RE: Poping exhaust sound on rally cars.

[Mark Nelson <mnelson@brls.com>]

<<This began to appear when it was possible to have several programs for

ECU so that they could be switched at a push of one button. Untill 
recently only works rally teams could get this developed. However now 
Autotronoics, which in this country is destributed by Murry Thomas of 
TAD( the guy who maintains Henry Joy's Mitsubishi Lancer)has option of 
multiple programs. If Ivin still uses his Halltech
his car will keep popping in transit because Halltech allows only one 
program at this time. >>

The Motec M4 system on Rui Brasil's new Audi S2 does this as well.  It
might be even more exaggerated by the reground cams (using 16V GTI
profiles) in his engine that provide quite a bit of advance.

cya!
-mark nelson