93 Octane my car loves
would it be ok to switch over from 87 to 89 everytime i fill up? example: monday-87 reg, its thurs and tank is low.i then fill up with 89. then back to 87 etc etc.
how about for the d17's that have full bolt ons, would they need a little better gasoline for their 'performance' mods?
how about for the d17's that have full bolt ons, would they need a little better gasoline for their 'performance' mods?
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i think the only time u need to upgrade octane is when you touch things that relates to the internals, such as FI (turbo or sc) or internal upgrades (pisons, cam, etc). Bolt-ons doesn't really do much other than to have "better" flow.
However I put nothing but 91 Chevlon(sp?) in my stock civic.
However I put nothing but 91 Chevlon(sp?) in my stock civic.
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there's no need to put in a higher octane than what the minimum required is for your car.
higher octane gas means it is more resistant to detonation, which you need on a car with higher compression. turbo'd cars often use higher octane gas, due to the fact that the turbo increases the heat and with the compression increases the chance of early detonation, especially when you crank up the boost.
higher octane gas means it is more resistant to detonation, which you need on a car with higher compression. turbo'd cars often use higher octane gas, due to the fact that the turbo increases the heat and with the compression increases the chance of early detonation, especially when you crank up the boost.
I'm sorry gearbox, im not cracking on you or anything man. Dude you need nitrous, turbo, swap, something. Because everything you do to your car you say it reduces horsepower. I'm sorry man I just think its funny, that all of your posts about performance say the same thing.
Alright, for me i've always been able to tell a difference when putting 93 in my tank compared to 87. I always use chevron and one time, I went to the a chevron and put in 93 supposedly just a little ways down the road I could immediately tell that they didnt fill the supreme tank w/ 93 they filled it with something less. I could feel it in my performance so I completely ran that tank out, went to a different chevron filled up w/ 93 and felt the performance difference come back. You guys can crack on me or w/e im just saying thats my experience with it.
Alright, for me i've always been able to tell a difference when putting 93 in my tank compared to 87. I always use chevron and one time, I went to the a chevron and put in 93 supposedly just a little ways down the road I could immediately tell that they didnt fill the supreme tank w/ 93 they filled it with something less. I could feel it in my performance so I completely ran that tank out, went to a different chevron filled up w/ 93 and felt the performance difference come back. You guys can crack on me or w/e im just saying thats my experience with it.
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Originally Posted by realitycheck
I always use chevron and one time, I went to the a chevron and put in 93 supposedly just a little ways down the road I could immediately tell that they didnt fill the supreme tank w/ 93 they filled it with something less. I could feel it in my performance so I completely ran that tank out, went to a different chevron filled up w/ 93 and felt the performance difference come back. You guys can crack on me or w/e im just saying thats my experience with it.
Well I pumped in 93 octane, but the people at chevron that fill the big massive underground tanks didnt put 93 in there. Sometimes if they dont have in there truck or w/e they will put in whatever they have.
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Rep Power: 369 I was reading a thread similar to this on some other board last week. Went to pick up my gf and decided to grab me some 87 at Sunoco. Given that I always fill up with 94 for no reason other than to feel like a hip hop superstar and blow money, I thought I would examine the change. Got to the station, and there was a sign taped to each 87 nozzle, saying "Out of 87, please fill up with 94 at the same price". I said "gawd damn, no way I can beat 67 cents a litre for 94". Ha ha, so back to 94 I went. Been running it in my car for almost 2.5 years, no problems but no gains. Again, I'm not using the gas to make my car run faster/longer/cleaner/shinier/better-smelling. I just wanna feel like a big man shelling bucks, and I figure considering I save an average of $300 a month on install costs doing things myself, this is one of those useless treats I can give myself, like that last shot of liquor at the bar when you're already wasted, or an extra fortune cookie at the chinese takeout place. And now back to shopping for parts.....
