Originally Posted by
Mark Shead
What you have said is completely wrong and not from a experienced point of view. The 7064 monsters the 7163 in every area past 3000rpm there is no comparison between the two from there.
The only area the 7163 is very slightly better is at 2000rpm to 2.5k due to the exhaust flow restrictions that kill that turbo as soon as you want big boost. Overlay the comp map on both and it's as plain as day to see.
Mark
is he not talking about initial spool? Also on a YB powered 7 you can't really cool the charge enough to go over 28-29 psi so that monster mid range torque that you could have in a saph with a decent intercooler isn't an option.