RE: fun with c16

["Joe Doty" <rocco2nr@hotmail.com>]

Yes, I am well aware of these facts.  My 16v does indeed have a knock 
sensor.  I suspect that the pinging came from bad gas, as I don't normally 
get pinging with Chevron 91.

>Joe-
>Aaron has touched on some basic truths: unless you have a
>knock-sensor-equiped car, fuel of higher or lower octane will not change 
>its
>power output WITHOUT YOU CHANGING THE IGNITION TIMING FIRST, either to
>utilize the higher octane or to let it run lower octane without detonation.
>(not pre-ignition or "predetonation", which is a non-word)
>
>Larry  sandiego16V
>
>-----Original Message-----
>From: Aaron Ness [mailto:aaron@makuta.com]
>Sent: Thursday, October 25, 2001 10:57 AM
>To: 'Joe Doty'; scirocco-l@scirocco.org
>Subject: RE: fun with c16
>
>
>I'm not trying to piss on your party, but I might do that.
>
>When I was in school, one of the ME labs consisted of a measurement project
>of our own choosing.  They put some restrictions on it, though - we had a
>Superflow dyno and a 350, a F*&d 4-banger, and a Dodge truck V10 at our
>disposal, and they said we couldn't test the effects of octane or Splitfire
>plugs.  These had both been done many times in previous classes, and nobody
>was able to realize a statistically significant difference in either case.
>(My group ended up running the 350 with cooling water at 190 and 160 
>degrees
>F and got a 1-2 hp gain.)
>
>Is your timing advanced too far, causing the pinging?  That would
>potentially result in more power when you move to something with higher
>octane that is less likely to predetonate.  If the timing is set the same
>and you don't have pinging, see if there is a measurable difference.  
>(Since
>the placebo effect comes into play, the butt dyno isn't accurate enough for
>this one.)
>
>Aaron
>'87 528e
>'82 Scirocco
>'70 Beetle
>'82 GPz550
>
>
>-----Original Message-----
>From: owner-scirocco-l@scirocco.org
>[mailto:owner-scirocco-l@scirocco.org]On Behalf Of Joe Doty
>Sent: Thursday, October 25, 2001 12:16 PM
>To: scirocco-l@scirocco.org
>Subject: fun with c16
>
>
>Yeah, I went and bought some 116 octane gas a while back just to see if it
>would make any difference on my 2.0 16v.  It was like $40 for 5 gallons.  I
>never ended up using it until today...after the normal fillup with Chevron
>91 octane I was getting some crazy pinging under load.  So I figured I 
>would
>see what happened when I dumped a gallon of that stuff in there.  There was
>only like 5 gallons of regular gas in there.  And man oh man, what a
>difference!  When ambient temps are lower (55-60 deg), it pulls like mad!
>The difference is less at higher temps but definitely still there.  Part
>throttle in 2nd and 3rd OWNZ.
>
>Joe
>
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