[s-cars] Potential reason why the "370" software causes pinging

[Joe Pizzimenti]

Solution: Increase octane.

Whether by a water/methanol injection system or the ever so addictive
blue cans of VP Racing 109 octane unleaded "C12", a little more octane
will solve your problem.  Or an FMIC.

Joe


On Tue, 28 Dec 2004 16:28:14 -0800, Dave Forgie <forgied at direct.ca> wrote:
> Over the Christmas break, I have been sorting and organizing my over 40
> Audi S1, 20V UrQ, S2, RS2, S4 and S6 20Vt magazine articles.  In doing
> so, I found one that I had not looked at too closely before:  The June
> 1994 issue of Rallye Racing has an article starting on page 50 about an
> SMS Tuning S4 Avant that was tuned to 375 PS (Deutsche Industrie Normale
> (DIN) horsepower).  The article was comparing the result to the RS2
> Avant.  (The revised top speed for the tuned S4 Avant  was 279 kph (173
> mph)).
> 
> The interesting thing was they quote the compression ratio of the tuned
> S4 as being 7.8:1 instead of the normal 9.3:1.  Since "rumour" has it
> the "370" software provided by some un-named persons is a combination of
> SMS Tuning and Lehmann tuning software, it would not surprize me that
> part of the reason the "370" software has caused my engine to ping is it
> was originally set up for the lower compression ratio.  I think the
> reason the "370" software does not always cause pinging may have
> something to do with altitude (thinner air at higher elevations
> resulting in lower air:fuel ratios and less pinging).  Since I am at sea
> level, the combo of higher than expected compression ratio and denser
> air is not good.  "Fortunately"  I have a VMAP which I have "tuned down"
> to 2.8 bar (less boost).  However,  I do want to cure this problem.  It
> may involve new software and/or FMIC.  (or a move to Denver or Calgary)
> ;>)
> 
> Dave F.
> 
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