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In Association with: 

 

 

 

Introduces: 

SMT8Y DIY TUNING MANUAL 

 

 

Table of Contents:   

 

 

 

 

 

 

Page No: 

 

 
1.

 

INTRODUCTION......................................................................................... 1

 

2.

 

HOW DOES IT WORK? ................................................................................ 1

 

3.

 

CALIBRATION ........................................................................................... 3

 

3.1

 

AMP CALIBRATION .............................................................................. 3

 

3.2

 

ENGINE TEMPERATURE CALIBRATION ................................................... 4

 

3.3

 

RPM CALIBRATION .............................................................................. 5

 

3.4

 

TPS CALIBRATION .............................................................................. 7

 

3.5

 

DISPLAY OPTION ................................................................................ 8

 

3.6

 

DYNO (SPEED/DISTANCE) OPTION........................................................ 8

 

3.6.1 

FREQUENCY INPUT ....................................................................... 9 

3.6.2 

PWM INPUT ................................................................................. 9 

3.6.3 

SPEED/DISTANCE INPUT ............................................................... 9 

4.

 

TERMINOLOGY ....................................................................................... 9

 

5.

 

KNOW YOUR ENGINE .............................................................................. 9

 

6.

 

SMT8Y PIN-OUT ................................................................................... 11

 

7.

 

COMMUNICATION WIRING (WITH POWER) .............................................. 12

 

8.

 

POWER WIRING ................................................................................... 13

 

9.

 

STARTING THE PC ................................................................................ 13

 

10.

 

PROFILES: PC SCREEN SETUPS .............................................................. 14

 

10.1

 

PROFILE OPTIONS ............................................................................ 15

 

11.

 

SMT8Y SIMULATION ............................................................................. 15

 

12.

 

BASIC WIRING: RPM ............................................................................ 17

 

Summary of Contents for SMT8Y

Page 1: ...RPM CALIBRATION 5 3 4 TPS CALIBRATION 7 3 5 DISPLAY OPTION 8 3 6 DYNO SPEED DISTANCE OPTION 8 3 6 1 FREQUENCY INPUT 9 3 6 2 PWM INPUT 9 3 6 3 SPEED DISTANCE INPUT 9 4 TERMINOLOGY 9 5 KNOW YOUR ENGINE...

Page 2: ...FR 24 21 INJECTION 24 22 BOOST CONTROL 25 23 IGNITION CONTROL 27 24 APPLICATIONS LIMITING AN AMP SIGNAL 28 25 APPLICATION MODIFYING AN AMP SIGNAL 29 26 APPLICATION MODIFYING THE TPS SIGNAL 30 27 APPLI...

Page 3: ...rofessionals because the terminology is common to all Perfect Power LETRIPP products If you are an experienced engine mechanic then you will find some of the terminology strange and you don t have to...

Page 4: ...olves looking up a number from a table adding it to the looked up number from another table adding it to the input value and output the result SIDE MAP S MAIN MAP TPS RPM 5 1 Signal input 4 Signal out...

Page 5: ...et s assume a linear sensor such as the AMP You need to know 4 values to calibrate it A LOW voltage and the associated LOW pressure A HIGH voltage and the associated HIGH pressure A standard 1 15 bar...

Page 6: ...is what you do Let the engine cool down over night and measure its temperature Let s assume it is 18 C Then use the displayed input reading V at point 6 LOW Input reading 3 5V at 18 C at point 6 Then...

Page 7: ...power com 2016 03 03 5 3 3 RPM CALIBRATION The RPM calibration is a little different You can only specify the LOW HIGH end points Let s assume we use 600 to 6000 RPM and the LINEAR function The same s...

Page 8: ...6 03 03 6 The UNLINEAR RPM scale looks crazy BUT Each RPM step is by the SAME PERCENTAGE higher than the next one Why In this way the change in engine parameters are constant Then there is the CUSTOMI...

Page 9: ...TPS CALIBRATION Each car has a different TPS sensor The calibration is needed to adapt the SMT8Y range to the mechanical range of your sensor The UNLINEAR function is chosen This is the preferred one...

Page 10: ...item from the list for display does not switch the AUX pin to the required configuration This must be performed with the SYSTEM DEF Finally the Display can be switched off which leaves frees the AUX...

Page 11: ...PING The process which results in the signal modification MAPS A bunch of numbers Only one number will be used for mapping SIDE MAPS The same as maps just smaller PARAMETERS Single entry values which...

Page 12: ...knock control at wide open throttle WOT or only during idle and cruising Whenever the active knock control is off you can modify the ignition point Does the engine use Lambda feedback Most engines do...

Page 13: ...I O 1 GROUND GND I 2 GROUND GBD I 3 Bipolar IGN output BIPOUT O 4 NEG CRANK OUTPUT IGOUT O 5 AUX INPUT AUXIN I 6 AFR INPUT OXYIN I 7 ENGINE TEMPERATURE ENGTIN I 8 ANALOG INPUT ANIN I 9 INJECTOR INJEC...

