OR....I could be talking out of my ass(wouldn't be the first time and won't be the last). I don't know if I used all the correct terms or if I'm even close to right. https://www.nopistons.com/forums/pub...1047683561.gif I'ts just my theory. Please correct me if I'm off. https://www.nopistons.com/forums/pub...IR#>/bigok.gif

My understanding is that that over 4000 rpms or so if the smaller turbo is making at least 7psi of boost or so an actuator switches over to the larger turbo.



Someone correct me if I'm totally wrong.

Both turbos are the same... Or I thought they were... from what I read..

well, from what i know, the primary turbo boosts up to 10psi then it switches over to the 2nd turbo, thats why there's a 10-8-10 pattern...... 8lbs is the switch over..... then the second turbo takes it the rest of the way

Close.



The primary turbo boosts 10psi to 4500... then the transition to NON-SEQ occurs where both turbos COMBINED make the 10psi of boost.