24 replies to this topic

[XXB4XX]

hey boys & girls

As per the title,

Will an LPG conversion run on the good ol' EJ20T?

At $1.70 per litre, it's looking like a very viable option..

What are your thoughts?

(p.s) don't care about power loss, I know it's innevitable, but will the thing ping itself to death even with an ECU tune?, will it be adversely affected because it's a turbot engine?

I remember reading something about an engine not creating enough exhaust gas to power up the snail.

These are the types of questions that need to be asked.. also, anyone know of it being successfully done?

[Adam]

There's not much positive info around, I've thought about it, I asked ben and he said subaru engines don't like it, so I left it there, if you find anything positive about it, let me know jtg liquid injection systems look good, I never spoke to them though.

Keen to know what you uncover

[BigWillieStyles]

The guys on the UKlegacy forums seem to do this a bit with there cars especially since petrol is much more expensive over there, might be worth a look on that forum. Subaru offer LPG cars from the factory over in Europe.

Its higher RON so should, in theory, be less pinging, right?

Heres a few -
Gen 4 3.0 to LPG

TT LPG

LPG considerations

Where did you read that about not having enough exhaust gas to power the turbo? Have a look at this wrx LPG conversion --->
Wrx.com.au

[XXB4XX]

You are a beast, to the reading glasses I go!

[RX25SE]

In theory a turbo engine on LPG should work well.


In reality LPG is teh mofo aidz.

I used to have countless dramas with LPG cars and quite often, the additional repairs caused by the LPG system soaked up the savings made by the fuel.
Some cars just dont cope well, some cope fine.

If you do go ahead with it, a vapour injection kit would be the minimum.


As a mechanic, I will NEVER own a LPG converted car. (Other mechanics may well disagree)


How long will it take to return the cost of the conversion? How long will you keep the car after that to reap the savings?
Add 10% to your service cost when doing your sums.

[tmh983]

have a look at the newer liquid injection LPG systems. They are very much a good thing, especially for turbo cars! I am planning to get this done to my tt very shortly. If you combine a liquid LPG system with a proper ecu remap, you can expect more power that petrol, due to the higher octane and cooling properties of the liquid gas.

I wouldn't bother with a vapour injection or older gas carby setup.

[RX25SE]

^^Liquid injection may be the go.

Im a bit old school.

[Trent]

I have done a bit of reading and have heard/read that whilst in theory LPG does have a higher octane rating, it varies alot from servo to servo so if you get your car tuned on a high octane LPG, the octane rating of your next fill up could be substantially different. Thus leading to problems.

Just what I read.

[BigWillieStyles]

I have done a bit of reading and have heard/read that whilst in theory LPG does have a higher octane rating, it varies alot from servo to servo so if you get your car tuned on a high octane LPG, the octane rating of your next fill up could be substantially different. Thus leading to problems.

Just what I read.

You sure they werent talking about petrol. I reckon, petrol can vary in octane.

[aekOne]

lpg can also vary in octane rating

[tmh983]

The octane rating of LPG varies in proportion to the ratio of propane to butane. I believe this ratio varies naturally with the seasons as average temperature changes.
I remember seeing an document that had standards for auto LPG, and the minimum allowed octane RON was 102. The max you can get is 100% propane at 110RON. (i think, my memory is sketchy!)
Not having any experience tuning LPG, I would guess that you would just tune for the minimum at 102 to maintain safety.
Actually I think the newest liquid lpg systems have some sort of gas 'sniffer' device that can determine the propane/butane ratio of the gas in the tank, and therefore could provide feedback to the ecu to advance/retard timing automatically.
Google JTG liquid injection, they are the company that is selling liquid conversions in australia.

[Alex]

LPG in a turbo Subaru is like putting an umbrella up your rectum, and trying to open it.

In theory it'll work, but it'll be a pain you know where.

And people will laugh at you.

[Adam]

LPG in a turbo Subaru is like putting an umbrella up your rectum, and trying to open it.

In theory it'll work, but it'll be a pain you know where.

And people will laugh at you.

Why so alex? The only negative things I see are people saying it's bad, but never why, on the flip side, most of the positive stuff is by the JTG company and others like them, so im really curious to hear real world examples, because something like this could be the difference between selling my car cos it costs too much as a daily, and keeping it and running on LPG!

[Alex]

Because umbrellas aren't meant to go there.




Nah, in all seriousness, there's too many variables, RON for example.

On top of the fact that you'd need to go aftermarket ECU, making it an expensive and impractical solution in terms of tuning.

I mean, I'm pulling excuses where you've put your umbrella at this point... I haven't done a full evaluation of the situation.


You'd struggle to get the lot done for under $5k?



And no, I won't stand under your umbrella


ella




ella





eh




eh


ella






ella

[Adam]

Cheers!! There's no room for you under my umbrella anyway!!!

[acres]

LPG is stinky. I don't like the smell, possibly enough to prevent me from ever converting. Might be something to consider.
Could the car be setup to run purely on LPG or would a duel fuel setup be required? Mum once had a converted 80 series that had to be started and warmed up on petrol before being manually switched to LPG on the fly.

[hawks_123]

If your really that worried about fuel use don't drive a high powered turbo Subaru.
I bought for $1500 a small and cheap ford laser for driving during the week to work.
Don't worry to much about fuel now, fun driving into the servo to fill up, and then leaving before the commandore driver has even finished filling up.
You'll like your subie even better, and not wear it out as quickly.
Works good for me

[tmh983]

u don't need an aftermarket ecu to run the JTG system. You can get more power and economy by remaping the factory ecu, or converting to aftermarket, but its not necessary. I've spoken to an installer that has put the jtg system on a couple of wrx's and he reckons the results are outstanding. The cost of the conversion is about $4500 and you get $1500 back from the government, so thats about $3000 install cost, add 500 to 1000 for a remap if you really want.

[Shiv]

That is a wicked umbrella, I need one of those. All mine seem to break

[Morgan]

That is a wicked umbrella, I need one of those. All mine seem to break