D-jet MegaSquirt&Spark system, Show Stock MSII system in D-jet box Options

[kertwerks]

Hello Group,
My name is Kurt and I love 914's and older 912's.
I have a product I've made for my girlfriends Volvo 1800 that might interest some of the members of your list.
I can offer a Megasquirt&spark engine management systems the modifies the D-jet distributor and replaces the FI timing cam and points with a magnetic trigger wheel and hall effect sensor. it dupicate the D-jet system to Show Stock Quality.
An O2 sensor bung in the exhaust and a vacuum line are the only thing to be added to your car.
I've set up an album on my fliker page here is a link:
http://www.flickr.com/photos/kertwerks/set...157627511841022 You can e0mail me of list @ kertwerks@mindspring.com
Kurt

[JamesM]

With a minor change to the MS injector circuit this can be done using the stock wiring harness and modifying nothing if you are going fuel only. Spark obviously requires dizzy modifications or a trigger wheel.

I have a board mocked up at the moment that integrates the injector circuit change and a couple other modification and solders directly to the stock d-jet ECU connector. Much easier then doing all the wiring to adapt to a stock MS system. Project has been on hold for a while now as life has been keeping me to busy but if you are intrested I can send you a PCB when i get a batch produced. would be nice to have some extra people testing it out.

Hello Group,
My name is Kurt and I love 914's and older 912's.
I have a product I've made for my girlfriends Volvo 1800 that might interest some of the members of your list.
I can offer a Megasquirt&spark engine management systems the modifies the D-jet distributor and replaces the FI timing cam and points with a magnetic trigger wheel and hall effect sensor. it dupicate the D-jet system to Show Stock Quality.
An O2 sensor bung in the exhaust and a vacuum line are the only thing to be added to your car.
I've set up an album on my fliker page here is a link:
http://www.flickr.com/photos/kertwerks/set...157627511841022 You can e0mail me of list @ kertwerks@mindspring.com
Kurt

[kertwerks]

[quote name='JamesM' date='Feb 5 2012, 11:42 AM' post='1618818']
With a minor change to the MS injector circuit this can be done using the stock wiring harness and modifying nothing if you are going fuel only. Spark obviously requires dizzy modifications or a trigger wheel.

James,
First, I'd be courious how you plan to use the stock TPS, I take stock TPS units and strip them to metal and have a Hundyi accent TPS assy presure bonded to the plate so it fits with the stock cover and plug. On the D-jet system the TPS acts simply as an accelerator pump to compensate until the MAP (hand grenade) vains catch up with the vacuum applied to it (note the car WILL run with the TPS unplugged).
Second, Are you reversing the fuel pump relay signal (the D-jet signal to the fuel pump is a negitive signal).

Also, when you start trying to work with the system as it is set up as D-jet wiring you'll learn all the little bitches trying to run the injectors as HiZ, Bosch added a resistor network to the heat sink of the ECU to make them appear that way to the ECU but the injectors are only 1.5-2.3 ohms and run much better at 70% in the PWM circuit in megasquirt programming.

DIY Autotune builds some PnP adapter units for some of the more comon applications but nthing they offered could be adapted to a system as archaic as D-jet.

I've converted 3 d-jet Volvo 1800's and 1 122 wagon that got a B-20 engine swap. The 122 is a daily driver and runs really well. All were done with the MS relay boards and external triggering rather then the new system that utiizes all the factory relays and sensors and really does look like a stock system with the exception of the O2 sensor on the exhaust that plugs into the side of the ECU case at the bottom of the heat sinc.


With regards to Bam's question about the Dizzy. What I do is take a D-jet dizzy and completly disassemble it. I remove the mechanical advance and mounting plate as well as the FI points from the FI points plate.
I mount a Hall Effect Sensor on the FI points plate and machine a 2" disc with 4, 3/16" magnets mounted in it and drilled to recieve the advance pins of the rotor shaft in the approiate position then press it onto the shaft, (the sensor and trigger wheel were the cause of most of the delays as transient noise in the dizzy was an issue that required a special order sensor because of case size needed to fit within the dizzy case and still be removable with FI points plate for service.
At this point you have a dizzy that is direct drive from the cam w/no advance. The spark signal normally sent from the points is an easy change over, simply unplug the trigger wire from the dizzy to the input at the tach. Plug in the spark trigger wire from the MS harness to the back of the tach in its place and, Bam mappable spark.

I'll keep the group informed on dyno results and progress.

Kurt