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Contents Introduction ensnare Tire Monitoring System: Overview System requirements installation Installing the TMS receiver installing the TMS receiver antenna .. Fitting TMS wheel fixtures Removing and checking TMS wheel fixtures Cleaning the Transmitter assembly cap... Calibration and testing... Calibrating TMS channels debug channels Testing TMS transmitters Using the Tire Monitoring System Specifications... TMS transmitter . TMS receiver .. Dimensions... TMS whee fixture THS wheel bolts TMS receiver ..
Safety information The Fi Tire Monitoring Stern (TMS) is designed to be fitted and used with specially modified wheels. Modifications to wheels must only be made by the wheel manufacturers and approved by the relevant motor sport regulatory authorities. Under no circumstances must wheel modifications be carried out by anyone other than the wheel manufacturers. Pi Research do not take responsibility for use of the Tire Monitoring System when fitted to non-approved modified wheels.
Introduction The setup of a high performance race car is very sensitive. The rolling radius of a tire is critical fo the ride height and consequently, the aerodynamic performance and balance, The speed at which a car can comer is a function of the lateral and vertical stiffness of the tire, and the physical properties of the tread rubber. Some of the stinginess is generated by the inflation pressure holding the sidewall in position.
Tire Monitoring System: Overview BL wheel fixture sateen FL hse texture -m ‘ AR wheel fixture TMS receiver FB wheal fixture The Tire Monitoring System comprises a car mounted radio receiver and four wheel fixtures {transmitter assemblies) Transmitter assemblies Each transmitter is powered by two lithium batteries. To increase battery life, transmission only occurs when whee! motion is detected.
To make it easier to relate TMS wheel fixtures to wheel position they are color-coded. The following table details the position and coral of TMS wheel fixtures. Wheel positions are as the driver would see the wheels when seated in the car. Sheet TMS whee! fixture label Label color Rear right 0168-05038 1-RR white Rear loft 01B-050391-RL yellow Front left 01B-050391-FL.
System requirements To use the Tire Monitoring System you need ane of the following: Pi System 3+ programmed with box code and ECM driver that supports the Tire Monitoring System, Pi System 4+ programmed with box code that supports the Tire Monitoring System. # Pi System 5s1an or Motor Racing Computer (MRC) programmed with customer specific code, and correct communication ports. A non-Pi system with four 0-8 analog inputs. Additionally you need: Pi Analysis software that supports the Tire Monitoring System.
Installation installing the TMS receiver When installing the TMS receiver: select a position where the TMS receiver will nol be in constant contact with water, fuel, or oil; + protect the TMS receiver from vibration by mounting the it using anti vibration mounts or Velcro®; make sure that TMS receiver will not be affected by heat soak; try not to position the TMS receiver near sources of electrical interference @.4.
Installing the TMS receive ver antenna Ground planes The TMS receiver antenna needs a suitable ground plane to operate efficiently. The ground plane is a conductive material placed al the base of the antenna to increase its efficiency. Generally, the construction and shape of a race car does not allow for a suitable ground plane. To use your Tire Monitoring System effectively you may have to make a suitable ground plane.
4. Tighten the antenna and antenna feed cable to the bulkhead connector, and refit the panel. Anton insulating washer . THC outshout connector body pang! tars tape copper fol Insulating waster : locking washer Fixing rut NG terminated feed cable Antenna installation detail Yo tit the antenna to carbon fiber chassis panels: 1. Locate a suitable panel that can be removed easily for access to the antenna. 2. Make a bracket from metal or carbon fiber that will hold the antenna vertical.
6. Ensure that the copper foil does not make contact with any part of the chassis that is likely to conduct. 7. Drill a hole in the panel for the antenna to pass through. Antenna feed loom If you are going to use your own antenna feed loom, it should be a high quality coaxial cable wile a stranded inner core. Pi recommend that you use 50 ohm REORG coaxial cable. For best results, use crimp TNC connectors at both TMS receiver and antenna ends of the feed cable.
Fitting TMS wheel fixtures Each wheel fixture consists of three important components: # the transmitter assembly, # a coated Downy washer, and # a TMS wheel bolt ding cavity dido antenna TIS wheel bol wheel rim CE Downy washer oe cap . transmitter assembly . spoke wheel hut Section through whit shewing typical location of TMS wheel fixture Each wheel must be specially machined to accept a TMS wheel fixture. Wheels may be supplied fitted with TMS fixtures or you may have to fit them yourself.
To fit a TMS wheel fixture to a wheel: Remove the tire from the wheal. Thoroughly clean and dry the hole allocated for the TMS wheel fixture. Choose the correct bolt for the thickness of the wheel rim. {See page 32.) Place the wheel bolt into the hole in the wheel! rim. The bolt head should be an the tire cavil side of the wheel rim.
