Holley Pro-jection

[superal30]

I purchased a used Holley Pro-Jection, an old analog 2bbl. kit. I was wondering who is running pro-jection, what your thoughts are, and most importantly what's your estimated horsepower? I build engines for a living so I'm not exactly stupid, but this kit is only rated for between 275-320hp. I'm a big fan of a "big nasty" and that's exactly what I'm building. Please no thrashing, I will be building a roller cam small block chevy. The 401 went to live in someone else's jeep. I've got a lot of spare parts :thumbsup: so my budget can stay low, but my options will remain almost endless.

[Wagonforever]

My only experience with the analog Holley system was on an old slant six. I found that system not to be any better than a carburetor. It needed constant tweaking!

[PlasticBoob]

I have heard nothing but bad things about the analog Pro-jection. How many CFM is your engine going to be requiring? I think the Holley 2bbl TBI flows similar to the 454 unit which is 670cfm (I *think* - I have heard numbers ranging from 600 to 670cfm). If it's too restrictive, some high performance places can get them to flow even more.

If you know a lot about engines, why not go with MegaSquirt to control it? You are only limited by your knowledge there! :thumbsup:

[Wagonforever]

As far as I know all the 2bbl Holley systems basically just use GM TBI throttle bodies and all GM TBI throttle bodies are 670 cfm except for the once that came on the 2.8L, those are only 400 cfm. So if you can run a 4.3L-7.4L on 670cfm I think a 360 will do just fine on it.

[Chevelleguy]

I think Holley has a conversion kit for the old analog systems.

I have seen a small block 350 built for a Jeep put out 325hp on an engine dyno with a 2bbl digital Pro-Jection.

[Herk]

Horsepower of any TBI setup probably won't be any better than a well dialed carb.

Cold start and economy might be improved, and if you carb was worn out you'll notice quite a difference.

[will e]

I have one.
Works pretty good for every day driving.
Great for off roading.
Better gas milage than a Carb, about 2 mpg
Easy to adjust for emissions and/or changes in altitude.
Since it is a 'simple' system is is 'easy' to tune but, conversly, not very tunable.
Does a major hesitation sometimes when I am at 3/4 to full throttle.
You will not get 275 HP out of it.
The 275 is if you have the fuel pressure turned up to the maximum pressure. When I would do that, it ran rich most of the time, would not idle well and stumbled. So I turned down the fuel pressure. Drives nice that way but I know it is not giving me 275 HP.
My jeep has a 401 and should have no problems getting to 275HP.

i also had the same unit on my Mustang. It has a fairly well built 351C. The Analog was the bottleneck for horse power (but made it so I could easily pass emissions). I also had to turn the fuel pressure down. Power fell off drastically at 4200 RPM (not enough fuel). When I no longer had to pass emissions I put a Holley Avenger (truck avenger that will go on the jeep pretty soon but that is another story). No other changes, not even a change in the timing, and the difference was night and day from a power prospective.

That's my 2 cents..

[PlasticBoob]

As far as I know all the 2bbl Holley systems basically just use GM TBI throttle bodies and all GM TBI throttle bodies are 670 cfm except for the once that came on the 2.8L, those are only 400 cfm. So if you can run a 4.3L-7.4L on 670cfm I think a 360 will do just fine on it.

According to a quick Google search, 305/350 TBIs flow around 450-480cfm, while the larger 2" bore 454 TBI flows 670cfm.

[Chevelleguy]

That's correct. The Holley throttle body takes the same base gasket as the 454TBI. The 305/350 venturis are much smaller.

[Michael]

I have had mine on for about 2.5 years or more. Once you get it tuned...and you will get a bit frustrated, do not give up. It is the best thing I have put on my rig. Starts like a tbi car...right up great throttle response. Offroading it...well it is great.

Will e, what kind of fuel pressure are you running?

[Twinpinion]

I've ran two kits on two different rigs. A GM 350 target motor and a pathetic AMC 304 with a cam and intake. Both were under 300hp, heck, both were likely under 200hp. The Holley 2-barrel system is good for a junky motor. I could tune them and get them to work well at all angles easily. They would start up easy too. But for pure performance I think you will be unhappy if you are an engine guy. Look to Howell EFI.

Also, many people have problems with these systems because they do not follow the instructions or try to use the wrong fuel pump. The correct-sized return and feed fuel lines needs to be used and routed as said in the instructions or your problems will be neverending. I would tune mine whenever I made major altitude changes of 1500 feet or more. My trucks ran and drove fine on thier sides. In fact I smoked the crank bearings in two motors like that. But they do run rich.

[superal30]

This is my first fuel injected build. I have a chance to get a tune port from a friend. I may try the TPI with megasquirt, but I still need to do some research. I would really like to run this pro-jection(since I have it), but I'm sure it won't be enough for me. I'll probably just run a carb temporarily until I get the fuel injection ready. I really don't need fuel injection for angles, the jeep is at my parents house in Southern Illinois and anyone that has traveled through there knows its all just good ole flatlanders!! I'm looking for dependability, accuracy, and who knows I may come meet ya'll on some hill in the middle of nowhere someday.

[-Bluegill-]

Although I've considered an SBC swap - in my heart I'm an AMC purist. If I stick with my 360, it will get TBI, and currently my short list is either Howell or the Holley Commander 700cfm system. The Commander is digital, not analog - it also controls ignition (unlike Pro-Jection), programmable with a laptop, and the 700cfm is good for 225-400hp. It is more expensive than Pro-Jection, but about the same price as Howell.

http://store.summitracing.com/partdetail.asp?autofilter=1&part=HLY%2D950%2D22S&N=700+4294925239+4294839074+4294853151+4294871516+ 115&autoview=sku