2ndgensilver

hey i have a mbc the u control from inside the car and i was wondering if anyone had some pics of where the 2 hoses go to cause im really not sure. please post on here or email me at no.pistons@hotmail.com thanx in advance for your help.

RoninRX7

the hoses go inbetween the turbo and wastegate. You tee the MBC into the line that has pressure hooked up to the wastegate. Thats pretty much all there is to it. On my turbo, the line going to the wastegate is tapped into the compressor housing, and runs straight back.

2ndgensilver

im not really sure what all that is. ive always had 12a's and this is my first turbo that im doin things to (had one that i kept stock)

MidnightOwl

Look for the actuator for the wastegate, it's goldish. The vacuum tube running to it is what you need to tap into. It's easier to get to with the fan shroud and fan taken out of the car.

RETed

Danger...
MBC's in the cockpit adds unnecessary (hose) length which will cause boost spiking.


-Ted

Turbonut

iTrader: (1)

This is true if the hose runs into the compartment, but my Hallman has a cable to the controller, so no long hose.

2ndgensilver

my car has been running way to much boost (14 pounds) and i need to lower it that why i bought this.

Turbonut

iTrader: (1)

You can't lower the boost with a controller. You can only raise the boost.

bryanfc

You need to port your wastegate or restrict your exhaust.. or get an external wastegate.

Ted, would the same thing apply to mechanical boost gauges mounted in the cabin?

tomoaac

A boost controller of the type that connects into the vac hose can ONLY raise boost. This is beacuse it merly lowers the negative pressure seen by the wast gate actuator. Ie keeps the waste gate closed until a higher negative pressure is produced before the boost controller.

Think of a water tap, without the controller the tap is fully open, with a controller the tap can be adjusted but only to slow the flow down. What you deffinately cant do is increase the flow beyond the normal fully open position.

Solution: Fit a HKS adjustable waste gate actuator, Seen them for around $100 with them you can both raise and lower boost.

RETed

Sorta, kinda...but it the case of a boost gauge, it's a little different effect.
Because of the length of hose from the engine, it damps the initial boost spike, so the gauge will read "slower".
Now, can your brain interpret the difference? I doubt it...
Now, don't panic...this is actually "good", cause it prevents the needle from jumping all over the place - the gauge actually had a steadier readout.
Some boost gauges actually come with a restrictor pill that does the same effect, moreso.


-Ted