DC-Boxes
In 1969, Porsche adopted a Capacitive Discharge ignition system that used the points for switching only. This was a major upgrade and made these engines run much better and less finicky to drive. Plus, the plugs and points lasted much longer.
3-pin and 6-pin DC-boxes of Raceservice4u are new built in a Bosch style die-cast case. All electronic parts and circuit board are like original specifications or better. The construction allows replacement of components in case of damage for whatever reason.
3 pin boxes work only with contacts. One contactset for 2 boxes or 2 contact sets for 2 boxes.
6 and 8 pin boxes are only for contactless distributors. One signal can trigger 2 boxes.
Most 40 year old original boxes suffer of bad performance at high revs and temperatures higher than 60 degrees. In most cases it is the thyristor and condensor. Or corrosion of parts. connections and circuit board.
You can have to less spark energy for firing the mixture above 6500 RPM. For road cars is that OK but not for a
race car. It is therefore advisable to bring in your 3/pin and 6/pin boxes for
service.
Rev limiter built in all type of boxes is possible.
The 8-pin is not only bigger, has more components and connections, but
the performance is far better than the 3 or 6 pin box. With increasing RPM the
8-pin the spark will have a constant energy up to more than 9000 RPM. The speed in which
the spark starts and reaches its maximum is faster than with the 3 or 6 pin
boxes. Important is the spark energy see above a graphic for the difference
between the Bosch boxes.
The coils
Raceservice4u has black coils made in USA .
The silver canBosch coil made in Brazil are coils with many problems; as you find them on many
internet forums.
The ratio is 1/100 and produced spark energy depends on the energy (mJ)
delivered by the CD-box.
- High Performance, Canister type Coil small length and colors like the original Bosch Coil.
ˇ Epoxy Potted for High Vibration
ˇ Inductance: 8 mH
ˇ Primary Resistance: 0,7 Ohms
ˇ Turns Ratio: 100:1
ˇ Secondary Resistance: 139 Ohms
ˇ Maximum Voltage: 45,000 volts
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The Raceservice4u coil Specifications;
Wireloom
The in house produced wireloom is made with wire shield wires for
reduction of interference with the Plug wires. The wireloom is made for best
possible positions of the CD-boxes and coils.
Raceservice4u advice to use the same positions in the engine bay as was
used in the time period. With this
layout the signal cables will be as far as possible away from the Plug wires to
prevent interference between them.
The Plug wires are made of 8mm double isolated, suppressed cable with
spiral core.