i have a turboed b16a running .7bar on stock block it boosts fine up to 5-5.5k and then starts to drop down as is goes in to vtec and then holds at about .4bar could this be because of valve float as it only happens at high rpm there are no leaks in the charge pipes that i know of.
also i heard you could tune valve float out with some adjustable cam gears if this is true any of you guys know how? cheers!!

 

What kind of turbo, what kind of exhaust, what kind of manifold, and what kind of air intake.

 

its a garrett t3 turbo
b16a2 intake b16a2 throttle bodie
b16a1 block stock internals
stainless mesh air intake
home made down pipe into a stainless high flow exhuast!

 

i forgot its a spark racing turbo mani!

 

Well what trim T3 is it? what car does it come out of?

 

mine does the same thing. Do you have gaskets between the turbo/mani? I was thinking it's because I didn't use any gaskets. Once I get some ordered well see.

 

its a recon turbo by garrett cos it was spankin new when i installed it and it had a little metal plate rivited to it saying garrett and some other ----, i cant remember what trim it is but it was an unusual one somthing like 36/64 or some near there! good for fast spooling and holding boost i was told im using metal gaskets all round.
sorry for late reply