Vacuum source on 2.5 turbo?

[AZPete]

Where could I connect a vacuum line on a 2.5 turbo? I'm looking at Vintage Air evaporators and the smallest one uses vacuum controls.

[JeromeS13]

Anywhere on the intake inlet piping, prior to the compressor side of the turbo.

[Rasmus]

Anywhere on the intake inlet piping, prior to the compressor side of the turbo.

Agreed. There are only two sources under constant vacuum: The turbo inlet pipe before the turbo's compressor wheel and the exhaust after the turbo's turbine wheel. Everything in-between will see alternating vacuum and boost.

[AZPete]

Thanks, I'm just trying to find all my options for A/C units as there's not much space. The OE unit is big, especially for a relatively small car. The Subaru assembly line must start with the HVAC unit and then build else everything around it.

[Wayne Presley]

Use the intake manifold to feed a vacuum canister with a one way check valve.

[longislandwrx]

does it tell you how much vacuum is required?

[Goldwing]

How about the line that used to go to the brake booster?

[JeromeS13]

How about the line that used to go to the brake booster?

That line has a check valve and is fluctuates boost/vacuum.

[Goldwing]

True. Constant source? Pre-turbo, there would be very little vacuum I would think. Tap the narrowest part of the intake tract, which is the compressor inlet to get some Venturi effect. How much does it need to run? (Both Volume and pressure?). If it needs a lot of pressure but has only limited volume needs, using a post throttle plate vacuum source, check valve, and a small reservoir bottle may be enough. I recall a friend having a car that used a vacuum reservoir for power door locks. Old Mercedes I think? There really aren't many constant sources without such a setup. Just brainstorming.

[tirod]

The 90 Cherokee used a "ball" canister located behind the front bumper on the passenger side. It used vacuum for the axle shift actuator. The larger Fords, Lincolns, and Corvettes used a large tin can - literally - with fittings , and some hot rod cam vendors sell cans because carb cams with low LSA numbers don't pull much vacuum for the brakes, etc.

Pics cause it happens: https://www.google.com/search?q=vacuum+accumulator&sa=X&espv=210&es_sm=93&tbm=isch&tbo=u&source=univ&ei=m_Q7U_HbFajisATnioHgDg&ved=0CCUQsAQ&biw=1024&bih=515#q=auto+vacuum+accumulator&tbm=isch&imgdii=_