Carby / supercharger

[David Sagers]

Date: Thu, 29 Jul 1999 08:51:16 +0800
From: dzorde at erggroup.com
Subject: Re: #437 Carby / supercharger

dzorde at erggroup.com wrote:

>I will be efi'ing the car if the set-up works.  At the moment I >don't know 
>if it'll work and so I don't want to spend money and time >trying to get an 
>efi system going until I have proven that the >engine will last and it can 
>generate enough power to make the car >competitive.

>I still haven't quite comprehended the carby thing yet, but >pressurising 
>the whole setup does seem to work till boost exceed >fuel pressure at which 
>stage it obviously runs out of fuel.  As for >a tbi unit, I'm sure I could 
>make a system of a small Jap car work.

>Thanks for the effort up to this stage.

Consider that at best carbs and s/c are barely compatible.  If you s/c and 
try to get everything dialed in with a carb you have a good chance of giving 
up in frustration or detonating an engine.

You can save yourself 1,000s of headaches and hours of frustration by 
installing a tunable aftermarket EFI system and completely forgetting the 
carb.  Buy a EFI system that is tunable and compatible with a s/c.  A couple 
come to mind such as the DFI and the TEC II.  Both are used successfully 
with turbos and superchargers.

There is also good news about the price of these units too,  Since the 
introduction of the Fel Pro EFI that does everything better and faster many 
serious racers are dumping the DFI and TEC II units as they step up to the 
Fel Pro ($2400).  Even the used units aren't cheap, but certainly less 
expensive than just a few years ago.  Recently I saw a used DFi system with 
the AIC and some other options for about $800, think that included injectors 
too.  Used TEC II are a little harder to find but they are out there.

I have in my library a book written by a guy in the South, describing a 
complete engine, turbo and DFI build up of a twin turbo SBC.  He even gives 
the setting for the DFI fuel and spark parameters.  Cost me about $60, but 
having all the parameters figured out is worth $60 many times over.

When looking at a TBI remember that there is a lot more aftermarket parts 
out there for the GM unit than any other brand, including the Japanese 
units.


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