high octane fuel
Ghost
Joined: Jul 2003
Posts: 8,841
Likes: 0
From: St Petersburg, FL
Re: high octane fuel
Originally Posted by VR-4ever
Hell, I enjoyed cranking the boost up for a while. Shit's expensive though.
TiM-MaY!
Joined: Nov 2002
Posts: 841
Likes: 0
From: Chesapeake/VaBeach
Re: high octane fuel
http://www.cs.uu.nl/wais/html/na-dir...faq/part3.html
go read.
go read.
6.13 Can higher octane fuels give me more power?
On modern engines with sophisticated engine management systems, the engine
can operate efficiently on fuels of a wider range of octane rating, but there
remains an optimum octane for the engine under specific driving conditions.
Older cars without such systems are more restricted in their choice of fuel,
as the engine can not automatically adjust to accommodate lower octane fuel.
Because knock is so destructive, owners of older cars must use fuel that will
not knock under the most demanding conditions they encounter, and must
continue to use that fuel, even if they only occasionally require the octane.
If you are already using the proper octane fuel, you will not obtain more
power from higher octane fuels. The engine will be already operating at
optimum settings, and a higher octane should have no effect on the management
system. Your driveability and fuel economy will remain the same. The higher
octane fuel costs more, so you are just throwing money away. If you are
already using a fuel with an octane rating slightly below the optimum, then
using a higher octane fuel will cause the engine management system to move to
the optimum settings, possibly resulting in both increased power and improved
fuel economy. You may be able to change octanes between seasons ( reduce
octane in winter ) to obtain the most cost-effective fuel without loss of
driveability.
Once you have identified the fuel that keeps the engine at optimum settings,
there is no advantage in moving to an even higher octane fuel. The
manufacturer's recommendation is conservative, so you may be able to
carefully reduce the fuel octane. The penalty for getting it badly wrong,
and not realising that you have, could be expensive engine damage.
On modern engines with sophisticated engine management systems, the engine
can operate efficiently on fuels of a wider range of octane rating, but there
remains an optimum octane for the engine under specific driving conditions.
Older cars without such systems are more restricted in their choice of fuel,
as the engine can not automatically adjust to accommodate lower octane fuel.
Because knock is so destructive, owners of older cars must use fuel that will
not knock under the most demanding conditions they encounter, and must
continue to use that fuel, even if they only occasionally require the octane.
If you are already using the proper octane fuel, you will not obtain more
power from higher octane fuels. The engine will be already operating at
optimum settings, and a higher octane should have no effect on the management
system. Your driveability and fuel economy will remain the same. The higher
octane fuel costs more, so you are just throwing money away. If you are
already using a fuel with an octane rating slightly below the optimum, then
using a higher octane fuel will cause the engine management system to move to
the optimum settings, possibly resulting in both increased power and improved
fuel economy. You may be able to change octanes between seasons ( reduce
octane in winter ) to obtain the most cost-effective fuel without loss of
driveability.
Once you have identified the fuel that keeps the engine at optimum settings,
there is no advantage in moving to an even higher octane fuel. The
manufacturer's recommendation is conservative, so you may be able to
carefully reduce the fuel octane. The penalty for getting it badly wrong,
and not realising that you have, could be expensive engine damage.
Last edited by coolva; Aug 22, 2004 at 09:57 PM.
Registered Member
Joined: Dec 2002
Posts: 729
Likes: 0
From: dc
Re: high octane fuel
Originally Posted by MerF
So joe bob's Civic, with a mad whopping 8.8:1 c/r can use 100 octane? I don't think so. Your run of the mill 1.6L SOHC can run on 85 octane without pulling timing, in what way would 100 octane do anything but NOT burn?
I can tell you this, in my car I mixed C16 with 93, with a ratio that put it in the neighborhood of 102-104 octane. I lost MAJOR power on my low boost settings. Car ran like complete ass until I went to the higher boosts where I was compressing the fuel enough for it to burn completely and efficiently. And that's on a medium size turbo Supra...imagine the results in a n/a Honda.
I can tell you this, in my car I mixed C16 with 93, with a ratio that put it in the neighborhood of 102-104 octane. I lost MAJOR power on my low boost settings. Car ran like complete ass until I went to the higher boosts where I was compressing the fuel enough for it to burn completely and efficiently. And that's on a medium size turbo Supra...imagine the results in a n/a Honda.
where is your point?
i didnt know on a car forum where 80% of the people mod their vehicles, joe bob has a "normal" civic.
Ghost
Joined: Jul 2003
Posts: 8,841
Likes: 0
From: St Petersburg, FL
Re: high octane fuel
Originally Posted by DeepFreeze
youre making the asumption any of us are running STOCK run-of-the-mill cars...
where is your point?
where is your point?
i didnt know on a car forum where 80% of the people mod their vehicles, joe bob has a "normal" civic.
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