87 and with gas the way it is now I'm glad I can.

 

Im not claiming any HP gains. i havnt track tested it. very little is done to my car. intake exauhst, removed PS and AC.

Im just saying that when i have a full tank of 87, i have a hard time scurt'ing 3rd(few and far inbetween). Now when i run a full tank of 91, i can almost consistantly scurt 3rd. I just got 12 gallons of 112 today for 18 dollars. I will run my tank damn near dry, and pour all of that in. Perhaps there will be less power or maybe more. i will just have to wait and see.

Im just sayen what i feel. maybe its in my head, sure.. but if it is, i think im gunna run higher octane all the time because my head is making me drive better somehow- if im able to peel out in 3rd more consistantly, and it feels faster.

Like another poster said it feels as though it revs up quicker, and smoother. id have to agree with him.

 

Marshall Brain has the answers...

http://auto.howstuffworks.com/question90.htm

Non-turbo rotaries have a relatively low compression ratio which means they can use lower octane with less risk of detenation. Think of the lower octane not as cheaper, but as more volitile... and the differences between "regular" and "premium" gas are some additives and corporate marketing.

HSW also mentions heptane and octane, which have 7 and 8 carbon atroms chained together respectively. Heptane is volitile while octane is rather stable. The octane rating is an artifical scale that gives a "what if" presuming you had x% octane and y% heptane. 87 octane gas would be like running 87% octane and 13% heptane.

(Source: Paraphrased from memory, from Modern Marvels: Gasoline)

Here's a link to wikipedia.org on the subject.
http://en.wikipedia.org/wiki/Gasoline

-Twofer

 

Can a FC3C (1988) use flex fuel? (E85 ethanol) heavily marketed in the midwest.

 

No, I don't use that ****, cause most of it is LEADED, and kills spark plugs and O2 sensors.


To me, it does not smell like "candy" - yes, I do no[sic] what race gas smells like.

Sorry, I call your BULLSHIT on "86 race gas" unless you can show proof.
I think the place selling you this crap is bending you over pretty good.


-Ted

 

lol...

 

**** all you fake rx7 owners you should be driving a chevy

 

87

 

The NA was made to run 87 RON, which by linear approximation (can't find a formula) is about 83-84 AKI or R+M/2.

 

Where did u get that from?

linear approximation... WTF? lol
http://en.wikipedia.org/wiki/Linear_approximation

Dood if u use big werds like that then someday someone who really knows what it means is gonna pwn u.

 

At the very least linear approximation means an approximate value calculated from a best fit line from a plot of data in calculus terms. I took AP calculus my JR year of HS... I am someone who knows what the word means jackass.

Also I got that it's tuned for 87 RON from these boards.

 

lol no you aint.

Teh forumla is R+M/2 and even I can work that and Im a jackass like u say, so whats that make u? rotfl

BTW I aint had AP nothin

Link?

FYI thats not what teh manuel sez

 

You are stupid. I didn't include my data points, granted... I based my linear approximation on Jaguar documentation that listed both RON and R+M/2 of various fuel grades. I then APPROXIMATED based on the LINEAR relationship between the two sets of numbers. This isn't completely accurate as the relationship is not completely linear, but it is close enough that it doesn't make a difference unless i was trying to figure out what the RON value of 2000000 R+M/2 would be. R+M/2 is NOT the formula I'm approximating, it is a formula used to get one of the sets of data points I'm using. By the way, I CAN work that formula, it's a freakin average.

I can't link something I read a long time ago, search. Does the manual specifically state 87 R+M/2? if not, it's a Japanese car... they use RON.

Do I need to make you a graph?

Edit: The reason there isn't a formula that I could find to convert between the two is that one is Research value, the other Research + Measured / 2. In order to convert, you would need M, but you knew that, right?

 

So if teh manuel does specifically state it does that mean ur the one who is stoopid? lol

https://www.rx7club.com/showpost.php...0&postcount=42

No thanks I dont need no graph to tell me what everybody knows cept 4 you lol

 

No, it means that whoever provided me with the information that it was tuned to 87 RON is stupid. It doesn't say anything about my calculus ability, which is up to par. And my knowledge of the term 'linear approximation' is also correct. Looks like the only thing that makes me stupid is that I occasionally repeat misinformation, which we're ALL guilty of.

 

If you didn't speak like an incoheirent jackass, your arguments would seem a bit more competent.

 

ur right but Id rather b dum then be a pozer who acts competent by using fancy werds and math forumlas

so ur sayin I would sound smarter if I called people a jackass or called people dumb like SOME people on this forum do? somehow that dont sound rite 2 me

 

No, really... since when is Linear Approximation a fancy word? I think everyone here knows what a line is... and maybe some people don't know what approximately means, but I hope they do.

And calling people stupid is different than calling them dumb?

I'm sorry that you're trying to make yourself feel better about how poor your math skills are by making derogatory comments about mine.

Edit: by the way... linear math is some of the easiest out there.