[quote=gatewright]Thanks for your reply. I am seriously considering changing my roadster to a new + 4 GDI for similar reasons to Heinz, my only niggling doubt is the reduction in HP, all other aspects of the car are fine,.
Alan.
I think the answer is a mechanical supercharger: this would up both power and torque without requiring the massive inter-cooler a turbo needs.
As the 2.0L GDI is really the Ford Ecoboost without the boost it is perfectly capable of being pushed towards 200bhp and 200 ft lbs, which is more than enough.
Well.......yes and no. Air/water intercoolers are more compact and as efficient as air/air. Requirement for an intercooler is a function, mainly, of air compression and subsequent thermal rise regardless of whether the air is compressed by a super or turbo charger. So both benefit from the density increasing effect of an intercooler, though a turbo slightly more so because of exhaust gas heat transfer. However, most modern turbos are water-cooled by being plumbed into the engine cooling system anyway. The US-derived GDI crate engine used in the Plus 4 is not just an Ecoboost without the turbo. It runs different pistons with a higher compression ratio and different cam profiles. The c/r ratio would have to be reduced for turbo or supercharger use.
