What gas do you put in your 4g?

Just curious as to what type of gas you put in your 4g? Regular, "Medium" or "Super"

87 octane here.

My EX runs fine on regular.

89 mostly all of the time on the civic and 91 on the accord:eek: :D

94.

Originally posted by FourthGenHatch
94.

Damn, I wish our pumps had 94. Utah only goes as to 91 octane.

But, we did find a pump with 100 octane. :eek:

I only buy premium and I only buy from Chevron. Only the best for my car.

93 in my baby... I usually buy it from RaceTrack or Hess. If she is real nice to me, sometimes she gets the "blue stuff" from the drag strip ( Only like half a tank, cuz that shit aint cheap!). :D

Originally posted by kris
87 octane here.

ditto. why pay more when i dont have to.

i run 91/92 octane.. depending on where i go. i belive amoco has 92 and everyplace else is 91 octane.. premium only because i have my timing adavnced a little.

87 octane.

VP race fuel 114octane on fri-sat and wed...the rest of the week just run 103 trick fuel

yah its pricey..but when your boosting and spraying.....i would rather pay a bit more and not worry as much and go a lil faster than put 87..and do some damage to a motor i spent so much time on

i used to run 87 regular on the crx, but once the swap is done, ill be running 93 or up only.

98 Octane (Mobil Synergy/Shell Optimax/BP Ultimate)

96 if I'm desperate - the B16A really runs smoother and revs cleaner on 98 though.

Originally posted by Dark Syde Racer
VP race fuel 114octane on fri-sat and wed...the rest of the week just run 103 trick fuel

yah its pricey..but when your boosting and spraying.....i would rather pay a bit more and not worry as much and go a lil faster than put 87..and do some damage to a motor i spent so much time on

It's always better to be safe than sorry.

87 or 89....whichever is regular at the gas station im at.....on an interesting note my parents were listening to NPR the other day and three representatives from car manufacturers and gas companies were talking about the differences between the gas, and they all said that 87 was all that you need....now there was no honda representative but a guy from GM said that the only suggest using 92 on the corvettes, but there is no real need for it.....they were also talking about unmodded cars so turbo, nitrous, and high comp engines obviously all have different requirements than stock engines

Yea, one of my science teachers back in the day was talking about how theres little to no difference. Also, ive heard that gas stations sometimes put water in with their gas so that theres more and they make more money. Its kinda believable. Still, whenever the premium prices dip down a bit Ill fill it up with that cuz I know now that it actually is better for the engine.

I can't believe you guys are talking sub-90 octane. Sheesh, we only get 93, 96 and 98. We get a fair few jap-spec cars though - so I guess that has something to do with it... the market was sick of having them detuned to suit the fuel we had in the 80s.

I saw an owner's manual for a 97 del Sol which recommended 86 octane.
I know my Honda was designed to get by on far less, but I go for the 91 octane. That is the highest octane available around any part of New Mexico.
When I travel to central Texas, I treat my car to 93. That's what premium is there.
It's not for longevity; I can tell a serious difference trying to climb one big hill on I-25 (it's called La Bajada) if I've got the cheap stuff.
I only go for the 86 octane fuel when my wallet is sorely depleted. That's what's in there right now.
Flunky

93 Octane. 10.2:1 Compression owns me :p

Originally posted by Setanta
I can't believe you guys are talking sub-90 octane. Sheesh, we only get 93, 96 and 98. We get a fair few jap-spec cars though - so I guess that has something to do with it... the market was sick of having them detuned to suit the fuel we had in the 80s.

Same...we only have 91, 96 and 98! :D

93 octane from amoco/bp

Wow. The Premium gasoline in New Mexico is the shit-gas in New Zealand.
Flunky
PS-The city of Los Angeles has ordered the first run of hydrogen fuel cell-powered cars from Honda. Of course, they are civics.
Anybody ready to hop up one of those?

