502 ramjet - Team Camaro Tech
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post #1 of 4 (permalink) Old Dec 10th, 10, 01:47 PM Thread Starter
otis
 
Join Date: Dec 2010
Location: ky
Posts: 2
502 ramjet

I recently bought a ramjet off a boat 454 ramjet.

It has the P/N 12489493 ECM

It looks just like the ones that are on cars.

So I have a couple of tech questions please.

I got the distributor with the setup, it is a small cap, does it have an external coil and if so is there a special brand etc.

Does the distributor connect to the ramjet wiring harness? The distributor has 2 places for plugs on it.

The book talks about a crank position sensor, I am installing on old school big block is this needed if so could you recommend a part number.

Also it has a wire that says to connect to fuel pump. Do I need to use this or can I just connect my fuel pump to my electrical system instead of going thru the ramjet electrical.

If any of you are willing to talk over the phone that would be best for me,

Thanks for any help

Otis
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post #2 of 4 (permalink) Old Dec 10th, 10, 05:14 PM
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Mike
 
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Location: Spring Texas
Posts: 5,580
Re: 502 ramjet

Is it a MEFI 3 or MEFI 4? The only difference is the MEFI 4 has the oxygen sensor which helps with the surging at idle.

You can change it to the MEFI 4 but you have to buy the kit from GM. It comes with a new harness, computer, temp sensor and oxygen sensor. $600.00

Do you have the instructions for installing the ramjet. You probably can get it from the dealer or I might have a copy of it.

There is a seperate coil. It is black and has 2 connectors on it.

The distributor connects to the wire harness. One plug from the harness to the dist and then from the coil to the dist.

It does not have a crank trigger. All the connections were on the throttle body, ramjet, dist, knock sensor, temperature sensor.

We used the wire in the harness to the fuel pump.

It has 2 relays, one is a run relay, the other fuel pump relay.

On the plugs that go on the computer. They connect on either side of the computer so be careful when hooking it up. It will not hurt anything but the fuel pump wont run. I chased that for a while.

Here is a couple websites for some info and a GM troubleshooting manual.

This is older info,,all I could find at the time.
http://www.sallee-chevrolet.com/Disc...3418/4500.html

You can see the coil in this picture.
http://www.hotrodlane.cc/newhtml/rj502.html

Here is a scanning tool. They give you a little tool to plug in the harness and count lights with the original kit. This is a seperate scan tool.
http://www.rinda.com/RamJet/ramjet.htm

Here is a good manual to get. They also have one for the MEFI 3
http://paceperformance.com/i-5136078...4-version.html

Look in my photobucket under my signature. It has the 502 ramjet I installed in my buddys car under Marks car.

Mike
69 Camaro Prostreet - purple w/ghost flames , 502 w/ 871 blower


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post #3 of 4 (permalink) Old Dec 10th, 10, 08:06 PM Thread Starter
otis
 
Join Date: Dec 2010
Location: ky
Posts: 2
Re: 502 ramjet

Quote:
Do you have the instructions for installing the ramjet.
I don't have the install instuctions , could you make a copy for me I would be glad to pay.



Thanks Mike

that is a great help.


Otis
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post #4 of 4 (permalink) Old Dec 11th, 10, 03:04 AM
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Mike
 
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Re: 502 ramjet

I am out of town till wednesday. When I get home I will see if I still have it.

Mike
69 Camaro Prostreet - purple w/ghost flames , 502 w/ 871 blower


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