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Author
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Topic: Octane?
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greengoblin
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Member # 1720
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posted
 
 
Does anyone here feel any difference in accelleration or smoothness between 87 octane to 91 octane?
Especially for those people who've used these two octanes on a daily basis?
Both 5.0 and 4.6
Just wondering how others feel about it.
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2002 stang GT
1991 stang LX (sold)
Posts: 45 | From: alameda | Registered: Aug 2002
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TRIXSNK
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Member # 2844
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posted
Generally most stock vehicle will be designed to run perfectly fine on 87 unless specifically stated by the manufacturer.
Now if you have adjusted the timing (advanced) to get more power then 91 should almost always be used for saftey as to not allow the motor to reach the threshold of detonation.
Also if anypower adders are used 91 would have to be the min. especially with our gas in Cali.
Hope that helps ![[patriot]](graemlins/patriot.gif)
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9 Sec EVO 9 is GONE!
New project in the works.......
Posts: 3740 | From: Bay Area | Registered: May 2003
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wilit
Mustang Messiah
Member # 3367
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posted
Search. There are at least 40 threads asking this exact question.
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"If a man hasn't found something worth dying for, he isn't fit to live." - Martin Luther King Jr.
Posts: 4793 | From: 37.78514° North 122.40100° West | Registered: Oct 2003
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greengoblin
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Member # 1720
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posted
ah yes, I understand timing.
I just wanted to know if anyone out there feels any difference when driving daily on 87, but changed to 91 because they felt a big difference.
And yes i've been on here long enough to know how to search.
I'm assuming theres no one here that feels any difference.
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2002 stang GT
1991 stang LX (sold)
Posts: 45 | From: alameda | Registered: Aug 2002
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TRIXSNK
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Member # 2844
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posted
In my wallet....YES
In the seat of my pants...NO
![[Razz]](tongue.gif)
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9 Sec EVO 9 is GONE!
New project in the works.......
Posts: 3740 | From: Bay Area | Registered: May 2003
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greengoblin
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Member # 1720
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posted
quote:
Originally posted by wilit:
http://auto.howstuffworks.com/question90.htm
Listen carefully,
I don't need statistics or how stuff works.
the Key word here is, "feel".
I don't need you're smart ass post.
IF you want to tell me about the feeling, good.
if you want to be an internet fact man, shut the fuck up.
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2002 stang GT
1991 stang LX (sold)
Posts: 45 | From: alameda | Registered: Aug 2002
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BlackNGold
CaliforniaFords.com
Moderator
Member # 655
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posted
quote:
Originally posted by greengoblin:
quote:
Originally posted by wilit:
http://auto.howstuffworks.com/question90.htm
Listen carefully,
I don't need statistics or how stuff works.
the Key word here is, "feel".
I don't need you're smart ass post.
IF you want to tell me about the feeling, good.
if you want to be an internet fact man, shut the fuck up.
wilit is a long time contributing member, he could have been having a bad day, but please keep personal attacks to PM's, and not clutter up tech talk with personal attacks, lets keep it tech only...
To maybe better answer your question, the difference in "seat of the pants feel" is too hard to measure between 87 and 91 octane...If you're running 10* timming and 87, then bump up the timming to 14* and run 91 you can add some ponies, but then that all depends on the engine mods, milege on the motor and even the weather...
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-SLOWER TRAFFIC KEEP RIGHT-
Posts: 5132 | From: Bay Area, CA | Registered: Dec 2001
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wilit
Mustang Messiah
Member # 3367
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posted
Sorry man. I figured since you were asking such a newbie-esque question, I'd provide you with some knowledge on octane ratings. How am I supposed to know how much automotive knowledge you posses? And running 87 and 91 in a stock car won't make a damn bit of difference, but in a highly modified car, yeah, it'll make a huge SOTP difference. But how the hell am I supposed to know what kind of mods you have on YOUR car? The SOTP feel for my car may be different than the SOTP feel for your car. So your question doesn't provide enough information to provide you with an accurate answer.
[ August 12, 2004, 10:48 PM: Message edited by: wilit ]
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"If a man hasn't found something worth dying for, he isn't fit to live." - Martin Luther King Jr.
Posts: 4793 | From: 37.78514° North 122.40100° West | Registered: Oct 2003
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FasterDamnit
Bad Attitude
Member # 442
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posted
87 will make more power than 91 at street compression ratios. Higher octane burns slower, so how does that fit into your faster sotp feel theory?
[ August 12, 2004, 10:52 PM: Message edited by: FasterDamnit ]
Posts: 2971 | From: NorCal | Registered: Sep 2001
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Blind
2.3L
CAFords OG
Member # 3052
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posted
quote:
Originally posted by wilit:
Sorry man. I figured since you were asking such a newbie-esque question, I'd provide you with some knowledge on octane ratings. How am I supposed to know how much automotive knowledge you posses? And running 87 and 91 in a stock car won't make a damn bit of difference, but in a highly modified car, yeah, it'll make a huge SOTP difference. But how the hell am I supposed to know what kind of mods you have on YOUR car? The SOTP feel for my car may be different than the SOTP feel for your car. So your question doesn't provide enough information to provide you with an accurate answer.
that answer was way too thorough for the response he gave you before
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89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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Blind
2.3L
CAFords OG
Member # 3052
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posted
`
[ August 12, 2004, 10:54 PM: Message edited by: blind ]
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89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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greengoblin
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Member # 1720
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posted
No, I should be the one apologizing.
It's been a crappy day for me too.
And yea, haha I would thought it was a total newb question too.
Reason why I asked is a couple buddies of mine have been saying the octane difference is Very noticeable.
Sorry everyone
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2002 stang GT
1991 stang LX (sold)
Posts: 45 | From: alameda | Registered: Aug 2002
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