Re: TBI vs Port Injected

[Ward <WSpoonemore@excite.com>]

The L05 5.7l motor picks up about 40 HP and 40#/ft going from TBI to MPEFI

Ward

On Mon, 20 Mar 2000 22:10:00 PST, gmecm@diy-efi.org wrote:

>  For a relatively mild street engine is a port fuel injected motor going
to 
>  produce more horsepower than the same motor with TBI?  Is this an dry air

>  flow versus wet air flow difference or really more related to intake 
>  manifold design?
>  
>  Bruce's crossfire setup is an example of an optimized TBI with a good 
>  manifold, but would this motor have performed better if it were port fuel

>  injected?
>  
>  The following is the background for this preceding questions. I am now 
>  slowly gathering the parts for a "new" 4.3 for my truck(94 m5 s10).  Mild
= 
>  96+ 4.3 heads 2.02/1.60 ported polished and coated, GM performance marine

>  cam in a non balance shaft block, compression ration is TBD, coated 
>  Edlebrock headers and catback exhaust. Currently it uses a 16184738 VCM 
>  (VCMs control both the powertrain and the ABS plus generate the signal
for 
>  the speedometer and possibly other gauges).  My options are;
>  
>  Retain the current fuel system and improve or replace the intake
manifold.
>  
>  Swap the ABS system to a stand alone unit and use a auto tranny
calibrated 
>  16156647 on a CPI fuel system.
>  
>  Find a 1995 16193495 VCM and harness and use SCPI fuel system.  This is
what 
>  I was planning on doing, but I am currently having difficulty finding
parts. 
>    This VCM was calibrated for a M5 and utilized the earlier CPI injection

>  system.
>  
>  Use the 16184738 VCM to control a Sy/Ty fuel system.  Probably the least 
>  practical solution.
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Ward





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