93 octane in N/A motor.

[S3t0_S13]

i wana switch over from 87 to 91 on my KADE

flame away if you must, but what is the major benefits of advancing timing, and running higher octane?

[mmm240]

i run 93 on all my vehicles, and not just because it's the best at the pump. i've actually tested 87, 89, 91, 92, and 93 on each and 93 fells better. just like you posted about

[SR20drftSX]

damn dudes....i didn't think i was gonna spark such an interest!.. but thanks alot guys, and i think when we re-did the timing on my ka-e its advanced so its dumping more fuel into the system because it smokes black a lil on start-ups and rev's.. and im getting terrible gas mileage- like around 18-22 mpg , where as i was gettin near 25-29 with the last motor.(ka-e) , i think ill be switching to 93 and see where that gets me...thanks again , and happy driving

[ken240sx]

you people are tards thinking the ka is a high performance motor, and your 15 so you are sucking on moms titie, btw whats for dinner tonite im hungry.

lol try telling Ivan that the KA isn't a performance motor...he'll drop down a high 8 sec 1/4 mile just to prove you wrong. he runs low 9's all day. actually try telling any KA fan that the KA isn't a performance motor. Alos ask most sr20 owners why they swapped it in....most have swapped it in because of the bandwagon, super street, and it's got more hp than the ka...even tho you slap the smallest turbo with no intercooler on the ka for 500 bucks you'll give the 3 grand sr a run for its money.

and yes, this is now a KA vs SR thread, so feel free to lock it LOL.

[ken240sx]

i do realize that you probably have an rb, and i realize that it's more of a performance motor than the KA was intended, but please don't knock the KA in a KA based thread, feel free to knock the sr tho lol!

[ken240sx]

jk guys i got love for all engines thrown into 240's, unless someone puts a honda engine in it...then whoever you are, you can leave the forum right now.

[RB20DETodd]

lol try telling Ivan that the KA isn't a performance motor...he'll drop down a high 8 sec 1/4 mile just to prove you wrong. he runs low 9's all day. actually try telling any KA fan that the KA isn't a performance motor. Alos ask most sr20 owners why they swapped it in....most have swapped it in because of the bandwagon, super street, and it's got more hp than the ka...even tho you slap the smallest turbo with no intercooler on the ka for 500 bucks you'll give the 3 grand sr a run for its money.

and yes, this is now a KA vs SR thread, so feel free to lock it LOL.

ka is cool till it throws a rod.

[Nissan240Sound]

Quoted from the Wikipedia from Page 1 -

The power output of an engine depends on the energy content of its fuel, and this bears no simple relationship to the octane rating. A common myth amongst petrol consumers is that adding a higher octane fuel to a vehicle's engine will increase its performance and/or lessen its fuel consumption; this is false—engines perform best when using fuel with the octane rating they were designed for and any increase in performance by using a fuel with a different octane rating is minimal or even imaginary.

[nzmoman]

i wana switch over from 87 to 91 on my KADE

flame away if you must, but what is the major benefits of advancing timing, and running higher octane?

i thought that most EFI cars had this controlled in the computer through the emissions system. Doesnt the computer make the adjustments on its own if you run 87--93? Your emissions reading will change between the different octanes so I thought the computer read that and then made the adjustments in your timing as the adjustments are minor.

[ken240sx]

any engine at any time can throw a rod. plenty of ka motors over 200,000 miles have never thrown rods. the reason why rods are throw to begin with is lack of maintenance, bouncing off the rev limiter excessively, and wear/tear....but 6 out of 6 owners locally with over 100,000 miles, and 3 of which are over 160,000 have never had any internal problems in their ka's. there's people jus on this forum that boost their ka's with over 200,000 miles and have no problems and throw down 13's and have never even gone beyond taking off the valve cover. also, the point of higher octane in most applications is to reduce rod knock. if you run a higher octane, you will have less knock...if you have more knock...you'll have more problems and maybe end up throwing a rod..right? right. so the topic of this thread is?? adding the recommended octane or higher to your ka which will help reduce what is it now...the word is knock. if anyone throws a rod with a ka it is either their own fault for abusing it or the previous owners. now i could sit in a car with a "true performance" motor such as a vette per say, and bounce the fugger off the rev limiter and create a nasty rod knock just as easily as it would be for any other engine on the market.

[redtop91]

most have swapped it in because of the bandwagon, super street

I think you are THE stupidest person on this forum now. Stop posting. It makes baby Jesus cry.

[ken240sx]

I said most, not all, which means probably 60-70%. also i mentioned i got love for all engines, and i'm not knocking the sr, as it is full of the performance potential to back up any reasons why someone would swap it in. but i'm a ka guy and of course i'll down talk the sr, and you're probably an sr guy so of course you're gonna down talk ka's... its just the way of the 240. i expect the ka to be made fun of on a daily basis, but the least i could do was stick up for it. I can also say that about 50-60% or so of the ka-t's out there are probably just bandwagon riders also. in every engine choice there are die hards, and posers...but there's usually more posers than anything. and baby Jesus doesn't cry because of me ok. he's just a baby, he's gonna cry either way....

[SPIRONIUM]

Quoted from the Wikipedia from Page 1 -

The power output of an engine depends on the energy content of its fuel, and this bears no simple relationship to the octane rating. A common myth amongst petrol consumers is that adding a higher octane fuel to a vehicle's engine will increase its performance and/or lessen its fuel consumption; this is false—engines perform best when using fuel with the octane rating they were designed for and any increase in performance by using a fuel with a different octane rating is minimal or even imaginary.

