RB25 on LPG

[retrotec]

With the price of fuel becoming a joke I'm keen at changing the RB25DET to LPG.

With 107-109 there would be no problems with octane ratings, the only place that i can find that does Efi style of gas conversions are these guys:

www.gas-injection.com

PS: Look at the 20V 4AGE

Are the valve seats on Rb25's strong enough for cope with LPG and has anyone done it before?

i'm keen to see if it can be used with a powerfc :confused:

[lwells]

Your problem with direct gas injection is that their injectors are limited to 33kw a piece. So its not going to be a very powerful RB25DET... That's on top of all the other issues with LPG that have been mentioned in other threads in the last week.

LW.

[always_me]

who says you have to only use only 1 injector per cylinder, custom fuel rail and 2 injectorsper cylinger will flow 400kw at flywheel easy

[lwells]

who says you have to only use only 1 injector per cylinder,  custom fuel rail and 2 injectorsper cylinger will flow 400kw at flywheel easy

Who says that their management system can cope with that?

LW.

[always_me]

nothing is for sure but anything is possible, there are controlers for extra injectors and even 2 extra injectors, Ems can custom make their computers, maybe they can make a 6cylinder twin injector capable computer

[retrotec]

nothing is for sure but anything is possible, there are controlers for extra injectors and even 2 extra injectors, Ems can custom make their computers, maybe they can make a 6cylinder twin injector capable computer

I believe LINK do something similar, the advan r33 GTR/GTS4 uses 12 injectors.

[always_me]

see i dont see why its not possible. maybe someone who had a little more experiacne with computers can look into it a little further

[mini2]

Have anyone actually got a Skyline running on gas? I'd be keen to find out also...

[retrotec]

issues with LPG that have been mentioned in other threads in the last week.

Nothing comes up under a search for LPG, could someone tell us the other problems associated with LPG?

[mini2]

Higher octane but lower energy output per (something unit..I failed chemistry) Correct me if I am wrong, just having a stab at the question.

[always_me]

yeah i think thats sounds about right, i have gas in my van and its a nugget, i wanna burn it every day

[Sydneykid]

This is my post from the other thread on LPG for RB25;

Based on our experience with other LPG powered cars;

You will need to be carefull with your LPG supply, in the push to keep LPG prices low the octane ratings are not what they used to be. We were seeing over 104 ron about 4 years ago, now it is not unusual to get as low as 95 ron. The market for LPG is dominated by taxis and delivery vehicles where cost is important, not the octane rating.

The RB25DET has a 9 to 1 static compression ratio.

If you are doing it for a cost saving, then be aware that it will take a minimum of 150,000 k's to break even on the cost of a high performance conversion at current petrol and LPG prices.

It is also worth noting that the distance travelled between tank fills (asumming the same litreage) is considerably shorter due to the lower calorific value of LPG. Plus you are looking at a 40 to 50kg weight gain in the necessary hi pressure tank and components. This will require an upgrade in the rear spring rates which will compromise traction and handling due to the shift in weight balance. In addition there is a 75mm reduction in ground clearance if the tank is underslung (that means no lowering). Or a ~65% reduction in boot space if it is mounted there.

Hope that was of some help