Simple Injection Questions

[ECMnut at aol.com]

Hi Frederic,
 I gotta agree.  The GMC Syclone has a 4600 RPM fuel cut from the
factory.  When ya hit it, it bucks like a bull, as fuel is turned off, then
back on, and there is definitely detonation when this occurs under
boost.  I've heard all the theories about turning the fuel off <cleanly>
then back on, but they don't seem to apply with 16psi of boost..  
There is *significant* detonation as the injectors come back on..
 It's not pretty.  It would be good if they'd kill both spark & fuel
Mike V

>  It would be my preference to cut spark rather than fuel, simply
>  because cutting fuel would result in a lean condition at higher RPMs
>  and possibly cause detonation.  No spark results in fuel cooling off
>  the combustion chamber while you're above the RPM limit, but I know
>  there are other factors (unburnt fuel into the cats, etc).