Ivylog wrote:
I checked mine (ISL 400) on the way home today and depending on RPM I had 12 to 15 psi with the 15 at 2000 rpm. Sounds normal to me as there is still exhaust gas going through the turbo when you have the Jake on, but not as much if you have your foot in it.
Thanks Ivylog and everone else for their insites. I thought the turbo boost was always 0 psi with engine compression brake on, but I cant swear to it. Ivylog's confirmation that his does the same thing makes me feel better about it. All the other discussions helps to understand the system. Again, Thanks to all for responding.
Larry