I think that the octane numbers are different between the ponds..What is the formula to figure octane in NZ & Aus?? In the US they use R+M/2

So like the R number is 96 and the M (i don't really know what these mean or what the R & M stands for) is like 85 so it is 96+85/2 = 90.5 which of course the oil companies round up to 91 ;)

I think that some countries only use the ROM number labeled as their "octane number".
I read all this in Car & Driver or something once...I need to find it again and get up to speed on what that stuff means :bloated:

I use 93 in my car, cuz whatever they put in that gas that isn't in 87 keeps my valves from pinging. Occasionally I'll treat her to 94, available at Sunoco, but it is a little pricey. Sunoco used to mix their 86 & 93.5 octanes right at the pump when you selected 87, 89, or 91 octane - did u ever notice they had two hoses?? One was 86 and one was 93 and if picked something in the middle it adjusted the ratio that came out of each one to get the octane u picked...I think that way they only needed two tanks underground and not 5 to accomodate the 5 'choices' of fuel they offered. ;)

Edit: here is an excerpt I found on the web:
How is octane rating determined?
Gasoline is subjected to two testing methods to establish its octane rating: one, called the motor method, runs the gasoline in an engine under load; and a second, the research method, runs the gasoline in a free running engine. The research method gives slightly higher ratings, and the octane number displayed on the pumps is an average of the two methods.

Edit again: More than you ever wanted to know about octane ;)
http://www.seansa4page.com/resource/octane.html

i just use 91, thats usually the highest at petro where i go

i live in canada and they think i'm slow eh

I always use the highest they got, I think premium down here in Florida is 93.

i use uncle ben's

94 I was told thats what should be used in a b16a1

my Si hatch gets 89 octane. and my crx always got 87 besides for the time i put premium in by acident.

i use 87/88, or the lowest they got on my d16y8 CRX. lol am i actually losing power doing this? Is it really bad for my car? Should i start using the 91-93 octane?

87 octane...I'm a poor High School Junior, I don't have enough money to spend on anything higher really.

lol same situation with me, but i'm a senior :P Too much money towards my mods, cheap on gas.

Shit i just flat out don't have money, for mods or gas, lol.

Im a high school senior who just turned 18 and pays my own insurance, parts, gas and everything. Im running 89 octane for now, but after a few more tanks ill step her up to 91. I was living paycheck to paycheck, but now I dont have a job! Car shit is expensive, and it takes forever to start a new job... Runnin low on cash...

89 for my car... it dose nothing to put 93 in it ...(well maybe make me pay more)

95 everyday (lowest we get) and i have used to BP ultimate 100 a few times but its a bit expensive :(

95 everyday (lowest we get) and i have used to BP ultimate 100 a few times but its a bit expensive :(

Yeah..but your octane #'s mean different things over there compared to ours. I think yours is just the RON number whereas the US octane is the (RON+MON)/2 method, which generally produces a lower general octane number, cuz the MON# is lower. I'll try to find the data I read which compares your #'s to equivelant US octane numbers.

Here is some data :thumbsup: - kinda long...you can choose to read it or not: it came from here: http://www.truckpulls.com/fuel_octane_faq.htm

6.5 What does the Motor Octane rating measure?
The conditions of the Motor method represent severe, sustained high speed, high load driving. For most hydrocarbon fuels, including those with either lead or oxygenates, the motor octane number (MON) will be lower than the research octane number (RON).


Test Engine conditions Motor Octane
Test Method ASTM D2700-92 [104]
Engine Cooperative Fuels Research ( CFR )
Engine RPM 900 RPM
Intake air temperature 38 C
Intake air humidity 3.56 - 7.12 g H2O / kg dry air
Intake mixture temperature 149 C
Coolant temperature 100 C
Oil Temperature 57 C
Ignition Advance - variable Varies with compression ratio
( eg 14 - 26 degrees BTDC )
Carburettor Venturi 14.3 mm

6.6 What does the Research Octane rating measure?
The Research method settings represent typical mild driving, without consistent heavy loads on the engine.