WARNING: The antenna is exposed and can be easily damaged. The tire should be fitted by starting at a point opposite to the position of the transmitter. 10. Send the wheel to have the tire fitted and balanced. 11. inflate the tire using dry nitrogen and leave for a minimum of six hours. This time also allows the Loctite® 242 10 set 12. Check the tire for teaks and deflation. 13. If no leaks are found, adjust the inflation pressure to normal working pressure.
Checking the cap seal After each practice or race session you should remove the TMS wheel fixture from the whit and examine the paint spot for signs of the cap loosening. If the paint spot has cracked then the cap must be removed, cleaned, resealed, and tightened To reseal the cap: 1. Carefully remove the cap from the transmitter sacs, 2. Clean the threads of the cap and transmitter case to remove any Loctite® 242, 3.
3. Hold the thread cleaning tot in a vice, with the threads on the tool pointing upwards transmitter semi ¥ 12" wrench transmitter . assembly cap sot . thread cleaning too compressed air canonization point Using the thread cleaning toot 4. Carefully feed the antenna of the transmitter assembly into the hole down the center of the thread cleaning tool, Turn the transmitter assembly so that the threads in the cap just catch the threads on the thread cleaning tool.
Calibration and testing Calibrating TMS channels Choosing a channel to calibrate 1. Make sure that you have connected the TMS receiver to your data logging system i you are using the four analog outputs of the TMS receiver, decide which channels you are going to use. and plug them into the appropriate inputs of the data logging system. 2. Switch on your computer. Locate and start the Version 6 Setup application. 3. Power your data fogging system. 4.
Changing channel parameters The first step in calibrating a channel is to change the channel parameters. Ham THA G68 0 None Peter og [EBERT TT 1p FoF © Attention channel prelims Pat busied son seeings i ETT pi 7 Un TTT paces, [ETT ge ! Gop [6 twos © Guo [7 suo ‘Bow Chanel streetlight ave canned settings I og [EEE gy 1 DaskiBidgla Set ash Dishrag Setting eis Ufa pres deafen pen Cord ET] cee Changing channel parameters {or 88-422 TMS pressure channels To change channel parameters: 1.
The following table gives details about TMS pressure channels. index Default channel name Function 580 TMS \SUB ¢ FL pressure 861 TMS NSB 1 FR pressure $82 TMS 28JB 2 RL pressure 583 TMS SJB 3 RR pressure 4. Select Units and enter PSL Set the Precision to one decimal place 6. Define the measurement range of the sensor by entering a maximum of 95.5 and a minimum of 0 {zero} for the calibrated channel settings. @ NOTE: Remember that 95.5 PSI is the value displayed during a fault condition or during fear mode.
To enter and y-coordinates using the keyboard: 1. Make sure that a Calibration window is open. 2. Ensure that "Manual ADC Count” is checked {v'} in the Calibrate menu 8. Choose the Ins bunion or press (lose). In the Coordinate Entry dialog, enter the y-coordinate for 0 PSI from the table above. The Coordinate Entry dialog box reappears requesting an x-coordinate. 4. Enter the x-coordinate for 0 PSI from the label above. 5. Choose the Ins button or press (insert.
Pen S500 Fao ~ ate EEE me ne 0 Calibration Negative Sense 8 30300 its Calibration window for 2 TMS pressure channel To save a calibration: 1. Choose “Close” from the control-menu box 2. Choose Yes to save the calibration and return to the Setup application. Choose No lo return to Setup application and make no changes to the calibration.
RS-422 debug channels The serial data stream from the TMS receiver includes four debug channels that can be used to test the operation of the Tire Monitoring System. The following table gives details about TMS debug channels. index Default channel name Function Calibration 887 SJB Tern temperature no calibration $54 TMS #4848 4 FL debug no calibration 585 TMS 5\8JB 5 FR debug no calibration $886 TMS 6\SUB 6 Rt debug no calibration 887 TMS "SJB 7 AR debug no calibration The 8-bit temperature message contains
Tess ing TMS transmitters To test a transmitter tutted to a wheel not fitted to a car: Make sure that the TMS receiver is connected and functioning correctly. Power your data logging system Plug the download lead from the computer into the download connector of the data logging system Make sure that you have established a communication connection using the Server application. If you are using the Pi Dd the red LED should illuminate to confirm that it is powered. 5.
9. Place a protective mat on the floor. 10. Rotate the wheel until the wheel fixture is close to the floor. 11. Raise the whee! 6" (150mm} keeping the sides at right angles to the floor, 12. Release the wheel and bounce it on the protective mat for 20-30 seconds. The channel values should read 95.5 PSI for 2 seconds, and then return to a reading of 80 PSL wheel fixture 6° 150mm) Bouncing a wheel fo test transmitter operation To test a wheel transmitter fitted to the car: 1.
