When asking ecm questions

[Tom Sharpe]

Off list

Scott, I am very inteesting in seeing your Auto learn code.  I am also
interested in developing software that is self tuning, or oto calibrating a
SD system with a temporary MAF.

Muine has too much cam for a standard table, but I think o could write a pgm
to build a good table for it.  --- more lated  TWS

Scot Sealander wrote:

> Brent Obermiller wrote:
>
> > What about the GN computer on a 2.8L ('87 newer FWD) Chevy.
> (snip)
>
> > 1.) is the DIS remotely compatable, or use the Buick?
>
> The DIS will send the correct stuff to the ECM for ignition.  But
> the SFI ECM needs a cam sensor to know where it is in the firing order.
> I bought a distributor from an older 2.8 to try and use it as a cam
> sensor....  Need a Buick Regal 3800 SFI underhood ECM, anybody got one?
> Wanna trade a 1227749?  Maybe two? ;-)
>
> > 2.) Can the code be modified for the ignition pickup (in degrees) as
> > the 2.8L pickup is in the block (not on the balancer like the GN)
>
> No problem there.
>
>
> > 3.) Would the 2.8L flow enough air through the MAF for idle.
>
> May need to alter the min flow value.  Need to try it.
>
>
> > 4.) Would one use the 2.8L knock sensor with say an '86 knock module,
> > as the knock circuit is integrated in the newer (style) ecm.
>
> Use the older C3 style 2.8L knock module.
>
>
> > Any thoughts?
>
> Forget the C3?  Use something newer, you'll be glad you did.
>
>
> > P.S. Anyone know anything about the Turbo 2.8L Grandprix's ('88 I
> > think), like which ECM they use?
>
> Quite a bit, (I own one).  The turbo GP was available in '89 and '90,
> and uses a 3.1L engine.  The car uses a 1227727 ECM, just like (most)
> all the other 'W' bodies.  This is an underhood version of the 1227730.
>
> It is speed density, but the VE tables are VERY poorly calibrated in
> stock form, like higher VE's at 60 kPA MAP than at 100 KPA in some
> places!  There is also an error in the fuel algorithm in the stock chip.
> With the stock cal, the car tends to stall often.
>
> Fix some of the problems, and the car runs very well.  ;-)  I am working
> on cals for bigger injectors, a 3-bar MAP, a custom scan tool, etc.
>
> I wrote some "auto-learn" code for the VE tables.  It will fill in a
> new 16x16 VE table with corrected VE values.  The code is not installed
> yet (has been re-assembled), and it ought to be interesting if it works.
> The routine is so simple, I may post a code snippet, (if it works).
>
> Scot Sealander