SR20 Engine

SR20 Engine

The Nissan SR20DET and DE engine

SR20DET Turbo
 

SR20DE Aspirated




Haltech ECU Options

ECU ModelPlug In AvailableOEM Functions Not SupportedSuitable Installation TypeSupport Sequential and/or Direct Fire Ignition
Platinum Pro S15
S13X,S14s2,S15AUDM,S15JDM
S13 with wiring modifications
-
Standalone
Yes
Elite 550NoYes
Elite 750NoYes
Elite 950NoYes
Elite 1000Yes-StandaloneYes
Elite 1500Yes-StandaloneYes
Elite 2000Yes-StandaloneYes
Elite 2500Yes-StandaloneYes


Platinum Pro S15: For those looking for a budget ECU that runs all factory functionality but does not require the latest ECU features.
Elite 550: For a basic installation to just run the injectors, ignition, and maybe a couple of outputs.  More used for a cheap engine conversion.
Elite 750/950: As above however Long Term Learning of Fuel, Datalogging to internal memory, or flex fuel are required features.
Elite 1000: When a plug in adapter kit is used or when all of the vehicle needs to be supported.
Elite 1500: As above with added advanced functionality
Elite 2000/2500: As above but looking for more injector outputs or just more outputs in general.




General Information


Cylinders4
Displacement1998cc
Firing Order1,3,4,2
Cylinder OrientationCyl1 front, Cyl4 rear





Model Variants

There are various models of the SR20 engine.
SR20DE refers to naturally aspirated variants.  These all have distributor ignition and come with either red or unpainted rocker covers.
SR20DET refers to turbocharged variants.  These come in common variants listed below.

Common Turbo Models
SR20DET Variant
Identifiers
S13 Silvia/180SX
Red flat rocker cover. Direct Fire ignition.
U13 Bluebird
Red flat rocker cover. Distributor ignition. Small intercooler attached to engine over intake manifold.
N14 Pulsar GTIR
Red flat rocker cover. Distributor ignition. Larger intercooler covering intake manifold and rocker cover. ITB intake.
S14 200SX
Variable cam with humped rocker cover. External igniter module.
S15 200SX
Variable cam with humped rocker cover. Smaller ignition coils with internal igniters.







Sensor Information

Crank/Cam Sensor (CAS)

There are a couple of different types of triggering systems found on SR20 engines.  There are the Distributor models most found on NA car, and there are the CAS type units found on Direct Fire equipped engines predominantly turbocharged.
There is also a different way the patterns can be described.  Nissan often calls the 360x signal a "1 degree" and the 4x signal a "180-degree".  Interestingly the 1 degree signal has 360 slots for 720 crank degrees. 

S13, S14, S15 CAS
   




PinDescription
Haltech Connection
1Signal Ground
Signal Ground (Blue in Trigger 4-core)
212V+ Switched
12V+ (Red in Trigger 4-core)
3360x (Home+)
Home+ (Yellow in Home 4-core)
4
4x (Trigger+)
Trigger+ (Yellow in Trigger 4-core)

Trigger/Home Wiring Hack

For applications where there is a dual Hall Effect pickup in a CAS or Distributor there is a quick wiring hack that allows the Home+ signal to be incorporated in the Trigger 4-core shielded cable.  This can make the wiring much cleaner and easier.  

To do this we will be relocated the wiring at the ECU Connector so that the unusued Trigger- wire is instead placed onto the ECU pin for Home+.  This means that the Trigger 4-core cable now has 12V+, Ground, Trigger+ and Home+ all in the one cable.   The GREEN wire that is labelled at Trigger- is now actually the Home+.

For Elite 550/750/950 models
1. Unplug the Main Connector at the ECU end.
2. Unlock the connector by pushing in the large white tab on the connector until it clicks. This will cause the two smaller white tabs to pop up on the other side.
3. Remove the Yellow Home+ wire from pin 32.  Insulate this wire, it will not be used.
4. Remove the Green Trigger- wire from pin 33 and move it to pin 32.  Push it all the way until you can see the metal pin clearly from the pin side of the connector and it looks the same as all other pins.
5. Lock the connector by pushing back down the 2x white tabs until they click into position.

For Elite 1000/1500/2000/2500 models
1. Unplug the smaller 26-pin Main Connector at the ECU end.
2. Unlock the connector by pushing in the large white tab on the connector until it clicks. This will cause the two smaller white tabs to pop up on the other side.
3. Remove the Yellow Home+ wire from pin 2.
4. Remove the Green Trigger- wire that is in pin 5 and move it to pin2. Push it all the way until you can see the metal pin clearly from the pin side of the connector and it looks the same as all other pins.
5. Lock the 26-pin connector by pushing back down the 2x white tabs until they click into position.


Trigger Configuration - Direct Fire Models








Distributor

There is more than one type of distributor.  Some have an internal ignition coil, others have an external coil.

Internal coil type wiring
PinDescription
Haltech Connection
1ECU Ignition Output #1
Ignition Output 1
2Power Ground (To Head)
---
3360x
Home+ (Yellow in Home 4-core)
4
4x
Trigger+ (Yellow in Trigger 4-core)
5
12V+
12V+ (Red in Trigger 4-core)
6
Signal Ground
Signal Ground (Blue in Trigger 4-core)

PinDescription
Haltech Connection
712V+ Switched Coil +
---
8No Connection
---

Trigger/Home Wiring Hack

For applications where there is a dual Hall Effect pickup in a CAS or Distributor there is a quick wiring hack that allows the Home+ signal to be incorporated in the Trigger 4-core shielded cable.  This can make the wiring much cleaner and easier.  