Using the Tire Monitoring System Pr-race and per-testing The Tire Monitoring System is a safety device and therefore should be fitted and treated with care. The environment in which it is designed to work is harsh and it is important that the system is checked frequently. In particular: Crack test tha TMS wheel bolts before high speed races such as super speedways.
Multi-car teams if you have more than one car fitted with the Tire Monitoring System then the learn mode enables the receiver to learn about the transmitters fitted to its car without interference from other cars in the sear team identifying non-learned or failed transmitters If your Tire Monitoring System is sending data to the logging system using the RS-422 communication link then a non-learned or failed transmitter can be identities by an inflation pressure of 80 PSI.
Sudden loss of inflation pressure The TMS receiver is set so that if the inflation pressure changes by more than +5 PSI the receiver double-checks the value by waiting 1.25 seconds for the next pressure reading before sending pressure data to the logging system. This feature can be disabled by a request to Pi Customer Support Wheel fixture temperature The transmitter electronics in each TMS wheel fixture have an operating temperature range of between +40°F and +248°F (+10°C and +120°C).
Specifications TMS transmitter Description Operating voltage Voltage source Battery life Pressure measurement range Resolution Accuracy Maximum over pressure Transmission frequency Transmission range Temperature range {operating} {storage} Weight Value 8 volts DGC nominal Lithium batteries 50 hours (operating) § months {storage) 0-635 PSI 0.
TMS receiver Description Operating voltage range Operating current Resolution and accuracy Analogue voltage output Quip impedance Communication interface Operating temperature range Weight Environmental Receiver connector types Description System connector Antenna Receiver connector pin details Pin Description Power OV Power 9-18V DC TMS to Pi System (A)! TMS to Pi System (8) Signal OV Pi System to TMS (A) Pi System to TMS (B)" EE NA ¥ According to EIA RS-422 specifications Pin Value 10-18Y DC 10mA determin
Dimensions TMS wheel fixture wheel bolt antenna 0.507 AF HEX cap transmitter case a8" Dowdy washes 0.88" AF HEX SER bo f soe paint spot 110.0 (4 20% ou F292 90% .
TMS wheel bolts TMS wheel bolts are available in two lengths, which are shown in the next table Dimension fis the thickness of the wheel material, Dimensions are shown in millimeters and inches. thread 3/877 fli Part Number Color 10B-050867 10.16 + 0.02") Black 10B-050368 0.027) Green TMS receiver oh : . M25 for Benin (0.2) 2601), L002) . #60(18Y . 89.4357 . . 9200367 . . 1080 (4.27 .
Parts numbering HP TMS kit 1 {Part number 308B-050381} Description HP TMS wheel fixture (RR) HP TMS wheel fixture (RL) HP TMS wheel fixture (FL) HP TMS wheel fixture (FR) HP TMS receiver TMS long bolt or TMS short bolt* TMS case and accessories * Selected at time of order Part number 018-050391-RR 018-050391-R.
HP TMS kit 2 (Part number 308-050382) a SH Description Part number Quantity HP TMS wheel fixture (RR) 01B-050381-RR 6 HP TMS wheel fixture (RL) 01B-050391-RL. 6 HP TMS whit fixture (FL) 018-050391-FL 8 HP TMS wheel fixture (FR) 01B-050381-FR 6 HP TMS receiver 018-050393 1 TMS long bolt 108-050367 24 or TMS short bolt 108-080369 24 TMS case and accessories 13B-050395 1 * Selected at time of order.
HP TMS case and accessories (Part numb. 138.050395) Description Part Number Quantity Car antenna 01A-049085 1 Antenna extension loom 03100503 1 TMS custom socket 108-050256 1 TMS thread cleaning tool 10B-050297 1 TMS sealing ring 108-050389 50 HE TMS Application Note 208-071223 1 Antenna mounting kit 30C-049087 1 Loctite® 242 thread lock 328-0023 1 HP TMS Application Note 208-071223 1 Refurbishment and repair details Faulty Tire Monitoring System equipment should be returned to Pi Research.
Contact information For more information about Pi products and details of worldwide authorized agents, please contact: Pi Research Limited Brooklet Motor sports Center Twenty pence Road Hottentot CAMBRIDGE UK Customer Support Tel +44 (0) 1954 253600 ©B4 8PS Fax +44 {0} 1984 253601 Pi Research, Inc. 8250 Haversack Suite #275 Indianapolis iN 46240 Tel +1 {317} 259-8500 usa Fax +1 (317) 269-0137 Part Number: 298-071223-2 Issue 2.