Grin well taken. The difference is slight enough, I'm not sure it would show
up in a 0-60 run or a 1/4 mile time, let alone on an autocross where one is
traction limited most of the time. The official word from Joey McBride at
Panoz was that 91 octane will not make a significant difference in
performance. His only concern was the fact that fuel oxygenates have a
corrosive effect on aluminum (engine and fuel tank are both aluminum in that
car). I did feel _some_ improvement, but knowing placebo effects (and the
fact that last evening near sundown was pretty cool = dense air charge) I
can't bet my life on it. Experimenting was fun and educational but I'll
stick to 91 octane for now.
-- MRC
-----Original Message-----
From: owner-ba-autox@autox.team.net
[mailto:owner-ba-autox@autox.team.net]On Behalf Of James Creasy
Sent: Friday, August 24, 2001 11:57
To: mrclem@telocity.com; Steve Kupper; Autocross; John J. Stimson-III;
Jerry Mouton
Subject: Re: octane boost
> from 92 to 91 octane causes a slight decrease in power that becomes
noticeable
> under extreme acceleration.
i will plan to drop the right foot a little sooner then this sunday. =)
-james c
OSP #74
----- Original Message -----
From: Michael R. Clements <mrclem@telocity.com>
To: Michael R. Clements <mrclem@telocity.com>; Steve Kupper
<skupper@2xtreme.net>; Autocross <ba-autox@autox.team.net>; John J.
Stimson-III <john@idsfa.net>; Jerry Mouton <jerry@moutons.org>
Sent: Friday, August 24, 2001 7:17 AM
Subject: RE: octane boost
> I filled up with 100 octane race gas at the Union 76 yesterday. The car's
11
> gallon tank took 7.5 gallons. The gas didn't seem to make any difference,
> until I opened up the throttle and let the engine rev as I entered Hwy
280. At
> wide open throttle the engine pulls a bit harder from 3k to 6k RPM. Not a
huge
> difference, but enough to feel.
>
> This 100 octane stuff is probably overkill, but it does indicate that the
drop
> from 92 to 91 octane causes a slight decrease in power that becomes
noticeable
> under extreme acceleration.
>
> Thanks for all the info,
>
> P.S. I found the following link with detailed info on RON, MON and other
> things Octane:
> http://www.seansa4page.com/resource/octane.html
>
> -----Original Message-----
> From: owner-ba-autox@autox.team.net
> [mailto:owner-ba-autox@autox.team.net]On Behalf Of Michael R. Clements
> Sent: Wednesday, August 22, 2001 15:28
> To: Steve Kupper; Autocross
> Subject: RE: octane boost
>
>
> True, but our cars are no longer getting 92 octane. So upping it back to
92
> could have some benefits. That's what I intend to find out.
>
> -----Original Message-----
> From: owner-ba-autox@autox.team.net
> [mailto:owner-ba-autox@autox.team.net]On Behalf Of Steve Kupper
> Sent: Wednesday, August 22, 2001 14:54
> To: Autocross
> Subject: RE: octane boost
>
>
> I don't know about the computer on other cars, but on BMWs OBD II does not
> recognize octane level higher then 92, thus you will see no performance
> increase unless you change the software.
>
> steve
> -----Original Message-----
> From: owner-ba-autox@autox.team.net
> [mailto:owner-ba-autox@autox.team.net]On Behalf Of Michael R. Clements
> Sent: Wednesday, August 22, 2001 2:03 PM
> To: Jerry Mouton; Autocross
> Subject: RE: octane boost
>
>
> Jerry,
>
> Thanks for the info, sounds like race fuel at the pump is the more
effective
> solution.
>
> The engine is not knocking, yet I fear that since it's designed for 92
> octane,
> the engine's OBD II system is retarding the timing to avoid knocking, so
I'm
> losing power. The engine computer is supposedly designed to constantly
> advance
> the timing just shy of knocking, so theoretically it should respond to
> higher
> octane fuel. I want to try the higher octane stuff so see if I can feel
the
> difference in the seat of my pants. I figure it's worth at least one tank
of
> the stuff, even if doesn't make any difference, just to satisfy my
> curiousity.
>
> -----Original Message-----
> From: Jerry Mouton [mailto:jerry@moutons.org]
> Sent: Wednesday, August 22, 2001 13:45
> To: mrclem@telocity.com; Autocross
> Subject: Re: octane boost
>
>
> Michael,
>
> If your engine is not knocking, getting higher octane gas won't
> help you a bit. There is no additional energy or performance in
> higher octane fuel. It just has a slower burning characteristic
> that avoids preignition -- knock. My '64 Jaguar knocks a lot
> with pump gas, so I have a neverending quest for octane.
>
> If you are getting preignition,
>
> 1. It's at Almaden and Foxworthy, near I87. The pump octane
> is 100, which means it has a research octane rating of 106,
> higher than the 100 research octane that used to be premium.
> The Jag does not knock a bit with this fuel.
>
> 2. 104+ is the most effective additive, the others don't have much
> effect. 104+ doesn't have very much effect, either. It kept
> knock down to a minimum with the old 92 pump octane fuel, I have
> not tried it yet with the 91 octane available now.
>
> Jerry
>
> Jerry Mouton mailto:jerry@moutons.org Laissez les bons temps
> rouler!
>
> ----- Original Message -----
> From: "Michael R. Clements" <mrclem@telocity.com>
> To: "Autocross" <ba-autox@autox.team.net>
> Sent: Wednesday, August 22, 2001 12:56 PM
> Subject: octane boost
>
>
> > Hi everyone,
> >
> > Based on the thread a little while back regarding 91 octane gas, I'm
> wanting to ensure that I'm getting every last erg of output from my
> not-so-large high revving V8 engine. So I'm wondering what are the options
> for getting real American true blue 92 octane or higher gasoline.
> >
> > Option 1: go to that gas station somewhere in the south bay (forgot
where
> it is) that supposedly sells 100 octane gas.
> >
> > Option 2: use a fuel additive to increase the octane of the gas in the
> tank.
> >
> > Regarding option 1, just where is that gas station and what is the
octane
> of the gas it's selling?
> >
> > Regarding option 2, are there any products out there that actually do
> raise the octane of the gas without causing side effects or damaging the
> engine?
> >
> > Are there other options?
> >
> > I tried searching the web and found a few links like this:
> http://www.goldeagle.com/cartips/octimpr1.htm but can't really tell if
these
> are "real".
> >
> > Thanks,
> >
> > Michael R. Clements
> > mrclem@telocity.com
> > Some find truth in beauty, others find beauty in truth.
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