Quote:
Originally Posted by Jason@JacFab
Good point. As I've already pointed out, the bosses for the turbo coolant and oil drain backs are already in the 2.5 block, just not machined. So they are using the same "mold" for the blocks, at least on the outside... Perhaps they had it in mind to do a 2.5 turbo at some point... Or perhaps, they just did it as a cost savings... Who knows...
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A 2.5L T was designed, prototyped, and tested. The theory being with the same external dimensions and mounting locations of the LTG you could effectively make the car compatible with a V6 equivalent in power without any of the packaging/engineering/supply considerations.
As many manufacturers are trying to "engineer out" V6s across their line a cost/complexity savings and make 2.0Ts the new "base V6" it'd allow GM engineers to give a car like the malibu or regal 260-270hp without breaking a sweat but if an AWD sport or GS variant needed the extra oomph a couple years into a model run you could drop a de-tuned 2.5T (to match needed power and/or transaxle torque limit) and call it a day without any headaches.