Converting 3.0SC to Turbo and EFI - Vacuum Source Points
 

This is my first venture into turbo power and converting.

Trying to understand where to take vacuum from, for things like MAP sensor and MAC valve for boost control.

Engine is a 3.0SC and is using 3.2 intake manifolds and stock throttle body.

The stock 3.2 throttle body, has 2 small nipples on the rear, below the butterfly. On the stock 3.2, these are used for fuel pressure regulator and some sort of emissions switch.

On my car, I will not be using the emissions side of things.

So with the 2 nipples, my thought was to use one to still operate the fuel press reg as well as my 3 bar MAP sensor. (would use a t piece). Then I thought I would use the second nipple, as the source for the MAC Valve.

However, some photos of generic setups I have viewed, all show the MAC valve running between the wastegate port and a nipple on the turbo compressor housing. Whilst my turbo choice (Pulsar 3076R) does not have a spot for a nipple, I imagine drilling and tapping is no big deal.

If I were to use the compressor housing, then doesn't that mean the MAC valve sees a different psi to what would be from the nipple under the butterfly?
I'm still trying to get my head around turbos...

What is the correct way to do this?

thanks in advance
Mike
https://i.imgur.com/AkdBgre.jpg

check my older posts on this subject, you'll find all the answers you are looking for :

https://forums.pelicanparts.com/911-930-turbo-super-charging-forum/1069058-my-turbo-project-adding-turbo-3-2-a.html

https://forums.pelicanparts.com/911-930-turbo-super-charging-forum/1078910-3-2-turbo-project-final-verdict-total-cost.html

Just let me know if you need any extra info, I will try to help with what I know.

HI Kamaro
yes, your thread is one of the ones 'responsible' for me going down this path!
I see you drilled and tapped a nipple to the compressor housing for your wastegate signal.
But I'm trying to understand the ' rights and wrongs' of using the boost source from the turbo, or from the nipple on the throttle body AFTER the butterfly..

Here are some pics from my EFI folder

http://forums.pelicanparts.com/uploa...1706106788.JPG
http://forums.pelicanparts.com/uploa...1706106788.JPG
http://forums.pelicanparts.com/uploa...1706106788.jpg
http://forums.pelicanparts.com/uploa...1706106788.JPG
http://forums.pelicanparts.com/uploa...1706106788.JPG
http://forums.pelicanparts.com/uploa...1706106788.JPG

[QUOTE=David;12178018]Here are some pics from my EFI folder

/QUOTE]
thanks for posting.

Seems you've also used vacuum after throttle for map and fuel press etc. and for boost, you've tapped pre throttle as well. Just from a diff spot.

I guess that's what I will end up doing too.

You need a muffler??? I have one that sounds so good.

Mike,

For wastegate control you want boost signal upstream of the butterfly. This is so the turbo is not working too hard at part throttle. I don't know whether it's better to take it directly off the compressor outlet or after the intercooler.

For fuel control you want pressure downstream of the butterfly. This is so you don't over-fuel at part throttle.

Best,
Dan

Sent from my Pixel 7 using Tapatalk

Thankyou. I think I wll take wastegate/controller signal from between intercooler and TB.