hi there i have a hallman MBC pro and i install it exactly the way described in this sketch. anyways. i am haveing problems, this is it; i went out on a test drive and my car doesnt pass 4500rpm i hear my hks exhaust poping because it cant pass this certain rpm(4500rpm) and when i accelerate the turbo lagggggs bad!! and my turbo gauge reads 0.......15... then jumps to 21(where i want it)and back at the 10s psi and and the 4500rpm stops me from going further, so i need to shift and the lagggi prosess starts all over!! what the hell is wrong!!

ps. i have a greedy type-s with the 2 springs still in it. i checked and re checked all the vacum lines they r securly ziiped tied!!


help me guys!!!

 

does your hallman looks like this ?




you need to have the little hole to look like this

 

you might need a heavy spring
https://www.evolutionm.net/forums/sh...d.php?t=120185

 

Boost cut - you need a tune !

 

I hooked the hose up to the nipple on the turbo and did not "T" off the line from the intake manifold to the BOV. I think you can hook them up a number of different ways so maybe try and see if that helps. Al is right though, you need a tune to get rid of the boost cut. Everytime the weather gets colder I boost 1 or 2 psi higher and I hit boost cut so I'm constantly adjusting my MBC. The Dynoflash tune is the way to go.

 

yes it does have the hole mention, in the MBC. this problem is wierd cause it also gave me the CEL light on! does it matter the size of the vacume hose?