Dynojet 424xLC2: Installation Guide - Manual (Page 132)

C H A P T E R 6
Connecting the RPM Pickup
Above Ground Model 424x/424xLC
2
Automotive Dynamometer Installation Guide
6-6
CONNECTING THE RPM PICKUP
Your Dynojet dynamometer includes a primary wire inductive pickup and two
secondary wire inductive pickups. These small “clothespin like” inductive pickups are
used to sense RPM. An RPM pickup is required if you want to view torque graphs.
Generally you will use one secondary wire inductive pickup on a spark plug wire. The
primary wire inductive pickup senses RPM pulses from the coil. Although this pickup
location generally works better, it is harder to find the correct location to connect the
RPM pickup.
The optional Optical Sensor is useful on diesel powered vehicles, MSD ignitions, and
other high RFI ignition systems. For more detailed information on the Optical Sensor,
refer to the Optical RPM Sensor Installation Guide (P/N 98200044).
Inductive pickups are very fragile. The ferrite core can easily be damaged
and is not covered under warranty. Dropping, snapping, vibration, and
heat can all damage the ferrite core.
The DynoWare RT contains the electronics that sense the RPM pulses.
You will need the following parts:
RPM P ICKUP D ESCRIPTIONS
part description part description
inductive primary
pickup (2)
P/N 76950201
inductive secondary 
pickup (2)
P/N 76950203
RPM pickup description
Secondaries (Non- wasted spark system) Use one secondary pickup. Set the degrees between plug fires to
720° in Power Core.
Secondaries (Wasted spark ignition
system)
Use one secondary pickup. Set the degrees between plug fires to
360° in Power Core.
Primary pickup Attach the primary wire pickup to the primary side of the coil. Set
the degrees between plug fires by taking 720/number of cylinders.
For example, the number of degrees between plug fires on a V-8
engine with a single coil is 720/8=90 degrees.
Optional Optical RPM Sensor Attach the sensor wire to the RPM port on the main module. The
other end of the wire attaches to the Optical Sensor. Set the degrees
between plug fires to 360° in Power Core. Refer to the Optical RPM
Sensor Installation Guide (P/N 98200044).