[ChubbsWrld]

Whats up everyone? I am getting close to finishing the EG build. Trying to get the last wiring, routing and details done. One of these details is a vacuum distribution block. I sourced the blocks vacuum from a large port on the Skunk manifold. The turbo I am using does not have a port in the housing so my initial thought was to source its reference from the distribution block. My concern is that the blocks source is on the intake manifold, after the throttle body. So when the throttle is closed will my distribution block still give an accurate reading to things like my wastegate, boost gauge, etc. I guess in a more direct way to ask this is if it is okay to get the vacuum/boost for these things from the intake manifold or does it need to be from the intercooler piping prior to the throttle body?

 

[bumpstick]

It should be fine to plumb it off the IM. For all intents and purposes the pressure in the lines is traveling at the speed of sound. There should be no delay or pressure drop unless you seriously oversize your hoses

 

[slo_eg8]

 

[ChubbsWrld]

Thank you, so the wastegate does have to get its source prior to the throttle body. I'll have to weld a bung on the intercooler piping.

 

[ChubbsWrld]

It should be fine to plumb it off the IM. For all intents and purposes the pressure in the lines is traveling at the speed of sound. There should be no delay or pressure drop unless you seriously oversize your hoses

That's what I initially thought too. But what I am thinking now is that the wastegate needs to reference the pressure prior to the throttle body, that way it sees the increased pressure in the charge pipe when the throttle plate is closed. If the wastegate is getting its reference after the throttle body, it would not see the increased charge pipe pressure when the throttle is closed and thus would not respond appropriately. I could be completely wrong but the more I look the more I see it sourced prior to the throttle body, if not directly off the turbine housing.

 

[drtalon123]

Thank you, so the wastegate does have to get its source prior to the throttle body. I'll have to weld a bung on the intercooler piping.

Does your turbo compressor housing not have a place to install a barb fitting for hoses?

 

[ChubbsWrld]

Does your turbo compressor housing not have a place to install a barb fitting for hoses?

No, it doesn't.

 

[mattliston]

vacuum check valve. Find an oem one that can be bought brand new.

Plenty of GM and Dodge cars have easy to source ones.

Vacuum reservoir would not be a bad idea as well, to maintain your brakes under spirited driving. THe brake booster does not hold enough vacuum, for me at least. Again, older GM cars are perfect to source vacuum tanks. THey look like big plastic marbles.

 

[dfb399]

No, it doesn't.

Grab your favorite size pilot drill, a letter "Q"-size Drill bit, and a 1/8 NPT tap.
Choose a location that makes sense and doesn't interfere with anything, and make your hole.
Drilling/tapping Aluminum is very easy, no doubt you can do it.
Obviously, make sure chips do not go into the Compressor housing.

 

[ChubbsWrld]

Grab your favorite size pilot drill, a letter "Q"-size Drill bit, and a 1/8 NPT tap.
Choose a location that makes sense and doesn't interfere with anything, and make your hole.
Drilling/tapping Aluminum is very easy, no doubt you can do it.
Obviously, make sure chips do not go into the Compressor housing.

Yeah, I've considered that as well. I'm gonna look at it a little today to see exactly what I want to do. I ordered the PWM stuff and a 4 port boost solenoid last night so the plumbing will wait a few days until I get it all in and mounted. I'll either tap the housing or weld a nipple to the charge piping.

 

[dfb399]

It is apparent you do care about good boost control.
Keeping all those hoses as short as possible (by Tapping a source @ the Comp. housing) will only help that characteristic.

 

[ChubbsWrld]

It is apparent you do care about good boost control.
Keeping all those hoses as short as possible (by Tapping a source @ the Comp. housing) will only help that characteristic.

I do absolutely care about good control. This will me my wife's first built daily and I need the ability to adjust and control things that will greatly impact street driving. I am going to look at the compressor housing when I get to the shop today and see where I can tap it.

 

[ChubbsWrld]

I tapped the housing, now I can keep the lines short. Ill use the distribution block for BOV and boost gauge. Thanks for the help guys.