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- | Buy [[MegaSquirt]] II fully assembled ($400). | + | Buy [[MegaSquirt]] II (or MicroSquirt 2) fully assembled about $400 USD or [http://www.ebay.com.au/sch/i.html?_odkw=Megasquirt+2&_nkw=Microsquirt+2&_sacat=0 $500 AUD off eBay]. |
- | Obtain an A14 or A15 [[EGI]] factory Datsun fuel injection manifold. Make sure it has the factory rising rate regulator and fuel injectors included and the factory throttle body. | + | = Manifold and Injectors = |
+ | Obtain an A14 or A15 [[EGI]] factory Datsun fuel injection manifold. | ||
+ | |||
+ | {{Album|8104}} | ||
+ | |||
+ | Make sure it includes: | ||
+ | * the factory rising rate regulator and fuel rail | ||
+ | * the fuel injectors included | ||
+ | * the factory 2-pin water temp sensor | ||
+ | * the throttle body. The Factory one is good for 92 hp | ||
+ | * the air regulator. It will run without this if you want to hold your foot on the throttle while engine is warming up to 120F/45C | ||
Everything else may be removed from the manifold. | Everything else may be removed from the manifold. | ||
* if you remove the EGR passage, fit a blocking plate | * if you remove the EGR passage, fit a blocking plate | ||
- | * the only vacuum hoses needed are the one to the regulator, and one from the throttle body yo the distributor | + | * an O2 sensor is not required |
+ | * TPS is not needed | ||
- | With MegaSquirt you won't need the Datsun airflow meter. Instead, Megasquirt will calculate the air mass using a TPS and and IAT sensor. | + | the only vacuum hoses needed are |
- | * Obtain a 240SX TPS, remove the EGI TPS and bolt on. | + | * one to the fuel regulator |
- | * Obtain GM IAT sensor. Drill hole in your air cleaner-to-throttle body pipe, and hot-glue the IAT in place. Or use JB-weld. Threaded bungs are available if you want to get really fancy. | + | * one from the throttle body to the distributor |
+ | * manifold to MegaSquirt | ||
- | Wire up the Megasquirt harness | + | = Sensors = |
+ | With MegaSquirt you won't need the Datsun airflow meter. Instead, Megasquirt will calculate the air mass using a MAP sensor and and IAT sensor. | ||
+ | * MAP sensor is built into Megasquirt. Connect vacuum hose to manifold | ||
+ | * Obtain GM IAT sensor from a Chevrolet or Holden. Drill hole in your air cleaner-to-throttle body pipe, and hot-glue the IAT in place. Or use JB-weld. Threaded bungs are available if you want to get really fancy. | ||
+ | |||
+ | * [http://www.megamanual.com/v22manual/mwire.htm MegaManual] | ||
+ | * GM IAT Sensor 12146312 [http://www.rockauto.com/catalog/x,carcode,1038079,parttype,4748 $10 RockAuto.com] | ||
+ | {{PhotoTh!|TS10075A.jpg}} | ||
+ | * GM sensor connector 12162193 [http://www.rockauto.com/catalog/x,carcode,1038079,parttype,2564 $5 RockAuto.com] | ||
+ | {{PhotoTh!|HP3840.jpg}} | ||
+ | |||
+ | = Fuel System = | ||
+ | Use a 280ZX fuel pump (or Walbro inline pump), connected to the stock fuel line coming from the tank. | ||
+ | |||
+ | * 280ZX Fuel Pump [http://www.rockauto.com/catalog/x,carcode,1209338,parttype,6256 $45 RockAuto.com] | ||
+ | |||
+ | Run a regular fuel line back to the the filler hose and Tee it in. If you keep the tank above 1/4 full no baffles or surge tank are needed. | ||
+ | |||
+ | From the fuel pump output to the fuel rail, use EFI-rated fuel hose and EFI hose clamps. Use a 280ZX-style fuel filter. | ||
+ | |||
+ | Nissan EFI fuel pump with damper can be mounted in rear of car or in engine compartment | ||
+ | <br>{{Album|21845}} | ||
+ | |||
