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You can fit the 1980-1983 Nissan 200SX EGI System to your Datsun 1200 . Tens & Twenties has written an interesting article on fitting this Nissan EFI system into other cars. This is from the 1980 200SX (aka S110/Sylvia/Gazelle) with Z20E engine.
this set-up will run just about any 4 cylinder in the world ... And it's easier than you think. ;^)
A link to his original article is below (see More Information section). Following is additional information on 1981 Datsun 200SX EGI system. Get all the parts if you wish to do this conversion: From the fuel pump to the relays and all the wiring harnesses, etc.
Contents |
Overview
The 200SX parts can be used with some bracket-mounting modifications for the A-series factory EFI manifold. The Z-series manifold is very similar, except of course for the runners and facing bolt pattern.
A-series EGI manifold
See the EGI main article for information about this manifold.
It would be best to use the wiring and sensors from an A14E or A15E engine (Asian-market B310), but since those are virtually non-existent in USA, you can use the 200SX parts.
1981 200SX Underhood parts location
Don't forget the check valve
Fuel Check Valve
Specifications
Fuel pressure (after fuel filter)
30 psi at idle
37 psi at Initial full throttle
Fuel pump
43-64 psi Cut-off discharge pressure
5.1 amps Design current
Pressure regulator
36.3 psi
Air regulator
671 cu ft/hr Air flow (@68 F/20 C)
25-90 ohms heater coil resistance
Fuel injector
2.35 ohms coil resistance
Vacuum switch
6.30 in Hg - intake vacuum when switch turns on
System Parts
Anti-Clockwise from top:
- Injector
- Pressure Regulator
- Fuel Filter Rockauto.com
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- Nissan EFI 1975-1997
- BECK/ARNLEY 0430165
- ACDELCO GF495
- WIX 33022
- FRAM G7404
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- Air regulator
- Throttle chamber
- Dash pot
- Throttle valve switch
- I.A.S. unit
- Air flow meter
- Air temperature sensor
- Dropping resistor
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- Cylinder head temperature sensor
- Exhaust gas sensor (U.S.A. models)
- Control unit
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- Fuel damper & Fuel pump
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Other Parts
Air Filter Rockauto.com
- FRAM CA4303
- ACDELCO A749C
- BECK/ARNLEY 0420810
- WIX 42136
- Height 1.416
- Width 6.198
- Length 10.710
- CFM 210
Fuel Check Valve
- 17330-U7400 VALVE ASSY-FUEL CHECK
- 720 0780-1280 K/CAB.2WD, T.REG.2WD, T.LONG.2WD+HD/T
- 720 0679-0680 T.REG, T.LONG+HD/T, K/CAB
- 910 0780- W.L24E + W.LD28, LD28.MT.F5 + S.LD28.AT + S.L24E
- S110 0179- (FED.HT+CAL.HT)Z20E+FED.HT.Z
EFI vacuum switch
Ignition Coil & Distributor
1979-up systems use a 12 volt primary coil (no ballast resistor is used).
Coil Specifications| model | Type | Primary resistance | Secondary resistance |
| 1980 California | CIT-38 | 1.04 to 1.27 ohms | 7.3 to 11.0 ohms |
| 1980 49-state and Canada | CIT-30 | 0.84 to 1.02 ohms | 8.2 to 12.4 ohms |
| 1981 US (all) | CIT-46 | 1.04 to 1.27 ohms | 7.3 to 11.0 ohms |
The 200SX uses the typical block-box distributor, with the same control box as the USA B310 distributor. But you don't need this, it won't affect the EFI system.
B310 Electronic distributor article
High-Pressure Fuel filter replacement
The fuel filter is attached by a bracket to the right shock well. Be sure to replace with a specific high-pressure equivalent
Before disconnecting the fuel lines from the filter, the pressure in the fuel system must be reduced to prevent dangerous spraying. This is done in the following manner:
- Locate the fuel pump relay-2 attached to the engine compartment relay bracket. The bracket must be removed from the body in order to gain access to the relays
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Fuel pump Relay-2
-
- Start the engine and allow it to idle
- With the engine running, disconnect the wiring connector for fuel pump relay-2. NOTE: Wires to this relay are light green, blue, blue/white stripe and black/white stripe.
- Wait for the engine to stall, then crank the engine over 2 or 3 times
- Turn the ignition switch off and reconnect the wiring connector to the fuel pump relay-2. Reconnect the relay bracket.
After the fuel pressure is bled off:
- Disconnect both fuel lines from the fuel filter and lift the filter out of its bracket
- When connecting the fuel lines to the new filter, use hose clamps and position them 3mm from the ends of hose.
General Description
The Datsun NAPS-Z engine uses and Electronic Fuel Injection (EFI) fuel system in place of the conventional carburetor-type system. Electronic fuel injection provides continous optimum mixture ratios at all stages of combustion.
The EFI system consists of three sub-systems:
- fuel flow system
- air flow system
- electrical signaling system
Fuel Flow System
Fuel from the tank is delivered at about 36 psi. To minimize pulsing it goes through a mechanical damper. The regulator maintains a constant pressure difference between the fuel line pressure and the intake manifold vacuum. Excess volume and pressure is returned to the tank via the return line.
Injection occurs once every engine rotation. All four injectors operate simultaneously and independent of the engine stroke. Each injector supplies half the amount of fuel required by the cylinder. The length of the injection period is determined by the control unit after consulting all the various input sensors, such as RPM, throttle position, air temperature, manifold vacuum, etc.
Three relays are used for the fuel pump. This system is designed to prevent pumping if the engine stops running. Apparently there is a relay for Ignition, fuel pressure and oil pressure. Loss of any of these signals will stop the pump.
Electrical Signaling System The 1980 system does not use an oxygen sensor, but the 1981 model does.
1981 200SX Wiring
wiring diagram
More Information
- Kelvin Dietz: 200SX EFI article on Dime Quarterly
- Fuel Injection main article
- Chilton manual for 200SX (buy it at Amazon.com) includes wiring diagrams, and troubleshooting information.
- Nissan factory service manual for Datsun Model Series S110 (200SX)