4.1 FI

Fri Nov 10 01:21:52 GMT 2000

Thanks for the reply.
This engine has been running for 3 years pretty much like it is.  I planned
for it to have a distributor because I figured that whatever timing that was
pulled out for the additional air flow would compensate for the increased
compression. Any additional timing adjustments could be made with the dist.
I homemade the distributor because the stock type disributor was one of the
huge HEI type and it wouldn't work with the GN intake. If I could afford to
start over again I'd choose a system that was DIS and Sequential FI, but
that would require more money than I currently have.   I also can't afford
to take the vehicle out of service to change it all over.  (It's my daily
driver)  What I meant by knowing the timing is that I know what the engine
requires considering the compression,cam, rod length,etc.  I am one of those
automotive "technicians" ya'll have been talking about but I know a great
deal more about engine performance than probably any you've met.  The engine
needs about 5 degrees at WOT at 1000rpm building to about 32 at 3000 rpm
with a load based addition for part throttle accel. and cruising.  The park
ave. timing curve has way to much load advance variation.  What I also know
is that the Lv8 counts get to 255 at about 1/3 throttle from a dead stop.
The park ave 3.8 was only a 145hp engine and I'm over 200 with this cam and
compression.  I'm pretty much stuck with the setup I have but with proper
tuning I know that the car is capable of 250hp and 25 mpg.  By the way, the
car is a '76 Buick Skyhawk. (Looks like Chevy Monza Spyder about 2800lbs)
With the PROM ID code (51), I have to start the engine with my scanner
plugged in to prevent limp mode,  then can unplug it if I want to. Also,
What do I have to do to get the Winbin program?  What about the checksum
question?
Thanks again.
----- Original Message -----
From: Bruce Plecan <nacelp at bright.net>
To: <gmecm at diy-efi.org>
Sent: Thursday, November 09, 2000 8:15 AM
Subject: Re:


>
>
> I'd go with the 87 1227148 ecm (and MAF sensor).
> You're going to spend alot of time on the ecm end of things otherwise.
> It's well documented at the GN Ttype site,
> Mr James just posted a winbin editor for it, and there is a GMEPro, and
> tunercat for it
>
> Then to go state of the art with it,
> you can add a Direct Scan (monitors things and data logs them off of the
> edge card connector of the ecm.  Even a translator plus off of the Moderen
> Muscle site.
> Granted you not going to have the air flow a GN, but uses the stock stuff
> you have you're probably going to exceed the resoltion of that combination
>
> I'm just suggesting you investigate things more closely, and then proceed,
> there is a bunch of stuff for the GNs that might be handy
>
> I don't understand how you know what the timing table should look like,
> before even seeing what you do have.
> Cheers
> Bruce
>
> > Just found your site a couple of days ago and I'm sure I'm the cause of
> all
> > the anti-html stuff that came out as I signed up.( didn't know what the
> hell
> > all that meant)  I've built a 4.1L buick v-6 with >11:1 compression,
more
> > lift and duration in the cam and '87 GN intake (no turbo) using the ecm
> and
> > harness from a 85 fwd park ave.  ecm is #1227065 w/ATND prom. As you can
> > probably guess the timing map is way off and I need to know if anyone
has
> > worked with a similar setup or can help me program or get the equipment
to
> > program my chip.  I know what I want the timing curve to look like but I
> > don't know how to get it into my car.  I've been working with a guy who
> has
> > done some of this kind of thing but we've developed a prom ID error.  I
> > believe that it is a result of not matching the factory checksum when we
> > finished rewriting the chip.  Is that correct?  The car runs well when
the
> > timing is in the ballpark but it's not most of the time.  My O2 monitor
is
> > happy with the mixture and the control of it so far.
> >
> > _______________________________________________
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> > NetZero provides FREE Internet Access and Email
> > http://www.netzero.net/download/index.html
>
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