+ | 280ZX EFI fuel filter [http://www.rockauto.com/catalog/x,carcode,1209338,parttype,6200 $3 RockAuto.com] | ||
+ | <br>{{PhotoTh!|BA0430165.jpg}} | ||
+ | |||
+ | = Wiring = | ||
+ | Wire up the MegaSquirt harness | ||
* 12V | * 12V | ||
* earth/ground | * earth/ground | ||
* fuel pump relay | * fuel pump relay | ||
* injectors | * injectors | ||
- | * TPS | + | * IAT signal & ground/earth |
- | ** Red to Vref | + | |
- | ** White to TPS | + | |
- | ** Black to TPS ret | + | |
- | * IAT | + | |
* Air Regulator | * Air Regulator | ||
* EFI Water Temp | * EFI Water Temp | ||
- | * Tach signal | + | * Tach signal (coil negative terminal) |
+ | |||
+ | For full details, see http://www.megamanual.com/mtabcon.htm#wire | ||
+ | |||
+ | Obtain a dropping resistor pack, and connect to injectors | ||
+ | <br>{{Album|21853}} | ||
+ | |||
+ | See main article: [[Dropping_Resistor]] | ||
+ | |||
+ | {{Photo!|DROPPING_RESISTOR.jpg}} | ||
+ | |||
+ | = ECU Configuration = | ||
+ | Download at http://www.diyautotune.com/softwarelinks.htm | ||
+ | * Mac | ||
+ | * Windows | ||
+ | * Linux | ||
+ | |||
+ | You have a choice: | ||
+ | * TunerStudio free version (most popular software for MegaSquirt) | ||
+ | *: Free version supports all MegaSquirt features | ||
+ | * SuperTunix open source | ||
+ | |||
+ | In the software configure | ||
+ | |||
+ | Fast Idle Valve (FIdle): Solenoid | ||
+ | Fast Idle Threshold: 120F | ||
+ | |||
+ | Nissan temp sensor | ||
+ | -40F 30-33000 ohms | ||
+ | 80F 2000-2500ohms | ||
+ | 160F 360 ohms | ||
+ | |||
+ | CONSTANTS | ||
+ | Required Fuel | ||
+ | * displacement 1397cc (A14) or 1488cc (A15) | ||
+ | * # of cyl 4 | ||
+ | * injector flow rate 188 | ||
+ | * desired AFR 13 | ||
+ | Injector open time 1.0ms | ||
+ | batt V correction .20 | ||
+ | PWM current limit 1000% | ||
+ | PWM time threshold 25.4 | ||
+ | Fast Idle Threshold | ||
+ | Barometric Correction: Off | ||
+ | Control Algorithm: Speed Density [non-TPS] | ||
+ | Injections per Engine Cycle: 1 squirt | ||
+ | Injector Staging: simultaneous | ||
+ | Injector Port Type: multi-port | ||
+ | Engine Type: even fire | ||
+ | |||
+ | VE TABLE | ||
+ | Generate a new table based on your peak horsepower and torque figures ('Settings/VE Table/Tools/VE Specific/Generate VETable'). | ||
+ | |||
+ | ENRICHMENTS | ||
+ | EGO Step (%): 0 | ||
+ | Warmup enrichment | ||
+ | -40F 180% | ||
+ | -20F 150% | ||
+ | 0F 140% | ||
+ | 20F 135% | ||
+ | 40F 130% | ||
+ | 60F 125% | ||
+ | 80F 118% | ||
+ | 100F 110% | ||
+ | 130F 103% | ||
+ | 160F 100% | ||
+ | Afterstart Enrichment: between 25-45%for 100 to 250 cycles, | ||
+ | |||
+ | = Software Tuning = | ||
+ | Start your engine and let idle. Go to http://www.megamanual.com/v22manual/mtune.htm | ||
+ | |||
+ | And start tuning. | ||
+ | |||
+ | A big help in turning is to fit an '''Air Fuel Ratio Gauge'''. MegaSquirt 2 can directly read the wideband output of the wideband controller, but more importantly you can see the A/F Ratio on the gauge. | ||
- | Obtain a dropping resistor pack, and splice into injector wires | + | {{SeeMainArticleP|Oxygen_Sensor|540-3824.jpg|aname=#Air_Fuel_Ratio_Gauge}} |
- | In the MS tuning software configure | + | The paid version of TunerStudio has a software auto-tuner which is supposed to be great, but it still requires some work (it's not totally automatic). |
- | * select Nissan temp sensor | + | |
- | * select Nissan TPS | + | |
- | * Constants | + | |
- | * VE table | + | |
- | Start your engine. | + | [[Category:Fuel_Injection]]{{End}} |
Current revision
Buy MegaSquirt II (or MicroSquirt 2) fully assembled about $400 USD or $500 AUD off eBay.
