Dusty wrote40-50psi at 250 gph IIRC
With as strong as the engine ran with a 750 Edelbrock and with a 770 Holley TA and R4B and a Performer intake in the past I was less than thrilled with its performance with the Fuel injection. On long WOT runs the system occasionally started to loose power as though I was running out of fuel, especially when pulling a long grade with weight. It had great idlability but above 3500-4000 rpm the fuel starvation did irritate me. Granted I was running a .512 lift cam on a 274 adv dur with 226 @.050 on a 112 lobe separation on 10.2:1 compression ratio the engine held 15-16# vacuum at idle. I had several chips from edelbrock burned and still performance suffered at the higher rpms. I had a shop in Santa Rosa that deals with tuning Edelbrock fuel injection systems try their hands at it and even once it was dialed in never had the pull like it did with a 4BBL on top. So ultimately I have sold the Fuel injection with I still think is a good product and am going back to the Carb its cheaper, simpler and I can diagnose it easier. Personally after two years of battling it and throwing money at it, having the uni-light distributor burn out once and having edelbrock replace it, as well I had the O2 sensor go gunny bag and leaned out the system to the point on the first 200 mile road trip after fixing a flaw in the original machine work the engine that a few things in the engine paid the price (valves), I have opted to take the aluminum heads off, go back to cast iron heads for lower comp ratio.
Also Mileage wise I got .5 mpg difference between the Fuel injection and my 750 carb on a performer intake. I will say that when we tried the EFI out on a 360 we had no problems with fuel starvation and on a mild 401 with stock compression it ran pretty good as well I still think that with carbs those motors ran a little harder but the efi offered some very nice driving characteristics and idling over the rocks the EFI was unmatched. Side by side All said and done it seems like if you install it on a stock motor or RV camd motor your looking ok and for the money I think the howell TBI injection works just as well for less money. The Uni-light going out irked me especially since you cant even drop an HEI in and get home nor can you find a parts store on a Saturday to have the part in stock. (We ended up grabbing the HEI out of the cherokee, performer intake, intake gasket and a 600 that a friend had in his garage 40 miles away from the rubicon and a napa electric fuel pump swapping everything over in an afternoon on the trail and getting the thing off the trail after debating dragging it out.)
The edelbrock is a Very clean very nice setup don’t get me wrong, I did like the way it functioned. But there are several things like the distributor being a Mallory instead of an HEI, the ignition control module as well a few other things that I would have thought without them the kit would have been cheaper or at least a little simpler. Just my humble thoughts.
Im voting for a return to simplicity in my life
Dusty
Dusty,
Sounds like your just the guy I need to talk to since you already bought your education (and then some it appears) on these systems.
You're right the fuel pump puts out 50 psi at 250gph.
My plan is to use this on a stock compression motor (for now) for off-road use. I agree, if I just wanted to squirt a bunch of gas in I would have just went with a TBI, but everyone was doing it so I went the other direction. You have already found some of the limitations apparently and I am hoping for a lot less R&D on mine. I may have to pick your brain when I get to a point that has me baffled. Thanks in advance for sharing.
Also, I was thinking the Mallory hall effect dizzy was the next best thing to (the ultimate) a CPS (for a kit on these AMCs anyway making it easier to retrofit). My thinking was the no moving parts would be a benefit for offraod. At least thats what I think today.
Another thing I like is EB came out with a list of various components that can be replaced with GM or Ford components which are easily sourced from a local parts store, like the ECU (GM), MAP (GM), MAT(GM), CTS(GM), fuel press reg(GM) and IAC solenoid (Ford). I bought an MSD TFI coil (Ford) separately. This is typical AMC anyway, just makes me feel better I can find the wear parts easily.
