My CNG conversion

[Dirtrider_ak]

dun install scrap the car

[Saggi]

yah , i think so , scrap and get a parallel import one and still got tax rebate..

[Cyberet]

that was during promotion period i think.

since 2 yrs later u're gonna scrap, then don't install lor

[Incom]

If your car's intake manifold is not those plastic type, you can opt for those cheaper mixer kit. But 2K might be the introduction figure, the price might be more than that now.

 

You will need to calculate how many KM your car need to run with CNG to break even when compare to running on petrol. Also consider how long will you need to take to run that much of mileage.

 

If you want to use your existing car to do CNG conversion, i would suggest you ask the installer to run a test your car's ignition system. This is to make sure your car's ignition system is healthy. With the check, a CNG installer will be able to advice you of any potential problems should you still decided to proceed with the conversion. If not once converted to use CNG, you will might encountered problems which either require you to visit your CNG installer frequently or DIY troubleshooting to correct the problems.

 

Hope this information helps.

 

Cheers

[Incom]

Hi,

 

I think i might have the same problem before as what you are facing. I got my car converted to use CNG about 2 weeks back at Scantruck. My car is a 2003 Corolla G9 Auto version.

 

The moment i got the car back from the workshop, the car stall at one of traffic lights near the workshop. The symptom is once the traffic light turn green, i let go my foot brake before i can stepped on the accelerator, the car stalled. Later i realised at traffic lights if i need move off from stationary i will need to quick step on the accelerator once i let go the foot brake. Not only at traffic lights, i also need to do the same trick if the car needs to move off from stationary at slope. This problem exist regardless whether the weather is hot or cold. Due to the fact i am not the only who drives the car, i decided to send the car back to the CNG workshop after 2 days of usage. I am lucky to bump into a guy which Scantruck hired from Malaysia to come and looking into their CNG conversion operation.

 

Scantruck managed to locate 2 problems with my CNG installation and retified them. Now i do not have the problem as per described above.

 

The 2 problems are:

- The rubber pipes from the injector rail to the intake manifold are of different lengths.

- Location of the rubber vacuum rubber pipe from intake manifold to the vaporiser.

 

As of now i do not know is there any different between the installation CNG kits for auto and manual, and different brands of CNG kits. So hope my information helps.

 

Disclaimer: I am not related to Scantruck. I am just describing the things which i have encountered so far with my CNG conversion.

 

Cheers.

Edited April 14, 2008 by Incom

[Genie47]

I'm getting lots of afterfires when I down gears.

 

Now this car has become SG CNG WRC. I speed up, down the gear and BAP BAP BAP BAK PAK VROOOMMM.....

 

Stalling less of a problem but will monitor.

[Incom]

Hi,

 

Alot of cars will siam your car

 

From what i understand, the pipes length from rail to intake must be all of same length to ensure that all the cylinders received the same amount of CNG. If the pipes require to be bent, make sure the air flow thru the pipes are not obstructed. As for the location of the point for the vacuum tube from intake manifold to vaporiser, is to ensure accurate detection of amount of air going thru the intake manifold. I use to also have the problem that if i speed all the way at highway, then turned into small roads. The moment i break at next traffic light, the car will shiver and stalled. This is due to the vaporiser is not detecting the correct amount of air, and feed too much of CNG into the engine and caused it too stalled.

 

Hope this helps.

 

Cheers.

[Boyboy]

take video n post on utube leh

 

macam anti-lag system with ignition cut..

[Genie47]

Inside car how to take video?

 

Anyway not as loud as anti-lag afterfire.

 

Can here it is along the exhaust.

 

Will tell Melchers later. Anyway, the solenoid valves might be degrading too. Must be replaced.

[Boyboy]

actually ah, for all the re-tuning u went thru, as well as the initial cost, do u still think CNG was worth the effort?

 

i'm interested in outfitting my next ride with it. definitely not for my current ride, as i was never one to be an early adopter, and reading about ur woes, as well as dirtrider's, makes me apprehensive to join the fart-powered community.

[Dirtrider_ak]

I think my car have this syndrome.. I'll give it a check

[Dirtrider_ak]

well all i know you can enjoy petrol .... I am enjoying the car it did not broke down anyway .... LOL laughing my way to the bank.

[Incom]

Ok, hope my information helps.

 

Cheers

[Furrynadz]

so many problems

wat this abt solenoid valves?

[Boyboy]

for u, convert early, convert cheaply, maybe worth it. maybe...

 

new car, also worth, cos with rebate etc, still cost less overall..

 

but the main concern here is the problems. or maybe genie's case is isolated?

 

no denying that you save as compared to SG petrol in the long run. but seems like going up to JB every 300km (my range to 3/4 mark) is less of a hassle than installing CNG and retuning it every now and then.

 

i did a calculation. JB petrol VS singapore CNG. i will never attain ROI

 

JB petrol vs JB CNG, ROI is maybe 7 yrs. not to mention loss of boot space

 

but i am glad it works out for you and wish u happy motoring. i still KIV-ing CNG if i buy my next car new. if 2nd hand, a whole other story, will think about it then.

[Genie47]

The problem with D_ak and me is that our cars are manual.

 

The auto cars never give this kind of problems. Their ECU does everything. We on the other hand have to keep the car from stalling.

 

Solenoid valves are mechanical. They open and shut so that the gas can go in at timed intervals and duration. They will wear down. Tuning so far free.

[Genie47]

It's isolated to only D_ak and my car. Manuals. The CNG taxis never have this problem. Automatic transmission.

 

CNG will not ROI JB petrol. However, you have not factored in the political factor that is in MY. That is the biggest risk above all. They have clobbered us over CLOB 10yrs ago, they have did this and that. Some are rumors though some are not.

 

I'm still getting petrol and CNG from JB. However the most important thing I have is that reliance on JB petrol has been reduced. My "expense risk" has been reduced far lower than anyone's through "expense diversification". I have far above any driver in SG using petrol exclusively, I have the power of choice. MSK escaped and made leaving SG customs hell. I stayed in and filled up on gas. Now things have cleared up somewhat I return to JB for gas, car washings and petrol not to mention the cheaper breakfast. Policy changes, I got choices. Price changes, I got choices.

 

With petrol alone be it JB or locally. There is only 1 choice as George Lam says. Count JB petrol, you got 2. I have 5.

 

I am. FREE.

[Dirtrider_ak]

No worries it is just choices that we make.