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DOHC - 2.3L Duratec / Mazda L Engines Discussions and Topics specific to the Duratec 4 cylinder engines

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  #1  
Old 12-11-2008
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Octane

'03 2.3 will I get better mileage with 89? 93 a waste of cash?
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Old 12-11-2008
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Run 87. Your motor was designed for it. Anything higher is a waste of money.
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Old 12-11-2008
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+1
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Old 12-11-2008
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Quote:
Originally Posted by My91Ranger View Post
Run 87. Your motor was designed for it. Anything higher is a waste of money.
will the mileage be the same if you use 93
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Old 12-11-2008
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might have adverse affects actually. Every engine responds differently. I could almost guarantee you won't get better mileage that overcomes the extra 20-25cents a gallon you are paying for the 93...
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  #6  
Old 12-11-2008
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the computer is not tuned for it i would not bother
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  #7  
Old 12-12-2008
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I treated myself to 89 octane this week and my mileage stayed the same, but truck cranks longer before it starts now.

Last edited by BlutoBodine; 12-18-2008 at 10:38 AM.
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  #8  
Old 12-12-2008
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Just use regular chevron/texaco gas and you'll see better mileage. Compared to the watered down murphy (walmart) crap, racetrack/raceway or any other cheap gas, you'll see/feel better results with Chevron.
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  #9  
Old 12-18-2008
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QT is on every corner around here so that's what I use - Top Tier rated.

http://www.toptiergas.com/retailers.html
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  #10  
Old 12-18-2008
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If you wanna run higher octanes you need a tune.
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  #11  
Old 12-18-2008
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Unless your engine is tuned for something else, you should be running 87. Putting in anything higher is not of any benefit or gain. You aren't treating yourself. At best it is a waste of money. At worst, you engine will run like crap.
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Old 12-18-2008
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in my truck i ran 87 and got 20.5
i ran 94 and got 17

in my bike i ran 94 and got 40
i ran 89 and got 51.2
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  #13  
Old 12-18-2008
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Quote:
Originally Posted by FireRanger View Post
Unless your engine is tuned for something else, you should be running 87. Putting in anything higher is not of any benefit or gain. You aren't treating yourself. At best it is a waste of money. At worst, you engine will run like crap.
Hence ... "but truck cranks longer before it starts now" so I went back to 87 and truck seems happier now. Saved enough to pay for a stripped down QT hotdog.
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  #14  
Old 12-18-2008
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tane

Ill go ahad and stick with 87, truck runs fine on it, i just wondered about better mileage.
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Old 12-18-2008
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I never noticed anything, stayed the same for me
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Old 12-18-2008
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Since your truck is N/A, Your compression ratio isnt high enough to see an advantage (performance/mileage) to be worth using that gas.

Believe what you want, but I get paid to tune.

Your best chance would be setting the target closeloop AFR to 1.03 lambda, instead of a stock 1.00 - any leaner than this will cause a motor that old to run hot, and it will start pulling more fuel to counteract this (hence killing any gains you made)

You will need better fuel control to do this than the stock OEMECU. AEM w/ Wideband support FTW.

I doubt you will spend the 2500$ or so on this equipment so best bet is run 87 and keep your foot out of it.
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  #17  
Old 12-19-2008
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This is something I've experimented with quite a bit. In summary.. if your tune is stock you won't gain anything from the octane alone. The fuel might have more energy in it causing the load to go down. And from that you'll gain a little. But if it's just cheap gas at a higher octane you won't gain a lick.

Now if your tune/timing is adjusted for the appropriate rpms vs load. Then yes you will increase MPG. Since I can tune my own, this is what I've done.

Even though I run shell 93 or sunoco 93/94 costing $0.20 more per gallon. It's cheaper overall because of the increase. Another thing I greatly benfiet from is low end power. I've got lots more timing down low too..
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  #18  
Old 12-19-2008
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I noticed a few extra miles per gallon but wasn't worth the extra money it cost for it. So I am back to 87 again.
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