Theoretical Octane Question
08-17-07, 11:01 PM
#26
^^ OR
You could get a wideband, and properly tune your car. I think for an NA you're shooting for 13-14 AF's depending on condition.
Edit: you also need a fuel controller (SAFC, Rtek, Emanage, or a full EMS like Haltech, Microtech, Wolf3D, Megasquirt).
If you aren't going to tune your car this way (too expensive or w/e) then just fill it with 87 and enjoy. You aren't hurting anything.
You could get a wideband, and properly tune your car. I think for an NA you're shooting for 13-14 AF's depending on condition.
Edit: you also need a fuel controller (SAFC, Rtek, Emanage, or a full EMS like Haltech, Microtech, Wolf3D, Megasquirt).
If you aren't going to tune your car this way (too expensive or w/e) then just fill it with 87 and enjoy. You aren't hurting anything.
You'd calculate how much of a safety margin there would be at 84 octane, apply the same safety margin to 87 octane, then lean it out to match the new A/F ratios. 'Course if someone realized how little there is to gain without risking their engine (in the long run), they might not want an SAFC/etc. anymore.
08-20-07, 06:13 AM
#27
All 2Gen RX-7's are rated for a minimum (R+M)/2 octane rating of 87 with no more than 10% alcohol. Due to variances in fuel, engine condition, and tuning, Mazda recommends that you stick within these parameters. Much like the stress rating on a bridge, aircraft wing, etc., there is a fudge factor built into those numbers, but it is best to stay within the given parameters for safety and reliability.
).The octane rating is only an anti-knock rating. It has nothing to do with energy content, acceleration, deposits, emissions, gas mileage, chi, juju, mojo, or anything else. See here:
http://www.ftc.gov/bcp/edu/pubs/cons...tos/aut12.shtm
If you are looking for a fuel with more power, you need to ask the manufacturer for the "energy content". Assuming the same fuel density and air-fuel ratio, a fuel with a higher energy content will produce more power than a fuel with less energy content.
My car runs a lot better when I use the gas from a particular gas station with a green sign. Therefore, you guys should really be using gas from a station with a green sign if you want your car to run the best. Do you see a problem with that logic? Good, now apply that to the octane rating and you will be at one with reality.
http://www.ftc.gov/bcp/edu/pubs/cons...tos/aut12.shtm
If you are looking for a fuel with more power, you need to ask the manufacturer for the "energy content". Assuming the same fuel density and air-fuel ratio, a fuel with a higher energy content will produce more power than a fuel with less energy content.
My car runs a lot better when I use the gas from a particular gas station with a green sign. Therefore, you guys should really be using gas from a station with a green sign if you want your car to run the best. Do you see a problem with that logic? Good, now apply that to the octane rating and you will be at one with reality.
08-20-07, 09:51 AM
#28
Junior Member
Join Date: Oct 2006
Location: Wharton, New Jersey
Posts: 36
Likes: 0
Received 0 Likes
on
0 Posts
Octane Rating.
I know that Sunoco has a 86 Octane rating in their lowest priced fuel. To my knowledge this is the LOWEST Octane Rating you can get in this country.
For general info:
Citgo
Sunoco
Conoco
Sinclair
BP/Phillips
Hess
Arco
The companies mentioned above buy NO Saudi Oil to make any of their GAS or other products with. IMHO, If you are tired of the Arab Countries sticking it to us then this is the way to go!
Let the Saudis drink their oil. If we bought from other sources they would lower their prices to pennies per gallon. You can't EAT or Drink the stuff.
I heard from someone who supposedly knows these things that Bush's silent money partner (Backer) was/is Ben Ladens father. I also heard through the grape vine that the reason we fought Desert Storm was because the Off Shore Oil Rights Holdings Neil Bush held would be lost if Saddam took over the Saudi Oil Fields.
For general info:
Citgo
Sunoco
Conoco
Sinclair
BP/Phillips
Hess
Arco
The companies mentioned above buy NO Saudi Oil to make any of their GAS or other products with. IMHO, If you are tired of the Arab Countries sticking it to us then this is the way to go!
Let the Saudis drink their oil. If we bought from other sources they would lower their prices to pennies per gallon. You can't EAT or Drink the stuff.
