122 posts and don't know how to go to the second page yet?
https://www.rx7club.com/2nd-generation-specific-1986-1992-17/what-octane-s5-na-491978/
I answered the question yesterday dude.

82 octane gas can be used on NA RX-7s due to the thin and long combustion chamber. Low octane for both mechanical and emissions reasons - larger amounts of carbon build and less gas burnt are the results meaning your engine gets dirtier and then doenst give you as much power, costs more, and kills our kids more with gas vapors in the air. In other words never use more than 87.

T2s, now that depends on how much boost you're running... anything more than stock and you need to ask yourself : "is my engine about to ping?"

I've never heard of prolong, but yes, you can pour stuff like seafoam in to clean up the engine/injectors a little bit. Once again, it's widely known that there is an article on snake oils.

 

a factory car...n/a or turbo...runs fine on 87 octane

theres no need to spend more on 91

IN FACT I'd like to see someone who TRULY believes that there is such a large difference take their factory car and do a dyno pull on 87...then drain the tank and do one on 91 - IF there is any difference it owuld be no more than 1 or 2 hp...in other words DICK ALL

the car will run just as well on either octane...some guys put in 91 just because it gives them a good feeling..like the feeling of fresh oil in the motor...whatever floats your boat.

asking that quesiton here is like saying - do you like blue more than green? its more or less opinion - the fact is that your n/a car won't have any pre-igntion problems on low octane gas

 

the higher octane would give you less hp if there is any change at all... the higer octane gas burns slower and less of it would completely burn. More carbon and unburnt fuel would pass through the system. that is not what your looking for to give you self that "good feeling"

 

rotaries wont burn all of more than 91 octane. its a waste of gas and if you think about it your getting less peformance, not noticeable performance... but you do. if you put anything about 91 in, it doesnt fully combust thus you have gas left after the combustion, sort of making it run somewhat rich but not in that way... **** i dunno how to splain it. just dont put in more than like 89 octane unless you have a bad *** turbo engine with high compression n/a rotors

 

rotarys are supposed to run best on an octane level of 85..since that is not available in pump gas,the level is 87..TII's run at a higher level ..89/91..