Ok guys, so i hope i can make this as easy as possible to understand. I bought an evo and it had a hallman boost controller installed but never was used or tuned. Reason why it wasnt used was because he was selling his car, and then he gets this thing because he didnt think he would sell the car so fast. Anyhow. Its installed and has to little air vacuum tubes on it. I want to remove this MBC because i dont do nothing but stock. As far as i believe on of the tubes heads down to the wast-gate, and the other i forgot. So my question is, if i remove this thing, where do the tubes go. Like from the waste gate to what?

Please just help me out if you own a hallman and you know exactly how things work inside and out with the setup. Im sure its simple, but id rather ask.

 

You'll need the OEM boost hoses they will connect from WG and turbo nipple to the OEM Boost Control Solenoid.

The OEM Boost hoses have the proper restriction pills inside for factory mapping.

 

The vacuum lines go from the intake manifold to Hallman, from the Hallman to the turbos wastegate.

In order to remove it, you need the stock boost control solenoid. So the new configuration would be from the intake manifold to the boost control solenoid, to the turbo's wastegate.

If it wasn't tuned with the Hallman for a higher boost level, then you should be fine.


P.S. - the Hallman is an awesome boost controller. I would keep it in there if it was my car. Just make sure you have a boost gauge to verify the boost level.



-Bink

 

To add:

The Bottom port on the MBC is your input or boost source. You can use the IM (as stated above) but on a stock turbo car it will be the nipple on the JPipe/LICP. Large Frames have a nipple on the compressor housing usually.


The side port on the MBC or output will go to your WG be it internal or external

 

Well i do hear they are awesome, but i cant just sit there and crank up the boost by turning it up! Dont i have to tune it every time i turn up the boost. I have a boost gauge. And if you turn it up wont the fuel cut off? I wouldn't mind a little more input if i decided to keep this thing.

 

If you keep the boost at the stock level then you won't need a re-tune. When you decide you want to up the boost, turn the knob up and have it tuned.



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Well if i keep it stock boost, whats the point of having it.

 

just keep it installed.. turn it all the way off counter clockwise then turn it 2 turns to the right and youll be safe.

even with stock everything, youll gain a good 50whp+ with a tune and more boost. keeping the stock tune on your evo should be a sin.

the stock tunes quite aggressive and runs the car pig rich when everythings stock.

 

This is awful advice.

to the OP, if you are certain that the car has not been tuned, then search around for MBC installs and/or oem control line diagrams. You should be able to see what lines you need and where they go.

Did the previous owner leave you the stock vacuum lines? you'll need those...

OR

Just spend the $350-$500 and get a good tune. If you don't have other mods planned, the tune is a one time cost.

 

Because then you won't have to bother with changing things out now. If you leave it in, on stock boost, then your done. When your ready for more power, the boost controller is already there.


-Bink

 

do you know what 2 full turns does to a hallman mbc? its safer then running it directly off wastegate pressure, because if the gate is preloaded at all from previous owner it would cause boost creep potentially not having any kind of boost control at all. with 2 turns it will atleast run maybe 15-16psi or less and taper off to nothing.. it will run less boost then factory solenoid most likely.

 

Isnt the evo stock 18 psi

 

Here's the correct boost:
03-04s run 19.5psi at 3500rpm, which tapers to 16psi by 6500rpm
05-06s run 20.3psi at 3500rpm, which tapers to 17psi by 6500rpm


-Bink

 

Thats great info! This thread can be useful for others in the future. So lets say i turn it up to 21 psi. Everything is stock and i dont tune? What happens? I wanna run a safe engine and never run into a problem that i may have caused through this mod.

 

runs a bit leaner then stock (which his fine, cause stock runs pig rich anyways).

but you need to be properly tuned for ignition timing and etc and the tune needs to custom made specifically for your engine. ill pm you tomorrow.

just turn the boost controller all the way off for now.. if the preload on the wastegate actuator is stock it wont go past 12-14psi. just be easy with it for now.