Install NGV On A NAZA RIA

Dear All,

We had the opportunity to view and install NGV on a NAZA RIA based on factory-fitted Standard Installation Procedure, courtesy of NAZA Manufacturing, CNA Manufacturing and PDI-assembler Tactical Force. It is a cooperation of three companies, fitting NGV system on NAZA RIA in Gurun, Kedah.


System: EngineTech, Korea
ECU: DNGV, Korea
Injector: HanaTech, Korea.
Reducer: OMVL REG CNG reducer, Italy


Firstly, the workmanship is par above excellent. It has the look, design and feel of an OEM-fit NGV system. The wiring harness are made to 'Plug & Play' approach, with pre-built socket attachment. Only 3 wires are attached to the original RIA ECU, based on 3C method (cut, connect & cliplock). The 3 signal wires are connected inside the vehicle at the original ECU level. The main cable loom is insulated with PVC tubing.


Secondly, there are 3 OEM-design brackets using 'Plug & Play' approach, where the brackets attached to existing screws. There is no need for drilling onto the vehicle body. The first bracket is for the OMVL Reducer, another for Gas Refilling in the engine compartment and 3rd bracket for the Injector Rail.


Thirdly, the GAS ECU is placed inside the car. It is located under the steering column (driver side). It is firmly attached into place with another bracket.


Fourth, the Switchover unit is installed on the DASHBOARD and fit nicely next to the hazard light button.


Fifth, the cylinder is a 70L (ENK, Korea) and covered with a factory-design carpet cover.


Finally, the EngineTech software is the most impressive part. We were given the opportunity to tune a NAZA RIA-EngineTech NGV, by Tactical Force request. Here is what we have noticed:


Base Setting - setting the vehicle for meter reading(LED indicator), Petrol2Gas changeover parameters, Injector Change Tester, and RPM signal reading. The best part is an Engine LOAD Correction adjustment.


O2 Setting - setting to establish the correct reading for rich/lean mixture according to the correct voltage produced by the Oxygen (Lambda) sensor. There is also another O2 Feedback Correctio adjustment.

Acceleration Setting - setting to establish the right acceleration response. This is the most useful tool as we used it to correct the time delay on gas injector (due to the long length of the injector piping to the intake manifold). This brought about an immediate acceleration response on NGV. The RIA just take-off upon pedal acceleration without delay. And we had 4 adult-males in the car too.

MAP setting - setting to establish the correct air-fuel mixture at each RPM speed. This was pretty standard in all software.

Auto-Calibration - to auto-tune the gas system to the car. We did not use this function as the GAS ECU is factory-programmed. However so, our RIA had some problems at 2,000-3,000 rpm range and injecting too much gas into the engine. Thus, we did manual tuning instead.

Hardware Setting - setting to establish the correction response to voltage signal on reducer temperature, gas pressure and gas temperature.

Real Time Data Display - an overall of the system in a single page display of real time data.



In conclusion, This is the CORRECT NGV system for NAZA Ria. The Naza RIA owner (Mr Richard - 1st batch No.35 NAZA RIA NGV delivered) was complaining that it was underpowered and high gas consumption. It was diagnosed that 2,000 - 3,000rpm range, the car was running too rich in gas. Thus, we recalibrated it lower and readjusted the Acceleration response. After tuning for 20 minutes, the owners was getting worried with his car. He was trying to control his new NAZA RIA as it was very powerful.

Before, he was pressing down the pedal to the maximum.
After, he was lightly pressing down only.