I have a problem the boost out of my stock twins and i wanted to see if you could help me. The boost on the first turbo is fine and hold nice at 10psi but after 4.5k when the second turbo comes on the boost will go down to about 5psi and by redline there is no boost at all. and if i boost it past 4.5k and let off the turbo will make a lound funny noise. My mods are cat-back and intank.

Thanks Mark T

 

start checking vauum hoses. that loud noise is probably your stock BOV

 

Be sure to look at your check valves and make sure they're not busted. My FD was is doing the exact same thing. Looked at a hose diagram and found out that the check valve between the Y-pipe and the pressure chamber was completely busted. As soon as I get my check valves and install it, I'll let you know if it fixed my problem

 

You think my stock bov is broke? bc it does't sound like the stock bov. I had my car for over 4 years now and this is my first boost problem

 

I don't know where the check valves is but im going to find it

 

Check the big hoses first... if no luck:

there is a sticky here with the whole sequential system. I has all of the vacuum hoses, solenoids, valves, everything. Use that in combination with the worshop manual (it is also a sticky) and start trouble shooting. I think that you most likely find a cracked hose or something.

 

the crv is not closing when the ccv opens after 4500. all the boost is prob going out the crv. check the hose going to it.

 

The noise is only made after i let off the gas.

 

If it was your factory BOV you would'nt have primary boost either. Like said above check your CRV to make sure it' closing or even the hose from the y-pipe to the CRV. You'll most likely find the hose from the y-pipe to CRV split.

 

The hose is cracked. Wheres is best place to buy one..dealer?

 

You can go to any automotive store and get them to find a preshapped one of same size and aproximate shape for less.