So I just a question and looking to get a little insight. I got my b16 Dyno tuned not to long I'm noticing boost drop in the top end. It's just a eBay t3 50 trim nothing special. It will hit 13psi at 7800rpm then proceed to drop to 10psi at 9500rpm. Wondering if anyone else have a experience with boost drop off on a 50 trim? I believe I'm out of its efficiency range.

 

are you using a boost solenoid?

just so you know an ebay 50 trim does not equal a true 50 trim, they havent figured out how to calculate trim sizes so a 50 trim usually means its a 50mm wheel when dealing with ebay turbos

 

Yes 2 different manual boost controllers and tons of different wastegate spring combos I can achieve a higher spike but it drops regardless

 

Im no expert on turbos by any means, but maybe your turbo is choking.

 

Going right back to 2kdrift's valid argument