anyone had a TR 4 cyl put on gas?

How much did it cost?

Was it worth it?

my Girlfriend a 91 TR 4cyl EFI auto with dual fuel, it runs well on both fuels and we get about 450-500km from a $35 fill (at 56cpl which is dear for lpg), and about the same from $65 of petrol.
Her dual fuel magna was fitted with LPG when it was a new car, and it is the only 4cyl gen2 with LPG i have seen, i have seen gen1's with LPG and driven one, and seen a few LPG gen2 V6's also.

Depending on what price you can get a conversion done for, how many km's you do a year and the price of LPG in your area, will determine if it's worth your while.

My girlfriends dual fuel TR is for sale PM or email me if interested (NSW rego)

how does the lpg run compared to petrol, like does it lose power on lpg?

if you tune your car so suit gas it gets more power beacuse gas has a higher octane


but no one ever does :rant:

Like Aegis said LPG has higher octane. It is hard to take advantage of this with a tradition gas mixer used on a dual fuel setup. You can advance the timing further on LPG but you have to be careful not to got too far for running petrol, I time the gf's car at 17 degs btdc and this is good on gas but the limit of what an Astron will run on ULP
Running straight LPG using something like a gas research mixer in place of the throttle body is a different story. (I have seen one of these used for dual fuel on an EFI V8 but it would hunt at idle on petrol due to no TPS.) With straight gas you need a tow truck if you run out of fuel. :rant: and you don't need pollution control gear, only a PCV

I find the gas mixer on my g/f's car actually retricts the intake at high RPM on both fuels. there is also a max fuel adjustment/restrictor in the gas line between the mixer and convertor. running the gas half a turn richer will give me equal full throttle perfromance on LPG and petrol under 4000rpm, but i get 50-100km less a tank.
If you live in the ranges at high altitude then you will use noticable more LPG than at sea level and you have to adjust mixtures for different altitudes etc to keep a smooth idle. The difference is a lot more than the same "thin air" eonomy loss on petrol.

Aegis i recently saw a Australian company doing gas only conversions, with a new Gas Injector, They replace the standard injectors and hook up the standard fuel rail to gas, no extra computers or big retunes, Aparently it Starts on gas fine, and runs better then single injection systems, he was talking $2500 for the setup fully installed, sadly can't remember the company hope it helps

if you tune your car so suit gas it gets more power beacuse gas has a higher octane


but no one ever does :rant:
tuning your car to 120 odd octain requires 13:1 compression, mad timing, big duration cam with mild lift to help idle yet have torque, 3 gas throttle bodys because gas doesn't mix with the air well.

at best you get about 90% of what you would with petrol but with LPG being alot cheaper it works out being alot better with a LPG only system, but with mildly less power.

dual fuel cars notice a fair difference in power and torque with gas compared to petrol, because petrol is still used you cant have huge timing and compression ratio's. still around about 70-80% power/torque and half the cost, hence why it is cheaper to run gas still with a petrol tuned motor.

Found it Have a look at both these sites
New Inventors
www.abc.net.au/newinventors/txt/s1345083.htm
Gas Injection Technologies
www.gas-injection.com/index.html

Wanted to do it to my car when i go to EFI fuel is 1.20 for ULP and only 55c for gas :shock:

It's always worth changing to gas as the savings in fuel costs will pay for the system in about a year or two. Especially if you convert to dedicated gas. This is also perfect for forced induction engines as the compression can be much higher.

gas doesn't mix with the air well.
That's crap! gas mixes way better than petrol!

My TR 4 cylinder was on gas, but it had a stuffed converter so i got it removed and sold the tank. My mechanic said that my engine wasn't built to run off gas and the head would need replacing eventually, which could end up negating the fuel costs anyway. I know i had trouble starting in the morning on gas when it was cold. I've heard the problem with most duel fuel cars is that the engine is tuned to run in the middle, not tuned for gas or tuned for petrol, which makes it run alot more ineffective.

That's crap! gas mixes way better than petrol!

petrol vaporises, gas wont mix unless flow is turbulent and has enough time.... 31m/s air travels thru a engine roughly.. not enough time to mix consistantly. I HAVE had a gas setup car and HAVE worked setting a GAS ONLY system up on a car before.

The petrol doesn't vaporise! It is a liquid right up until it ignites. The petrol is injected into the airflow as a fine vapour. With petrol you are trying to mix a liquid with a gas whereas with LPG you are mixing a gas with a gas. Two substances of similar energy states will mix a lot better than two substances of different energy states. And you are forgetting that there is a fair bit of turbulence when the air enters the cylinder. LPG would mix with air better than petrol. YES I do know what I'm talking about too cos I have done yr12 chem and now I'm doing mech eng at uni.