gas carby

[kevspec]

hi i have a vn 5ltr dedicated gas and would like to know the best gas carby to suit it should have bout 460 + hp at flywheel any thoughts would be appreciated

[dzach23]

vn's are fuel injected so no point looking for a carburetor....

[Not_An_Abba_Fan]

vn's are fuel injected so no point looking for a carburetor....

Did you not read his question? It's LPG, the injectors no longer operate.

IMO, the best system to get is liquid gas injection, but it's expensive to set up. LPG doesn't use a conventional carby, so there is no "best" carby to get. The largest possible throttle body and winding up the volume of LPG is your best bet. Having a dedicated tune will get the best result though, LPG doesn't require a timing curve like petrol, the timing advances up to about 2500rpm, but after that it is a flat line. Look at getting a memcal done by nicefrog on Ebay, (used to be Greenfoam on here).

[kevspec]

it is full carby manifold no gas injection just lpg only i already have a chiptourque memcal and i also have a full procomp ignition setup so the computer doesnt really do much anymore

[Not_An_Abba_Fan]

I would talk to Gas Research, they do twin LPG carbs that work very well. Or you can go to a four barrell throttle body fed by the converter.

[Circlotron]

LPG doesn't require a timing curve like petrol, the timing advances up to about 2500rpm, but after that it is a flat line.

At full throttle maybe, but there is a lot you can do to make it run nice at part throttle. This is a pic of the gas curve I have.

[Circlotron]

...and the table if anyone is interested.