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Rep Power: 347 I'm not really feeling any performance gains unless I'm running high up in the gears with the VTEC. I drive an auto but I do notice the shifts are smoother. I use it all the time. When I swtich to a lower grade of gas the car doesn't feel the same...
yes 93 wont do anything for the car performance wise
also ive heard that if you live in sea level you must use lower octane and on warmer better lower octane performs better
ive tried using all three types of gas and the lowest one performs betteer and last a little longer
unless ur car says permium unleaded only u dont need to use it
also ive heard that if you live in sea level you must use lower octane and on warmer better lower octane performs better
ive tried using all three types of gas and the lowest one performs betteer and last a little longer
unless ur car says permium unleaded only u dont need to use it
well i use 94 and if i cant get that i get 93. and i can tell a differance. but now i cant use anything less then 93 so it doesnt matter i alwayz used 93 or better from the start.
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Originally Posted by jttegx
would it be ok to switch over from 87 to 89 everytime i fill up? example: monday-87 reg, its thurs and tank is low.i then fill up with 89. then back to 87 etc etc.
and yes, i have worked at a refinery and have a chemical engineering degree.
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Rep Power: 311 I heard that higher octane can cuase more deposits to build up in your cat converter since it has more oils in it. Over time, these deposits will eventually cook your cat converter up. Not sure if this only applies to old school cat converters though..
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Rep Power: 381 This is funny.... So you guys can Feel a difference Eh? with your Perfectly acurate "Butt Dyno"? Right.......
Did you know that Higer octane gas is acutally Harder to burn? As previously stated, the Octane rating is the Ratio of Octane to Heptane in the fuel. of these two parts of the gas, Octane is Very stable, and Very tough to get to burn (Requires High COmpression), Heptane is Unstable, and easy to get to burn..... SO Higher octane gasses actually Hold Less Energy then Lower octane gasses. and because of the Higher Octane content, They also Require Higher Compression to burn.... Meaning if you use High octane gas in an engine with low compression, Less of that fuel will burn = More wasted gas is being expelled through the tail pipe.
SO, Not only are you wasting $ by buing Higher Octane rated gas then you need, But you are also not getting any extra perfromance out of the engine... AND you are quite possibly Poluting more because of the extra unburned gas being pushed through the tail pipe.
Did you know that Higer octane gas is acutally Harder to burn? As previously stated, the Octane rating is the Ratio of Octane to Heptane in the fuel. of these two parts of the gas, Octane is Very stable, and Very tough to get to burn (Requires High COmpression), Heptane is Unstable, and easy to get to burn..... SO Higher octane gasses actually Hold Less Energy then Lower octane gasses. and because of the Higher Octane content, They also Require Higher Compression to burn.... Meaning if you use High octane gas in an engine with low compression, Less of that fuel will burn = More wasted gas is being expelled through the tail pipe.
SO, Not only are you wasting $ by buing Higher Octane rated gas then you need, But you are also not getting any extra perfromance out of the engine... AND you are quite possibly Poluting more because of the extra unburned gas being pushed through the tail pipe.
Last edited by Zzyzx; Jan 4, 2005 at 12:30 PM.
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Originally Posted by Zzyzx
This is funny.... So you guys can Feel a difference Eh? with your Perfectly acurate "Butt Dyno"? Right.......
Did you know that Higer octane gas is acutally Harder to burn? As previously stated, the Octane rating is the Ratio of Octane to Heptane in the fuel. of these two parts of the gas, Octane is Very stable, and Very tough to get to burn (Requires High COmpression), Heptane is Unstable, and easy to get to burn..... SO Higher octane gasses actually Hold Less Energy then Lower octane gasses. and because of the Higher Octane content, They also Require Higher Compression to burn.... Meaning if you use High octane gas in an engine with low compression, Less of that fuel will burn = More wasted gas is being expelled through the tail pipe.
SO, Not only are you wasting $ by buing Higher Octane rated gas then you need, But you are also not getting any extra perfromance out of the engine... AND you are quite possibly Poluting more because of the extra unburned gas being pushed through the tail pipe.
Did you know that Higer octane gas is acutally Harder to burn? As previously stated, the Octane rating is the Ratio of Octane to Heptane in the fuel. of these two parts of the gas, Octane is Very stable, and Very tough to get to burn (Requires High COmpression), Heptane is Unstable, and easy to get to burn..... SO Higher octane gasses actually Hold Less Energy then Lower octane gasses. and because of the Higher Octane content, They also Require Higher Compression to burn.... Meaning if you use High octane gas in an engine with low compression, Less of that fuel will burn = More wasted gas is being expelled through the tail pipe.
