Engine Control Question

[Greg Hermann]

>I have been monitoring my engine with diacom and have found out a few things
>about it..  One of which leaves me wondering why...
>
>Here are the details
>91 Sunbird
>3.1L V6 Engine
>Automatic, 2.53 Axle
>
>When speeding up from a dead stop at WOT, the fuel injector pulse width is
>around 12.2ms.  Once it goes above 3700 rpm or so, it starts to slowly
>decline until it hits 5200 (right before shifting).  At 5200 rpm the pulse
>width is 9.8ms.  Why would this be?  Is this so the engine doesn't melt :),
>or for emissions reasons.  If this stayed at 12.2ms right to the shiftpoint,
>would this generate more power?

Nope, it is doing what it is supposed to do. The pulse width is a maximum
at the TORQUE peak, then drops off.

Greg
>
>Also, this thing has the 730 ECM.  How many frames per second on this baby?
>(I asked this before, but now know exactly what to specify :)  Has anyone
>found out anything about the MEMCALs for this ECM?  I have the eeprom loaded
>in if anyone wants to take a look..
>
>Thanks,
>Scott