I heard from someone who supposedly knows these things that Bush's silent money partner (Backer) was/is Ben Ladens father. I also heard through the grape vine that the reason we fought Desert Storm was because the Off Shore Oil Rights Holdings Neil Bush held would be lost if Saddam took over the Saudi Oil Fields.
08-20-07, 10:04 AM
#29
is The Whoopieschnootz
Join Date: Apr 2005
Location: Asheville NC
Posts: 700
Likes: 0
Received 0 Likes
on
0 Posts
Any idiot can tweak their A/F until it stops knocking, then go a little further. To believe that Mazda engineers couldn't do that is just stupid. The point would be to maintain the same factor of safety that the car was originally designed for; y'know with math and thermodynamics, those stupid things that dumber-than-you engineers use to make sure the engine will work in the future even under a wide variety of circumstances. Not only if your engine wear, weather, place you live, etc. stay the same. Heck, look up the people have blown their engine due to knocking a long while after they tuned it.
You'd calculate how much of a safety margin there would be at 84 octane, apply the same safety margin to 87 octane, then lean it out to match the new A/F ratios. 'Course if someone realized how little there is to gain without risking their engine (in the long run), they might not want an SAFC/etc. anymore.
You'd calculate how much of a safety margin there would be at 84 octane, apply the same safety margin to 87 octane, then lean it out to match the new A/F ratios. 'Course if someone realized how little there is to gain without risking their engine (in the long run), they might not want an SAFC/etc. anymore.
Everyone that tunes their car through any means blows it up guaranteed.
/sarcasm
08-20-07, 02:34 PM
#30
Bongolio
You're right. Everyone that says the NA FC runs pig rich from the factory is completely retarded. There is no point to leaning out the mixture, as you will definitely blow your motor within a few years tops. There will be no benefit of having less carbon buildup due to the rich running condition. This won't help you have a healthy motor. There is no way that the conditions that you run your car in require less margin of error than others, and hence don't touch it.
Everyone that tunes their car through any means blows it up guaranteed.
/sarcasm
Everyone that tunes their car through any means blows it up guaranteed.
/sarcasm
I was going to say...I hope your being sarcastic!
I'm not going to get involved in this debate just for the fact that its been discussed already! Whats the point? Why is there another thread like this?
It's one thing to want to talk about it but your actually asking what's better and just because you throw hypothetically in there doesn't mean what your asking hasn't been asked 10k times already.
Basically everything you would ever want to know and more can be found and answered if you search for this subject!
Don't get upset i wont bother this thread again.
08-21-07, 06:11 AM
#31
I was going to say...I hope your being sarcastic!
I'm not going to get involved in this debate just for the fact that its been discussed already! Whats the point? Why is there another thread like this?
It's one thing to want to talk about it but your actually asking what's better and just because you throw hypothetically in there doesn't mean what your asking hasn't been asked 10k times already.
Basically everything you would ever want to know and more can be found and answered if you search for this subject!
Don't get upset i wont bother this thread again.
I'm not going to get involved in this debate just for the fact that its been discussed already! Whats the point? Why is there another thread like this?
It's one thing to want to talk about it but your actually asking what's better and just because you throw hypothetically in there doesn't mean what your asking hasn't been asked 10k times already.
Basically everything you would ever want to know and more can be found and answered if you search for this subject!
Don't get upset i wont bother this thread again.
I searched and didn't find a thread with this question. I found 500 threads asking what's the best PUMP GAS to put in. That's not my question. I already know the general consensus is that 87 is the best to put in although some have suggested higher.
It was curiosity that prompted this thread. It was never really intended to go to actual testing or anything, just plain curiosity. If you have a problem with curiosity prompting me to ask a question so I can learn something then I guess you can be content being spoon fed information and never questioning any of it.
Now... if my question has been asked (specifically) and I missed it under searching, then I would LOVE for you to link me to it. That was with absolutely no sarcasm.
To the people actually contributing to this thread, many thanks. My curiosity was somewhat satisfied. Enough for now I suppose.
Thread
Thread Starter
Forum
Replies
Last Post
Nosferatu
2nd Generation Specific (1986-1992)
7
09-05-15 02:13 PM
