I would tend to consider anything below 300 @ the flywheel a basic conversion, After this barrier you will nedd to start thinking about gearboxes (Atspeed Racing will be selling be4 conversion kits very soon, pm for more info) and clutches a bit more. You should ALWAYS research what parts you will be placing onto the car so everything is matched and will work and aid other parts of the build. You will need to look at cam profile, compression ratio, turbo size, head work and in order to spec something good.
Running the compression too low will give less real power in the low down revs, this in turn would slow down gas speeds exiting the engine and therefore increase the time it takes to spool the turbo up. Run the compression to high and with a dodgey bit of mapping your engine will detonate! The idea cr to run would be 9:1
Cam profile, this is something that has to be selected carefully on certain specs, Standard cams are pretty good for turbo applications, they provide a nice healthy lump of power in the mid range all the way up to 7600 rpm. However go with a wilder cam and you will start to see more top end gains and potentionally a bit more lag!
Now if your ever thinking about going above and beyond the 400- 450 bhp marker this is where you enter a completely new world. I wont say to much about this as not many people would probably consider it. So if you have any questions post them up or pm me.
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