Re: can it be done????
anything is possible when you involve $$$ - im going to assume you want to spend as little as possible?
are you any good at welding? if you are then that will help immensly.
a turbo (internal wastegate should be sufficient) will probably be the most expensive thing you will need, followed by the manifold for it, then the piping.
PM gm destroya - he does manifolds for the 4L I6s, the 4.1 is only slightly different, i cant imagine he will have a problem with it, he should be able to knock you up a manifold for the right side of $600 plus postage (dont quote me there, im guessing, but it should be about that)
once you have the turbo in the bay, you will need to put the battery somewhere else (the boot for instance) to make room for the carby which will now be on the drivers side of the engine bay.
weither you get a webber side-draught or a holley or whatever is up to you. you will need a pipe going from that to the turbo, then from the turbo into the intake manifold on the other side - you could use a XF EFi manifold with the injector holes welded up or just the normal carby jobbie with the pipe bolted onto where the carby would normally go.
set the boost to a lowish level (5psi? 7 even?) and then just adjust the timing on the dizzy to suit the engine - you will probably want to spend a bit of time on the dyno to figure out how much boost and timing you can get away with without pinging, as opposed to doing it on the road and blowing your motor sky high. getting it "regraphed" would probably be a good idea (thats where they change the weights inside it to give more or less advance at high revs, as compared to stock)
you will probably need an electric fuel pump to supply enough fuel to the carby as well, as it will most likely be much more than the stock cam-driven fuel pump can cope with.
you will also have to maybe get a vacuume tank and a one-way valve somewhere to supply vacuume to your heating/demist stuff, and the brake booster too.
and then have a think about upgrading your diff and gearbox once they start to sh!t themselves.
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Last edited by Rollin; 03-19-2004 at 02:32.