Drag Racing Data Loggers

FXL22 Drag racing data logger

FXL22 Off Market (24 July 2006)


The FXL22 is a 22 Channel Data Logger designed specifically for V8 engines used in Group 3 drag racing. The logger monitors up to 4 switching inputs standard and up to four rpm's standard. Optional sensors are required if the vehicle uses a magneto or a manual transmission. It monitors battery volts standard. There are 6 unused 0 to 5 volt analog inputs available for future use.

It can log:

Four switch positions:

Wide Open Throttle - Standard. This triggers the recording.
Two Step or Transbrake - Standard. Voltage seeking. This is the primary Record Inhibit line.
Two Step - Earth seeking, like the old Dyna ignitions and new MSD ignitions. This is the secondary Record Inhibit line.
Shift Light - Standard, but only for 12 volt bulb shift lights. Records when the shift light is on. May not work with LED shiftlights.

Four rpm's:

Engine RPM from the tacho terminal of an MSD ignition - Standard.
Transmission Input Shaft RPM - Optional for Manual Transmissions.
Drive Shaft RPM - Sensor and collar supplied standard.
Right Hand Front Wheel Speed in MPH - Sensor and 5 magnets standard.

Magneto equipped engines usually need the optional crank pickup and magnet kit.

images/rpm_2 collar_1

RPM pickup and untrimmed four magnet collar.

Battery Volts Monitoring is standard and monitors the voltage supplied to the logger.

Pressures: Up to four optional pressure sensors can be added. The customer may choose from a combination of up to four high quality, high accuracy stainless steel pressure senders.

Stainless Steel pressure senders: Obsolete.


0 - 200 psi Normally used for fuel injection pressure.
0 - 100 psi Normally used for boost pressure.
0 - 50 psi May be used for boost pressure or carby fuel pressure.
0 - 25 psi Absolute. This pressure sender monitors from total vacuum to 10 psi above atmospheric. It can be used for up to four separate functions, although not at the same time. It can be used to monitor scoop pressure, fuel pressure up to 10 psi, sump vacuum and plenum vacuum. If you run a normally aspirated engine, then this is the one pressure sender you should have, particularly to monitor scoop pressure. If the scoop can make 1 psi of pressure, then you will get 7 percent more power. Pro Stock cars can get this at 170 mph. This is why some cars can overhaul others at the top end.

Pressure senders are NOT covered by any form of warranty.

Cables: The system comes with a wiring harness cut to the customer requirements, 1.5 meter downloading cable to connect the logger to a lap top and DOS based software for downloading the data and viewing the graph. The customer is required to quote the cable lengths from a list. See the list in the Before You Buy page. There is an optional 10 meter long Downloading Cable if the customer will be keeping the computer in the trailer rather than having to mount the computer beside the logger for downloading. This cable is $X if purchased separately or an extra $X if selected as an option rather than the 1.5 meter Downloading Cable.

Sample Rate: Sample rate is 100 samples per second. Recording time is 18.88 seconds triggered from the Wide Open Throttle switch when the two step or transbrake is released. This lines up the start of the race with the Time Zero on the Graph. There is a small portion of the recording ( 1.60 seconds ) left behind the Time Zero, which means the total recording time is actually 20.48 seconds.

Prices: Price starts at $ OBSOLETE OFF MARKET and this is for a fully working system to suit a race car with an MSD electronic ignition and an auto trans.

This includes:

Technical Specifications: 24 July 2006

RPMs: Up to 4. Only Hall Effect Switches are used as these have a high immunity to RF interference. These Hall Effect Sensors are only triggered by the South end of a magnet. Engine rpm can also be monitored if the vehicle has an MSD or Dyna or similar ignition with a tacho terminal. The logger can pick up from the tacho terminal, saving the cost and difficulty of mounting a sensor and magnets to the crank. Input shaft rpm sensing can be done on a manual transmission.

Switch Monitors: Up to 4. Wide Open Throttle is essential to trigger the recording. The others are two step or transbrake monitor which is used as 'Record Inhibit' so the vehicle can go to Wide Open Throttle on the line, but not trigger the recording. A +12 volt shift light can be monitored as can a spare input, usually for a nitrous solenoid. On the FXL22, this input is an earth seeking inhibit line to suit Dyna Ignition two steps.

Thermocouples: Up to 8 K Type ( Yellow Connectors ) isolated from earth. Only open tip thermocouples are used.

Pressure Senders: Up to 4. The FXL22 only supports the stainless steel senders.

Main module Connector pinouts.The FXL22, FXL25, FXL32 and FXL35 have one common connector which is where the RPM and Switch loom plugs in. This is a 25 pin ' D ' connector. Note that the FXL22 uses +5 Volts DC for its switches and rpm pickups and the FXL25, FXL32 and FXL35 use +9 Volts DC. The FXL32 and FXL35 are derived from the FXL25 and only one pin is different, that is Pin 10. On the FXL32 and FXL35 it was decided to make it an earth seeking record inhibit, the same as the FXL22, so it can accommodate early Dyna ignitions and late MSD ignitions which have earth seeking two steps.

The Four RPM cables will have heat shrink tubing for insulation and identification. The color corresponds to the color of the traces on the DOS based software.

Pin Function: ( Viewed from behind the connector where all the wiring comes out )

FXL22 Analogs Connector Pinouts:

This is a 15 pin Dee connector.

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