Stole this info from the Buick list. Everything also applies to the 215\Rover
V8
Greg
----------------------
I've run the Holley Pro-Jecton 4Di system for about a year now. It's
installed on my '70 350. The 4Di system is the feed back system (oxygen
sensor) with a serial computer PC connection. The PC connection is really
neat, it's used to download the ignition, cold running, acceleration
compensation, and a host of other 'maps' to the EFI computer. It is also
can be used to monitor the EFI system while running. Once everything is
set up, the laptop isn't neded anymore.
Overall, I'm happy with it. The installation and set up was straight
forward. The hardest part was installing the fuel pump, filters (2), and
running all the wires. Because it's reprogrammable from a laptop and it's
a closed loop sytem, the set up was considerably easier than the earlier
Pro-Jections.
I feel this system would be good if you have a difficult engine to
carberate and want to keep it streetable. The flexability is amazing. It
drives like a modern FI car, start it up and go! No cold running hicups or
heat soak funny business.
I also managed to get the electronic ignition advance to work. I did this
by using a distributor housing off a late '80s 231 and electronics (7 pin
module) off a Chevy V-8. This is more a car geek rather than computer geek
toy.
One hidden cost of this, or any, square bore carberator set up is that you
need to get an aftermarket intake manifold. I didn't, used an adapter
plate, and had some really wierd transient vacuum problems.
I upgraded to the TA intake and things seem to be working better. I did
the upgrade along with ported heads + big valves last weekend. It's been
raining here since then so the tests have been limited so far.
Acceleration test 1: severe wheel spin. Acceleration test 2: severe
wheel spin. Well, you get the picture. Hopefully the weather will clear
up tomorrow.
-Tom
At 07:41 PM -0400 9/18/99, Bob Cunningham wrote:
>Alan,
>
>I run the original Holley Pro-Jection, and have had it since 1992. This is
>the "analog" version.
>
>The Fuel Injection is a key part of my buildup, which is built for
>daily-driver reliability/economy and peformance. (You may recall I drive
>the car every day, it weighs about 4200 lbs empty, get around 15 MPG
>day-to-day driving, and last night I ran a 13.3-@105.3 without nitrous).
>
>Is it worth it? I don't think so. There is definately an increase in gas
>mileage, but I'd say it's around 10-15% or so. If you calculated how long
>it would take you to pay back the $1000 you spent on the system, you got a
>long time. I might have done it by now after the 7 years, but keep in mind
>it's a daily driver.
>
>I also believe, however, that the fuel injection is costing me a smidge in
>performance. I would probably be a tenth or two faster if I had a well
>setup carb. But due to the wizardry of TA performance and how much power
>the engine makes (while staying a perfectly tame daily driver), I decided
>to live with that decrease.
>
>If I were do it again, I would get a good Port-type system, probably from
>Force-EFI in Florida. I believe that a Port system will actually produce
>more power than a carb, and there are a few small annoyances about the
>Pro-Jection that I'd just assume do without.
>
>It is a pain to install, too - you absolutely have to get to know the
>system inside & out, because you'll spend a long time tuning it. If you
>get the Pro-Jection, plan on about a month of tuning, testing & re-tuning,
>while you get to know the system. If you get a better system like the one
>from Force-EFI, it'll probably be optimized much faster. Keep in mind,
>though, that that will require even more work to install.
>
>A nitrous plate fits very nicely under the Pro-Jection... :-)
>
>Hope that helps, I'd be happy to answer any questions.
>
>-Bob Cunningham
>
>
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