[Gmecm] Choosing ECM?

Fri Sep 16 22:57:32 UTC 2011

I am in Chicago area, I use kPa in all my OBD2 tuning stuff.  Just used to
it.

I'll check out the code59, sounds cool....  :)

On Fri, Sep 16, 2011 at 5:46 PM, Avery Nisbet <anisbet at gmail.com> wrote:

> Code 59 is a hacked up version of GM ECU code/firmware.  There is a
> group of people working on it at http://www.code59.org  Go check it
> out.
>
> The code59 program Uses a 3bar map sensor by default. Thats ~300kPa.
> The software originally came form the Buick grand national. Do a
> youtube search for that car.  It was a turbo car thats way it had the
> 300kPa sensor.  If you want to use a 1bar sensor(Im guessing its an NA
> engine) you can. I would not put a voltage divider on it.  The ECU
> typically does a pretty good job without it.   The problem is with a
> loopy cam the changes in pressure are very high between intake valve
> open and close at idle.  I think most people fix the problem with
> plumbing and not electronics.  Or they ignore MAP at idle.
>
> The code59 program also take all the sensors you are wishing to add
> into account for tuning(Intake air temp, coolent temp, TPS and more).
> If you want to run LowZ injectors you can change out the injector
> drivers in the ECU or you can use a driver board ment for megasquirt.
> Lots of people like this one
> http://www.jbperf.com/p&h_board/index.html
>
> Also if you have trouble sourcing a US ECM  in europe(I guess your in
> europe because you used KPa and not bar) you can check out this site
> for info on the euro and aus ECM's.
> http://www.delcohacking.net/forums/
> They focus on the European and Australian model ECMs  I would just
> hunt around on there for one that can run code59 or some similar
> software.
> The 808 ECM is very popular on that site and may be easy to find
> outside the US.  The 7727 and 7730 and its replacements are probably
> the most common in Junkyards in the US right now.  GM made a lot of
> FWD V6 cars in the 90's.  These can run the code 59 program but they
> have high Z injectors drivers. The 7749 which is hard to find, was
> used in Turboed cars(buick GN and pontiac turbo sunbird). It has peak
> and hold or lowZ injector drivers.
>
> -Avery
>
> On Fri, Sep 16, 2011 at 3:01 PM, Thomas Martin <n0dih1 at gmail.com> wrote:
> > He comes off the transbrake now at 6000 rpm and shifts at 8000 rpm.
> Alpha N
> > is really what he wants, he is planning at the moment, to keep his
> existing
> > distributor and MSD7 in there.
> >
> > I was thinking if he idles at say 70 kPa and goes to 100 kPa, we could
> scale
> > the MAP with a voltage divider and give him idle at 30 kPa and then he
> has a
> > bit more granularity to run on the VE table.
> >
> > What is Code 59?  Or is it who?
> >
> > We are looking at low impedance 90 lb/hr injectors, so I will have to
> design
> > up a high to low impedance driver ckt.  That should be no worries there.
> >
> > I told him it would be helpful to have a IAT and CTS sensor, but we could
> do
> > without and fix it them too, or put in dash switches for it so he can set
> > based on his weather station.  I like the IAT measuring the IAT as it
> will
> > show actual track temps of the air coming in.   And compensate for cold
> > start up.
> >
> > Tom
> >
> >
> >
> > On Fri, Sep 16, 2011 at 4:51 PM, Avery Nisbet <anisbet at gmail.com> wrote:
> >>
> >> Code 59 has fixed the max RPM limit already. I think its work up to or
> >> over 7k now.
> >>
> >> You could tune for just RPM.  Because the load will only change when
> >> you change tracks or if the weather changes at the track.
> >> Replace the Map sensor with a resistor and the TPS will be your only
> >> load scaling input.  There are a lot of EFI systems that work this
> >> way.
> >> Im sure the GM or mega$quirt stuff can be tricked into do this pretty
> >> easily.
> >>
> >> -Avery
> >>
> >> On Thu, Sep 15, 2011 at 6:12 AM, David Allen <davida1 at hiwaay.net>
> wrote:
> >> > Thomas, I would assume that cam does not have a smooth idle and does
> not
> >> > have much vacuum at idle. You may have your work cut out for you
> tuning
> >> > that
> >> > thing!
> >> >
> >> > What level of horsepower and RPM is it running?  Different ECM's and
> >> > programs have limitations on the max RPM it can calculate. If you
> exceed
> >> > that RPM it won't output the data correctly and the tables may or may
> >> > not be
> >> > scalable to that area.
> >> >
> >> > Not trying to discourage you from this project - just warning of a few
> >> > things you will have to overcome.  Others on the list can give more
> info
> >> > on
> >> > specifics. I've never run into any RPM limits because my builds have
> >> > used
> >> > turbos and not high RPM.
> >> >
> >> > Sincerely,
> >> > David
> >> >
> >> > ----- Original Message -----
> >> > From: Thomas Martin
> >> > To: gmecm at diy-efi.org
> >> > Sent: Wednesday, September 14, 2011 9:48 AM
> >> > Subject: [Gmecm] Choosing ECM?
> >> > Friend of mine is looking to run his 9.70 at 134-135 mph Olds Small
> Block
> >> > powered race car on EFI.  Cam is around 324 degrees at the seat.
> >> > For those who have run the OBD1 PCM/ECM's, what would be a good
> choice?
> >> >  He
> >> > primarily needs it to handle fueling and timing.  Or would it really
> be
> >> > better to go with a LS1 PCM like an 0411 and OBD2?  Not worried about
> >> > flashing at the track to make changes.
> >> > It needs to idle, and goes WOT.  It spends very little time anywhere
> >> > else.
> >> >  Currently has Nitrous (125 hp shot).
> >> > I have RT-CATS Tuner and TunerProRT, Moates APU1 (Burner/real
> time/RS232
> >> > interface/emulator combo) and he has a TPI computer now, he has to
> look
> >> > and
> >> > see what PN hardware he has.  And he has a bunch of PROM's for it.
> >> > Thanks!
> >> > Tom
> >> >
> >> >
> >> > ________________________________
> >> >
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> >> >
> >> >
> >
> >
>
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