The first thing to do, just like any project is to gather information.

I would highly recommend starting with reading these books:

Maximum Boost by Corky Bell http://www.amazon.ca/Maximum-Boost-Desi ... 0837601606


Turbochargers by Hugh MacInnes http://www.amazon.ca/Turbochargers-Hugh ... 729&sr=1-1


Turbo: Real World High Performance Turbocharger Systems by George Matly http://www.amazon.ca/Turbo-World-High-P ... pd_sim_b_2