What Octane level U guys use

KingFisher · Post by **KingFisher** » August 28th, 2001, 2:48 pm

What's up guys... Just a question as to what level of Octane you all use. I use a higher one which is usually only 91-4 , so what do you all use. Any added fluids, octane boost, Nitros boost(I would never) .

later...

DiGiTaL · Post by **DiGiTaL** » August 28th, 2001, 3:18 pm

I use 89 octane and I have a GS.I won't start using 92 until I get my engine swap.[This message has been edited by DiGiTaL (edited August 28, 2001).]

David Coleman · Post by **David Coleman** » August 28th, 2001, 3:30 pm

87 octane. For the track I use 89 and reset my computer though.------------------ David Coleman- Moderator <A HREF="http://www.PinkMX-3.com" TARGET=_blank>1993 Mazda MX-3 GS Special Edition</A> <A HREF="http://www.highlandsun.com/hyc/sae920677/" TARGET=_blank>V6 engine info</A> | <A HREF="http://www.bradbury.cwc.net/probemx/index.htm" TARGET=_blank>KL FAQ</A> | <A HREF="http://www.brownsword.ca/Probe.html" TARGET=_blank>ECU reprogramming</A> | <A HREF="http://members.home.net/tekguy/" TARGET=_blank>K series Image cache</A> | <A HREF="http://archive.probetalk.com/cgi-bin/se ... tion=intro" TARGET=_blank>Probetalk Archive Search</A>

Bri94GS · Post by **Bri94GS** » August 28th, 2001, 4:07 pm

I used to run my car on 89, but since i started using 93, it runs a lot better, and the gas seems to last a little longer. ------------------ ~'94 GS (Creek Blue Mica)

Guest · Post by **Guest** » August 28th, 2001, 5:31 pm

I try to use 91 if I can find it but usually only find 89. I use Quick trip gas only. I dont know where else they are located but they are on everywhere here. With 87 I here pings and when you try to accellerate I really here the pings and less power.

white fish · Post by **white fish** » August 28th, 2001, 7:50 pm

You are to use the octane that reflects your compression ratio for example a engine with 9.1:1 needs 91 octane------------------ Clear White 2.5L GSR

David Coleman · Post by **David Coleman** » August 28th, 2001, 11:08 pm

<BLOCKQUOTE>quote:<HR>Originally posted by white fish: You are to use the octane that reflects your compression ratio for example a engine with 9.1:1 needs 91 octane<HR></BLOCKQUOTE> That is 117% false.I know guys who use 93 octane on 12:1 motors, and guys who have to use 93 octane and octane booster on 9.5:1 motors. It depends on many factors, including squish area of course. Read <A HREF="http://www.seansa4page.com/resource/octane.html" TARGET=_blank>this primer on gasoline and octane ratings.</A>------------------ David Coleman- Moderator <A HREF="http://www.PinkMX-3.com" TARGET=_blank>1993 Mazda MX-3 GS Special Edition</A> <A HREF="http://www.highlandsun.com/hyc/sae920677/" TARGET=_blank>V6 engine info</A> | <A HREF="http://www.bradbury.cwc.net/probemx/index.htm" TARGET=_blank>KL FAQ</A> | <A HREF="http://www.brownsword.ca/Probe.html" TARGET=_blank>ECU reprogramming</A> | <A HREF="http://members.home.net/tekguy/" TARGET=_blank>K series Image cache</A> | <A HREF="http://archive.probetalk.com/cgi-bin/se ... tion=intro" TARGET=_blank>Probetalk Archive Search</A>

white fish · Post by **white fish** » August 29th, 2001, 12:17 am

117% lolI tried to under stand it but could you explian what they mean in 7.1 on the page you gave?ps. did you test your 2inch intake vs your 3inch for incresed air speed how did it work out??------------------ Clear White 2.5L GSR

