350 roadmaster ecm / 7747 ecm

[Shannen Durphey]

Brent Obermiller wrote:
> 
> 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
Stock LT4 vers. or the "hot" cam?
 and the
> Holley TBI (base) w/ the org. GM tower and injectors.  
Is this a high flow base for factory tbi manifolds?

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.  
You need a v8 calpak, part no 16060836, about $10 just two weeks ago. 
You also need to change the cylinder select bit or run an 8 cyl
calibration.  I have several 747 calibrations if you need one for an 8
cyl.  Which trans and rear gears are you running?

Also, Bruce Plecan mentioned the ECMguy's hac page, here's the link:
http://www.geocities.com/MotorCity/Shop/9938/

Shannen
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?