[s-cars] Octane and Unleaded Race Gas Article

[Joseph Pizzimenti]

How about a simple aquamist on the outside of the
intercooler?  Shouldn't cost too much and should keep
you out of detonation.

-Joe
--- Rob Pecsar <rpecsar at pacbell.net> wrote:
> Igor and Joe,
>
> You are right, we don't anything better than 91
> octane in California at
> commerical outlets. I ruled everything else out that
> I could as the
> source of pinging - plugs, fuel filter, basic engine
> diagnostics. All
> checked out fine. So I added 5 gallons of Union 76
> 100 octane race fuel
> to my normal 91, putting me at ~93 octane. Result is
> zero pinging.
>
> Next step is when the tank is half full, I'll top it
> off 91 in order to
> test out 92 octane. At $6.00/gallon its not the
> cheapest solution, but
> at least I can finally feel the result of the MTM
> upgrade without
> damaging the motor.
>
> Do you think an intercooler cleaning will reduce the
> pinging? RS-2 E.M.?
> I guess anything to drop the combustion temp will
> help. Seems like
> alcohol injection may be the cost effective way to
> control pinging while
> maintaining the advanced timing that I paid for with
> the MTM
> upgrade...my old TAP setup doesn't seem so bad in
> hindsight.
>
> Rob Pecsar
> 92 S4
>
> Igor Kessel wrote:
>
> > Rob Pecsar wrote:
> >
> > > 92 S4 MTM 1+ with no ping on 93 octane in
> California
> >
> > Bob,
> > I didn't know you had anything above 91 in
> California?
> >
> > And what's the deal with "no ping" anyway? Water
> injection? Toluene?
> >
> > --
> > Igor Kessel
> > two turbo quattros
> >
> > 97 S6 MTM 1+ pinging away on 93 octane in
> Pennsylvania
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>
>
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