4.3L TBI

[Vandervoort, Richard D]

Peter

The 97 vortec uses a different intake than the earlier cpi.  These
intakes are not compatible with the earlier heads, but this may be as
simple as the intake to head bolt angle.  I am not sure what is
different.  The earlier CPI has an electronically air door in the
plenum, does your 97 vortec have this and is it controller by your 91 60
degree programming?  


> 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
> >> 
> >
> >
>