Page 14: ...ER The SMT8Y has a standard RS232 interface For demonstration and for playing with the unit on your desk you can supply power through the RS232 D9 connector as follows RS232 connector PIN 5 NEGATIVE o...

Page 15: ...art your DDS DIRECT software A screen must appear 2 Click on TOOLS Communication and set RS232 115 and a port 1 4 3 You should have communication within 3 seconds 4 If not change the port number or ch...

Page 16: ...installation training guide we have pre recorded Profiles for all tests Of course you can use your own profile or you can modify the presented profile as you like The profiles are accessible through t...

Page 17: ...mulated RPM Simulation Entry in RPM It produces no ignition output signal but the map deflection is affected TPS Simulation Entry in Volt It affects the map deflection and if selected as an analog map...

Page 18: ...licking CONFIG SIMULATION Then Set RPM simulation 2500 Then Set TPS simulation 2 5V Then Set AMP simulation 2 5V Then Set AFR simulation 0 45V Make the Status field visible CONFIG STATUS Confirm that...

Page 19: ...LUS the modification 12 BASIC WIRING RPM The Rpm wiring can be done in two ways A For RPM only B For RPM and ignition modification This section assumes A For RPM purpose only For section B See Ignitio...

Page 20: ...enter 58 For 36 teeth and one gap enter 35 For 12 teeth no gap 12 You may want to change the SYSTEM DEFINITION Neg Crank Edge High Crank level The above screen shows the effect of WRONG settings of E...

Page 21: ...OAD or POWER Tee in pin 15 TPSIN to the available ECU signal Use the TPS test profile Observe that the voltage is INCREASING when pressing the throttle If not open SYSTEM DEFINITION and click INVERSE...

Page 22: ...nition zero mod profile Start your engine and observe that it idles If it does not idle then The wiring is wrong The System definition Neg Crank Edge must change The System definition High Crank Lvl m...

Page 23: ...is the result of the very thin wiring cord which is nice to look at but difficult to work with The address wire Blue must be left open It is used to assign a address to the display if you have more t...

Page 24: ...crank turn For a 60 teeth wheel with 2 missing teeth you enter 60 This setting affects the ignition degrees calculation 17 SUPPLIED MAPS The SMT8Y comes with many maps They are not final pieces of ar...

Page 25: ...new to this don t attempt ignition control as your first job 19 ANALOG AMP Locate the AMP signal wire and cut it Wire the sensor side from the engine to pin 16 Wire pin 14 to the ECU side to the ECU...

Page 26: ...Your engine should run as normal The GREEN cursor indicates where the engine runs Enter a number in this spot let s say 20 and observe that the engine tune changes It works Now you can do calibration...

Page 27: ...r com 2016 03 03 25 Note that the Inject Active is up The unit drives an injector from pin 9 22 BOOST CONTROL Load the file BOOST Load the BOOST profile RPM is not essential You need an AMP input whic...

Page 28: ...wer com 2016 03 03 26 The unit outputs a PWM as indicated on pin9 Inject The PWM On time low is calculated as follows Boost Out Boost PWM Boost Eng Temp Amp input Boost Target Boost Gain Important Sys...

Page 29: ...016 03 03 27 23 IGNITION CONTROL Perform the Ignition wiring Enter a NEGATIVE RETARD number at the green cursor and observe that the engine tune is changing Note Despite wrong setting as follows the u...

Page 30: ...24 APPLICATIONS LIMITING AN AMP SIGNAL You have added a supercharger or turbo to the engine and the engine light comes on as soon as you are boosting The fuelling is done somewhere else Load ZERO map...

Page 31: ...to change the AMP signal down so that the ECU injects less fuel Note This may not be possible at idle because you may exceed the lower ECU voltage limit Perform power wiring Locate and cut the AMP wir...

Page 32: ...erform the BASIC RPM wiring Click System definition TPS Output Load the TPS LIMIT map Load the TPS LIMIT profile With this mod there is nothing above 3000RPM and no full throttle wheel spinning 27 APP...

Page 33: ...y The AMP side table multiplier can t be set to zero The main map has a slight increase towards WOT It can decrease towards 6000 RPM 28 APPLICATION MODIFYING LAMBDA You either want to save fuel or gai...

Page 34: ...l which results in a RICHER operation and more power 29 APPLICATION IGNITION MODIFICATION You have added a turbo or supercharger and need to eliminate knocking Or you are using Ethanol and want to adv...

Page 35: ...a turbo to an engine without de compressing it and need to control the boost This requires a turbo canister of the lowest SAFE boost pressure normally 0 2 0 35 bar The SMT8Y can regulate up but not d...

Page 36: ...s valve thus INCREASING the boost MORE PWM MORE BOOST If the target pressure matches the boost pressure then the BOOST PWM plus the BOOST ENGT PWM are output This is the base line PWM It is modified w...

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