Auto-LPG Conversion Thread

[ghosthunter]

Whew. Kakatapos ko lang basahin buong thread na 'to (49 pages, 980 posts). Ako naman 981. Very informative post.

Anyway, medyo nalito ako sa dami ng types of kits (not brands). How many types are there? Meron carb/EFI/SGI? What about open-loop vs. closed-loop? Is this the same as carb vs. EFI?

My ride is a Revo VX200 2.0L Gas (1-RZE). Uhaw na uhaw sa gaso.

Just simplifying, there is carb and efi/sgi kits. (I didn't anymore include the carb with EFI cut-off system since it's still a carb kit adopted to run on an EFI engine.) The SGi kit is basically an EFI using LPG. So far all local kits I have heard of are open loop. A closed loop would require installation of an O2 sensor somewhere in your exhaust system and some electronic control system to regulate fuel flow.

IMHO, the added potential cost and complexity of a closed loops SGI system is not worth it. Simply install the SGI kit, have it calibrated properly and go. A simple periodic check if the SGI kit is operating properly would suffice.

Why am I saying this? ... Simple, everyone wants the most high tech system/kit but very very few would like to pay for it. The carb type LPG kit is roughly P25K to P28K while the SGI kit is P52K to P65K and with these prices we already hear people complaining about it being too expensive and "I cant afford it" reasons.

Technically a closed loop SGI kit is possible. The question is if it is economically feasible to install such into your car and still have a reasonable ROI schedule in your vehicle's operational lifetime.

What about open-loop vs. closed-loop? Is this the same as carb vs. EFI?

The only biggest advantage of having a closed loop SGI kit is it can adjust for changes in air pressure better. So if you were driving up Baguio, the closed loop SGI would compensate by giving less LPG flow to keep the air fuel ratio near ideal. Otherwise your engine would run on the rich side.

Another scenario where the closed loop would be a boon is it would compensate for the condition of your air filter. A dirty air filter would let less air through. If the SGI kit didn't compensate, the engine will run rich again.