Is your truck tuned for 89? Its a waste if its not. Just run 87 just like the owners manual calls for unless you get a tuner and have different tunes for the different octanes.

 

yeah no its stock ill look at what the book says for my truck

 

Its a Ranger. Regular 87.

 

haha yup

 

well i hear ya on that, but I think my motor is showing age. pretty much any 87 I put in, the spark knock is so bad that I hate to drive my truck...literally. I do have a 3.0 though...so 89 and sometimes 93.

i have also heard that higher octane gas actually leaves behind more carbon

 

becuase it doesnt burn properly if your engine is not tuned for it...

I dont understand why so many people think running higher octane is better? the first few posters make me laugh, especially about being weary of going back to 87...

 

Me neither lol. I'm surprised they aren't running around with intake Tornados and throttle body spacers too lol

 

You forgot the fuel magnets.

 

Run a couple ounces of Lucas Oil Products' fuel treatment every other tank for a month. It'll work wonders for ya.... very good product.
Lucas Fuel Treatment : Lucas Oil

 

Did I read right about 87 octane not having ethanol?

 

your gas station should say on the pump if it contains ethanol or not.

 

while on the subject of gas Im gonna have to disagree with saying running 92 oct (thats what we have here in WA) is not pointless. There was HUGE difference if running 92 in my crx compared to 87. gas milage did go up and feels like a couple more ponies. But as well there is no reason to run 92 in the ranger when it does just fine on 76's 87.

 

your CRX proably had much higher compression then the Ranger does. If I remember correctly, my old 89 Prelude had 10-1 compression. I doubt the Ranger has anything over 8.5-1 compression.

Im sure the boost the original poster felt is the self induced butt dyno error factor.

 

every once in a while i throw 93 in the ranger for ****s and giggles. seems like a little but dyno improvement, but eh idk. its only a couple of dollars.
the timing on my mustang is advanced so much, i have to run 93 or it pings/knocks like mad.

 

I have told this story many times. Sport Compact Car Magazine did a test back in 2000 or 2001. The got a bone stock V6 Accord and ran it on the dyno several times with the recomended 87 octane fuel. Then they ran it on 91. Each run made on 91 show a loss of about 10hp. Yes air temp, oil temp, water temp blah blah was taken into account. They aren't noobs. If your vehicle doesn't call for it then don't waste your money.

 

makes all the difference.

 

Yes stock compression on a b18c1 is 10.0:1 compression but the only reason i would really have to say I run 92 OCT in it is because of that extra resistance to detionation when at or above 8.5k and higer in the rpms. But like I said in a ranger there is no reason to run that high of a octane.