Tom-05-MR

iTrader: (1)

I just picked up a Forge MBC and I'm trying to determine whether to hook the intake side to the stock location on the turbo (per this how-to) or T into the line between the BOV and the intake manifold (like this). I know that many people recommend the BOV line because it's an accurate reflection of manifold pressure. Makes good sense to me: getting your pressure from the turbo means it hasn't gone through the intercooler yet, so you'll wind up with variation from ambient temperature and how hard you're driving the car.

What I'm wondering is, if tapping the line from the BOV is better, why does the car tap into the turbo from the factory? What are the pros and cons of each location? Will tapping into the BOV line affect BOV functionality?

Mike@Forge

iTrader: (23)

We don't recommend and you don't want an intake manifold reference to the boost controller.

While being an acurate source of manifold pressure, it's also an acurate source of manifold vacuum and you don't need nor want vacuum referenced to the boost controller nor actuator.

You want only a positive pressure source.

The only place to get that is from the turbo outlet/discharge pipe.

Another negative to sharing the boost controller reference with the valve line is when the boost controller actuates, sending a signal to the actuator to open it, it will pull pressure away from the reference to the top of the valve which is needed to help keep the valve sealed under load. This will create a stutter or lapse in the sealing of the valve and subsequent loss of boost pressure.

More here:

https://www.evolutionm.net/forums/sh...d.php?t=209640

Deezee

I just installed mine as mike said, and I have NO issues what so ever.

hondafan

iTrader: (25)

yeah, i went right off the turbo nipple.