Re: dual tbi on a big block

[Squash <realsquash@yahoo.com>]

IMHO, you will have less headaches with a port-injection setup.  You can use a standard, fast, 730
(the tpi ecm).  You might have to spend a bit more, tho, depending on mow much time you want to
invest.  More time=less money.  Less time=more money.  If you want to make your friends drool, do
a stack system converted to port EFI.  

How much vacuum do you pull at idle?  I wonder if anyone has made a MAP sensor faker-outer yet for
guys like you with no vacuum.  I'm not sure how the 730 would react with so little vacuum, but i'd
bet it can be made to work :)  Maybe you could design a circuit that when at 0% TPS the MAP output
would read say 30kpa.  Time or money, u choose.

Squash
http://www.trailrunners4x4.org/users/realsquash (454 port EFI conversion, but less cam)

--- ZZZ Temp-Gold <Temp-Gold@highlandsins.com> wrote:
> Hi all,
> 
> I like to say, I really enjoy/appreciate this forum. I have learned a
> lot.
> Ive been looking for information in the archives about how to fuel a
> modified big block. 
> 
> I have read about the jeep efi conversion and the power gains. Looks
> attractive, not to mention all the other  advantages of efi.
> 
> I have a 468 ci (.060 over 454) with a large duration cam (comp 306/626
> lift) and so on. (The shop that did the machining predicted 540hp.)
> Currently, I have dual 600 cfm carbs on her. Runs good up to 7000rpm. Id
> like to replace the carbs with dual tbi. One thing that comes to mind is
> the
> motor has very little vacuum. If this is a problem, is it possible to
> overcome it via programming? 
> 
> Ive have seen the diagram explaining the different sized tbi injectors.
> I am
> not sure how to calculate which ones would be adequate for my
> combination.
> 4-90lbs/hr?? Ive read that a single gm ecm, like the '747 will not
> support
> four injectors. Would the solution be to run dual ecms? Also, a while
> back,
> I asked HalTech EFI about dual throttle bodies with their ecm and they
> said
> it would not be enough fuel. Is this accurate?
> 
> Also, would an ecm from one of the tpi motors power four tbi injectors?
> 
> Is this a viable solution, or should I plan on mpi? 
> 
> All advise is appreciated.  
> 
> Thanks,
> 
> Greg Gold
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