89 octane vs. 104 or 110 octane

Nitrous Al · 03-02-2002, 10:32 PM

I recently found out the low 11 second "Pure Street" cars run on 110 octane gasoline. How much more power could I expect if I "set up" my Mustang to run on a higher octane gasoline like 104 or 110?

gtsr515 · 03-02-2002, 10:57 PM

Those cars your looking at (maybe mine?) are surely running a bit more compression. A stock stang is 9.0:1, mine is roughly 10.75:1.

If you are stock, 93 is the best you can pump, very high octane is for higher compression motors, or power adders cars.

Honestly, in my street stang, I run the cheap 87, and am still spankin' high end chevy's, etc.

High octane burns slower, thus, smoother, lower octane burns quick, BANG, thus, actually, theoretically, quicker.

I am on my 9th Miller Lite though.........

Coupe5oh · 03-03-2002, 02:26 AM

What a coincedence, im about on my 6th miller lite, what were we talking about? oh yea, octane, i run a little vp 99 just to be safe from detonation, being my timing is at 16*in, but 93 never fails me, and i remember my fastest timeslip on street tires was ran on 87 octane.

timing was at 12-14

PKRWUD · 03-05-2002, 10:12 PM

Al-
Octane equals burn rate. The lower the octane, the faster the burn rate. For performance, you want the quickest burn rate you can use without detonation. In otherwords, the lowest octane you can use without detonation is the best to use. Using a fuel with a higher octane rating than you need will actually slow the vehicle down. Mods that cause detonation, therefore, require higher octane. Advanced timing and increased compression are the two most common mods that create detonation. While advancing the timing will help a little bit with performance, increasing the compression will help alot. If you have 110 octane fuel at your disposal, 13:1 compression is easily attainable, and 14:1 isn't out of reach. Compression this high will greatly increase performance, but will hinder drivability. Also, keep in mind that once you install high compression pistons, you ALWAYS have to run high octane fuel.

Take care,
-Chris

03-02-2002, 10:32 PM	#1
Nitrous Al Registered Member Join Date: May 2000 Location: Everett, MA Posts: 417	89 octane vs. 104 or 110 octane I recently found out the low 11 second "Pure Street" cars run on 110 octane gasoline. How much more power could I expect if I "set up" my Mustang to run on a higher octane gasoline like 104 or 110?

03-02-2002, 10:57 PM	#2
gtsr515 Registered Member Join Date: Nov 2001 Location: Sunny, Hot, Sebring, Florida Posts: 725	Those cars your looking at (maybe mine?) are surely running a bit more compression. A stock stang is 9.0:1, mine is roughly 10.75:1. If you are stock, 93 is the best you can pump, very high octane is for higher compression motors, or power adders cars. Honestly, in my street stang, I run the cheap 87, and am still spankin' high end chevy's, etc. High octane burns slower, thus, smoother, lower octane burns quick, BANG, thus, actually, theoretically, quicker. I am on my 9th Miller Lite though......... __________________ Remember...2nd place is 1st place for losers!

03-03-2002, 02:26 AM	#3
Coupe5oh Registered Member Join Date: Nov 2001 Location: SanAntonio, Tx Posts: 734	What a coincedence, im about on my 6th miller lite, what were we talking about? oh yea, octane, i run a little vp 99 just to be safe from detonation, being my timing is at 16*in, but 93 never fails me, and i remember my fastest timeslip on street tires was ran on 87 octane. timing was at 12-14 __________________ Police package 5spd 90 Lx, Stock original motor, 3.27grs, BM fan, fms 10.5 clutch, D&D quadrant, and adjuster, ADS chip, 180 stat, mac cai, mac h-pipe, mac subframe connectors, ASP crank pulley, ripper shifter, 26x10.5 M/T sport pros welds. 246 hp according to analyzer Race weight: 3,120 E.t-13.57 with 26x10.50's e.t. streets. 1.88 60' mph- 99.92 mph

03-05-2002, 10:12 PM	#4
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	Al- Octane equals burn rate. The lower the octane, the faster the burn rate. For performance, you want the quickest burn rate you can use without detonation. In otherwords, the lowest octane you can use without detonation is the best to use. Using a fuel with a higher octane rating than you need will actually slow the vehicle down. Mods that cause detonation, therefore, require higher octane. Advanced timing and increased compression are the two most common mods that create detonation. While advancing the timing will help a little bit with performance, increasing the compression will help alot. If you have 110 octane fuel at your disposal, 13:1 compression is easily attainable, and 14:1 isn't out of reach. Compression this high will greatly increase performance, but will hinder drivability. Also, keep in mind that once you install high compression pistons, you ALWAYS have to run high octane fuel. Take care, -Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

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