Just wanted to let anyone interested know that I am going to Supercharge one of my 318is's. I have done a few conversions on mainly Suzuki Swift GTi's which can take 125% more power on stock internals. I am unsure if the M42 will do the same, and I will be increasing boost from 7psi upwards over a period of months to see how far it will RELIABLY go.
I am going to use a Rotrex Supercharger which is a centrifugal type. It increases boost with RPM and doesn't feel quite like a turbo, but a much bigger NA car. There is no lag whatsoever with these chargers.
I have already bought an E36 318is front pulley kit (ie. PAS pump, Alternator with bracket, tensioner, water pump pulley and front crank pulley/damper with crank sensor to suit) These are all polly vee type pulleys and are needed to run the supercharger. While I am there I will fit the E36 PAS rack with pipe work for that to match. Should be a pretty straight forward conversion.
Intercooler is going to be the widest and highest I can get, but I like to keep it pretty narrow for optimum cooling. I will also be fitting an oil cooler for the engine and Supercharger. The Supercharger has its own special oil supply so I'll get some reserviors made up. I will also be getting a catch tank made to cope with any excess crank case pressures! These will go where the battery is currently fitted. The battery will go in the boot in the M3/325i sport position. Will also counter ballance the extra weight of the SC moving the battery into the boot.
I will be fitting a larger radiator and will removing the viscous fan and moving the rad further back towards the engine. This will give a little more room for the intercooler. I will also fit a slimline electric cooling fan similar to Matts car (Appletree's)
EMS wise, I will be keeping standard with exception to mapping using the Uni-Q which I already have fitted. I have also fitted this to limit the max revs which the Evolve chip has removed. I expect max power to be over 7000 RPM, so will need to play this one by ear. I will also be removing the AFM and fitting an inlet temp sensor. I will also be fitting a charge temp sensor and use this in conjunction with the UniQ to compensate the fuel and ignition maps if temps get a little warm. I am expecting the charge temps to stay well below 40C though. Again, I will need to play this one by ear.
Power wise, I don't know what it will give. I am expecting a safe 200-225ish with 6-7psi, but I will be increasing to 10-12psi eventually. But I am not going for all out power, just enough to put a grin on my face and to be able to take a pounding on track days. Remember the idea of leaving the M42 internals standard. This may change as I am thinking of fitting ARP head bolts/studs and big end and main cap bolts?
I am thinking about using a boost controller to obviously control the boost. Basically set it to say 6psi and anything over just dump it. This will allow me to get the SC spinning at max capacity at max revs. This will obviously make the SC boost more at lower RPM's. Also the boost controller will make it easier to adjust boost in the future without the need for getting different sized pulleys made up for the SC.
I need to say thank you to a few people... James at Beemer-Redeemer for the E36 parts
Tim_S for the info on the front pulleys and Appletree for the info on the Pistons. 
Cheers chaps I will post up pics as and when the project starts and throughout the work being carried out. I am not expecting this to take too long and I won't be doing the fabrication unfortunately, I am crap at things like that!
