exhaust pipe. After the boss is attached to the exhaust, tap the threads to clean them and file
the top of the boss to provide a flat surface for sealing.
Install the sensors by lightly coating their threads with a non-lead containing antiseize
compound and tightening to 30 ±3 ft-lbf (40 ±4 Nm). Attach one end of each AFR cable to
each sensor and route the cables to the AFR sensor inputs on the back of the AFRecorder.
Use cable ties to keep the cables away from hot or moving objects and ignition wires. Do not
modify the cables as this may affect the AFRecorder's operation.
During AFR sensor use, observe the conditions outlined in the Important Operation Notes
section on page 5. When an AFR sensor is not being used, an 18 mm spark plug (ex.
Champion D15Y) can be used to plug the hole.
Analog Outputs and Simulated EGO Sensor Outputs
Linearized and programmable 0 to 5 VDC outputs are available for each AFR measurement.
These outputs can be fed into an external data acquisition system. Also available are
simulated EGO (exhaust gas oxygen) sensor outputs with programmable switch points. See
Setup - Outputs - Analog on page 19 and Setup - Outputs - Sim EGO on page 19 for
information on programming these outputs and Output Specifications and Limits on page
36 for the DB15F (Model 4800R) or DB9F (Model 4800P) connector pin assignments.
RS-232 Communication Hook-up
The AFRecorder communicates with an IBM-compatible PC via a serial port cable
connected between the units. The serial port connector on the back of the AFRecorder is a
female DB25 (Model 4800R) or a male DB9 (Model 4800P). The serial port connector on
the back of IBM-compatible PCs is either a male DB-25 (25 pins) or a male DB-9 (9 pins).
A simple "straight through-type" serial port cable with mating ends and of the desired length
is all that is needed for the hook-up.
If a custom-length cable is being made then only the shield ground (use pin 1 on DB25 or pin
5 on DB9), Rx to AFRecorder (use pin 2 on DB25 or pin 3 on DB9), Tx from AFRecorder
(use pin 3 on DB25 or pin 2 on DB9), and signal ground (use pin 7 on DB25 or 5 on DB9)
need to be used.
Features and Hookup 9
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