hi all just wondering what octane you U.S boys are using in your cars. over here (aussie) we have 93 , 95, and shell and bp do 98 i use 98 bcoz as far as i know jap 7s are designed to run on 100. what are U.S 7s designed to run standard?

 

i believe the manual says 87 .... for n/a you should use 87, for T2's i think theres a debate between using 87 or 91 for stock T2's, but modded T2s should use the highest octane possible.

I use 87 for the n/a and 91 for the T2

 

Different countries have some variation in what RON (Research Octane Number) is standard for gasoline, or petrol. In the UK, ordinary regular unleaded petrol is 91 RON (not commonly available), premium unleaded petrol is always 95 RON, and super unleaded is usually 97-98 RON. In the US, octane ratings in fuels can vary between 86-87 AKI (91-92 RON) for regular, through 89-90 (94-95) for mid-grade (European Premium), up to 90-94 (RON 95-99) for premium unleaded or E10 (Super in Europe)

When I purchased my '89 TII new in May '89, I used 87 which was the recommended rating. I continued to use 87 until slight modifications were done when the new engine was installed in 2001. At that time, and since I've used 93.

 

thanks thats interesting when i lived in the uk they had 95 and 98 same here in australia and japan ive been told most manufacturers for jdm sports cars are designed to use 100 does the U.S have an equivalent to jap 100 ron?

 

Wtf ^^ There Should Have Been A Gap Between Your Quote And My Writing

 

I use 93 octane in all my rides...

 

AREN'T YOU SUPPOSE TO RUN AT LEAST 92 OCTANE ON A TURBO?
I USE 93 ON MINE

 

93 all the way

 

If you can get 94 octane (There's one station around here that has it and it's about $0.25 more than 93), that's approximately 99 RON.

I use 89 on my N/A because I'm used to it. I use 93 on my scooter because it's so cheap. I'm basically a marketing ***** that believes Shell puts something useful in the higher octane gas.

 

I just edited so that there now is...

You must have accidentially erased the "te]" from the [quote]


And I used 87 in all my non turbo motors (better burn quicker when compressed) and 91 in my Turbos.

 

87 in the NA sport and 91 in the TII

 

as low as I can get it.

 

91 octane, I happened to find 92 here. I wish we had 93. i also use octane boosters when i have the money.

 

93 octane in a modded 1991 NA any less and it runs like **** and doesnt get as good of gas mileage

 

Ultimately, you want to run the lowest octane fuel you can get away with. Some later model cars have ECUs that are smart enough to advance the timing to a point just before detonation, when higher octane is introduced. Unfortunately, our ECUs arent really that smart. 87 for anything stock, and once you start modding, increase your octane as needed to keep up with your modifications. This applies more for the TIIs then the N/As

 

87 due to the high gas prices.

 

I've always recommended running low octane (87 in most areas) in the NA according to the manual, but one step up in the TIIs. Might have to go higher in the TII if you start modding.

 

Been using 87 for like 7 years now.
I don't have a massive turbo or anything crazy.

Any specific mods when to start increasing octane?
-Turbo Upgrade
-FMIC
-Boost Increase
-Etc.

 

87

 

i run 91-93 depends on what the store has you know. but full s5 swap and got a free turbo from work so time to do some modifying and premix (so im not sure maybe try out 2 gallons of nitromethane, and 4 ounces of 2 cycle with premium.) ill let you guys know how it goes