Test Engine conditions Research Octane
Test Method ASTM D2699-92 [105]
Engine Cooperative Fuels Research ( CFR )
Engine RPM 600 RPM
Intake air temperature Varies with barometric pressure
( eg 88kPa = 19.4C, 101.6kPa = 52.2C )

Intake air humidity 3.56 - 7.12 g H2O / kg dry air
Intake mixture temperature Not specified
Coolant temperature 100 C
Oil Temperature 57 C
Ignition Advance - fixed 13 degrees BTDC
Carburettor Venturi Set according to engine altitude
( eg 0-500m=14.3mm, 500-1000m=15.1mm )

6.7 Why is the difference called "sensitivity"?
RON - MON = Sensitivity. Because the two test methods use different test conditions, especially the intake mixture temperatures and engine speeds, then a fuel that is sensitive to changes in operating conditions will have a larger difference between the two rating methods. Modern fuels typically have sensitivities around 10. The US 87 (RON+MON)/2 unleaded gasoline is recommended to have a 82+ MON, thus preventing very high sensitivity fuels [39]. Recent changes in European gasolines has caused concern, as high sensitivity unleaded fuels have been found that fail to meet the 85 MON requirement of the EN228 European gasoline specification [106].

6.8 What sort of engine is used to rate fuels?
Automotive octane ratings are determined in a special single-cylinder engine with a variable compression ratio ( CR 4:1 to 18:1 ) known as a Cooperative Fuels Research ( CFR ) engine. The cylinder bore is 82.5mm, the stroke is 114.3mm, giving a displacement of 612 cm3. The piston has four compression rings, and one oil control ring. The intake valve is shrouded. The head and cylinder are one piece, and can be moved up and down to obtain the desired compression ratio. The engines have a special four-bowl carburettor that can adjust individual bowl air-fuel ratios. This facilitates rapid switching between reference fuels and samples. A magnetorestrictive detonation sensor in the combustion chamber measures the rapid changes in combustion chamber pressure caused by knock, and the amplified signal is measured on a "knockmeter" with a 0-100 scale [104,105]. A complete Octane Rating engine system costs about $200,000 with all the services installed. Only one company manufactures these engines, the Waukesha Engine Division of Dresser Industries, Waukesha. WI 53186.

ah right i didnt realise that we used different methods of octane lol good write up though :)

lol :) i use 87. Just got outta high school and can't spend much money on gas. I'm spending more on repairs and body work nowadays so i don't really have much extra to use. 87 gets me where i wanna go, cheaper (sometimes anyway). But maybe when i'm done with the major work i'll step up to 89.

I still hate gas. The cheapest place is $1.93 and that is at one place...everywhere else is $2.00-$2.10 for the cheap shit. Just a month ago the cheapest for 87 was like $2.17 though, so I guess its slowly going down.

gas out here is 2.20 starting at the cheapest.... it was up to 2.30 a few weeks ago... You won't find it for under 2.10 i can promise you

omg lets all just get a buncha solar panels and put a custom made bicycle pedal chain thingy on all 4 seats to generate electricity - make your passengers work for you...pedal pedal pedal mr hampster

:rofl: ^^ thats funny

91 Octane...with water in the gas! lol, crappy gas

Premium, always, which usually means 93. Sure it's more expensive, but the extra mileage justifies the cost, and it burns much cleaner.

89 here for my rusty winter rex....i was planning on goin 91 or 92 for my new rex with B16.....but prices are going higher and higher so idk...

is it bad to change from one to another?

need 2 change my vote from regular (back when i had the d15b2) to Supreme 94 octane with octane booster :)

i've tried premium and regular. i get absolutely no boost in power or in gas milage from it with my engine. what i've read leads me to believe that i'd need an engine that was anal about the timing for it to give me any benefit. something high performance.

i run the cheapest shit i can find. gas is so outrageously expensive it makes me sick.

recently went up to 94.9 from 91.9....

and im in canada, so the price is per liter obviously.

i usually let my tank go down to maybe a quarter at the very lowest and then top it right up. then it went up to 91.9 so i started putting in like 10 bucks each time hoping it would go down. well, i have officially received a gas price shit kicking.

there goes cruising for fun.

fyi im also in highschool, graduating in a few months.


and just another thing, whats with the price having a decimal in it, when its already a fraction of a dollar? $0.94.9...

For all of you running higher octane fuels for "better fuel economy" or because it is "better for your engine", I think you're wasting your money unless you've increased your compression ratio.

