port injection for 4.3L V6 ?

[Gonyou, Jeremy (.)]

I was under the impression that the extra CPI ponies came from the higher compression and vortec heads.  

-----Original Message-----
From: ae2598 at wayne.edu [mailto:ae2598 at wayne.edu]
Sent: Friday, July 13, 2001 2:04 PM
To: gmecm at diy-efi.org
Subject: Re: port injection for 4.3L V6 ?


What is it about CPI that gives it that much of a HP increase?  How much
of it can be compensated for through careful tuning on the TBI system?  I
was considering going CPI with my Bravada, but the TBI system is so simple
and elegant that I really hate to replace it with anything so
intimidating-looking :)

 On Fri, 13 Jul 2001, Charles Morgan wrote:

> Howells used to sell a kit to retrofit 4.3Ls with TBI to Central Port 
> Injection.  CPI is not really port injection, though it does have pressure 
> operated poppet valves at each port.  Horsepower is increased from 160 (for 
> TBI) to 200 and peak torque, I believe, is 260 lb ft.  CPI manifolds are 
> listed on Ebay every now-and-again--I think there's one there now.
> 
> Charles Morgan
> 
> At 11:53 PM 7/12/01 -0400, Mel wrote:
> >I have a '90 Chevy S10 with the 4.3L V6 and TBI.
> >It is bone stock.  After a stock rebuild, it is running well again.
> >I believe I understand the TBI system fairly well and
> >would like to upgrade the induction to port injection.
> >I am looking at street use only, with the occasional tow.
> >Would like to improve low RPM torque if possible.
> >Does this type of retrofit even make sense?
> >Are there any factory port injected 4.3 (or other) systems
> >that could be retrofitted?
> 
> 
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