Vacuum setup

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Vacuum setup

Postby sharkbait » Wed May 10, 2017 6:30 pm

I'm finally getting around to working on my car again and I'm trying to set up the vacuum. The car is a CQ that basically has a 3b in it running off of VEMS.
I have a short runner from Iroz, which has 1 3/8 port, 3 1/8th ports.
Aftermarket N75 valve.
Stock wastegate and stock brake booster.
Tial BOV aftermarket FPR.

With my limited knowledge of turbo cars and no idea how their vacuum works, I know the wastegate(big banjo bolt) goes to the n75 valve.
The Tial bov, brake booster,VEMS, fpr, and n75 valve all connect to a vacuum source.

I'm not 100% sure where to go from here. Should I use a vacuum manifold to supply everything? Do I need some sort of check valve between vacuum sources?
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Re: Vacuum setup

Postby ChrisAudi80 » Thu May 11, 2017 2:16 am

There is no vacuum source for the N75. One side connects to compressor pressure, the other to wastegate, third to atmosphere.
Google the diagram.

Other than that, a check valve between brake canister and manifold would be a good idea.
I would not use a vacuum manifold for BOV, FPR and MAP signal to VEMS. Better to give them each a separate nipple on the IM.
96 S6 auto
95 80Q AEB VEMS
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Re: Vacuum setup

Postby sharkbait » Thu May 11, 2017 3:48 am

the diagram for the n75 valve had just said "pressure input" so I wasn't real sure.
So best bet would be brake booster to the large portion on the intake with a check valve.
and the rest to the remaining 3 ports on the intake.
Thanks for the input here.
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Re: Vacuum setup

Postby chaloux » Thu May 11, 2017 5:38 am

sharkbait wrote:the diagram for the n75 valve had just said "pressure input" so I wasn't real sure.
So best bet would be brake booster to the large portion on the intake with a check valve.
and the rest to the remaining 3 ports on the intake.
Thanks for the input here.

Exactly. [THUMBS UP SIGN]
Matt

01 Allroad 6speed - RS4 clutch, catless downpipes, stuklr tune
04 Jetta TDI - DC stage I clutch/14lb fw
DEATH by rust - 96 Audi A6 Avant 2.5l TDI
GONE :( 87 4ktq - 4 FOX SNAKES
DEAD :( - 1996 S6 mit TDI
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Re: Vacuum setup

Postby chaloux » Thu May 11, 2017 5:38 am

sharkbait wrote:the diagram for the n75 valve had just said "pressure input" so I wasn't real sure.
So best bet would be brake booster to the large portion on the intake with a check valve.
and the rest to the remaining 3 ports on the intake.
Thanks for the input here.


Exactly.
Matt

01 Allroad 6speed - RS4 clutch, catless downpipes, stuklr tune
04 Jetta TDI - DC stage I clutch/14lb fw
DEATH by rust - 96 Audi A6 Avant 2.5l TDI
GONE :( 87 4ktq - 4 FOX SNAKES
DEAD :( - 1996 S6 mit TDI
Image
User avatar
chaloux
 
Posts: 3123
Joined: Feb 27, 2013
Location: Muskoka, Ontario, Canada


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