91 octane + 4.0L = Kitty Love .prrrrr - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 04-25-2012
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91 octane + 4.0L = Kitty Love .prrrrr

Just had to put a bit of good stuff in her. Everything is just so much better. Smoother shifts, less noise, and obvi moaaar POWER! Agree? Only thing; here in Ontario it's $1.45 / L ..
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Old 04-25-2012
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Unless your motor is tuned for 91 you are doing more bad then good.
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Old 04-26-2012
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Unless your motor is tuned for 91 you are doing more bad then good.
I agree. Wasting money.
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Old 04-27-2012
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My baby likes the cheap stuff.
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Old 04-27-2012
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Holy crap, that comes out to 5.51 a gallon!
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Old 04-27-2012
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funny n00b wasting money on premium...
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Old 04-27-2012
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funny n00b wasting money on premium...
x2 lmao
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Old 04-27-2012
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haah noob on premium.. thats my new signature. anyway, i just travelled from british columbia to ontario; i did the math WHILE i had premium in the tank and REGULAR in the tank. please tell me you think that the milage is the same (kilometers in my case) between the petros.
So could someone tell me why i shouldnt use 'premium' rather than calling me out on wasting? (just saying tuning doesnt cut it)
also, regular 87 is 1.30L.
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Old 04-27-2012
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your truck comes factory tuned to run 87, meaning it is designed to run the most efficient way it can on that octane of fuel. putting anything else in it is useless.

same goes with that octane booster in a bottle, its crap without a tune
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Old 04-28-2012
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Here, read this.

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The octane rating of gasoline tells you how much the fuel can be compressed before it spontaneously ignites. When gas ignites by compression rather than because of the spark from the spark plug, it causes knocking in the engine. Knocking can damage an engine, so it is not something you want to have happening. Lower-octane gas (like "regular" 87-octane gasoline) can handle the least amount of compression before igniting.

The compression ratio of your engine determines the octane rating of the gas you must use in the car. One way to increase the horsepower of an engine of a given displacement is to increase its compression ratio. So a "high-performance engine" has a higher compression ratio and requires higher-octane fuel. The advantage of a high compression ratio is that it gives your engine a higher horsepower rating for a given engine weight -- that is what makes the engine "high performance." The disadvantage is that the gasoline for your engine costs more.
The use of a higher octane fuel than required, is a twofold mistake. You are wasting money and can possibly do damage to the engine. Using a higher than require octane rated fuel will not increase performance, clean the engine, or offer any benefits whatsoever. If your engine was designed for 87 octane, then use only 87 octane. If it requires 91 octane, then by all means use 91 octane. The engineers who designed the engine know full well what octane fuel it needs. The octane rating of gasoline determines how much the fuel can be compressed before it spontaneously ignites. That is all it does! (Look in your vehicle's owner's manual for information about the octane requirements of your vehicle).

Now, some people believe that using higher octane fuel will clean out your engine. However, higher-octane fuel contains no more detergent than low-octane fuel. If you feel you need some extra cleaning, there are additives that you can get at the local auto shop, but do not use them too much or it will damage your fuel injectors.
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Old 04-28-2012
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^right...my ranger calls for 87 so i run 87...now my tbird that runs 11:1 compression i need at least 93 octane...but that car calls for a minumum of 93 octane...just run what the owners manual tells you
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Old 04-29-2012
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I run 91 in mine...but thats because I have a 91 performance tune.
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Old 04-30-2012
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Originally Posted by wyldechild View Post
I run 91 in mine...but thats because I have a 91 performance tune.
What is a 91 octane tune? If you haven't increased the compression ratio all you've done is move the timing curve. You're still wasting money with 91 octane. The only way to raise compression is high comp pistons, deck the block, shave the head, or forced induction.
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Old 04-30-2012
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What is a 91 octane tune? If you haven't increased the compression ratio all you've done is move the timing curve. You're still wasting money with 91 octane. The only way to raise compression is high comp pistons, deck the block, shave the head, or forced induction.
you can make gains adjustingbtiming and trimming fuel - not as drastic as increasing compression.

If you want even better knock suppression switch to alcohol, this is what I use.
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Old 04-30-2012
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Cool, I like to learn. Stp red once and a while it is...thanks 98liftedranger
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Old 04-30-2012
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Quote:
Originally Posted by Jp7 View Post
you can make gains adjustingbtiming and trimming fuel - not as drastic as increasing compression.

If you want even better knock suppression switch to alcohol, this is what I use.
I use alcohol too

wait... are we talking about our trucks?
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