Does anyone know the flow rate of the injectors used for the 75-76 Eldorados?

cc/min or lb/hr is fine

I don't know but maybe this will help. The 500 injectors are not the same thing as the 350 or 425 injectors. They are all low impedance type and electrically are not interchangable with popular easy to get injectors. Megasquirt will drive any and all of them and looks like a cheap alternative to over priced unobtanium.

the injectors , depending where you get your information, are rated at 47 to 50 lbs.... If you search enough you can find new replacments very cheap...

the injectors , depending where you get your information, are rated at 47 to 50 lbs.... If you search enough you can find new replacments very cheap...

Where? 500 injectors bring a premium price last 5 times I looked.

I do not know if I can post web sites , so I won't... But I just checked and they still had "Stanard Ignition FJ12" injectors for $13 each... the catch is you have to buy a $500 min order... but when I got mine, it was years ago and if you got less than $500 there was a $50 or so handling charge..not sure if they still do that.. but still it was less than $200 for a set.. and if were me, I would get one or two spares, incase some went bad later..

47 to 50 lbs per hour? ok ill assume that number for now in my calculations for building the death star thanks man

although that seems a little high doesn't it?

I am currently researching the use of a Megasquirt system in place of the factory ECU. Can the factory injectors be replaced with a more modern design? I other words, are they interchangeable physically?

actually going to use a megasquirt as well. ive seen pictures of the injectors just no information. they look modern i dont think injector design for regular cars has changed too much. i could be wrong. are they interchangeable with anything else? i dont know. im just hoping theyll come with the intake when i find one at the junk yard.

I don’t have a caddy yet, I am just researching which year to get for a donor car. I will be installing the drive train into a 73-87 chevy/gmc 1500 truck.
I want the turbo 400 and the 500 so that limits me to 75 and 76, but that also brings with it the FI. After discovering Megasquirt it actually seems to be a plus. Any idea what the CFM rating on the throttle plate is?

Same plan of attack here. Megasquirt and Cadillac port intake. I'm planning on using an adapted throttle body of some sort in order to have a TPS. The Cad EFI throttle switch won't work. Maybe even use a clodrajet adapted to the EFI intake. Rube Goldberg lives. With the Megasquirt the more common 350 injectors might work OK.

http://www.eldocountry.com/eldo/megasquirt.html
This guy added the tps to the Cad setup. Prices seemed great until i found out the wide band o2 setup doubles the cost. I still have not read how well the narrow band setup would work.

Is the FI intake similar to the non FI intake?

Thanks a bizzillon for that link. The same person also put a giant engine in a newer Eldorado. IIRC his name is Cory. Back to the original throttle body. The engine which I'm using is coming out of another car this weekend! I might even get this done in 2007. Also have a 4L80e and diesel controller.

The injected manifold is similar to the carbonated one in weight. There are extra holes and bosses for the port injectors and holes for injector rail hardware. Some have adapted F*rd 460 intakes over for the 500.

I was wondering about the performance of the FI intake. If it is similar to the carb version I would expect similar performance. This site shows the carb intake to be within 95% of the Edelbrock version. The magazine articles are a nice find also.
http://picasaweb.google.com/hsubdarb/Cadillac/photo?authkey=kntbjNA8t1c#5077568697955528530
I have located a diy wide band o2 kit also. Seems to be the key element in the Megasquirt setup. It also seems like the V3 kit might be sable without the flyback daughter board.

If you get a chance could you let me know what the throttle bore measurement is? Just a little curious about available flow with the stock setup.

I am running a cad 500 F/I intake , throttlebody, fuelrail and injectors in a 472.. I made a aluminum plate to adapt a tps... very eazy two screws to bolt to the throttlebody and two screws to bolt the sensor on to the aluminum plate...The stock injectors are low ohm and if you use MS you will need a driver for them... The throttlebody has two ports that are 58mm each or about 2 1/4" each , so you can figure how much that flows....Be happy to answer any questions if I can...