Thanks, i was looking for that..

let me modify my original post: there is zero reason to run anything higher than 87 for a ka24e or 87-91 for a ka24de unless the fuel map is different from stock or the timing is advanced, if you feel benefits from 92+ octane it is your imagination. But if that makes u happy then go for it

[S3t0_S13]

and baby Jesus doesn't cry because of me ok. he's just a baby, he's gonna cry either way....

roflmfao

[kick_it_sideways]

I believe octane in fuel is used primarily as a flame retardant. Therefore it serves the purpose of preventing fuel to combust earlier than it should. (Higher octane would definitely prove to be beneficial in higher compression engines) So regarding the 240sx's, using higher octane would prove to be on the "safer" side of things, but since most of them are not race cars, wouldn't the higher rating of octane render it useless? (Therefore, lower octane = no difference and less $)

[PyroTecK]

From the 91-94 240sx fsm... and

"Different countries have some variation in what RON (Research Octane Number) is standard for gasoline, or petrol. In the UK, ordinary regular unleaded petrol is 91 RON (not commonly available), premium unleaded petrol is always 95 RON, and super unleaded is usually 97-98 RON. However both Shell and BP produce fuel at 102 RON for cars with hi-performance engines, and the supermarket chain Tesco began in 2006 to sell super unleaded petrol rated at 99 RON. In the US, octane ratings in fuels can vary between 86-87 AKI (91-92 RON) for regular, through 89-90 (94-95) for mid-grade (European Premium), up to 90-94 (RON 95-99) for premium unleaded or E10 (Super in Europe)" - from http://en.wikipedia.org/wiki/Gasoline

make up ur own mind

[freakyjason]

i know that this question is very off topic but you wouldnt happen to go to syracuse university would you karmapolice991? just wondering.

[SR20drftSX]

ummm well FIRST off , Wikipedia is an opinion based website , and I myself could go on there and make a post that says only run diesel in your NA Ka-e/de motor for the 240sx...that doesn't mean its true...although some knowledagle person may have typed it up, doesn't always mean its true tho

[ken240sx]

Quote from howstuffworks.comhttp://www.howstuffworks.com/f...part1/

"If you are already using a fuel with an octane rating slightly below the optimum, then using a higher octane fuel will cause the engine management system to move tothe optimum settings, possibly resulting in both increased power and improvedfuel economy."

this means that, the manufacturer's recommendation to use 91 is there for a reason, 91 is the what the engine is tuned for, if you use 87 you're engine won't run the same, but once it tastes the sweet 91 again, it will go back to it's optimum fuel maps. which explains what many people have already said, that you may be able to feel the diference between 87 and 91 octane fuels...but not between 91 and 93, 93 is only recommended if the compression increases or your timing is advanced. otherwise your wasting your money on 93, unless thats the only premium fuel you can get.

[kornaz]

I loled real hard. People need to f*cking start reading. Let me sum it all up.

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".

There is one piece of information we have been missing. The compression ratio of an engine has a lot to do with knock and the apparent effects of octane. Compression ratio can be thought of as the pressure in the combustion chamber. High compression ratio engines have more of a tendency to knock than lower compression ones. Given what we know, since a low compression engine is not as likely to knock, it does not require a fuel with as high of an octane rating. A high compression motor, however, needs more octane to reduce knock. In such a case, switching to a higher octane fuel would reduce the effects of knock, leading to a more efficient combustion process. This creates more power and better fuel economy. Using a higher octane fuel in an engine that does not experience knock will not help performance. In fact, if the higher octane was achieved through the use of oxygenates, higher octane than necessary may actually hinder the performance of an engine!

[PyroTecK]

u have a very good point, although it is the factory fsm that is stating what type of gas should be used. The quote from wikipedia is just there to help clear up the differences between aki and ron octane ratings.

[kornaz]

Factory also put nasty as* offset wheels on it too. Does that mean it is the best? Also the sh*t changed a lot thru years. This discussion can be endless, but putting the highest octane gas in your car is not necessary. Factory did not do lots of the right stuff. All they think is how to make more money, and spend less making it.

[S3t0_S13]

is 160 compression enough for 91 gas??

[kornaz]

http://en.wikipedia.org/wiki/Compression_ratio

[Bumnah]

unless it's stated that premium is required, i use 87. once in a while i'll throw in the 93 to be nice, but it's a waste unless it's required.

higher octane to simply put it, is tougher to ignite than lower octane, so it's more stable in higher temp motors. helps keep detonation at bay.

please. let the flaming continue.

[mmm240]

you say that you throw in 93 to be 'nice'so you beleive that it is better?

[babowc]

Factory also put nasty as* offset wheels on it too. Does that mean it is the best? Also the sh*t changed a lot thru years. This discussion can be endless, but putting the highest octane gas in your car is not necessary. Factory did not do lots of the right stuff. All they think is how to make more money, and spend less making it.

roflthat is the stupidest comment on this thread.so, you'd want to get baller wheels from factory?what?18x10 -10?ROFL.. YOU FTL.

[ken240sx]

BALLIN!

[crash n burn]

i've always ran 89..and every what..5th fill-up? gone on a tank of 93..just for the pure fact that it'll clean everything out fairly well..

my jeep is pushing 190k and still kickin

[SR20drftSX]

JEEPS FTW! , it better be a Wrangler