Pressure tested the car today, as soon as i attached the compressor set at 22psi.....the Hallman Pro RX started blwoing air out of the little hole in the side of the upper nipple. I figured, well im not running 22psi so its not set that high, maybe its a safety feature some sort of blowoff or something. Nope, turn the regulator down to 15psi......still leaks. Blew out of there all they way down to about 4-5psi. ANy ideas?/



Sean

 

Ok - try to follow me here, because this can get messy.

A boost controller is supposed to allow air to escape the boost circut. When a boost controller is allowing 100% boost it is passing 100% of the presure to the vent. When it reaches a point were it's supposed to "vent the boost" what actually happens is that it stops venting 100% of the presure and starts letting presure pass through the boost controller and reach the wastegate. The presure reacing the wastgate is what is what causes the flap in the turbo to open and reduce the presure of the intake charge.

With an Evo you generally shouldn't need to have the Hallman boost controler plugged into the intake circut at all - it just runs between the downpipe nipple (Hallman "in" line) and the wastage input (Hallman "out" line). I've had one configured this way for a while now.

 

Um no. That's not how a hallman boost controller works. what you are describing is a bleeder type boost controller. (inferior)

without a boost controller, your wastegate actuator would just see boost pressure from the intake manifold on the vacuum line. That pressure pushes against the diaphragm/spring in the actuator. your boost pressure would be = to the spring pressure.

a hallman boost control put inbetween the boost pressure source and the wastegate acutator regulates the pressure that the actuator sees. the boost controller has it's own little ball and spring in it that is adjustable for preload on the spring. when you increase the preload on the spring, it takes more boost pressure to push the spring in, thus increasing your boost at the intake manifold.

once the boost pressure source gets high enough to push the ball/spring and compress the spring, that pushes the ball off the seat and allows the boost pressure to get to the wastegate actuator and cause it to open. that makes the boost go down slightly.

there is a little vent hole in the boost controller that allows it to "reset" every time the actuator opens and the boost drops. in reality, the boost controller and actuator "reset" or open and close many many times a second.

anyway, that little hiss/leak you hear from the hbc is totally normal and is part of how the controller works. if you want to block off the boost source line while testing for intake leaks, that is fine. gets rid of the noise so you can hear other leaks. I pinch the line with a vise grip.

 

I didn't realise that the Hallman wasn't a bleeder style controller.

The rest of the info is correct though - If you install the Hallman between the nipple on the down pipe and wastegate you don't need to tap into the intake side at all.

Here's the vaccum diagram from the manual:

 

This is by no means a lil leak, this thing is dropping about 5-6psi in about 20 seconds. Like i said, it holds boost fine with my finger over the hole, so i guess ill take a shot at pinching the hose. Which hose? From the bottom of the Hallman or the one from the side of the hallman?

 

How exactly do you have the Hallman hooked up in your car?

 

Like the instructions say to hook it up. Between the Wastegate and the Turbo

 

Cool - was just wondering. The downpipe nipple goes to the end directly opposite the adjustment wheel - the wastgate connects to the connector on the side. I'm sure you know that, but I figured I'd toss that out in case anyone else was wondering.

If you spin controller to the minimum boost setting, the line from the downpipe should hold all the presure you can throw at it. At the maximum boost setting presure should be passing through to the other side.

 

Its supposed to install from the waste gate and they gotta t-bone it to the line that runs from the BOV to the intake manifold, I bet thats your problem!

 

Little more detail please?

Something like this? https://www.evolutionm.net/forums/sh...d.php?t=114794

 

A few questions:

Did you just install the Hallman, or has it been on a while?
If on a while, what boost have you been hitting?
Which spring is installed?
What position is the MBC knob set to?

 

use heavy spring. you can hit the boost like 28 psi with stock turbo with heavy spring. light spring won't hit more than 14 psi.

 

It has been installed for about 2 months, im hitting about 20psi with about a half a turn to go on the knob. It has whatever sping was in it installed. Ive been having some concern, cause ive got a ton more mods then my buddy, and his car feels like it pulls a lot harder then mine. I know my gauge is right, with the regulator on the compressor set to 20 psi, the gauge was reading right, and i even checked it with another seperate gauge.

 

take the mbc apart and clean it, there might be crap thats preventing the ball from sitting on the seat to make a good seal.

 

https://www.evolutionm.net/forums/sh...&highlight=mbc

Use the diagram for connection between the BOV and wastegate