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Posted 23 February 2004 - 12:15 PM
I was just reading the owners manual for my recently purchased '87 GL Turbo wagon.
It says to use 90 octane.
I've been using 87 octane for a month now and it seems to be running fine, no knocking, hesitation etc, and I'm averaging 25 to 26 mpg.
Should I go to the 90 octane or not?
Posted 23 February 2004 - 12:25 PM
Posted 23 February 2004 - 12:30 PM
Posted 23 February 2004 - 02:02 PM
Posted 26 February 2004 - 07:50 PM
Here in the USA, we rate gasoline by (R+M)/2 which is the average of the figures achieved by the Research and Motor Methods. The Research Method usually results in a higher number than the Motor Method, so the 90 octane recommended in our owner's manuals actually equates roughly to our 87 octane gas.
Posted 26 February 2004 - 08:48 PM
Honestly, I didn't know that the research method trended higher - I just assumed they were closely related and the averaging was to correct for anomalies in the testing processes, kind of like the Bowl Championship Series computer average (oh wait, that doesn't work worth a dang!).
Posted 26 February 2004 - 09:54 PM
Posted 27 February 2004 - 02:36 AM
Posted 27 February 2004 - 06:25 PM
I have never been able to run any of my subarus on 87 octane without them pinging.
I usually run 89 but will tank up on 92 for long freeway runs or hot days.
That's been my experience......
Posted 27 February 2004 - 07:52 PM
Non turbos, thats fine to run whatever...but id still run 93, cuz i mod it!
Posted 27 February 2004 - 08:39 PM
RussHill, if yours is pinging, try seafoam or top engine cleaner, that should get rid of some of the carbon in the cylinders and intake and return the inside of your motor to more 87 friendly territory.
Posted 27 February 2004 - 09:23 PM
i have a fresh tune up in there including 8mm wires. i'm tempted to buy an accel coil tomorrow but i shouldn't. shoulder angel says no, be good; shoulder devil reminds me that my income tax return deposited to checking today. damn that devil!
Posted 27 February 2004 - 09:40 PM
Posted 27 February 2004 - 09:40 PM
Some brands of gas had a huge difference between research and motor octane, even though they all averaged out about the same.
I was riding my Yamaha SR500, 1/2 liter single cylinder motor bike, which was really octane sensitive. It liked premium, but I could run it on regular if it had high motor octane numbers.
So, the bottom line is the (R+M)/2 number doesn't necessarily tell you what you really want to know about the fuel. Experimental results may be more valid than the number on the pump.
Posted 28 February 2004 - 01:07 PM
87oct every time if I boost over 4 psi it pings, det, loss of power. but not boosting it does ok. but that one time you really want to go you are screwed, ping ping ping, pi, pi PING!!
91oct for the most part pretty good for me, before I was having some injector problems and it would ping on this too. got new injectors now everything a ok.
never really tried the one in the middle. My manual doesn't give any specs on recommended oct rating. Its an 86.
Posted 28 February 2004 - 08:19 PM
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