100 Octane
Joined: May 2004
Posts: 3,403
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From: DFW, TX
Originally Posted by 3312DC,Feb 27 2005, 05:52 PM
PilotKD... Daytona Beach? I think you and I graduated from the same school!
If you dont mind the lead the cheapest way to get 100 octane fuel is head to the airport- Aviation Fuel "100LL" is anywhere from 2-3 bucks a gallon. Its not easy to get it as the vendors arnt aloud to dispense it into anything other than an airplane... so bring a fuel can, and say its for your airplane... Just dont ask for Jet Fuel... haha
If you dont mind the lead the cheapest way to get 100 octane fuel is head to the airport- Aviation Fuel "100LL" is anywhere from 2-3 bucks a gallon. Its not easy to get it as the vendors arnt aloud to dispense it into anything other than an airplane... so bring a fuel can, and say its for your airplane... Just dont ask for Jet Fuel... haha
The reason I believe 100LL will benifit and S2k is, how many times complain of bogging in hot weather, and other related things, anytime the engine senses knock, it will pull timing, in the case with 100oct, it is not going to knock, so...it wont pull timing, I worded myself wrong, I admit, it wont ADD anything per se, it will just stop the ECU from pulling the timing that it ALWAYS does...
Joined: Jul 2002
Posts: 19,257
Likes: 19
From: San Diego, CA
Originally Posted by Bane,Feb 24 2005, 01:48 AM
You can expect the same performance or even slightly less.
Unless your car is experiencing knock you won't feel anything.
Octane is simply a rating of the anti-knock properties of a liquid. Higher octane fuel is more resistant to exploding on it's own, and that's it. It has the same energy content as normal gasoline, and can actually show a slight power loss if your car doesn't have enough compression/boost/spark to ignite it.
Anyone that tells you they feel a difference using race gas in a stock or lightly modded car is popping placebo pills.
Unless your car is experiencing knock you won't feel anything.
Octane is simply a rating of the anti-knock properties of a liquid. Higher octane fuel is more resistant to exploding on it's own, and that's it. It has the same energy content as normal gasoline, and can actually show a slight power loss if your car doesn't have enough compression/boost/spark to ignite it.
Anyone that tells you they feel a difference using race gas in a stock or lightly modded car is popping placebo pills.
unless your engine needs it.
Registered User
Joined: Dec 2003
Posts: 2,432
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From: South Jersey
Originally Posted by 3312DC,Feb 27 2005, 07:52 PM
PilotKD... Daytona Beach? I think you and I graduated from the same school!
Registered User
Joined: Feb 2005
Posts: 8,953
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From: MD
riddle grad of spring 2002, aerosci... I had a 1st gen DSM in daytona... many kills there including a couple S2000s. my buddy went the airforce route- graduated 2nd in his class and is now on the fighter track... looking at F-15Es.... you guys get to fly the coolest equipment! I still spend a little time at an FBO and can tell you we filter and watch our fuel closely... 100LL, if you can get it is the racing fuel to get (for the money and quality)... just watch out for the CC and O2 killing lead
-PilotKD... good chance we ran into each other... maybe you where even an instructor of mine
-PilotKD... good chance we ran into each other... maybe you where even an instructor of mine
Joined: Feb 2004
Posts: 1,491
Likes: 11
From: Pensacola
My hat in the mix ...
There's a Texaco station in Oklahoma City that sells 101 octane alongside 93 (91 is the usually the highest in OKC). I've experimented with different mixtures from 100% 101 to 10% 101 mixed with 93. The best performance I measured was with 2 to 2.5 gallons of 101 mixed in per tank full (the rest 93). Above this level there were no gains - with an actual slight power loss near 75% and higher mixtures of 101. This was consistent in all temps. This puts the highest effective octane number somewhere around 96. However, the performance difference between 93 and 96 is not measurable in any practical way.
The bottom line is 101 (no lead) is great for FI cars. 100LL is definitely not worth the damage it can do to the car. The valve seats are not designed for leaded gas ... and while 100 'low lead' has a lower lead content than earlier aviation gas, it still has enough that it will do more damage than good.
There's a Texaco station in Oklahoma City that sells 101 octane alongside 93 (91 is the usually the highest in OKC). I've experimented with different mixtures from 100% 101 to 10% 101 mixed with 93. The best performance I measured was with 2 to 2.5 gallons of 101 mixed in per tank full (the rest 93). Above this level there were no gains - with an actual slight power loss near 75% and higher mixtures of 101. This was consistent in all temps. This puts the highest effective octane number somewhere around 96. However, the performance difference between 93 and 96 is not measurable in any practical way.
The bottom line is 101 (no lead) is great for FI cars. 100LL is definitely not worth the damage it can do to the car. The valve seats are not designed for leaded gas ... and while 100 'low lead' has a lower lead content than earlier aviation gas, it still has enough that it will do more damage than good.
Joined: Oct 2000
Posts: 9,033
Likes: 21
From: South of the pier, Huntington Beach, CA
I found the 100 octane added about 16 horsepower to the stock S2000 on a Dynopak Dyno. The factory ecu retards the timing some on 91 octane. All of you "don't need 100 octane" folks can just avoid the 100 octane. 
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