Yes, the point where the injectors stage is by far the hardest to program.
Everywhere else it is so simple that it leaves you unprepared to deal with
that one spot.  I'll have to give this subject some more thought and see
what I can do to make it easier.  Being able to move the stagging point (on
the EC2) allows you to move it to a place where it isn't so sensitive but
doesn't completely eliminate this.

Tracy Crook
tcrook@rotaryaviation.com
www.rotaryaviation.com

  As Paul said previously, it doesnt sound like there is any hysteresis
programmed at the staging point. Can this be added?

  I had one of the early Holley Pro-jection systems on a 383 Chevy about 10
years ago. The car was a light Datsun 260Z with auto trans and a fairly hot
cam with low idle vacuum. Any time I put the car in gear, idle RPM would
drop a little (due to torque converter stall speed), mp would change, the
controller would adjust mixture, idle  would surge, etc... This oscillation
would get increasingly worse until idle dipped low enough that the engine
would die. Some sort of hysteresis would have prevented this oscillation.
Holley's tech support ultimately told me that there was nothing they could
do to help and recommended that I replace the cam, or torque converter, or
both. Fortunately I bought the Pro-jection from Summit Racing who has very
good customer support (unlike Holley at the time) and they took the
Pro-jection back. I know that at some later point the Pro-jection systems
came out with a revised controller with better programming but dont know if
this problem was ever addressed.

Mike Wills

 
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