Need some PROM-tweaking halp...

[rr]

Go to:

http://efi332.eng.ohio-state.edu/gmecm/projects/747_ignition/

And get the writeup and the ecu file...

For anyone else reading this, I am tooting my own horn,
but the information is good and a worthwhile read.


BobR.

Ron Gregory wrote:
> 
> My buddy and I stuffed a '98 Vortec 350 into
> his '87 Suburban.  He used the Edlebrock
> intake and just used an adapter to bolt
> the stock TBI setup to the intake.
> Of course he got carried away with headers
> and such, but's that's all part of the fun.  We
> still want to run the stock 747 ECM...
> 
> We make a couple diacom runs and
> dumped his Hypertech chip for that truck.
> 
> Look in http://24.4.36.39/ron/dub for the
> Diacom .gdf files and the bin file.
> 
> The data-logging didn't show too much,
> because it was so slow.  He's going
> to install an A/F monitor on the O2 sensor
> to get a general idea of how things are
> running.
> 
> It was 101 F this afternoon, and it seemed to
> run pretty good.  He said that it seems to
> have some poor manners in the morning, though
> 
> There appears to be a bit of a lean
> condition, but it's not too bad.  BLMs
> are above 128
> 
> Let's turn that beast into a tire-frying
> monster <grin>.  Can you point me
> to the tables in that PROM?
> 
> Does anyone know what the TPS
> voltage numbers should be on that
> setup?  We see .66 v at idle and 4.08
> at WOT... doesn't sound quite right...is it?
> 
> Silly question:
> What is the base timing supposed to be
> for that?  There are no longer any stickers
> under the hood of that truck.
> 
> I'll get the stock chip dumped in the next day
> or so.  Then I'll put it on that page, too.
> 
> Bruce P... I think I may have found a home
> for my '99 Tahoe 350 that I'm gonna bolt
> a TPI intake to... how 'bout a Chevy Monza?
> 
> Thanks,
> ~~~~~
> Ron Gregory                        '91 Syclone #1452
> rgregory at iname.com      Garland, TX