Using OEM (GM) ECM

[John Hess]

Mark,

I haven't heard from you in a while.  I have the Master Tune for the '89
Automatic on order.  I have some more information on the system that is
not available with the Mastertune, like idle speed for '86 through '89.
I think you were the one who gave me the '89 locations.  I wrote a short
program to set these.  As soon as I can correlate some more data (like
temp thresholds), I will add this information and send this out.  I
would be interested in trading copies of the MasterTune when mine
arrives.

> ----------
> From: 	Mark Romans[SMTP:romans at pacbell.net]
> Sent: 	Friday, September 26, 1997 12:58 AM
> To: 	diy_efi at coulomb.eng.ohio-state.edu
> Subject: 	Using OEM (GM) ECM
> 
> Tom,
> 
> Standard Master Tune allows you to reset fuel cutoff mph and resume
> mph,
> same for rpm.  2 cooling fans (If originally so equipped). VATS enable
> or disable. VATS diagnostic, Knock diagnostic, vehicle speed
> diagnostic(That's page one).
> WOT spark map. (In my case rpm's on one side and gm/sec from maf on
> other)
> Max knock retard in WOT (Based on signal from knock sensor).
> WOT %chg to afr vs rpm
> WOT %TPS to enable WOT vs rpm  (% throttle to go to open loop)
> WOT %chg to AFR vs coolant temp
> open loop afr %chg vs coolant temp
> open loop AFR %chg vs load value (grams/sec)
> 
> It will work on any 165 ecm.  87-88 f,y bodies.  MT pro ads a bunch
> more
> things that can be modified, you can calibrate your maf sensor, reset
> idle speed, modify(I understand operation of the egr)  turn off codes,
> like when you put headers on the negative back pressure egr will turn
> on
> the check engine light, you can kill that. I don't know what else is
> available with the pro series.  But the PRO (Which I don't have) will
> allow you to do 87-93 f&y bodies, and 85-95 trucks.  The pro series is
> $2500.00 and the single application is $295.00.   I have just the
> single
> application.    Mark.
>