Auto-LPG Conversion Thread

[paolorenzo]

Ako naman baliktad. I use LPG 99% of the time now. I use gas for startups only (auto-switch function of EROOM), and for short distances every 2 weeks (1-way trip to office, 8kms). Yesterday was one of the days I used gas. Ang hirap mag-accelerate! Kailangan i-diin yung pedal para mag-respond, and sobrang gradual ang pag-accelerate. Barado na yata injectors at fuel filter ko. Probably stale gasoline as well.

Sarap kasi mag LPG eh. Hiyang na engine ko to LPG, so very responsive na siya to LPG. Mura pa gas bill ko! Woohoo!

[niky]

Ako naman baliktad. I use LPG 99% of the time now. I use gas for startups only (auto-switch function of EROOM), and for short distances every 2 weeks (1-way trip to office, 8kms). Yesterday was one of the days I used gas. Ang hirap mag-accelerate! Kailangan i-diin yung pedal para mag-respond, and sobrang gradual ang pag-accelerate. Barado na yata injectors at fuel filter ko. Probably stale gasoline as well.

Sarap kasi mag LPG eh. Hiyang na engine ko to LPG, so very responsive na siya to LPG. Mura pa gas bill ko! Woohoo!

Probably your gas injectors were a little gummy... you should use it on gas from time to time.

Greenfuel's system doesn't have this issue... the gasoline injectors pulse once every few minutes to stay clear.

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*qant2boy and aamd: The problem with hesitation is most likely your car's built in closed-loop control systems. These use the readouts of the O2 sensor to make adjustments to the air-fuel mixture at low rpms in order to ensure a 14.7:1 air-fuel ratio is maintained. This helps to keep your catalytic converters happy.

The problem is, stoichiometric ratio for LPG is slightly different from gas... so your LPG kit has to be tuned so that within closed-loop (below 3000 or 4000 rpm), the LPG injectors emulate the gasoline injectors closely enough that the engine won't notice the difference, throw a CEL and run differently.

On many cars, this isn't a problem. Just occassionally, the installers don't get the LPG emulation close enough to keep the ECU happy.

This is simple enough to correct with a wideband O2 sensor and some programming time... which Speedlab can provide. Otherwise, you can "clamp" the O2 sensor with a resistor so it won't be able to detect the difference. Still trying to find a source for the clamps (for another project... ), but you can ask Speedlab or other tuning shops about it.

[quan2boy]

Quan2Boy,

Is your Camry using SGI?

Is the aircon on? Have you checked your air filters?

Straker, yes my Camry has SGI installed. Aircon was on. I had new air filter and spark plugs installed per advice by Greenfuel (Ian).

[[JaNuS]]

was at green autogas earlier. was scheduled to have my car fitted but there was a problem. they said that i need to install my stock filter. my current one is with a carb adapter, tube then a cone filter. compression and other things checked out ok. so naghanap ako sa banawe ng surplus filter. mas mura pa ang saucer type na simota. kelangan po ba talaga yung stock na filter? what's the difference?

btw, cute si sharon. lalu na i have a thing w/ tsinitas w/ braces. haha.

[quan2boy]

dude, san ka nagpa convert? kasi ganyan dati ang prob ko sa adventure ko using EROOM's closed loop kit...almost all na mitsu na kino convert nila ayon kay bigfootoz e may CEL (check engine light) prob...pero naayos na ng EROOM yun ngayon, nag add pa ng isang emulator yata yun o ECU, ayun wala na, mas gumanda pa takbo...i think sakit ng mitsu talaga yan na kapag walang nasesense yung engine na walang lumalabas sa nozzle ng gasoline e umiilaw yung CEL...maganda i-coordinate ng installer mo yan sa MMC (mitsu motors) para ma-address...

__________________
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Hmmmm. This may be worth checking. Baka nga pag walang gasoline na nase-sense eh umiilaw yung CEL. That being said, paano nga pala yung fuel pump? Di kaya masisira yun kung walang fuel na hinihigop??

[quan2boy]

Your options:
1. Bring to Speedlab for instrumented tuning.
2. Go back to Greenfuel for small adjustments.

Thanks ghosthunter. I'll probably go to Speedlab on Monday for more precise tuning. Will let you guys know if they are able to fix my CEL and acceleration problem.

Cheers!

[quan2boy]

Greenfuel's system doesn't have this issue... the gasoline injectors pulse once every few minutes to stay clear.

Yes. I noticed this in Greenfuel's SGI. Every 15 minutes or so, the system switches to gasoline for 5 seconds or so. Minsan kasi pag nata-timing na nagloloko LPG ko (i.e. ayaw mag-accelerate no matter how I floor the gas pedal) tapos nag-switch sa gasoline, biglang harurot naman ako...5 seconds nga lang kasi pag balik sa LPG, kapos ulit power.

This is simple enough to correct with a wideband O2 sensor and some programming time... which Speedlab can provide. Otherwise, you can "clamp" the O2 sensor with a resistor so it won't be able to detect the difference. Still trying to find a source for the clamps (for another project... ), but you can ask Speedlab or other tuning shops about it.

Oo nga. I think I really need to pay Speedlab a visit...

[Mile2]

btw, cute si sharon. lalu na i have a thing w/ tsinitas w/ braces. haha.

hehehe

[ghosthunter]

btw, cute si sharon. lalu na i have a thing w/ tsinitas w/ braces. haha.

OT: She still single?

[glennjv]

So my Dad picked up his Camry 96 2.2L (no O2 sensor) at GreenFuel last thursday. Using the SGI with no O2 sensor since na recommend to observe muna daw the car.

The next day while driving along SLEX going to makati my parents the engined stalled. He was running on LPG. So he pulled over to the side and tried to restart the engine. It wouldn't respond. Then just about when he was going to go out, he tried it and it started.

He went back to GreenFuel supposedly to have the O2 sensor installed and hopefully the car performs better. It was just adjusted again with no O2 sensor installed.

On their way back home to alabang along SLEX again the car stalled again. =(
He was able to start it up again after a few minutes.

I was then able to test out the car. Starting it up on gas and then transistioning to LPG was fine. I couldn't even feel it. The acceleration to about 60kph was fine but I can feel I can't push it to accelerate like gasoline.

I then tried to run on gasoline. The weird thing is from idle the engine will start kinda like choke and feel the engine really having a very hard time. VERY ABNORMAL.

My dad then decided to fill up the gas with High Octane gasoline to lessen the Octane gap between the Gas and LPG. (Hunch niya) He's also planning to change spark plugs. His filter is pretty new so he said that can be it.

Here's my question. If the SGI is supposedly an ADD ON to the system then why did the car lose acceleration POWER running on Gasoline?
The A/F mixture for the gasoline wasn't tinkered with right? Only the A/F mixture for the LPG are being adjusted by technicians?

So my dad is hoping this gets fixed and he's actually willing to pay for the additional O2 sensor if it'll get this problem fixed.

I have some hesitation though that even if the O2 sensor is installed, the car will still have problems.