1974 xl tc 250 cortina
Join Date: May 2004
Location: Wheeelers Hill, Victoria
Re: Turbo... carby VS EFI & lpg setup
WARNING; novice at large (me).
Mate I have been very interested in this same topic for awhile.
What I have come up with is this;
LPG blowthrough system on a straight gas research carb, custom plenum intake, intercooler, one convertor is enough for your 7 psi, done. LPG is cheaper to run, you can run a higher compression due to higher octane. No computer. Just ignition control (ie haltec.). No worries with emissions.
EFI new injectors, new fuel pump (sometimes two), fuel pressure regulator, new computer, more expensive to run, have to run lower compression. Potentially massive worries with legality due to emissions.
Mate, for me its such an easy decision I really cannot believe why there are not many, many more lpg turbos out there.
You would think about going the efi route if you car was already on efi and you only planned on running 7 psi. But for anything else LPG is hard to ignore.
Only thing that is really an issue is if you go on any interstate trips and you cant make it from one servo to the next. But that would only happen if you went way off the beaten track, so it should be cool.
also LPG tax coming in at 2008 (I think) is something to think about too.