87 octane?
 

safe to use in turbo s4 fc?
thanks

No.

91 or better.

It is safe if your car is ONE HUNDRED PERCENT BONE STOCK. Mazda does recommend 87 for the T2.

thats not what the owners manual says. lol it says 87 octane for the N/A and pemiumfor the T2. even the car has a sticker on it that says pemium only.

Definately want to stay with the premium. If you don't, after a few tanks the car will not be happy.

Stay with 93 man, your way better off not even chancing it. I wouldnt even use 91

Would the 104 Octane booster be even better? Or is not always more of a good thing a better thing?

you might get 89 octane after that "booster" it has been proven before. best bet, use pemium fuel, why take the chane of detonation and destroying you engine.

premium is always the best

More Octane = More resistance to detonation. The turbo needs 91 or better to resist detonation, any more octane is not good or bad for the car. 104 Octane would allow a tuner to advance the car's timing and make more power then you could on 91/93.

i use premium on my N/A
its not that much more ^_^

rotaries that are non turbo make more hp with 87 octane than with 91 or 93.

Hella, why not buy 87 octane and start paypalling the difference to me?

That way you pay the same amount but don't waste any money!

I wouldn't bother getting much higher than the recommended or you're just gonna waste money, but don't go under the recommended.

91 min

this is what i get for not having a manual lol
thank god i posted i prolly would've ran with it

I would never use anything less than 91....preferably 93.

I have two owners manuals one from an 1989 TII and another for and 1987 and they neither say that it is required to run premium for turbo. Both say 87 or higher. If you have any mods done you may want to run 89 just be safe.

A stock turbo II is designed to run on 87. Anyone who says different is a liar.

Yes it will run on 87, if it is a bone stock engine!

No one has said otherwise. :dunno:

you are asking for detonation

However, I wouldn't recommend beating the piss out of it with 87... wait, a bone stock TII won't let you beat the piss out of it.

DO IT!

god damn man everything on here turns into an argument.


Run premium in your turbocharged car. That shit is a no brainer mate.

Sure there are a hand full of doug funnies on here that say its ok, but youll have that in any subject..... You know, the whore that told you she was "on the pill", or the dousche bag that told you "the cops dont watch THAT road". Id just play it safe and spend 3-5 more dollars on a tank of gas.. is 3 dollars or whatever really worth it? comeon.


and as far as what anyone or anything from 1987 told you, id pay no attention to. Id use the following 20 years of testing people have done as opposed to the mazda magna carta you found in the glovebox.

Like several knowledgeable people have said Mazda recommends 87 octane. unless you are boosting more than stock you will have reduced engine performance on higher octane fuel! You can run a higher octane rating fuel if you are worried your engine has carbon buildup, thus having hot spots, creating detonation.

Mazda designed the car to run on 87. But I guess all you kids who have been here for a month are smarter than Mazda right?

:rolleyes:

:icon_tdow Most of you obviously live in the US. You fill up with premium instead of 87 over here and its a good $10-15 more every tank without fail!

hold on now buddy, I have been around rx7 for a long time, and i know what adversed affects of a T2 that was ran on regular BONE STOCK for the course of its 62000 miles of life was. its called detonation. before you smart off and get an attitude, take you engine apart and look at it. maybe the car was designed to run on 87, i have a tech sheet that speakes diffrent. you tell me, mazda of yester years or todays mazda. alot has changed and to call someone a liar that you dont even know, that thats balls buddie. this is exactlly why it took me so long to to join this fourum is because i know theres allways arguments. Its rather funny how some people can that a discussion and turn it into a pissing contest. Im done

I'm sorry, you're right. Mazda had sooooo much more to gain by saying the car would run on regular rather than premium. Maybe you should post your tech sheet instead of just claiming you have one. Also while you're at it would you please explain to the rest of the people running on regular how their engine defies the laws of physics. Thousands of people have run on regular and their engines lasted 125k+.

91 or better
 

I only run 91 in my car with a little two stoke oil

I only run c-116 in my na, everyone tells me it's overkill but I figure I should do it for the detention resistance right?

:rolleyes:

???
 

how much better does it run with that

Wow.

:lol::lol::lol::lol::lol::lol::lol::lol::lol::lol:

This thread made me LOL!!

*ahem*

Let's start from the beginning my young n00blets:

I assume that you all know what octane is and what the rating is for. If not, please utilize that fine search option at the top right hand of your screen, or simply use google.

A rotary engine prefers a quicker burning fuel. NA engines will actually run better and possibly achieve better mileage with 87 octane. A stock TII owner's manual IIRC, says to utilize 87 octane. HOWEVER: Know that most of these cars are modified and as such, fuel amount and octane should be adjusted accordingly. Lastly, if you don't know what you are talking about, please refrain from spreading ill-informed opinions, conjecture, and hear-say. This is a new member section and people come here to learn facts. Not "my friend" or "I heard", just facts.

Yes, it is fine to run on 87 if it's a stock S4. 91 or 93 is recommended on S5's. Enough of this.

Same here I read the owners manual


ive been using premium doesn't seem to like it, I have s4 I'm about to revert to 87 or 89 which ever I find lowest on the pump


ill message back with the results

If the engine is not running well on premium fuel, then there is either something wrong with the engine or with the fuel. If it is the engine, then lower octane fuel may make the problem worse and even cause major damage. What exactly do you mean by "doesn't seem to like it"?

OK, just find another 8 year old thread and attach your results to it. ;)

If you have hints of detonation then go for the premium, if not then 87 it is.
Just be carefull, d3tonation is not always easy to hear-spot.

I would agree that 87 with no detonation would be just fine.

All turbo engines require premium fuel 91 or higher to run to there optimum performance
as well as using full synthetic oil

Its amazing how these myths continue even in the age of the internet where it is easy to find the correct information. :facepalm: