Mazda3 S performance with high octane gas

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solort

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2004 Mazda3 S 4dr 5sp Solar Yellow
I was wondering if running 93 Octane gas in a 2.3L Mazda3 S will give it more accelleration than 87 Octane by allowing the timing to advance? Anyone tried this on a dyno? And can you pull a fuse to reset the computer to adjust timing to the current fuel octane (Like I can with Dodge Neon DOHC)? Thanks
 
solort said:
I was wondering if running 93 Octane gas in a 2.3L Mazda3 S will give it more accelleration than 87 Octane by allowing the timing to advance? Anyone tried this on a dyno? And can you pull a fuse to reset the computer to adjust timing to the current fuel octane (Like I can with Dodge Neon DOHC)? Thanks
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As I understand, higher-octane gas doesn't provide performance, but is required on higher-performance (higher-compression) engines to avoid detonation. Google "detonation".
 
If the DOHC Neon is designed to run 93 oct gas it will benefit. I assume at most the Neon was designed to run on 91 oct, so running 93 only benefits Exxon's profit margins. Since the 2.3 Mazda is designed to run on 87, running it on anything higher just wastes your money.
 
Raymo853 said:
If the DOHC Neon is designed to run 93 oct gas it will benefit. I assume at most the Neon was designed to run on 91 oct, so running 93 only benefits Exxon's profit margins. Since the 2.3 Mazda is designed to run on 87, running it on anything higher just wastes your money.
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+1
 
I tried running a tank of 93 on mine once and it did nothing but smooth out how the engine ran... so it's a waste of money compared to my protege which did benefit from high octane
 
if you want to benefit from high octane goto m**************** and look for the MOnzta or Advance timing mod where you move the crank position sensor to change the ignition timing to benefit higher octane about 89 is good for 6hp not much diff between 89 and 93 gains
 
Spdmnadam said:
if you want to benefit from high octane goto m**************** and look for the MOnzta or Advance timing mod where you move the crank position sensor to change the ignition timing to benefit higher octane about 89 is good for 6hp not much diff between 89 and 93 gains
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OWNED! by the "we-dont-let-you-post-other-forums" rule
 
i usually put in 89 or 91, after reading this i filled up with 87....it doesn't run as well. Right after i put it in it started making weird noises, those have gone away, but i still feel a SLIGHT acceleration decrease.
 
I suspect one thing that may be leading folks to believe paying for premium gas when not needed is getting a bad tank of regular. Now of course the distributers, refineries and dealers may be doing that on purpose. I do not think there is a state in the US that checks the octane ratings. They usually just check that the pumps put out gallon for charging you a gallon.
 
if you car says to put a certain octane of gas then you use that octane of gas. now if you start advancing/retarding than you have to change the octane accordingly. especially if you slap on a turbo. now what might've happened in dereks case is that the car is used to the higher octane and needs to re-adjust to the lower octane. im not a specialist, just an educated guesser and i think that dereks car retarded its timing and now needs to advance it because of the octane change
 
ok while we are talking about octane...does the octane boost bottles work? i did the monstaz timing mod a week ago and thought about higher octane but never did it.
 
derek-im just guessing so dont take my word for it lol

mazda32008-i wouldnt really trust those octane boosters. I know some companies boosters actually EAT the oxygen sensor causing problems, others only give you like +2 rating over whatever octane you put it. The stuff racers use is probably undiluted which gives them a better use. I think i've heard of some people who've used acetolyne(sp?) and get pretty good use out of those because it helps the gas "mist" better. SOMEONE CORRECT ME IF IM WRONG,PLEASE!
 
Personally i run 89 octane, its a step in the the middle where im not spending too much to try and keep my engine clean. After about a month or so i buy the lucas oil tune-up. its pretty freakin awesome. I really can tell the difference when its in there and when its not
 
thanks, i'm going to try that out for a few months and see how i like it.

haha i'm at work right now and your sig made me laugh, i probably look funny....laughing at the computer screen.
 
octabne boosters suuuuuuuck. they say you can gain like 10 points per bottle but they dont tell you each point is equal to like....1 octane point....lol. so to the 93 octane. putting higher octane will kill any spark knocks your motor would put out on 87. 93 will increase gas milage by a little bit because it burns slower and cleaner than 87. lastly in burning cleaner your not leaving so much gunk in your motor. i have a speed and it requires 93 because like stated above...the high compression. it take so much compression to detonate the gas. each gas takes a different amount of compression to detonate it. higher compression, higher octane. but if your motor doesnt need the high octane...the fumes will burn more complete than the lower octane fuel. There are also improved timing maps that can be used with higher octane fuels. Higher octane allows more aggressive ignition timing and allows more margin for a hot lean A/F mixture without detonation so you can gain more power. but only by maybe 3 hp that wouldnt even be amounted to s*** at the wheels.

plus, at the difference from 3 a gallon to 330 a gallon....imo...not worth it with gas prices the way they are.
 
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