what octane???
 

may seem like a simple question..

but i need a simple answere..

what is the highest octane gas i can run in the lude?

will it hirt it if i run like 98** (or what ever the higest is that i can get at a regular station)?

thanks a lot!:) :) :)

Re: what octane???
 

lol why would you want to run 98???

I beleive the ratings are 87 89 91. I'm sure you can get away with 89, my civic actually ran worse on 91, but don't know about a lude.

You can get 93 where I am.. and 96 supposedly has 100.. or so I heard years ago.. but I have yet to see it.

lol stick to 89. They say to run 93 in the GSR tegs. You aint gaining nothin just paying a hell of a lot more than u would with just 89

I run 93 in the maxipad i dunno why it just recommends it but i dont care i just do it.

I would say not to run more than 89, you'll probably waste money on the 93.
and with the current gas prices it'll be cheaper, I'm considering running 87 instead of 89 myself cause it's hit a high of $1.93 per gallon:o
$2.03 for 91 this is getting ridiculous

Why would you WANT to run a high octane? You should be asking what is the LOWEST octane rating you can run is.

Octane rating DOES NOT equal power. Cars with aggressive compression and/or boost just need it to prevent detonation. Your Prelude falls into neither of these categories.

You'll actually get MORE performance out of the lowest octane rating you can run (since it is less resistant to ignition). So save some money, make some power, and just run good ol' regular 87.

and it all depends on the ignition timing. the more advanced it gets the higher octane it requires. for some reason i noticed that manufacurers reccomend the 86 and higer for cr of 8.5:1 and 93 octane for 9.5:1 and higher. also the higher the octane gets the hotter the temps inside the cylinders will be

I can buy 94 oc and used to because my old car required it at one point. Then I found out that it will run on lower just with not as much power.

I was under the impression anything over 100 was conisdered in the class of jet fuel.

haha i dont WANT to spend all that money.. for some reason the the exhaust smells like crap.. so much people wont even follow behind me. i was told to run better gas...but thanks for the help guys!

since its a 10:1 compression you have to run at least 91 according to the manual, running too high of octane burns too hot and you can damage your o2 sensors im told.

Does anyone here actually KNOW what the octane rating is a measure of or what it means? This thread is so full of misinformation, it's embarrassing.

Someone just delete it before anyone else sees it.

so stop being an asshole an educate us "Mr. I-Know-everything-thing-there-is-to-know-is-this-tiny-little-world"



jack the compresion up to like 11:1 in your car and run 89 and then run 91 and tell me you dont notice a difference...






little over-zealous with the shift button arent you?




I think that my cr is like 9.5 but i put in 83....im a cheap ass. Does the Type -S take premium(93)? I dont think i have ever thought to ask or look it up before....:confused:

I agree.

your cat is probably bad, it has nothing to do with the octane of the gas.

doubtful since my civic came with 9.2:1 compression ratio and is supposed to be run with 87, then the newer civics have like 9.5:1 and also run 87.

octane doesnt make anything hotter either.

jet fuel is something different entirely

you were told wrong, it doesnt burn hotter nor will it damage your o2 sensors.

the octane rating is the measure of a fuels abiltiy to resist pre-ignition.

the only reason you may gain power from running a higher octane is that when running a lower than optimum octane fuel it causes pre-iginition or knock, most modern cars have knock sensors, when they detect the knock they tell the ecu which then retards timing consequently decreasing power, and allowing you to skate by with cheap gas and not harm the engine. then when you stop being a cheap ass and run the higher octane stuff the ECU will go ahead and advance the timing to where it should be.

therefore you do not gain power from running a higher octane, you just lose power by running low octane.

While this is true for the most part, there are cars that relize you are running a higher octane and actually advance the timing automaticly.

its only going to advance it to where the factory set it at in the first place which was based on a certain octane, the octane they recommend you run.

It will have two timing settings. 1 when you run the lower octane, and 1 where you run higher octane. The higher octane setting will deliver more horsepower to the wheels. And the lower octane setting will deliver the engine rated power.

*edit* and its not advancing, if its set to factory setting.

lol it's not worth all the effort and $ to gain like maybe 3 hp

remeber the dyno i showed you? that was with 93 octane, and the car made around 270. on 89 octane the car makes around 240. To me an extra $3-$5 at the pump seems worth it.

Its also not that much more expensive. Currently uleaded is 1.89. I usually get about 12 gallons. Which is $22.68.
Now for premium its 1.99 and for 12 gallons thats $23.88 per fill up.

Yea breaking the bank with that buck 20.

so they just dont tell you about the extra hp that could help sell the car?? i doubt it.

It doesn't matter what you doubt. I just stated there are dynos to disprove what you doubt.
Hell theres even a video of a stock accord pushing 218 hp at the wheels when it was tested. Now if you account for drivetrain loss thats right around 270. Then there are dynos of the exact same accord pushing around 195 with like condtions.

no they do it so that the insurance is not ungodly high on cars then in that area so then more people will buy them. I dont remember what ford it was but it was underrated for like 300 hp or something in all reality it had like upwards of 500. They do it to sell cars not keep them on their lots

^ there was that reasoning, and also another point brought up was that the acura tl is rated at the same hp. And honda didn't want to look like it was selling the same car for less.

