Now a days guys are running more compression than the past,mainly because people are using electronics to control timing,& having knock sensors ,better fuel distribution & so-on.
Running a low compression engine will (for ther most part) get worse mileage, slower spoolong of the turbo,& just an all around sluggish engine.
My Syclone has 8.4:1 & is a bit sluggish when out of boost.
MBHD
Agreed.. if I was going to start my turbo 4200 project again I would stat with 9:1 minimum most likely 9.25:1. the 8.1:1 that I ended up with is lazy off boost.
