View Single Post
      12-16-2013, 02:13 PM   #135
solstice
Major General
5457
Rep
7,037
Posts

Drives: 2015 M3 6MT
Join Date: May 2013
Location: Seattle

iTrader: (0)

Quote:
Originally Posted by JoeFromPA View Post
Because you aren't normalizing for ambient air pressure in your thinking. The dynamic cylinder pressure under boost is also a reflection of ambient air pressure's. Thus the turbo can boost higher, but cylinder pressure remains the same, as altitude increases.
No, I get that. But I didn't think there was a difference between cylinder pressure and turbo pressure. I thought 18 psi boost meant that 18 psi boosted air is loaded into the cylinders. If not, where is the 18 psi pressure?
Appreciate 0