Revision as of 07:03, 13 February 2015

Buy MegaSquirt II fully assembled ($400).

Obtain an A14 or A15 EGI factory Datsun fuel injection manifold. Make sure it has:

factory rising rate regulator and fuel rail
fuel injectors included
a throttle body. The Factory one is good for 92 hp
the air regulator. It will run without this if you want to hold the throttle open 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

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. 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.

Use a 280ZX fuel pump, plumbed into the stock fuel line.. Connect the fuel reg output to.a line teed into the filler hose. If you keep the tank above 1/4 full no baffles or surge tank are needed.

Wiring

Wire up the MegaSquirt harness

12V
earth/ground
fuel pump relay
injectors
IAT
Air Regulator
EFI Water Temp
Tach signal

Obtain a dropping resistor pack, and splice into injector wires

ECU Configuration

Download at http://www.diyautotune.com/softwarelinks.htm

Mac
Windows
Linux

You have a choice:

TunerStudio free version
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.

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EGI MegaSquirt

Revision as of 07:03, 13 February 2015

Wiring

ECU Configuration

Software Tuning