Liquid Gas Systems for our Zeds, can it be done?

http://www.skylinesaustralia.com/forums/topic/201267-my-r34-gtt-lpg-skyline/

Copied from Skylines forum

just thought i would post some info on my r34 gtt four door that i converted to lpg injection.

it runs a power fc, piggy backed by a prins gas ecu. which drives 6 gas injectors (hopefully 12 soon)
i have a 50lt tank in the spare wheel well which gives me 370k's at 70c a lt @ 100+ octane.

the only problem with gas (in a street car) is that a LEGAL gas tank is limited to about 300kw max.

i have attached a pdf of my car when it was dynoed, it shows both the gas and ultimate 98 graphs as it is dual fueled, if it was dedicated gas it would be alot better.

shane @ force fed gas in cockburn perth installed the system http://www.forcefedgas.com.au/. Great bloke great service, we both learnt alot from the install.

since installing the set up i have done about 5-7000 klm's and would deffinitly spend the $5000 again esp since we get $3000 back from the government.


regards

chris

 

I have the "vapour injection" as it's called in my wife's VY Commodore. Very good performance & economy. Donut tank where spare used to be. These days you can have the scuba tank which is bigger.

Liqiud injection is much better but unless you can get a kit, it is too expensive. Been down that route with a previous car (only considered it that is, but did the research). You get silly power & economy but way too expensive. Even the vapour is pretty pricey but yeah, cheap as......

 

in fact it could go like this for a LPG dedicated zed

VG30DETT
6 x Keihin LPG Injectors
1 x VS1 regulator
Nistune tuned to 12psi boost.

RB25det with 12psi on stock turbo and LPG made 240rwhp with 12psi

VG30dett being 20% larger capacity effectively might make 20% more in results with similar spec giving 288rwhp at 12psi which isnt bad on BBQ fuel

And imagine upping the boost and paying 68c per litre hehehehe

 

You can see the three injectors connected to the tubes which are connected to the actual nozzles drilled into the intake runners, so 6 runners = 6 nozzles = 6 tubes = 6 injectors. The injectors are fed by the Regulator, types of these are called VS1. The regulator is fed by the LPG lines from the tank.

So like a normal high HP application alot is to do with the fueling, high HP means high flow fuel lines and high flow injectors etc. or more of each. You can buy all these parts online fit them up and then take to an LPG shop to get it running and tuned - Nistune anyone

 

Yeah true, 48 months aint TOO bad I guess but still, I guess it also depends how fast (which is damn fast currently) fuel prices go up will take less time to pay it off, also as a bonus it passes through emission tests with flying even with 0 pollution gear on there.

As for the usage per litre etc economy side of things, I know duel fuel is less, vapour was suppose to get the same and the new direct injected lpg is suppose to get better again (from what I've read / heard)

 

Be pimp :drool:

 

I spoke about direct gas injection with my 4x4 mechanic, he said don't bother trying to run the vg30dett on "lpg only" due to the age of the motor (Unless you run a valve saver system)...however what he did recommend is a system used for putting diesels on lpg, its called ECO Shot.

ECO Shot mixes fuel with LPG which see's a boost in HP and more distance from your fuel tank as its mixed with lpg, as its mixed with the fuel it helps preserve the internals. He has installed heaps of these kits on diesels, and the last time i spoke with him (couple of months ago) he was installing an ECO Shot kit of a V8 Petrol.

He also said the kit wouldn't work without an after market ecu, and wide band 02 sensors...The price of doing it outweighed the benefits for me as i rarely drive my TT, just thought i'd mention it.

Cheers Andrew

 

If you rarely drive the car there is no point at all, but as its my only car I drive it a few times a week (and for those that use it as a daily) its something to consider, specially since fuel is only going up in price.

Got another place that said its possible and some info on it

http://www.orbitalautogas.com.au/liquid_LPG.html

Government rebate is $1500 till 30th June 2011 then drops to $1250 and capped at 25,000 vehicles yearly, currently there is no cap

 

Just contacted Orbital Autogas and was told their trial is only for 2000+ age vehicles. Holden Ford and bitofshitty..ops mean Mitsubishi.
Quote: "unless the 300zx becomes popular they don't think they will be doing a kit for that car, too old - sorry"

 

I looked into this yesterday as it looks a attractive way on getting more power with less strain to the motor. Something i like

Quote from Ultimate Gas Conversions

We can convert that vehicle for $3790 before rebate, which is $1500,
until end of June when it drops to $1250, so after rebate will be $2290.
We fit a sequential vapour injection system which results in no power
loss or backfiring as well as excellent economy. The tank is 50lt usable
donut which goes in the spare wheel well and a Smart Spare puncture
repair system is included to replace the spare. Conversion will take 2-3
days and we have loan car available if needed. There is a 3 week wait at
the moment and that's quickly getting longer as the reduction in rebate
gets closer. Please call with any further queries or to make a booking,
thanks

 

50/L

donut, so your not from the sticks, because 50l of gas wont get you to the local shop and back home.

 

LPG has a significant excise subsidy. There are a lot of people who want that subsidy cancelled and the money saved used for more targetted anti-pollution schemes. There are a lot of those people - they are everywhere.

I heard some argument today about Perth taxi-drivers (I think) saying their industry will be destroyed if the LPG subsidy is cancelled. I was under a Zed at the time and didn't catch it all.

With all of that going on, and it has been going on for some time, who would think now about going LPG? I strongly suspect that sooner or later LPG is going to end up the same price as petrol.

 

I would like a duel fuel system not dedicated gas.
Do you have the contact details for the two workshops?

 

40lt of usable gas would get you 350klm if its an injected gas system then 400klm.
A duel fuel system is better if in the country.
On the trip to Goulburn I was watching the last 1/4 tank and distance like a hawk, hoping the last 60 klm would not run out. (good friday aswell, not too many open)
Love my daily falcon with duel fuel I don't care if I run out of gas, as long as I have a 1/4 tank of petrol to switch over.

 

50L is a bit small.
Would be great too see a bigger donut tank size.
The tyre repair kits idea seems great. That could deduct the need for a spare wheel.

 

I'm running a tyre repair kit called NRMA
The only way to fit a bigger tank would be to fit a flat floor and bigger tank underneath or replace the 300 wheel well with a falcon/holden wheel well. (commonwhore parts in a nissan)

 

That was weird, I got an answer back today and said he could do it