ROFL.. 30 hp with a few more octane points?? You are fucking with us right?? Please tell us you jfwu....

No you don't get 30 hp from 4 octane points lol.. and your car has 240 stock.. if it made 270 they would advertise it at 270.. It's not like it gets put into some racecar category lol.

And yes.. Ford said back in 1970 that their Boss 429 made something like 390hp when it actually made about 550+ hp and was basically a racecar that did 11s outa the box. They hid the fact that it was a racecar by underrating it.

Trust me ... PLEASE.. they didn't underrate your car.. if they thought it made 241hp believe you me they would claim it as 241.

No, it's boosted. And, as I said before, if you're running boost, you have to use a higher rating to prevent detonation.

When the contents of the cylinder are under more pressure (as in boost or high compression), they become more volatile, and are therefore more prone to detonation, preignition, knock, whatever you want to call it, and a higher octane gasoline becomes necessary in order to prevent these things. However, running a higher octane gasoline than what is necessary will not boost performance- only hurt it (minimally, but it's still detrimental, nonetheless).

As for automatically advancing the timing, you're backwards. Many vehicles come equipped with a knock sensor that automatically retards the timing if it detects detonation.

Thank you, drdingo, for unwittingly providing information to back up everything I've said thusfar.

VR4, please don't knock my use of the shift button to add emphasis to some things when you can't use it to capitalize the first letter in a sentence. As for your 11:1 remark, reread this thread. I've mentioned high compression numerous times. Read, think, and reply. Please don't skip the first two steps.

sigh.... Then explain the 218 to the wheels.
The dynos were broke?

WTF? ford does it and your all about it. Honda does it and your like " its not underrated, even though the dynos are proving different, i say it isn't so so your wrong."

I seriously hate talking to you. Your so narrowed minded it hurts, not to mention hypocritical ( i know, they are big words. But you can look them up. http://www.<a href="http://www.dicti...ionary.com</a>)


So, you can't read? Or lack common sense? I said the exact oppsite of what you said.

First off.. you don't have any idea what % hp you get to the wheels. No way of knowing unless you do a chassis dyno vs engine dyno.

Second.. I can easily see a company underrating a TRUE performance car, not a family sedan lol. No insurance company gives a shit if your car makes 240 or 270 hp. It's still a family sedan to them. Now, if your car had upwards 350-400hp, and parts were harder to get then a typical dime a dozen honda, then maybe they would care.

Its a coupe. Just like you car. 2 doors ( the number after 1). I never said they did that for insurance purposes.

And this topic has been beaten to death at a couple of fourms. So search instead of just talking dumb shit (like your doing now).

Honda engineers are quoted at saying higher octane will add +15hp/10+ to the WHEELS.

Next time search. doche

Alright, check this out. It's like an SAT question.

Boost and high compression require a high octane rating.

Boost and high compression equal high preformance.

True or false: High octane equals high performance.

FALSE. It's like the good ol' all squares are rectangles, but not all rectangles are squares.

I've been saying all along that boost and high compression require a high octane rating. Your example is boosted. Like I said- proving me right, all along.

Find me a dyno of an NA motor running normal compression that gains even 5 hp off of premium gasoline, and I will concede defeat.

Running premium gasoline on an engine that doesn't require it is sheer ignorance, as is attempting to argue it without all the facts. You simply don't process information well, then you attempt to respond with a lack of understanding of what has been said. Replying is a three step process.
1. Read what has been said.
2. Think.
3. Reply.
You seem to be skipping the first two steps.

And "douche" has a "u", phucktard.

Your not listening.

If you run a 2003+ accord with 87 octane (the recommend) it will put about 195 hp to the wheels. If you run that same car with the same conditions with 93 octane, the computer advances the timing and the car will put 218 to the wheels. Like i said before this is common knowledge on several forums. SEARCH.

Whats funny is you correct my spelling, then spell a word wrong right after that, its spelled with an "F" not a "ph":rolleyes:. Are you one of those anal attentive people that tries to make fun of people for little shit, then goes and cries when he gets his feeling hurt?
Because if so ill have you crying to mommy before you truly realize your idiot.


*edit* for spelling. I spelled a word wrong and don't want you to whine some more.

exactly. Honda rates the 92-95 civic ex's at 125hp, then upped the compression a little for the 96-00 and made sure to rate it at 127, they werent like "oh no this is getting a little too close to the acura LS power rating, lets keep it at 125"

ok, where the hell do you get that 218whp is somehow equal to 270hp!? in a fwd car no less.

I always thought a good estimate of % drivetrain loss for FWD vehicles is about 12%...12% of 240 is 29hp...240-29=211hp which is pretty damned close to your 218hp dyno tested accord.

Exactly.. but there is no true way to figure out drivetrain loss.. EACH car will be different.. and I don't care what car you drive.. 4 octane points does NOT get you 30 hp rofl. You don't know a damn thing about performance and never dynoed a motor. You just search the internet like a monkey and believe what other idiots tell you.. congrats on being weak minded. I dynoed my motor with 105 octane to prevent and possible det and it did fine. Then I went to 93 to see is 93 produced any det. 93 produced more power than the 105 by something like 2 hp. Not to say 93 is better.. but by your calculation I should have lost like 90 hp dropping that many octane points!!