Supercharging a high mileage M3

[M400DPC]

Im looking to buy an E46 M3 with a view to supercharging it. The car Im looking at buying currently has all the track gubbins APs, suspension, exhausts, manifolds, cage etc... It's mileage is currently 90k (on the original engine) and has spent the last 30k miles of its life as a track car in the ownership of the previous 2 owners. Most of the track time has been Nurburgring and Spa. Thus, the latter 3rd of its life has definitely not been easy...

My question is what steps would I need to take to avoid the engine detonating when supercharged? Can I simply forge the internals of the existing 90k engine i.e. is it a simple case of getting forged pistons, rods, bearings etc plus machining the block and the heads? Will the engine have seen too much wear for this? Will it need a complete rebuild?

As for costs, I know I will be in for £7k as a base cost for the supercharger alone. Anyone know what rough costs for forging and/or rebuilding?

Cheers all

[M400DPC]

k-ink said:

That is a chunk of change to spend if you rebuild it as well. Would an LS conversion be much different?

True but Id want to keep it purist. If I had the money Id have a supercharged CSL sat next to an M5 V10 CSL....

Still haven't ruled out the v10 conversion but it's getting hold of someone to do it for sensible money

[M400DPC]

750turbo said:

q

OP, are you seriously thinking about this, or just dreaming like we all do at times?

Seems a good way to turn a lot of cash into a little cash possibly?

Yes very serious. Agreed, it will be cash spent never to be seen again but these things are easy to justify when you're a petrol head