350 roadmaster ecm / 7747 ecm

[Carl Summers]

Hi Brent,
         You will want to get a v-8 cal-pak (the small chip about 2 inches 
away from the 2732a chip).  I am pretty sure the roadmaster was setup with 
an intake air temp sensor and the 747 is not, so might be some pinout 
changes to make. hth's
-Carl Summers

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-----Original Message-----
From:	Brent Obermiller [SMTP:ober_b at sssnet.com]
Sent:	Wednesday, July 28, 1999 2:50 AM
To:	gm
Subject:	350 roadmaster ecm / 7747 ecm


Hi, I'll try to make this short.  I have an 1978 Caprice w/ a 92 Buick
Roadmaster 5.7l (Chevy 350 TBI  vin "7"). Put Trickflow heads on it, the

public service (police) prom, and 3:42's and have enjoyed it for 14 mos.
now,
but the bug bit and I spend the last month putting a 96 LT4 cam and the
Holley TBI (base) w/ the org. GM tower and injectors.  It *runs* well,
but the idle needs raised, the exhaust smells rich (BL=~109) , and and
the gas mileage is not so good (13-14mpg highway).  I bought a Needham's

PB10 and looked at the code. I found one table but little seems similar
to 7747 specs (it's a 16136965) so I bought a 7747 out of an 87 astro w/

4.3l (couldn't get a V8 at this yard, yesterday).  I need to know if
there is anything to know or do when using this V6 calibrated ECM this
w/ the V8.  Any info on the 16136965 would be appreciated as the there
is no provision for the A.I.R.(not so concerned) and fuel vapor canistor

(envisioning my ABS gastank collapsing) w/ the 7747.   Any positive
commentary would be appreciated in general.  Thanks.

Brent Obermiller

P.S. I'm really enjoying the turbo fiero info and NOW I wish I hadn't
sold my Z24. :)

Also, does anyone whether the lm3914 bar graph circuit can be hooked in
parallel to the existing o2 sensor or do I need a second one near-by?