I have been slowly building up my stock of parts to Megasquirt my 69 Deville convertible. I thought about going to the 75-76 FI manifold but found out that if you find a setup, the cost is prohibitive on the money front. I purchased a throttle body from a marine engine that will bolt up directly to the intake ( ebay # 230142888926) but I believe the exhaust crossover in the intake will cause problems. Thought about welding up the intake, but I wanted to leave the motor as unmolested as possible as the car is stock. There was also the thought about going the 7.4/454 TBI setup with separate adapter plate that I could modify to block the exhaust passage in the intake. What's your thoughts?

I don't think the exhaust crossover will be a problem.. but if you wanted to plug it up I have heard of guys melting old pistons and filling up the port..
If I had a 69 deville convert. It would stay with a carb...oyur not going to gain very much...

I've had 2 engines which were converted from carbonator to Cadillac EFI. The difference in wide open throttle performance is nothing to write home about but the difference in part throttle and idle is much more than one might expect. Maybe the Megasquirt setup will take care of the wide open throttle performance a little. I need to do less typing and more wrenching......

I believe the exhaust crossover in the intake will cause problems. Why? Clearance? Temps? Carburetors suck. Pun intended. FI will always give better performance. What is the throttle size on the TBI?

I believe the exhaust crossover in the intake will cause problems.
Why? Clearance? Temps? Carburetors suck. Pun intended. FI will always give better performance. What is the throttle size on the TBI?

I was talking about the heat passages in the intake under the carb. If the adapter plate doesn't cover up the passage I'll have exhaust being dumped straight back down the intake.
I already have a HEI distributor installed and will be using megasquirt to control it as well. The main reasons for doing an upgrade to FI are mainly the better cruising mixture and smooth idle. I know I wont be getting much more power with a injection setup but I can't help myself..
The throttle body is the standard size that is on a 454/7.4 chevy big block. I might not use the adapter plate that came with my tbi, it's a little too tall as is, and it's cast iron, weighs a ton! I'll try to find one off a truck rather that a boat

McDave71... are you using a distrubitor out of a 1981 368, that was a F/I motor? Thats what I am using.. its run by a Haltech

Right now the distributor I'm using is a standard non-computer controlled HEI distributor. In going with the megasquirt, I will look into changing out the 4 pin module for a 7 pin and locking everything down, or I was going to look into the later style HEI that was used on TBI/TPI motors and actually cutting up two distributors to make one.
What setup does an '81 368 distributor have? Is it locked down for full computer control? If so. I need to look into this..
Just a little more info on my parts scrounging, I found a FI intake setup from intake through filter housing for $125 total. This sounds like a good deal but it's really not. The filter housing was bent along with the injection lines in shipping. I'll need all new injectors too.The throttle body is seized up and might not be usable for anything, which isn't so bad. I was looking into using just the base of a TBI unit for the IAC valve and the TPS sensor. I'l just have to make an adaptor plate for the intake to TBI bolt holes.

I'm currently using a v2 megasquirt on a modified 500 caddy. I'm using an Edelbrock performer manifold with bungs welded in the ports,aftermarket ford 460 truck throttle body(twin 65mm) and 39 pound injectors. Those should be big enough for 500 horse, seems to work great. This in a 53 Stude and only used 1/4 mile at a time but is totally streetable other than the 12to1 compression. Still tuning. You won't get more power with efi but it is way tuneable. Hve fun.

drmenard , can you pm me that website where you found the FJ12 injectors? I've found a few places but all prices are around 30 to 40 a piece. I'd be willing to buy $500 worth and turn around and sell the excess off the recoup the extra costs.
I don't have enough posts to be able to pm you..

The distrubtor you want is off a 81 F/I 368... it is a seven pin module type.. I have been using one for over 5 years with a haltech computer...if you plan on using stock type injectors, they are low ohm and will need a driver type box for the extra power it takes to run them... I tink mega squirt has one. kit...
the 81 F/I 368 will have the big ugly valve covers....

If you can't find an '81 then the ignition module should be the same from an HT-4100. You could stuff that into an older HEI and eliminate the vacuum and mechanical advance if it will be done electronically.