Octane b16a

Just curious... what do most people use in their cars: 87 octane, 89, or 91...?

Does 91 make a difference if you have a b16a?

I'm pretty sure you are supposed to run higher octane gas in the b16. I think it reccomends 92 or something. I just remember when my friend was gonna get a 99 si, he mentioned you had to put high octane in it.

98 octane in my SiR. No way would anything less be good for the JDM B16A.

I use 95 octane for my B16, I can also get 98 octane here, don't know if it makes a difference have to try it sometime.

best pump gas we can get is 93 :(

96 or 98. its all the same crap around here. In fact I think the 98 is of such a low quality my car runs better on the 96.

I don't get it, why does the U.S. only get 93, while other countries get 98?

why does a 5.0 mustang only make 225 hp? Some things just dont make sense...

:lol2: That was a good one.

I think 91 is the highest octane for CA... I heard about some station in LA that sold higher octane (98?), but the price was crazy like $4/gallon.

Originally posted by CRX586
I think 91 is the highest octane for CA... I heard about some station in LA that sold higher octane (98?), but the price was crazy like $4/gallon.

That's about our average price for the cheapest gas, gas prices are crazy over here :mad:

Originally posted by Moppie
96 or 98. its all the same crap around here. In fact I think the 98 is of such a low quality my car runs better on the 96.

I had a bad batch of 98, but only once. I just find that the car runs smoother on 98 than on a hot day with 96 :)

would 91 be bad for it b/c it's all we can get

What brand of 98 do you use.

You cant get any 98 in the south island so im running 96 (well its currently less than that I forgot and put $20 91 in it)

I heard that 2 companies sell 98 and one is pretty good and the other is rubbish...unconfirmed rumour though

Anyone heard that Challenge is now selling Caltex fuel instead of their own stuff. Im pretty sure this is the case but havnt heard it officially

Originally posted by ricodemus
why does a 5.0 mustang only make 225 hp? Some things just dont make sense...

And why do they call it a 5.0 when it is really a 4.9? (4944 cc) :confused: ;)

I am not an expert on Octanes, but there are different methods on how those numbers are obtained in different countries. In the US it is the (R+M) /2 method and in other countries it is just the one number or something. Sorry i can't find more detailed info. Maybe one of those NZ guys knows what I am referring to??

go for the 113 race octane:D its like $7.50/gal

Originally posted by dejoux


I heard that 2 companies sell 98 and one is pretty good and the other is rubbish...unconfirmed rumour though

Anyone heard that Challenge is now selling Caltex fuel instead of their own stuff. Im pretty sure this is the case but havnt heard it officially


BP and Mobil both sell 98 octane fuel, but its the same stuff. In fact all the fuel sold in NZ by Caltex, Shell, Mobil, BP and Challange is exatly the same. Dont listen to what anyone tells you, it comes from the same refinerys, is delievered in the same tankers, and is stored in the same storage tanks. The only differnce is differnt trucks deliver it to differnt service stations.

Gull however uses a mixture of what ever it can find, but most of it comes from Australia, you know the same fuel that caused Subaru to fit all the WRX's with differnt ECU's and lower boost becasue they were detonating so badly.


Anyone who thinks that BP petrol is better than Shell petrol is a misinformed fool.

However, fuel quality can vary between station to station. Becuase of the long distances its trucked around NZ in UNSEALED trucks the 96 and 98 octane fuels often lose a few octane points due to evaporation of some the fuel additives. Same thing happens when its delivered. Its a fact that in Winter NZ fuels will show a slightly higher average octane rating than in summer.
Also a station with high turn over and small tanks so its always getting freash fuel will have the best quality fuel, while the old country station with water filled tanks and deliverys once a month should be avoided.






There are two differnt ways of rating a fuels tendancy to combust. and many differnt ways of measuring it.

RON is the most common, and MON is the most acurate. (funny that the oil companys use RON and not MON). Ill be damn'd if I can remember what the differnce is, but a quick search should find the answers for you.