TBI and DYI_EFI list

[Corey L. Cole]

Tom Cloud wrote:
> 
> >I'd agree that the OEM systems are the way to go with stock engines which
> >have a later model counterpart with EFI of some sort i.e. early and late
> >small block chevy or ford.  It's fairly sophisticated and reliable stuff.
> >
> >My problem is I want to TBI something that never had injection and was
> 
>         [ snip ]
> 
> >If any of you have some insight on how exactly to get some of this OEM stuff
> >to adapt inexpensively, please share it.  It would seem that the EFI wouldn't
> >know if it were installed on a ford, chevy, or packard, but what how do I
> >pick out what I need?  What should I look for in my local junkyard?  Then
> >finally, after I get all the components, how do I tune it for my application?
> 
> aaarrrrrgh .... this is the point I keep coming back to.  You're
> either stuck with retrofitting an existing oem app with the stock
> unit designed for it, or building your own.  Someone please tell
> me it's not so.
> 
> MAF systems seem to overcome those problems, but I share your
> feeling for the simplicity of the carb look-alike TBI unit.
> For one thing, it might help pass some nosey inspector's visual,
> since the rest can still look stock.
> 
> Has anyone done any fiddling with TBI / MAF combinations?  It'd
> be interesting if the MAF could be put in the air cleaner intake
> to look almost stock.
> 
> Tom Cloud <cloud at peaches.ph.utexas.edu>

Why would you use MAF with TBI?  It's my understanding that TBI is usually
hooked up to MAP, which is the functional equivalent of "vacuum control" that
carbs use.

However, I'm not so sure about using MAF with the stock aircleaner from a
practicality standpoint.  It would have to be placed upstream of the filter,
which would make for a short MAF life.  Then there's the issue of the size
of those things (Although I seem to remember seeing a while back in some mag
that researchers had come up with tiny, single chip airflow meters that were
the size of postage stamps.  They were saying that you could put one of these
in each runner, and have a very accurate EFI system.)  Sorry, got off on a
tangent.

Anyways, that's my put on why you shouldn't do it (although you could if you
wanted to...)


-- 
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Corey L. Cole                     | Cole's Law:  Thinly sliced cabbage
 M/S 19-HH                        | 
 E-mail: corey.l.cole at boeing.com  | Perpetual optimism is a force
 Phone: 206-662-3596              | multiplier  -Gen. Colin Powell
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