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Revision as of 00:53, 8 January 2015

You can fit the 1980-1983 Nissan 200SX EGI System to your Datsun 1200. Get all the parts if you wish to do this conversion: From the fuel pump to the relays and all the wiring harnesses, etc.

S110

1 Overview
2 Existing Articles
3 Specifications
- 3.1 System Parts
4 Other Parts

Overview

You need all the parts listed below. There are a LOT of parts (as with any EFI system). This includes the pressure fuel pump & filter. Obtain as many of the parts as you can from a donor S110.

You can use either the S110 parts or the B310 parts, or a mixture. Additionally, many of the parts are available on the 280ZX such as injectors, sensors and fuel pump. See the EGI article for more details on specific parts.

The 200SX parts can be used with some bracket-mounting modifications for the A-series factory EFI manifold. The Z-series (Z20/Z22 engine) manifold is very similar, except of course for the specific bolt pattern.

A-series EGI manifold

See the EGI main article for information about this manifold.

Compare to L-series EFI manifold. Same design, but runner flanges suit L16/L18 engine

EGI System diagram

It would be best to use the wiring and sensors from an A14E or A15E engine (Asian-market B310). If you buy a B310 inlet manifold, it will typically come with most of the needed parts. There are additional parts (e.g. airflow meter, cylinder head temp sensor, and fuel pump) needed but since those are virtually non-existent in USA, you can use the 200SX parts.

EGI System Schematic

1981 200SX Underhood parts location

Don't forget the check valve

Fuel Check Valve

Existing Articles

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).

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

Many of these parts are included with a used A-series EFI manifold. See EGI for details and/or part numbers.

Anti-Clockwise from top:

Injector - usually included with used Manifold

Pressure Regulator - generally included with used Manifold

Fuel Filter Rockauto.com - same as 280Z & 280ZX. Any EFI (high pressure) filter may be used
- Nissan EFI 1975-1997
- BECK/ARNLEY 0430165
- ACDELCO GF495
- WIX 33022
- FRAM G7404

Air regulator - generally included with used Manifold

Throttle chamber - generally included with used Manifold
- Dash pot
- Throttle valve switch

I.A.S. unit - generally included with used Manifold

Air flow meter
- with Air temperature sensor

Dropping resistor

Cylinder head temperature sensor
see ECU Temperature Sensor

Exhaust gas sensor (U.S.A. models) a.k.a. O2 Sensor only used by 1982-1983 ECU

Control unit (ECU)

Fuel damper & Fuel pump. Similar or same as 280ZX part.

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

Air Cleaner & Airflow sensor

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

*Resistence measured at @ 68 F (20 C)

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
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.

Fuel Pump Relays

Electrical Signaling System The 1980 system does not use an oxygen sensor, but the 1981 model does.

1981 200SX Wiring

wiring diagram

More Information

Tens & Twenties article
Kelvin Dietz: 200SX EFI article on Dime Quarterly
main article: EGI for A14E/A15E details
main article: Fuel Injection for general information
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)

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200SX EFI