Cooling fan Operation

[Bruce Plecan]

-----Original Message-----
From: Roger Heflin <rah at horizon.hit.net>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Wednesday, August 12, 1998 11:47 PM
Subject: Re: Cooling fan Operation


>
>Bruce,
>
<snip>
>
>Which ecm and in what car are you looking at?

165/730

  I have read out my proms
>for my 93 Z28.  From the diffs I have determined where some of the Open
>to closed loop throttle positions values are.  I have worked out the
>formats (value/256) is the percent, and the numbers seem to match what the
>tuner told me the original settings were and what he changed them to.  The
>part that I cannot really figure out is that there are several numbers in
>a row representing values at different rpms.  Does anyone know what rpms
>the ECM's generally start at? and what the step size is, and where it
>ends?

Can be less than 400, and steps of 100-200-400-800, and I think
I've seen some as high as 5600.  So anywhere might be the answer,
when speaking in general.  I can't comment specificially on the 93+
since I ain't got there yet.
>
> Roger
>