Ok, we are about to embark on a rebuild project for my friends 911SC street twin turbo.
Heres what we are contemplating:
Scrap the CIS and fit a 3.2 Carrera manifold for aftermarket EFI ECU
Aftermarket fasteners throughout
Twin plug the heads
New PhBr valve guides
New valve springs
New retainers
Option 1 - Slip in 97mm 930 7.0:1 pistons/cylinders (modify oem rods accordingly) for 3.12L capacity
Option 2 - Retain the stock 8.5:1 pistons/cylinders and just limit boost to 1.0bar.
Option 3 - Use 1.0mm or 1.5mm shims under the cylinders to reduce CR to 7.5:1
Question: which option do you guys think is best for a street turbo that may see occassional track events?
Which path would you take? Discuss?
