hi i got 05 g35 sedan auto with vortech s/c 8 month ago now i am getting low boost on my guage show 6psi at 6000 rpm in manuel and auto mode shifting, and 7000 rpm i shift to next gear i feel like i hit a wall for a second then it goes. it was not happening when i had s/c install. I take my car to shop they did boost leak test and there is no leak no belt slipping. Please some one give a advise what is the problem i will thanks alot.

 

what kind of boost where you running before? Which pulley are you running?

 

is stock pulley for 8psi i dont know what size is that.

 

what rpm boost should increase.

 

^Whenever you floor it. What ems do you runing?

 

stock from vortech

 

Ofcourse it will bounce out from 7000rpms, that's over your redline...And 6psi at 6000rpms with 3.33 pulley. That sounds about right. 3.33 pulleys is 7~8psi. i wouldn't worry if it's 1psi.

 

i had dyno when i had install it was 8.1 psi

 

if it is normal is ok with me, thanks alot.

 

on stock fmu can i change smaller pully for more boost or what i have to upgrade thanks.

 

Well, i had similar problem with my kit, and mine flattens at 5lbs. I replaced my bypass since I suspect it of not holding boost. I installed an HKS bypass, direct fit and sounds nicer IMO. and pretty much full boost again. You should be able to tell the difference when you're missing a few lbs of boost because those last few is when it's really pulling hard, but instead it hits a wall like you describes. I suggest you take out the bypass out and just test the diaphram. Mine was pretty soft and you can easily push it open with little pressure. goodluck