[Chevelle-list] aftermarket efi

[Keith Anderson]

>From: "Devin" <devin at valleyautomotivesupply.com>
>Reply-To: The Chevelle Mailing List <chevelle-list at chevelles.net>
>To: "The Chevelle Mailing List" <Chevelle-list at chevelles.net>
>Subject: [Chevelle-list] aftermarket efi
>Date: Sat, 18 Nov 2006 18:21:31 -0800

>Is anybody out there in Chevelle-land running an aftermarket performance 
>efi?  If so, what are your results?
>
>Performance?  Driveability?  Cold starts?  Tuneability?  Other comments?
>
>I'm just in the research stage now.  I've got my car to where it is getting 
>near the magic 11.49 NHRA rollbar requirement, and as mine is a Camino, I'm 
>not gonna put bars out the back window.  The power is great, but it's best 
>at wide open throttle, otherwise it's a bit much to drive.  It'll cruise ok 
>above 2200 or so, but it's not truly happy until about 4500.  I'm looking 
>for crisp throttle response and hopefully an increase in fuel mileage.
>
>I love the look of the old-style Hilborn injection setups that BDS is 
>converting to electronic, but not having known anybody who has run one, 
>it's hard to justify the kind of money I'm sure it would take to make that 
>happen.  I've also read articles on the FAST systems, but in checking their 
>website, they don't appear to sell packages, but components that I would 
>have to figure out how to put together.  Holley Pro-jection?  I knew a guy 
>who had one when the first came out about 20 years ago, but I'm sure 
>they've progressed far beyond that by now.  I think I'd prefer a dry 
>manifold system anyway, ie port injection.
>
>Thanks,
>
>Devin


Devin,

I'm running a Holley Commander 950 Pro system on my El Camino.  Pics and 
info here:

http://www.cardomain.com/ride/703372

You can expect an increase in driveability, throttle response, and a cleaner 
running engine.  Whether or not you'll see an increase in fuel mileage will 
depend on how rich your carb is running at cruise.  For example, my Holley 
950HP ran pig rich at cruise.  Anywhere from 11.0 to 12.5!  However, my 
Holley 3310 (750 Vac sec.)  ran right at 14.5-15.0.  I got the same mileage 
with the 3310 as I do with EFI, 15-17mph.  However, the 950HP never did 
better than 12.  Large cams really kill your fuel mileage.

There's an excellent EFI forum on Chevytalk.com.  You may want to check that 
out:

http://www.chevytalk.org/threads/postlist.php?Cat=0&Board=UBB12

Keith