Originally Posted by
CossieRich
I'd be quite surprised but pleased if someone bolts on a bigger turbo than mine on a standard ported head and didnt encounter surge and have to cap the boost.
My T66 is on a standard ported head peaks at 2.2 bar (on the road) 1.9 bar (on the dyno) and doesn't have any surge, but yours does make about 70 BHP more
Rich