That gol durned fuel injection

Frederic Breitwieser frederic.breitwieser at mcione.com
Wed Apr 30 03:39:53 GMT 1997


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I think you made a lot of good points here... the issue about FI being 
"untunable" is the idea that most factory ECMs are generally coded to 
operate under a predefined circumstance, with tolerence for minor changes. 
 Headers without a doubt add performance, however not enough that most 
factory ECMs can handle the reduction in back pressure.  I've heard people 
comment that after a while the ECM overcompensates and slightly negates the 
modifications.

Where factory FI loses its advantage is when you decide to put in a 
"thumper" cam, or make radical performance modifications to your engine. 
 Then, the engine is no longer a "constant" and the internal ROM mappings 
will not apply any longer.

Of course, the solution is either to go back to carbs, but that's silly I 
think.  Holley Projection is reasonable in cost, and of course, there is 
Accell, Haltach, and Electromotive aftermarket EFI systems, which allow one 
to attach a PC and make minor changes to the map table.

Frederic

-----Original Message-----
From:	Aron Travis [SMTP:atravis at spacey.net]
Sent:	Tuesday, April 29, 1997 11:43 PM
To:	diy_efi at coulomb.eng.ohio-state.edu
Cc:	Homebrew-Autos at bolis.com
Subject:	That gol durned fuel injection

This article goes on to say nothing beats a V-8, no torque in a four
banger, etc. I guess they don't realize things like power to weight
ratios, or why some punk on a two stroke dirt bike can whip most cars
on the road, V-8 or not.

P.S. Not that I'm anti carb, just pro FI!

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