Alpha Engine G4EK/G4FK (Excel)

Alpha Engine G4EK/G4FK (Excel)

Information on the Hyundai Alpha engine








General Information

Cylinders
4
Displacement

G4EH A1.3D 1341cc

G4EE 1.4 1399cc
G4EK 1.5L 1495cc
G4FK A1.5D 1495cc
G4ED A1.6D 1599cc
Firing Order
1,3,4,2

This engine is common in Hyundai Excel class racing.




Model Variants

G4EK

12V, SOHC, MAF, EV1 Injectors, 10.0:1 compression

G4EK Turbo
7.5:1 compression, Garrett T15 Turbo

G4FK

16V, DOHC, TMAP + MAF. EV6 Injectors, 10.0:1 compression

G4ED

16V, DOHC, 10.0:1 compression



Hyundai Excel X3

1994-1996 Excel with G4EK engine 1.5L
1997-on Excel with G4FK engine 1.5L

Hyundai S Coupe

G4EK

Hyundai S Coupe Turbo

1992-1994 G4EK Turbo







Sensor Information

Crank/Cam Sensor

This engines uses a Crank Position Sensor and a Cam Position Sensor.  The crank trigger is located as part of the crankshaft towards the flywheel end and it has a 60x tooth wheel with 2x missing teeth (60-2).   The cam trigger has a single tooth.








Crank Sensor

A Reluctor crank position sensor is used. 



Reluctor Wiring
Pin
Description
Haltech Connection (Trigger 4-core)
1 (D)
Reluctor +
Yellow
2 (E)
Reluctor -
Green
3 (F)
Shield
---



Cam Sensor

A Hall Effect cam sensor is used.  This is located on the flywheel end of the cylinder head.


Hall Effect Wiring
Pin
Description
Haltech Connection (Home 4-core)
1 (A)
12V+ Switched
Red
2 (B)
Home +
Yellow
3 (C)
Signal Ground
Blue










Ignition Coils and Igniter

The ignition coils on this engine are of a waste spark design and require an external 2-channel igniter module. The OEM ECU contain the igniter.

Haltech many years ago used to sell this exact coil pack and bracket.


Pin
Description
1
Coil 1+4 Negative
2
Coil 2+3 Negative
3
12V+ Switched


Haltech Dual Channel Igniter (HT-020002)

The Haltech 2-channel OEM Igniter is a good choice for this application.




Dwell Time










Throttle Position Sensor

This engine uses a cable operated throttle body with a position sensor.







MAP Sensor

Although most of these engines come with a MAF, there are variants that have a MAP sensor instead.  This is directly bolted to the intake plenum.





It is instead recommended to use the internal MAP sensor that comes with your ECU.  For higher boost levels an external MAP sensor should be used, connected to a spare AVI.








Idle Valve

This engine uses a 3-pin (Bypass Air Control) Valve which is duty controlled by the ECU via 2x outputs.


3-pin BAC Wiring
Pin
Function
Haltech Connection
1
Open Signal
Spare Output
2
Power
12V+ Switched
3
Close Signal
Spare Output









Coolant Temperature



Wiring is not polarity sensitive
Pin
Haltech Connection
1
Any Spare AVI*
2
Signal Ground
An AVI with a selectable Pullup should be used.  If not and external 1k pullup to 5V should be connected.








Air Temp

All engines have an Air temperature Sensor.  Variants that have a MAP Sensor have a second Air Temperature Sensor included as part of the MAP sensor (See MAP Sensor section for wiring of this sensor).

Wiring is not polarity sensitive.
Pin
Haltech Connection
1
Any Spare AVI*
2
Signal Ground
An AVI with a selectable Pullup should be used.  If not and external 1k pullup to 5V should be connected.







Knock Sensor

These engines have 1x knock sensor.


Pin
Haltech Connection
1
Knock Signal
2
Signal Ground







MAF Sensor

Although most users of Haltech ECUs will be deleting the MAF, it is possible to use a MAF if you prefer.  Early models with the G4EK came with a MAF Sensor.  Newer G4FK models have a MAP sensor and no MAF is present.

Pin
Description
Haltech Connection
1
Signal
Spare AVI
2
12V+ Switched
---
3
Sensor Ground
Signal Ground (Black/White)
4
Power Ground
---







O2 Sensors

These vehicles come with a 4-wire narrow band O2 sensor.

O2 Sensor Wire Colours
Haltech Connection
Black (Signal)
AVI 1 or AVI 6
Grey
Signal Ground (Black/White)
White
12V+ Switched
White
Chassis Ground (not Signal Ground) or Spare Output
It is possible for the ECU to supply a duty signal to the Heater Ground, with many OEM ECUs doing this.  Haltech ECUs can also perform this task and a spare Injector or Stepper Output should be used.
O2 Sensors can use various wattage heater elements, with 12W and 18W being common.  For 18W units it is advised to not supply more than ~50% duty to prevent excessive current being applied to the ECU output.

For post-cat sensors it is advised to not enable the heater ground control until the engine is at full operating temperature. This is to prevent moisture in the exhaust from a cold started engine from damaging the heater element.  Many OEM strategies involve not enabling the heater until the engine have been driven above a set speed for a set amount of time.



For correct operation a Haltech WB1 kit is highly recommended for this application, with the provided 4.9 sensors replacing the pre-cat sensors.  Sensors use a 22mm socket or spanner to remove and replace.










Injector Data

Flow

The injector flow rate is measured with the injectors held wide open at 100% duty.  For fuel systems with a fixed regulator pressure (often returnless systems) that is not referenced to manifold pressure the flow needs to be mapped over Manifold Pressure for accurate tuning.

G4EK ~ 172cc/min

Injector Part Number
Flow Rate /min
Engine
0-280-150-742
192cc
1.5L and 1.6L
0-280-150-773
150cc
1.5L
0-280-150-745
235cc
1.6L
0-280-150-776
192cc
1.5L



Dead Time

When an injector is commanded to open for a certain amount of time, the dead time is the amount of time the injector is not actually open during this period.  It covers the time to energise the solenoid and begin to open and the time to close as well.  There are also transient periods during which the injector is opening and closing where fuel flow is not at full capacity so this lost peak flow period is also taken into account.  

Unavailble









OEM ECU Information

G4EH ECU

   

G4FK ECU




ECU Pinout

1994-1996 Excel X3 G4EK






   




1998- Excel X3 G4FK










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