Here's a blurb from HowStuffWorks.com:


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 name "octane" comes from the following fact: When you take crude oil and "crack" it in a refinery, you end up getting hydrocarbon chains of different lengths. These different chain lengths can then be separated from each other and blended to form different fuels. For example, you may have heard of methane, propane and butane. All three of them are hydrocarbons. Methane has just a single carbon atom. Propane has three carbon atoms chained together. Butane has four carbon atoms chained together. Pentane has five, hexane has six, heptane has seven and octane has eight carbons chained together.

It turns out that heptane handles compression very poorly. Compress it just a little and it ignites spontaneously. Octane handles compression very well -- you can compress it a lot and nothing happens. Eighty-seven-octane gasoline is gasoline that contains 87-percent octane and 13-percent heptane (or some other combination of fuels that has the same performance of the 87/13 combination of octane/heptane). It spontaneously ignites at a given compression level, and can only be used in engines that do not exceed that compression ratio.


So not only is it not better for your engine, it also burns slower which means you're not getting as much "bang" for your buck and you've increased the possiblitiy of unburned hydrocarbons getting out of your combustion chamber. (= not better mileage).

I hope this saves some of you some $$$, instead of burning it (pun intended) on more expensive gas. Save it for your mods.

so then what compression ratio does a DOHC ZC have, and what is the best octane to use with an MSD ignition and advanced timing? And would it make a difference to change the spark plug temp in conjunction with what octane level to use.

unless you have 10:1 compression or higher, or are running nitrous or boost, then regular unleaded is your best bet.

87 for me...i have kids.

good point pauls81sc...my engine knocks no matter what kind of fuel i use..well, just till it gets warm..then it stops...i couldn't afford any higher fuel anyways, my kids take my money.

So not only is it not better for your engine, it also burns slower which means you're not getting as much "bang" for your buck.


I appreciate the article, but I disagree with the above statement. How does an increased rate of fuel consumption give you more "bang for the buck"? The whole idea behind better mileage with a higher octane is that BECAUSE it burns more slowly, you run through a tank of gas less rapidly than you would with a lower-octane gas.

i rUn 0n 19,000.1 0ct@n3 b!tch3$

Good question. But I think you are confusing rate of consumption with rate of burn.

The "charge" of air and fuel is only in the combustion chamber for a fraction of a second. You want it to burn completely and as fast as possible before the exhaust valve opens and lets the gases escape (=rate of burn). So slower burning fuels (i.e. higher octane) may not be completely spent before leaving the combustion chamber. The gases driving the piston are also expanding at a slower rate so you're getting less "bang".

Fuel consumption is a matter of how much is being injected by the car's fuel management system. Which will be the same regardless of what octane you put in the car. With slower expanding gases and possibly unburned fuel exiting the combustion chamber, it's not going to be MORE efficient. Probably not less efficient either, but nonetheless not worth the extra $$$.

91, its the highest here, and I figure my motor got at least 91 octane in the motherland, so I'd assume using 91 would be best for it...

I use minimum 98 oct or if I go to Austria I take 100 oct one, Shell Optimax (this is the gas that F1 runs on) and on that 100 octane gas car is runing so much better and goes a lot faster...my mechanic said that I should put in min 100oct cause of my CR

CYA

For all of you running higher octane fuels for "better fuel economy" or because it is "better for your engine", I think you're wasting your money unless you've increased your compression ratio.

So not only is it not better for your engine, it also burns slower which means you're not getting as much "bang" for your buck and you've increased the possiblitiy of unburned hydrocarbons getting out of your combustion chamber. (= not better mileage).

higher grade fuel helps prevent detonation, which is the reason for the slower burn. if you want the most bang, just have it detonate all day. i doubt that premium burns slow enough for unburnt gases to escape; it has all of the power/downstroke to burn(btw, its preferred to have combustion through out the powerstroke, not just the beginning of it).

you're right that premium isnt for power or increased fuel ecomony, but it does help the engine run cleaner by helping it prevent detonation and usually higher octane fuels have more additives than lower grades; which can help with the emissions.

i have a d15b with just little head milling and advanced timing, it pretty much wont run on anything less than 93(we dont get 91 over here), which is what i use. I also got my cousin to start using premium on his 96 dodge neon. he says the engine is much smoother.