Motec Knock OKM User Manual

MoTeC SKM and OKM User Manual Contents Introduction ... 2Getting Starte

10 Configuration Configuring the channel Knock Voltage y On the Adjust menu click Sensor Setup y Click Input Setup… this will open the Input Pins S

MoTeC Configuration 11 Frequency Analysis A competent tuner with the right equipment can measure and analyse the knock frequency for the specific e

12 Configuration Test 1. Ensure the engine is at normal operating temperature. 2. Run the engine and listen for any irregularities in engine vibrat

MoTeC Configuration 13 Examples The following examples show how to interpret the data and choose the centre frequency. Example 1 In the next spe

14 Configuration Frequency spectrogram in GoldWave

MoTeC Configuration 15 Example 2 The Mitsubishi Evolution Lancer series has a narrowband knock sensor that transmits a signal different to wideband

16 Configuration Log file from ECU with a centre frequency setting of 13 kHz Log file from ECU with a centre frequency setting of 7 kHz This exam

MoTeC Configuration 17 Example 3 The car from the previous example has been converted to rally specifications. This involved fitting a roll cage, l

18 Configuration Tuning Knock Control System Note: The following tuning is a specialised job, to be carried out by experienced technicians. Incorrect

MoTeC Configuration 19 The knock control settings are adjusted in ECU Manager software. • On the Adjust menu click Functions • Click Knock Control

2 Introduction Introduction MoTeC’s Knock Modules provide individual cylinder closed loop knock control, allowing tuners to safely optimise high perfo

20 Configuration Note: Requires the Driver Warning Alarm function to be configured on an auxiliary output. Note: The knock warning is included in Sta

MoTeC Configuration 21 This is added to the value in Retard Limit for the Instantaneous term trim. Unit: Degrees e.g.: Retard Limit = 10, Retard Li

22 Configuration Knock Tuning Tips y Set both Retard Limit and Retard Limit Long Term to 0 degrees. y Listen for detonation while running the engi

MoTeC Operation 23 Operation Once the Knock Control System is tuned, it can be used for continuous monitoring. The configuration will generally no

24 Appendices Appendices Appendix 1 SKM Internal Dip Switch Settings Dip switches are used to set the gain factor, centre frequency and the differe

MoTeC Appendices 25 Differential Mode Switch DM Function off normal knock sensor connection (default)on differential sensors Gain Switches G2 G1

26 Appendices Appendix 2 SKM Connector, Pin Out and Wiring Connector Autosport 13 pin Mating connector #65041 SKM Connect to Pin Function

MoTeC Appendices 27 Appendix 3 SKM Tuning Loom #61114 Optionally the SKM Tuning Loom can be used for wiring. • Length of the ECU and knock sensor

28 Appendices

MoTeC Appendices 29 Appendix 4 Gold Wave Settings To set up the side display as a Spectrogram for analysing frequency of sounds: On the Options m

MoTeC Introduction 3 Other information SKM OKM Compatibility y ‘hundred series’ ECUs; M400, M600, M800 and M880 y All knock sensors y M800 Pl

30 Appendices On the Tool menu click Control Right click in the screen to open the menu and select Spectrogram <GoldWave*> Click Properties t

MoTeC Appendices 31 Appendix 5 Detonation Explained Detonation (also called "spark knock") is an erratic form of combustion that can caus

32 Appendices Combustion chamber at TDC Abnormal Combustion – Detonation If conditions for combustion are not ideal, detonation can occur. This usu

MoTeC Appendices 33 Detonation causes a very large, very rapid, pressure spike of very short duration in the combustion chamber. The pressure trace

34 Appendices microscope the small holes are not unlike those found in Swiss cheese. The detonation actually mechanically erodes material out of th

MoTeC Notes 35

36 Notes

4 Getting Started Getting Started The Knock Modules have no stand-alone Manager software. All knock control configuration is done through MoTeC'

MoTeC Installation 5 Installation SKM The SKM is connected between the OEM fitted knock sensor and a 'hundred series' ECU – M400, M600,

6 Configuration Configuration When suffering detonation, each engine/chassis combination and associated accessory package resonates at different freq

MoTeC Configuration 7 With increasing engine RPM, the higher engine vibrations will result in an increase in the amplitude of the knock sensor si

8 Configuration The knock module filters and amplifies the signal transmitted from the knock sensor based on the centre frequency. Signals of the sel

MoTeC Configuration 9 Preparation Configuring the Knock Window y On the Adjust menu select injector/ignition output functions y Select injector/ign