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SMT8Y DIY TUNING MANUAL
Table of Contents:
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
In Association with:
Introduces:
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Summary of Contents for Perfect Power SMT8Y
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Page 1: Table Of Contents
In Association with: Introduces: SMT8Y DIY TUNING MANUAL Table of Contents: Page No: INTRODUCTION..................1 HOW DOES IT WORK? ................1 CALIBRATION ................... 3 AMP CALIBRATION ................3 ENGINE TEMPERATURE CALIBRATION ........... 4 RPM CALIBRATION ................5 TPS CALIBRATION ................7 DISPLAY OPTION ................ - Page 2 BASIC WIRING: TPS ................19 IGNITION WIRING ................20 DISPLAY WIRING ................. 20 SYSTEM SETUP ..................22 SUPPLIED MAPS ................... 22 MINIMUM INSTALLATION AND WORK ............. 22 ANALOG: AMP ..................23 ANALOG: AFR ..................24 INJECTION ..................24 BOOST CONTROL ................. 25 IGNITION CONTROL ................
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Page 3: Introduction
In most cases the ‘modification’ involves the cutting of a wire (the signal wire) and routing the engine side (source) to an SMT8Y input. Then the signal is modified inside the SMT8Y and presented as an output, which is then connected to ECU side of the cut wire. - Page 4 OUTPUT FIGURE 1. SMT8Y SIGNALS The process by which the SMT8Y ‘modifies’ the signal is called MAPPING. The mapping involves 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.
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Page 5: Calibration
CALIBRATION. CALIBRATION It is a necessary evil requirement. For starters you can ignore it, but eventually you will need to calibrate the SMT8Y for optimum results. AMP CALIBRATION Calibration principle: Let’s assume a linear sensor, such as the AMP. You need to know 4 values to calibrate it. -
Page 6: Engine Temperature Calibration
ENGINE TEMPERATURE CALIBRATION The engine temperature is a little different, because the SMT8Y first LINEARIZES the input voltage. Here 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. -
Page 7: 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. Apply Linear The same scale in UNLINEAR looks as follows: DDS DIRECT – SMT8Y DIY TUNING MANUAL www.perfectpower.com 2016/03/03... - Page 8 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 CUSTOMIZE option: You can type in the complete scale. DDS DIRECT – SMT8Y DIY TUNING MANUAL www.perfectpower.com 2016/03/03...
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Page 9: Tps Calibration
The result of some customization may look like the following: 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, because the airflow changes dramatically with very small butterfly openings. -
Page 10: Display Option
DISPLAY OPTION The SMT8Y has an external display option installed after version 119. This option allows the use of the AUX bin as a display output. For wiring check the BASIC DISPLAY wiring. The AUX output has 4 possible drives as indicated in the drawing below: FIGURE 3. -
Page 11: Frequency Input
PARAMETERS: Single entry values, which influence a process as a whole. SYSTEM DEFINITION: Click on/off points, which influence a process. STATUS: A display, which shows the state of the SMT8Y. KNOW YOUR ENGINE Obtain a wiring diagram from your ECU. This will show you the various engine components. - Page 12 Does the engine use Lambda feedback? Most engines do. There are TWO different exhaust probes: NARROW and WIDE band probes. The SMT8Y has the ability to modify ONE Narrow BAND PROBE. If the answer to these questions is not obvious, then you need to consult a knowledgeable mechanic or consult a friend.
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Page 13: Smt8Y Pin-Out
OXYIN ENGINE TEMPERATURE ENGTIN ANALOG INPUT ANIN INJECTOR INJECT PLUS BATTERY AUXOUT+PULLUP AUXOUT POS. CRANK OUTPUT +IGOUT POS. CRANK INPUT +IGIN ANALOG OUTPUT AOUT TPS (DEFLECTION) INPUT TPSIN AMP INPUT AMPIN DDS DIRECT – SMT8Y DIY TUNING MANUAL www.perfectpower.com 2016/03/03... -
Page 14: Communication Wiring (With Power)
FIGURE 5. SMT8Y BOOST, AUXILLARY OUTPUT DISPLAY COMMUNICATION WIRING (WITH POWER) 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... -
Page 15: Power Wiring
3. You should have communication within 3 seconds. 4. If not, change the port number, or check the port number in the PC. Once you have communication, you can ACCESS the SMT8Y. The following is just an exercise to familiarize your self with the DDS DIRECT operation. -
Page 16: Profiles: Pc Screen Setups
SMT8Y operates, but the way you monitor its behavior. You have to click items on/off, and load a map from the hard drive to change the behavior of the SMT8Y. In Short: Profiles are a convenient way to put the things you want to see on the screen. -
Page 17: 10.1 Profile Options
It affects all AMP readings and maps. If it is selected for analog mapping then the AOUT signal is active. AFR Simulation: Entry in Volt The AFR/Lambda readings are affected. If it is used for analog mapping then the AOUT signal is active. DDS DIRECT – SMT8Y DIY TUNING MANUAL www.perfectpower.com 2016/03/03... - Page 18 Observe that the field indication somewhere in the middle of the tables is set. The exact points depend on your scale calibration. Change the Set Simulation RPM to 3500RPM and observe that the point changes. The following demonstrates an analog signal modification: DDS DIRECT – SMT8Y DIY TUNING MANUAL www.perfectpower.com 2016/03/03...
