Stop guessing at facts.

[John Dammeyer]

Hi Phil,

I found Scotts comments quite good!

>Phil
>Injec Racing Developments
>
>And just a hint to John. The limiting factor is your first choice of
>max pw
>at 12.8 and second 7000 rpm has a max pw of 7.57ms.


I'm not sure that I understand what you mean about limiting factor but an engine
cycle is 720 degrees and therefore, at 7000RPM,  with an 80% duty cycle the max
pw is 13.7ms.  By limiting my pulse width to less than 75% I just needed
slightly larger injectors.  By using Lucas injectors, with a shorter open time,
I can use a short pulse width at idle and still keep the engine ticking over
smoothly.

BTW,  theory finally caught up with real life after I discovered a software
glitch in the ignition timing that had my advance at 65 degrees at high RPM.
(oops).  Now I (properly) limit advance on this engine to 34 degrees and maximum
advance is in at 4000.  VTEC solenoid comes on at 3700RPm and we are achieving
134HP at 6700RPM.   Suddenly my Volumetric Efficiency table matches theory and
tuning the engine has become far more fun.

Regards,

John

I also agree that the Internet can be a source of mis-information and if
everything was considered to be the truth some would end up believing that an
ambient (barometric) pressure sensor isn't necessary. ;-)