David Coleman · Post by **David Coleman** » August 29th, 2001, 11:26 am

7.1 is a list of recommended octane levels for carburated engines with no engine management systems. Also, its likely assuming 2 valve cast iron heads, which arent the best design for high compression on pump gas...Vaughn dyno'd [Vericom 2000] the best results from 89 octane on his 9.6:1 compression KLD with KL IHI heads. I've gotten my best ET's with 89 octane. If you use too high of an octane, it will be harder to burn, make less power, and make your car slower.------------------ David Coleman- Moderator <A HREF="http://www.PinkMX-3.com" TARGET=_blank>1993 Mazda MX-3 GS Special Edition</A> <A HREF="http://www.highlandsun.com/hyc/sae920677/" TARGET=_blank>V6 engine info</A> | <A HREF="http://www.bradbury.cwc.net/probemx/index.htm" TARGET=_blank>KL FAQ</A> | <A HREF="http://www.brownsword.ca/Probe.html" TARGET=_blank>ECU reprogramming</A> | <A HREF="http://members.home.net/tekguy/" TARGET=_blank>K series Image cache</A> | <A HREF="http://archive.probetalk.com/cgi-bin/se ... tion=intro" TARGET=_blank>Probetalk Archive Search</A>

Esper · Post by **Esper** » September 15th, 2001, 3:50 am

I've actually tried using Chevron's gas with "techron" and it actually runs better..try it for a few tanks and see if that helps, regardless of octane.

fender bent · Post by **fender bent** » September 17th, 2001, 1:11 am

<BLOCKQUOTE>quote:<HR>Originally posted by Esper: I've actually tried using Chevron's gas with "techron" and it actually runs better..try it for a few tanks and see if that helps, regardless of octane.<HR></BLOCKQUOTE>that is one of the absolute worst things you can do for your engine. it was not designed to used techron. do NOT use it.

pelado · Post by **pelado** » September 18th, 2001, 12:48 am

Hey dude! What manufacturer DID design their engines to "run" with Techron? This is a rhetorical question of course, since none did...unless you have some inside info that you'd like to share with us about the evils of Techron and engine design.

mazdamaniac · Post by **mazdamaniac** » September 21st, 2001, 1:07 am

<BLOCKQUOTE>quote:<HR>Originally posted by fender bent: that is one of the absolute worst things you can do for your engine. it was not designed to used techron. do NOT use it.<HR></BLOCKQUOTE> Uh, "Techron" is just the additive pachage Chevron puts in their gas. As far as additive packages go, theirs is pretty good. Almost ALL of the gasoline sold in North America comes out of the same refineries so the additive package is the only real difference between brands.As far as octane goes, use the lowest octane rating that doesnt ping. High octane = lower power potential. The lower the octane, the more volatile the fuel is and the more power it will make. Octane is just used to rate resistance to pre-ignition. If you are running boost or otherwise leaning your mixtures, you may need higher octane to counter the likelyhood to ping. I have done a lot of tests with my car at 11 PSI of boost and I find the knock resistance to be very temperature dependant. On the warmest days, I use 93 octane. But in the winter, I can run on 89 just fine. I whimsical test with 105 or so race gas produced no perceptable change in performance.The stock GS motor was designed (in the North American market) to run on 87 octane at the minimum. This was the typical "average" gas available in 1989 when the MX-3 was designed. Anyone still see 84 octane these days? My local Sunoco has 94 most days and another up in Frederick Maryland has 97! Expensive stuff with no real purpose in a typical street car.

shawnm · Post by **shawnm** » September 21st, 2001, 2:07 pm

I normally use 98 octane, sometimes 99+ from the Shell gas station,and very rarely 95 (thats the worst u can get here

)cyashawn yet without mx-3 1.8 v6 but u could see the last pics on : <A HREF="http://tuning.hoga.pl" TARGET=_blank>http://tuning.hoga.pl</A>

Pallor · Post by **Pallor** » September 21st, 2001, 7:07 pm

<BLOCKQUOTE>quote:<HR>Originally posted by mazdamaniac: The stock GS motor was designed (in the North American market) to run on 87 octane at the minimum.... My local Sunoco has 94 most days and another up in Frederick Maryland has 97! Expensive stuff with no real purpose in a typical street car.<HR></BLOCKQUOTE>My 1993 GS SE absolutely drags if I put in anything under 93 octane. I mean its like I was accelerating with the air conditioner on when I use 87 in a pinch. Ive seen the 97 octane one when I go visit my grandmother in Hagerstown, MD. I didnt notice that much difference when I used 97 to 93 as opposed to the huge difference in 93 to 87.- Meg

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What Octane level U guys use

What Octane level U guys use

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