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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