Forgot to add...
Easy explanation - Higher Octane Fuel burns slower therefore requiring
the "spark" to ignite the air/fuel mixture at a quicker (or sooner)
rate. If you advance the timing, you can accomplish this.
Example:
87 Octane = 12 Degrees BTDC
91 Octane = 14 Degrees BTDC (Ignition occurs sooner to accommodate for
the slightly longer burn rate of the higher octane fuel - makes a few
more ponies as well if it occurs at the correct time)
Now in response to the 100 octane race fuel making a vehicle run
faster....it's quite possible but you need to remember that race fuel
isn't pump gas with a can of "104" octane booster. The blend is quite
different and, in most cases, a lot "cleaner" than pump fuel.
- Bernd
-----Original Message-----
From: owner-dakota-truck@bent.twistedbits.net
[mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of Bernd D.
Ratsch
Sent: Thursday, May 29, 2003 5:32 AM
To: dakota-truck@dakota-truck.net
Subject: RE: DML: Re: RE: Re: Superchips Dyno Results
Sorry to say Gary, but simple changes in Ignition Timing can require the
use of higher octane fuel. It's an old trick as well - change initial
and overall timing curve (recurving a distributor) and grab the next
higher grade of fuel (did this on my old '69 AMC). Works wonders. :)
Compression is just one of the factors. You can run a 10:1 engine on
pump gas with the correct timing curve.
- Bernd
-----Original Message-----
From: owner-dakota-truck@bent.twistedbits.net
[mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of Gary
Hedlin
Sent: Wednesday, May 28, 2003 11:07 PM
To: dakota-truck-moderator@bent.twistedbits.net
Subject: Re: DML: Re: RE: Re: Superchips Dyno Results
Sorry to bust everyones bubble, but theres NO WAY pcm programming alone
can allow a vehicle to use premium fuel efficiently. Yes it can be set
in the PCM, but the stock compression ratio works the best with 87. So
unless you've done work on the heads and pistons, you cannot increase
the compression ratio, or run premium fuel efficiently. Not even having
a bigger TB will help, just increase the ammount of fuel needed.
-- Gary Hedlin
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