MSefi.com read only forum (Jan.15,2018)

I just purchased an "84 RR Silver Spur. Turns out that a prior owner had replaced the D-Jet injection unit with one from what appears to be a Mercedes. New or used injection systems are almost impossible to come by or are prohibitably expensive. I do have a built MS1 and an MSII kit on the shelf. Does anyone have any thoughts on the feasability of a project of this nature? Any input would be deeply appreciated.

I don't see why not. The only difficulty is that you're treading your own ground, its not likely you will find anyone else who has tried.

Who makes the engine? Is the engine used in any other cars? Do you have info about the oem triggering setup? Basically all you really need is a compatible trigger.

DonRocco,
I wish I had these kinds of problems... what type of fuel management system should I put in the Rolls .
People will need a little more information - injector type, etc. If memory serves the D-jet injectors were low impedance, but given that it was replaced someone may have put in high impedance or something completely different, like the older CIS type that used a fuel distributor as opposed to the typical D-Jet set up. What type of board do you have V2 or V3? If you have low impedance injectors, the fly back circuit will be needed (built in on V3, and additional board on the V2).

Getting it to go should not be a problem, what type of engine is it (size, # cylinders, turbo or no, etc), and what do you want to control? fuel or fuel and spark?

- Charles.

There are quite a few D-Jet systems out there in old VW Type 3's and 914's, as well as Mercedes. You can get a complete D-Jet system for the type 3 for under $150. The basic system is fairly straight forward and there are several web sites dedicated to the D-Jet. That said I purchased my MS just so I can run injection on a Type 3 without the D-Jet (the cam' I'm planning on causes the D-Jet to not work) -- so yes it is very feasable.

You will also need to decide if you want to keep the current distributor wtih and use the trigger points as a "tach" signal, or add a trigger wheel and go with a modern ignition as well as the injection controller. The only part of the D-Jet you should probably keep is the injectors. The TPS, Temp Sensors, and MAP would all need to be replaced. Your Idle circuit may also need replacing depending on if it is electrical or mechanical, and if you want to use the extra code to control idle values (I went with the IAC from Matt's site).

Good luck -- and post some pictures...

LEs

I'm kind of surprised it would be running a D-Jet in the 1980s; I would have expected a K or L Jetronic from the factory. I've seen quite a few K-jetronic to Megasquirt swaps done on Mercedes and VW applications. L-Jets are very easy to deal with - and D-Jets can use most of the fuel system. With K-jets you need to replace the injectors and regulator. Probably the easiest way to do this would be to start with the MS controlling just fuel and leaving the original distributor controlling ignition.