EGI MegaSquirt

(Difference between revisions)

Revision as of 17:23, 12 February 2015

Buy MegaSquirt II fully assembled ($400).

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.

Everything else may be removed from the manifold.

• 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, and manifold to MegaSquirt
• 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 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.

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

In the MS tuning software configure

Nissan temp sensor
-40F 30-33000 ohms
 80F 2000-2500ohms
160F 360 ohms

CONSTANTS
inj open time 1.0ms
batt V correction .20
PWM current limit 60%
PWM time threshold 12
 1 squirt
Required Fuel
* displacement 1397cc (A14) or 1488cc (A15)
* # of cyl 4
* injector flow rate 188
* desired AFR 13

VE TABLE
???

Warmup enrichment
-40F 180%
-20F 150%
 0F 140%
 20F 135%
 40F 130%
 60F 125%
 80F 118%
100F 110%
130F 103%
160F 100%

Start your engine.