SO, Not only are you wasting $ by buing Higher Octane rated gas then you need, But you are also not getting any extra perfromance out of the engine... AND you are quite possibly Poluting more because of the extra unburned gas being pushed through the tail pipe.
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Originally Posted by tbaleno
That link shouldn't convince anyone. Its a gas company trying to tell you you may need to get more expensive gas and trying to rationalize it.
Stop f*cking with me.
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Originally Posted by DaRickSta
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Rep Power: 371 There have been tests done by Motor Trend and other reputable car magazines. Putting higher octane gas in a car meant to be driven on regular gas is a waste of money and can harm power. And... putting lower octane gas in a car that requires higher octane gas is a bad idea as well.
Motortrend actually used an M3 to test this and they used a bunch of other fuel economy cars. They were all dyno tested and the graphs proved their statement.
So.. like most of the guys said.... putting anything higher then 87 octane in our cars is a big waste of money.
Motortrend actually used an M3 to test this and they used a bunch of other fuel economy cars. They were all dyno tested and the graphs proved their statement.
So.. like most of the guys said.... putting anything higher then 87 octane in our cars is a big waste of money.
Last edited by R1Style; Jan 4, 2005 at 02:14 PM.
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Rep Power: 267 here's a better definition of octane rating:
http://auto.howstuffworks.com/question90.htm
an extra point i would like to make: the rating is based on what octane/heptane ratio the fuel _performs_ like. it's not just straight heptane mixed with octane (which would cost refineries a LOT more to make). the various streams in the refinery are known by such names as heavy/light naptha, heavy/light distillate, and about 10 other grades i can't remember the names of. they mix these in varying ratios to make different grades of gas. none of them are _pure_ anything (although refineries do make various pure products, like benzene or propylene, they're not in gasoline, as they're too expensive, or inappropriate, to put in gas). i guess the point i was trying to make is, don't go around telling people gasoline is just hept- and octane, as you will be wrong
/end chemical engineer rant
bottom line: obey the owner's manual. 87 octane is what our compression ratio is designed for, just as other cars (read as: real performance cars) require 91+ for their higher compression.
http://auto.howstuffworks.com/question90.htm
an extra point i would like to make: the rating is based on what octane/heptane ratio the fuel _performs_ like. it's not just straight heptane mixed with octane (which would cost refineries a LOT more to make). the various streams in the refinery are known by such names as heavy/light naptha, heavy/light distillate, and about 10 other grades i can't remember the names of. they mix these in varying ratios to make different grades of gas. none of them are _pure_ anything (although refineries do make various pure products, like benzene or propylene, they're not in gasoline, as they're too expensive, or inappropriate, to put in gas). i guess the point i was trying to make is, don't go around telling people gasoline is just hept- and octane, as you will be wrong
/end chemical engineer rant
bottom line: obey the owner's manual. 87 octane is what our compression ratio is designed for, just as other cars (read as: real performance cars) require 91+ for their higher compression.
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Originally Posted by varmin
an extra point i would like to make: the rating is based on what octane/heptane ratio the fuel _performs_ like. it's not just straight heptane mixed with octane (which would cost refineries a LOT more to make). the various streams in the refinery are known by such names as heavy/light naptha, heavy/light distillate, and about 10 other grades i can't remember the names of. they mix these in varying ratios to make different grades of gas. none of them are _pure_ anything (although refineries do make various pure products, like benzene or propylene, they're not in gasoline, as they're too expensive, or inappropriate, to put in gas). i guess the point i was trying to make is, don't go around telling people gasoline is just hept- and octane, as you will be wrong
/end chemical engineer rant
/end chemical engineer rant
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our engines are designed for 86/87 octane. putting a higher octane in them won't change anything unless you have forced induction. it might actually be worse for the car. i met a guy who is a chemical engineer for exxon today and he just went over all of this with me.
Last edited by BrotatoChip; May 19, 2023 at 06:33 AM.
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