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Page 19: Basic Wiring: Rpm
Consult the wiring diagram of the ECU to locate the correct wire. If the crank sensor has TWO live signal wires: use any ONE. Tee the +IGIN wire to the ECU signal wire. DDS DIRECT – SMT8Y DIY TUNING MANUAL www.perfectpower.com... - Page 20 This is a good point to calibrate the RPM scale. In the RPM calibration screen enter the bottom and top RPM, and use the choice of linear/un-linear application. For detail see: RPM CALIBRATION. DDS DIRECT – SMT8Y DIY TUNING MANUAL www.perfectpower.com 2016/03/03...
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Page 21: Basic Wiring: Tps
The above procedure works well with a TPS, but not well with an ETC signal. Here is the solution: All ETC have two opposing ‘wiper’ signals. Calibrate the low entry on DDS DIRECT – SMT8Y DIY TUNING MANUAL www.perfectpower.com 2016/03/03... -
Page 22: Ignition Wiring
In these cases you cannot modify the ignition. DISPLAY WIRING The SMT8Y can drive up to 8 external optional displays. The AUX (pin 11) has a multi function purpose, which must be selected with the SYSTEM DEFINITION. See 3.5 for details. - Page 23 2) Put the address wire to +12 within 30 seconds after power up. The unit will display the INCREMENTED address again for 3 seconds. 3) Proceed until the unit has the desired address and then tuck the wire away. 4) The assigned address is now PERMANENT. DDS DIRECT – SMT8Y DIY TUNING MANUAL www.perfectpower.com 2016/03/03...
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Page 24: System Setup
(degrees) calculation. SUPPLIED MAPS The SMT8Y comes with many maps. They are not final pieces of art, but rather a bad attempt to demonstrate a principle. The maps provide a rough start and need to be adapted by the user for the application and the engine. Modify the maps (and the profiles) as much as you can. -
Page 25: Analog: Amp
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, mapping, limiting. DDS DIRECT – SMT8Y DIY TUNING MANUAL www.perfectpower.com 2016/03/03... -
Page 26: Analog: Afr
Connect pin 13 to the crank signal. Anything you can find. While the engine runs check that the STATUS, CRANK ACTIVE comes up. Load the INJECT profile Load the INJECT file You should see the following: DDS DIRECT – SMT8Y DIY TUNING MANUAL www.perfectpower.com 2016/03/03... -
Page 27: Boost Control
The unit drives an injector from pin 9 BOOST CONTROL Load the file: BOOST Load the BOOST profile RPM is not essential You need an AMP input, which is compared to the target (but can do without it). DDS DIRECT – SMT8Y DIY TUNING MANUAL www.perfectpower.com 2016/03/03... - Page 28 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: System definition, Boost Output Status, Boost Active DDS DIRECT – SMT8Y DIY TUNING MANUAL www.perfectpower.com 2016/03/03...
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Page 29: Ignition Control
Enter a NEGATIVE=RETARD number at the green cursor and observe that the engine tune is changing. Note: Despite wrong setting as follows, the unit defaults to RETARD ONLY and the engine runs retarded. DDS DIRECT – SMT8Y DIY TUNING MANUAL www.perfectpower.com 2016/03/03... -
Page 30: Applications: Limiting An Amp Signal
It is limited to -5 degrees Summary: it is possible that the ECU rejects the SMT8Y all together and it is possible that you can do RETARD only if the crank pattern is irregular, or very coarsely spaced. Teeth per turn below 8 may have a problem in advancing. -
Page 31: Application: Modifying An Amp Signal
Wire the ECU side to pin14 Load the AMP REDUCTION map Load the AMP MOD profile If the ECU complains about the low AMP voltage, then you can set the Parameter, Ana.Low.Limit setting to prevent this. DDS DIRECT – SMT8Y DIY TUNING MANUAL www.perfectpower.com 2016/03/03... -
Page 32: Application: Modifying The Tps Signal
This is the only way to get more fuel in to the engine when the injectors saturate, or when increasing the injector flow rate is not an option, or when the increase in fuel pressure is not an option. Perform Power wiring DDS DIRECT – SMT8Y DIY TUNING MANUAL www.perfectpower.com 2016/03/03... -
Page 33: Application: Modifying Lambda
B) The ECU has no or partial closed loop Lambda Perform Power wiring Perform Basic RPM wiring Locate and cut the Lambda wire Connect the engine side to pin6 Connect the ECU side to pin14 Load the AFR MOD profile DDS DIRECT – SMT8Y DIY TUNING MANUAL www.perfectpower.com 2016/03/03... -
Page 34: Application: Ignition Modification
Note: During cruising the SMT8Y adds 0.1 volt. This makes the ECU input RICHER and subsequent the ECU will reduce the fuel, which results in a LEANER operation. At full power the SMT8Y subtracts 0.1V, which makes the signal LEANER. The ECU will then add fuel, which results in a RICHER operation, and more power. -
Page 35: Application: Boost Control
You have added 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 down. Perform Power wiring... - Page 36 TARGET DIFFERENCE times the BOOST GAIN (Parameter). The BOOST GAIN is not critical. If it is too high the pressure will oscillate, if it is too low then the pressure will ‘creep’ up. DDS DIRECT – SMT8Y DIY TUNING MANUAL www.perfectpower.com 2016/03/03...
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