Re: Re: RE: Re: Superchips Dyno Results

From: Gary Hedlin (ghedlin@theramp.net)
Date: Thu May 29 2003 - 17:41:20 EDT


Yeah, but I would hardly call 91 a premium fuel. I was meaning the 104
race fuels.

I guess the whole compression ratio wasnt explained to me quite right. I
was under the impression it depended on the combustion chamber only.

--
Gary Hedlin
President
Hedlin Web Designs
http://www.hedlin.net
""Bernd D. Ratsch"" <bernd@texas.net> wrote in message
news:000001c325d9$329ce5a0$090aa8c0@homenet.com...
>
> 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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