I am going to install the hallman pro rx MBC do i have to use the heavy spring with the ceramic ball or i should use the light spring. I would like to boost 19.5 to redline.

With the mbc full close i read in some post that i should boost about 11 pounds. aprox., how many full turns do i have to move the knob to reach 19.5?

 

heavy spring.

2 1/2 then go from there.

 

yes you need the heavy spring, not sure on how many turns. do you have a boost gauge?

 

I have the small spring and turn + to max. I'm stuck at 19 PSI.

So will need to install the Heavy spring

 

I have a boost gauge i boost 19 without mbc but over 5500 rmp the boost drop to 17, for now i'm not planning boost over 19 can i use this with the light spring.

When you order the hallman rx pro it came with the heavy spring installed or with the light.

 

if you order it from www.boostcontroller.com it comes with the light spring installed, but also has the heavy spring for an easy replacement / switchout

 

ehheeh

 

you don't need to use the heavy spring. i boost 20.5 with the lighter spring.

 

It will come with light spring installed. It only takes a minute to put in the supplied heavy spring though. I couldn't even get to 19lbs with the light spring. You'll definitely want to install the heavy spring..

 

wow, am i the only person who is able to hold over 19psi with the lighter spring?

 

I guess you're just too farking legit, dude...

 

i guess so

 

Nope...I boost to 21psi and hold with the light spring

 

what boost gauge you guys using? Are you sure you're not just spiking to 21psi with light springs then tapering?

 

I'm using the Defi-D gauge.

I try today again to boost over 19 PSI with light spring, and I'm still stuck at 19.5 now. I check everything, no leak or whatever. Boost keep to 19.5 PSI all the way.

So I guess no leak problem.