Quote Originally Posted by VXorado View Post
No its a pretty clever question and after thinking about it for a while, I didn't have a good answer.

Heavy VX= bad canidate for a 4 cylinder

I4 smaller/lighter than 3.5L= good weight shed for VX

I4 turbos= possible annoying turbo lag (maybe not since there's 2)

I4 more HP= that's all good

I4 better MPG= also all good

Sky/Solstice short production run= that engine could cost big $$$

Too many pros/cons to make a stance. I think its a great idea as long as the extra 45HP goes to the wheels. Then again the MPG alone may make the swap worth it.
Often top HP numbers don't tell the whole story. For a 2-ton vehicle, torque is an important consideration. It doesn't matter how much HP you generate if it takes 20-seconds getting it from 0-25mph. (IOW if that HP doesn't happen until higher rpms)

Responsiveness is usually a product of cubic inches and compression. OTOH, I haven't driven a dual turbo 4-cylinder.