To do this we will be relocated the wiring at the ECU Connector so that the unused Trigger- wire is instead placed onto the ECU pin for Home+.  This means that the Trigger 4-core cable now has 12V+, Ground, Trigger+ and Home+ all in the one cable.   The GREEN wire that is labelled at Trigger- is now actually the Home+.

For Elite 550/750/950 models
1. Unplug the Main Connector at the ECU end.
2. Unlock the connector by pushing in the large white tab on the connector until it clicks. This will cause the two smaller white tabs to pop up on the other side.
3. Remove the Yellow Home+ wire from pin 32.  Insulate this wire, it will not be used.
4. Remove the Green Trigger- wire from pin 33 and move it to pin 32.  Push it all the way until you can see the metal pin clearly from the pin side of the connector and it looks the same as all other pins.
5. Lock the connector by pushing back down the 2x white tabs until they click into position.

For Elite 1000/1500/2000/2500 models
1. Unplug the smaller 26-pin Main Connector at the ECU end.
2. Unlock the connector by pushing in the large white tab on the connector until it clicks. This will cause the two smaller white tabs to pop up on the other side.
3. Remove the Yellow Home+ wire from pin 2.
4. Remove the Green Trigger- wire that is in pin 5 and move it to pin 2. Push it all the way until you can see the metal pin clearly from the pin side of the connector and it looks the same as all other pins.
5. Lock the 26-pin connector by pushing back down the 2x white tabs until they click into position.



Trigger Configuration - Distributor Models














Ignition Coils

There are also a number of different ignition coil types that were used on SR20 engines.  All use Constant Charge with a Falling edge.

S15 with internal igniter

PinDescription
IBECU Ignition Output
GGround (to head)
+12V+ Switched


S13 and S14 with external igniter

PinDescription
-Igniter Module Trigger
+12V+ Switched
EGround (to head)


S13 and S14 Igniter Module Wiring

PinDescription
i1ECU Ignition Output #1
i2ECU Ignition Output #2
GGround to Cylinder Head
i3
ECU Ignition Output #3
i4
ECU Ignition Output #4
e1
Coil #1 -ve
e2
Coil #2 -ve
e3
Coil #3 -ve
e4
Coil #4 -ve


Dwell

Suggested dwell time for Nissan Coils
















Throttle Position Sensor

There are two common types of Throttle Position Sensors found on these engines.  The 3-pin type and the 6-pin type.

3-pin type




PinDescription
1Signal Ground
2Signal
35V+


6-pin type

Use the brown connector for direct wiring to ECU


Grey
PinDescription
15V+
2Signal
3Signal Ground
Brown
PinDescription
1Signal Ground
2Signal
35V+














MAP Sensor

These engines do not come with a MAP sensor. Some vehicles have a pressure sensor for a gauge however this is not wired to the ECU and cannot be used.
Use the internal MAP sensor that comes with your ECU.  For higher boost levels an external MAP sensor should be used instead.















Idle Valve

SR20 engines come with a 2x separate 2-pin BAC idle valves. These only require a 12V+ power source that is switched with ignition power, and any spare ECU output.
Only the larger solenoid is connected to the ECU, and this is a duty pulsed type solenoid where more duty opens the valve to give a higher idle speed.
The smaller solenoid is a switched type that is used anytime the A/C clutch is engaged. This is not wired or controlled by the ECU.


Solenoids are not polarity dependent
PinHaltech Connection
A12V+ Switched
BAny spare ECU output

See base maps for configuration information













Coolant Temperature Sensor



Wiring is not polarity sensitive

Calibration: Use "Temperature - Nissan S15 Coolant.cal"
Created for Haltech ECUs using a 1k pullup to 5V












Air Temperature Sensor

Most SR20 engines do not come with an ATS. Only the GTIR engine has this sensor from the factory.  A sensor needs to be installed when you are using a Haltech ECU

Haltech 1/8" NPT Air Temp Sensor


Wiring is not polarity sensitive.

Calibration: Use "Temperature - GM Air Sensor.cal"
Created for Haltech ECUs using a 1k pullup to 5V











Knock Sensor

OEM Knock sensors are polarity dependent. They also internally link the ground to the engine block which is bad for signal ground integrity and it is recommended to exchange the sensor for a Haltech unit. In the Nissan wiring there is no connection to pin 1.



PinHaltech Connection
1No Connection
2Signal (Knock 1)











MAF Sensor

Although most users of Haltech ECUs will be deleting the MAF, it is possible to use a MAF if you prefer.

S15 MAF
  

Pin letters are written on the sensor
PinDescription
ANo Connection
B12V+ Switched
CSensor Ground
D
Signal 0-5V

















OEM ECU Information

S13





S15














Base Maps

Base maps have been created for use with the Haltech Elite Adapter Harnesses and these are included in the ESP Software package.  Platinum Pro base maps also come with the ECU Manager Software package.

To use these maps they should be IMPORTED into your ECU.  Follow the IMPORTING A BASE MAP guide.




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