Im not sure if this is a Electronic Issue or a Leaking Issue... but....

Hey guys.... i got the Hallman MBC installed in my car during the summer, and well i've been leaking boost ever since. The MBC is cranked all the way to the peak... and in 1st gear it goes to about 1.5bars (21 psi) and and steadily goes down to 1.2 bars (17psi), and every gear after that goes to about 1.4bars and DROPS to 1.2. Now i'm losing alot of power bc of this. I thought a MBC would solve the problem of the 5,000rpm boost drop, but i guess not. Im thinking its leaking through the Intercooler piping rubber hoses, but im not sure. Any ideas why my MBC is cranked to the max and only runnin 21psi and leaking to 17psi? Im saving money up for a POWER FC, but im not sure if its a Electronic issue or a Leaking issue. I got the RMR intercooler piping sitting in my trunk waiting to get installed, hopefully that works... but other than that... im slow.

 

Check your intercooler pipes and buy a better diverter valve.

 

diverter valve? is that the BOV? cuz i got a greddy type s (single spring)

 

You know... I have the exact same problem. The only difference is I'm using the Perrin MBC. I would go over all of your intercooler connections again and have it pressure tested. I'm still trying to diagnose my boost leak... only mine's actually audible and it happens in every gear... everytime I get on throttle.

 

yah i have it in every gear too.... and im not sure if im hearing the boost leak or not because my intake and turbo is so damn loud. I hear the SPOOOOOOOOOOOOOL... im not sure if i hear the boost leaking.

 

Try a better sealing BOV.

 

Try the MR BOV. Mine holds boost great

 

Greddy Type S has been known to have problems over 18 psi.

 

how much do the MR bov costs? and what do they sound like?!?

 

I have the 1G BOV and Perrin MBC. I hold 21 lbs the about 20 to redline.....ROCK SOLID!

 

Boost leaks are very hard to troubleshoot. I would start by looking at the BOV. Add the second spring back in there and see if you will hold boost. If the same problem still exists then you should start going over all of your IC piping. Start up by the throttle body and go over all of your clamps under your hood. Also, check the ones coming off of the turbo. If that doesn't work then you will have check the ones going into your IC. I would say at this time go ahead and install your IC piping kit since you have evrything tore down. Don't forget to check the clamps and the piping going to your BOV.

 

thanks fella's... i think this weekend im gonna tighten up all the clamps... BOV, IC hoses, and everything like that... if that doesn't work... than im gonna take it in somewhere and have them check it out after i install mY IC piping

 

Pop the hood while the car is idling and listen for air leaks. I had a vacuum hose leak from my boost gauge and was losing boost pressure. And get rid of the MBC and get a Profec B...just my opinion...

 

The mr bov cost me 120 + shipping. I got it at http://www.kingofimports.com. The bov sounds just like the stock plastic one. Where are you in OC. We can meet up and you can just hear it for yourself.

 

KU did you solve your problem because i just installed an MBC and having same results, I receive an MR BOV in a week,