halim

https://extranet.immigration.go.th/fn90online/online/tm47/TM47Action.do

fyi, there is a "window" of 15 days to do online reporting. if you missed it, then you have to do it in person.

just want to report in guys. had my altis fixed with lpg injection system last week. got it done at a shop on ramkamhaeng road (near NASA VEGAS hotel) and so far the result is satisfying. going back for tuning end of this week and will give an update later on.

hi guys, i just found out there are actually 3 different types of LPG systems here in Thailand. Its called Fix Mixer (Open Loop), Fix Mixer + Lambda Control (Open Loop) and The Sequential Injection System. I understand about the Injection system, but can anyone explain to me the actual difference between the Fix Mixer and Fix Mixer + Lambda control? I tried to find an answer on google, but it all came back in Thai language. And the English answer doesn't make any sense. Thanks in advance.

OK, I'll give it a try...

Fix mixer design is a device with a venturi-like hole where through the air on its way to the cylinders passes. inheritant to the design, at a certain point in the "air" tunnel, the passing airflow will create a vacuum/under pressure. in this area of the fix mixer, you will see one or more little holes in the inner wall, there the gas will be mixed into the airflow... the under pressure will suction the gas from the regulator.

Plain fix mixer: a device that is mounted on your existing carburetor and depending on the under pressure will release gas into the cylinder-air-intake, under pressure is created when you apply force to the accelerator, thus by opening the carburetor vane increase airflow into the cylinders. These mixers are installed on older cars that have no Lambda censor.

Fix Mixer with Lambda control: same principle but because the modern cars have a lambda censor feedback that will regulate the fuel-air mixture, the fix mixer needs to be able to apply the same regulating signal to the gas flow.

These apply to non-injection type engines, thus standard carburetors.

However apparently fix mixers are also offered to be installed on injector type engines, it will work, since it is also adding the gas to the airflow, but not very economical, and if the engine is in a mediocre condition, driving will not be exiting.

Modern injection engines performance and behavior is fully controlled by ECU's, if one or more cylinders are not performing equally, ECU's will try to compensate by adjusting fuel mix and ignition timing, just to make the engine run smooth. With a fixed mixer, the ECU has no ability to control the fuel mixture on each cylinder separately.

thanks sysmaster. so now i got to choose which system to use on my altis, fix mixer with lambda control (cheaper but not really economical) or injection (more expensive but i got the most out of the lpg)

hi guys, i just found out there are actually 3 different types of LPG systems here in Thailand. Its called Fix Mixer (Open Loop), Fix Mixer + Lambda Control (Open Loop) and The Sequential Injection System. I understand about the Injection system, but can anyone explain to me the actual difference between the Fix Mixer and Fix Mixer + Lambda control? I tried to find an answer on google, but it all came back in Thai language. And the English answer doesn't make any sense. Thanks in advance.