4.3L TBI

[peter paul fenske]

ONE MORE TIME

Basically I have run a 97 vortec on a 730 ecm, the j car harness
and a 91 camaro auto 3.1 cal. This with 6 injector cpi.

You don't need a controller

:peter

At 03:52 PM 5/18/98 -0700, you wrote:
>	Charlie
>
>The TBI 4.3s built through 93 do not have a balance shaft, but the 94-95
>does have a balance shaft.  A GM parts book can confirm this.  Fuel
>Injection Specialties wants to install a stand alone harness and
>controller in truck (can you say expensive kluge).  Howell did not
>respond to an Email I sent asking if they can modify the 94 software to
>run a CPI with a manual trans.  The same powertrain controllers were
>used on the CPI and the TBI for 94.  So the powertrain controller I
>currently have has the ability to run a CPI injection system, but it is
>also set up to interface with an automatic transmission.  I do not know
>what incompatibilities exist in CPI software when it is applied to
>manual transmission, remember GM never sold this combination. 
>
>
>> At 06:23 PM 5/17/98 -0700, Rich Vandervoort wrote:
>> >I have a 4.3 TBI  GM v6 and would like to get more H.P. out of it as
>> >cheaply as possible.  So my current plan of attack is to increase the
>> >throttle body size and install a more aggressive camshaft.  Are the
>> TBI
>> >units for the v8 truck engines similar with larger bore sizes?  Are
>> >there any camshafts that can be used with the balance shaft.  Does
>> >anyone have software to monitor the ALDL signals from this motor and
>> >change calibrations (94 Sonoma).  I am shying away from the CPI
>> because
>> >it was never used with a manual transmission. 
>> 
>> Rich, if you have a TBI engine, you don't have a balance shaft--it's
>> only in
>> the CPI engines.  Camshafts are not interchangeable between these
>> engines--the TBI cam has a mechanical fuel pump eccentric but the CPI
>> cam
>> does not (so length is different).  You can, however, put a CPI
>> manifold on
>> a TBI engine and significantly improve HP.  Talk to Howell EFI
>> (www.howell-efi.com) or Fuel Injection Specialties
>> (www.fuelinjection.com).
>> 
>> Charlie Morgan
>> 
>
>