Contents |
Manifold and Injectors
Obtain an A14 or A15 EGI factory Datsun fuel injection manifold.
Make sure it includes:
- the factory rising rate regulator and fuel rail
- the fuel injectors included
- the factory 2-pin water temp sensor
- the throttle body. The Factory one is good for 92 hp
- the air regulator. It will run without this if you want to hold your foot on the throttle while engine is warming up to 120F/45C
Everything else may be removed from the manifold.
- if you remove the EGR passage, fit a blocking plate
- an O2 sensor is not required
- TPS is not needed
the only vacuum hoses needed are
- one to the fuel regulator
- one from the throttle body to the distributor
- manifold to MegaSquirt
Sensors
With MegaSquirt you won't need the Datsun airflow meter. Instead, Megasquirt will calculate the air mass using a MAP sensor and and IAT sensor.
- MAP sensor is built into Megasquirt. Connect vacuum hose to manifold
- Obtain GM IAT sensor from a Chevrolet or Holden. Drill hole in your air cleaner-to-throttle body pipe, and hot-glue the IAT in place. Or use JB-weld. Threaded bungs are available if you want to get really fancy.
* MegaManual * GM IAT Sensor 12146312 $10 RockAuto.com * GM sensor connector 12162193 $5 RockAuto.com
Fuel System
Use a 280ZX fuel pump (or Walbro inline pump), connected to the stock fuel line coming from the tank.
* 280ZX Fuel Pump $45 RockAuto.com
Run a regular fuel line back to the the filler hose and Tee it in. If you keep the tank above 1/4 full no baffles or surge tank are needed.
From the fuel pump output to the fuel rail, use EFI-rated fuel hose and EFI hose clamps. Use a 280ZX-style fuel filter.
Nissan EFI fuel pump with damper can be mounted in rear of car or in engine compartment
280ZX EFI fuel filter $3 RockAuto.com
Wiring
Wire up the MegaSquirt harness
- 12V
- earth/ground
- fuel pump relay
- injectors
- IAT signal & ground/earth
- Air Regulator
- EFI Water Temp
- Tach signal (coil negative terminal)
For full details, see http://www.megamanual.com/mtabcon.htm#wire
Obtain a dropping resistor pack, and connect to injectors
See main article: Dropping_Resistor
ECU Configuration
Download at http://www.diyautotune.com/softwarelinks.htm
- Mac
- Windows
- Linux
You have a choice:
- TunerStudio free version (most popular software for MegaSquirt)
- Free version supports all MegaSquirt features
- SuperTunix open source
In the software configure
Fast Idle Valve (FIdle): Solenoid Fast Idle Threshold: 120F
Nissan temp sensor -40F 30-33000 ohms 80F 2000-2500ohms 160F 360 ohms
CONSTANTS Required Fuel * displacement 1397cc (A14) or 1488cc (A15) * # of cyl 4 * injector flow rate 188 * desired AFR 13 Injector open time 1.0ms batt V correction .20 PWM current limit 1000% PWM time threshold 25.4 Fast Idle Threshold Barometric Correction: Off Control Algorithm: Speed Density [non-TPS] Injections per Engine Cycle: 1 squirt Injector Staging: simultaneous Injector Port Type: multi-port Engine Type: even fire
VE TABLE
Generate a new table based on your peak horsepower and torque figures ('Settings/VE Table/Tools/VE Specific/Generate VETable').
ENRICHMENTS EGO Step (%): 0 Warmup enrichment -40F 180% -20F 150% 0F 140% 20F 135% 40F 130% 60F 125% 80F 118% 100F 110% 130F 103% 160F 100%
Afterstart Enrichment: between 25-45%for 100 to 250 cycles,
Software Tuning
Start your engine and let idle. Go to http://www.megamanual.com/v22manual/mtune.htm
And start tuning.
A big help in turning is to fit an Air Fuel Ratio Gauge. MegaSquirt 2 can directly read the wideband output of the wideband controller, but more importantly you can see the A/F Ratio on the gauge.
See Main Article: Oxygen_Sensor#Air_Fuel_Ratio_Gauge
The paid version of TunerStudio has a software auto-tuner which is supposed to be great, but it still requires some work (it's not totally automatic).