WHICH ONE ??TURBO vs compressor

If retro-fitment to a Beemer, than I think it's more a case of which is easier to buy, install and configure. If your question is 'general' then simply put, a compressor or supercharger is more self contained, works a slightly different way to a turbo and not so much in the way of cooling required. Both require ecu programmes to operate, both apply massive input pressure into the combustion chamber. However it has been more economical for tuners to develop 'bolt on' SC's for BM's rather than turbo - so the short reply would be 'compressor'.

It's a strange situation though especially as the Japanese have turbo'd most of their 4 or 6 pots over the years. Still either method can be expensive to live with. A recent poll on the BMW magazine forum was summarised by Peppernick - he knows superchargers and confirmed they can be expensive and as much work as any turbo to live with.

Thanks guys I'm put off a super charger only reason is the agent for Active Autowerks in the southern  UK used to do or also does VAUXHALLS and when I had a cavalier all I ever heard was people saying bad things I have had first hand experience as well so I guess its going to be a turbo unit where the best place to go for info and for purchase

It weren't the engine that i had the problem with it was the guys at REGAL AUTOS if you go on any UK vauxhall web site they haven't got a kind word for them as far as looking at coupe.com I cant as my name IE, madman is used by someone else and for some reason my password is wrong I have tried to contact the moderator with no success so i cant even the browse the site if you know how to help me just let me know anyway yes I would prefer to go with the supercharger as I have had turbo-ed cars in the past and this would be a bit different thanks

get a rotrex supercharger, small easy to install. failing that, get a turbo setup, with a cartech 2025 for the fueling etc. supercharger is easier, turbo has more potential.