hey, i was wondering...is there much of a benefit in buying higher octane gas? i mean, is it really worth it to pay more for like 91 instead of 87? i know it is better for your engine, but other than that, what is the difference? sorry if this is a really noob question, i am just wondering. thanks

edit: by the way, i have a 97 RS

 

thats a good question i always wondered that too... but i have no idea sorry

 

not worth it... unless yyour running serious all motor or forced induction

 

It's not worth it. If your car only needs 87, use 87. If you have a GS-R and it specifically asks for 91 or higher, then use 91 or higher.

 

no benefits on running higher octane gas, use whatever the car recommends..
from what i remember learning in class.... some cars will acutally lose power, while running higher octane gas if the manual does not recommend so.


higher octane is used to prevent predetonation. Only for cars that require high octane rating.

 

thanks for the info guys. of course, i would have a hard time shelling out the $$ to pay for higher octane gas anyways, since it is so damn expensive now

 

i only use 93 because it seems to give me about 1 extra mpg...maybe its just in my head...havent used 87 in over 2 yrs.

 

yea its not worth it. i have a all motor ls and i still put in 87, smokin the gsr's mmuuuuhhhaahaaahaaahaa *sinical laugh* lol

 

yes, and in fact it is not "better" for your engine... and will probably make less power as well, but then again people said that

 

does anyone have any hard data on running 87 vs. 91 in a 'teg? With the 10:1 compression, I can't believe that it wouldn't make a difference.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by amerikinjesus &raquo;</TD></TR><TR><TD CLASS="quote">does anyone have any hard data on running 87 vs. 91 in a 'teg? With the 10:1 compression, I can't believe that it wouldn't make a difference.</TD></TR></TABLE>Your signature says GSR, so you're supposed to use 91. Everyone else is saying that for an LS or some other car that doesn't NEED 91, it won't really improve anything. Besides, it's not ONLY compression ratio that counts. It's also combustion chamber design, temperatures, spark timing control, etc...

 

I use nothing but 93 octane in my teg.

 

with my type-r motor I only use 93 octane, if I had a Gsr I would use only 91 and I would use regular for an ls. One time I by accidently filled the car with half regular untill i figured it out. I honestly felt no difference in feel/power, but maybe it's just me. I don't hope it didn't do damage to my motor

 

*sigh*

here is what I really want to see

an actual chemical comparison between many brands of 92-93-94 octane gas to find out who is cutting higher octane gas, and who is adding to lower octane gas

So what if it is all the same using the r+m/2 method or whatever the ****

I want to know the true Motor octane of my gasoline and buy it accordingly

 

VP fuels C14 has a motor of 114 and a research of 116, the (R+M)/2 shows 115 - thank god for the power of averaging)

Thats only a 2 point spread between research and motor, but some have an almost 15 point spread

so basically gas station 1 could have 93 octane gas with a 92 motor octane rating, while station 2 has 93 octane with a 86 motor rating

its still 93 cause of the way they get the number... farking stupid if you ask me

 

Higher octane can resist detonation better than lower octane gasses. That is why B18C's have a "premium only' recommendation and B18A\B's don't. B18C's have higher compression which needs the higher octane so the fuel doesn't detonate before being ignited by the spark plugs because detonation = very bad. The same rule applies to race engines that use race gas, which is hiigh octane.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by FastSS &raquo;</TD></TR><TR><TD CLASS="quote">... while station 2 has 93 octane with a 86 motor rating...</TD></TR></TABLE>That would have to be 100 research octane. RON & MON are just different ways to measure the same thing. Neither method uses an engine identical to YOURS, so it's kind of a stretch to say either one is a more 'appropriate' measurement.

Fuel from a gas station is a commodity, it all comes thru the same pipelines, from a few refineries in the country. They might do some blending at distribution points, & maybe put in different additives for different 'brands'. From week to week it isn't gonna be the same, so chemical analyses have to be repeated all the time, otherwise they don't count.

 

i have a gsr ill buy 91 if i have to money but any other time i use 87 doesnt make any difference

 

whats with all the posts lately on "should I spend 20 dollars? or 24 to fill my tank?"

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by VTECorona &raquo;</TD></TR><TR><TD CLASS="quote">Higher octane can resist detonation better than lower octane gasses. That is why B18C's have a "premium only' recommendation and B18A\B's don't. B18C's have higher compression which needs the higher octane so the fuel doesn't detonate before being ignited by the spark plugs because detonation = very bad. The same rule applies to race engines that use race gas, which is hiigh octane. </TD></TR></TABLE>

You beat me to it. Great explanation btw.

 

If you know your car well enough, u can tell the difference..93 in the RRRRRRRR Money in my wallet hehe

 

I've read some curious stuff on octan ratings. Somewhere I saw that the recommended octane for the gsr is 91, but a lower octane can be used with performance loss.

IMO, the gsr has a knock sensor, it can take regular gas no problem. You'll loose a bit of power, but if you cant tell the difference, then ...there ya go.

Using a lower octane is only bad if you detonate, but if the knock sensor is working as it should, then there is no danger.

I personally use 91, but I may downgrade to 87 if the prices get too extreme. once they hit 90 cents / liter for premium I'm gooing to 87 and fuckit.

 

I think what most people, including myself, sometimes think is "the more expensive, the better" which is why people think more octane = better. You may see a slight increase in mpg, which is probably just from better ignition.

 

I"m sorry, but seriously man...

STOP BEING CHEAP!!!

I'm so sick of people bitching about gas prices. Octanes only vary 15 cents per gallon at the very very most. You can find that on the ground as you walk to pay for it at the gas station

 

Here it is......if you are driving a GSR or Type R.....you need to have 91 or above. Any less than that you will lose power. In your case.... the LS and/or GS....you need only 87