Originally Posted by
Rick
My NMS head gave me 210bhp @ 11psi @6000rpm with power still climbing, compared to 210bhp at 17psi i was running before. On the same day as i did the 210 11psi run, another engine i'd built with a std head running 18psi did 200bhp. The gains only get bigger when you increase the boost. It also lowered my boost threshold by nearly 500rpm.
Rick.
Good comparisons Rick cheers!
It lowered your boost threshold by 500rpm!! I thought if anything it would have raised it as a result of a drop in port velocity? So it must have felt more responsive and less laggy than with the standard head?
I'm aiming for 220-240bhp depending what my metering unit can fuel for really, so my boost will be whatever it needs to be to make that power vs the VE of my engine, but what i dont want is more lag as a result of having a high flowing head as Stu has suggested.
I want a balance between flow and response, I dont want to run too higher boost as this will give me higher temps, increasing flow will drop the boost and as a result the temps but i dont want to lose response
I'm thinking maybe a ported head but with standard valve size's?
What was the spec of your NMS head?? If they can supply me with one that gives me more response low down (drops boost threshold) and higher flowing then thats the way i'm going!!!!
