Newbie needs explanation...

[Barry Tisdale]

Hi, everybody, my name's Barry an I'm a........new Syclone owner.  Who likes to dabble in the engine compartment.  I have a question:

The Sy has port injection, all six injectors electrically in parallel.  Where in the crank cycle are the injectors turned on?  I'm interested in when the injectors are 'maxed out', i.e., flowing all the time.  The injectors have a max 'open time' (BPW = base pulse width?) of 15msec per my scan tool, @ WOT & hi (4800) rpm.  At this rpm, a revolution of the crank takes 12.5 msec (please correct my math if wrong), but a 2 revolution power cycle takes 2x that, or 25msec. The ECM gets its rpm info from the distributor (yes? no?), getting 3 pulses per crank revolution, uses various parameters to calculate pulse width, and fires the injectors.  If I want to increase the rpm limit set into the ECM, am I not going to have to also allow for longer dwell time on the injectors?  Do I have 25 msec in which to work?

Is this clear as mud?  My last 'hot rod' was back in the old days of rejetting carbs & changing distributor curves - this computer control is *amazing* stuff to me, & I'm just really getting into it now.

Thanks for any feedback - any info greatly appreciated - Barry