Hi i Hvae a d15b completely stock. i bought it from tigerjapanese.com. I put a turbo kit on it. it consists of a hf manifold, 14b turbo(ported a lil bit), 2in hot pipe- 2.5in cold pipe, im running crome with 450cc injectors. and the vacuum line from the intake manifold straight to the wastegate actuator. anyways i think something is wrong it starts building boost around 3000-3500 rpm and doesnt build full boost until 4500 to 4900 rpm. Do you think something is wrong? i figured there was a leak but i checked and found nothing. Thanks for your help

 

At what RPM range do you think it would be good to reach full boost?

 

charge pipes are to big on the cold side for starters, you expect that tiny turbo to fill that large charge pipe. there is a writeup about charge pipes, do a search and it talks about air speed etc.. you want ot run the smallest pipe as possible wihout the air speed goign over i think .40 mach. someone correct me on that. any event 2" cold side would have been suffecient and help with building boost quicker. the turbo is spooling and creating pressure but it has to fill up that larger cold side charge pipe before it pressurizes the intake manifold which is probably your delay in psi reading , also what shape is the turbo in?

 

well see a buddy of mine had it on his d16z6. same setup. and it was at full boost around 3500 rpms. also the turbo has very little shaft play if any.

 

Check for leaks on the head to manifold and manifold to turbo. Also do a boost leak test if you haven't aready done so.