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986 Brake vacuum pressure

DiyEvBoxster
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DiyEvBoxster Member

DiyEvBoxster

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Hello

 

I'm in the process of converting an 2000 2.7L 986 to full electric car. I have mostly everything sorted, car is moving and working.

 

But to get it registered to road, I should prove that my new electric vacuum pump (Hella UP30) will provide enough vacuum for brakes.

 

Does anyone know any workshop-manuals or any other "definitive source" for vacuum pressure or vacuum specs for the 986 brake system ?

 

That would help me a lot, hopefully I would be able to prove that new system is adequate for brakes - certainly when driving, it feels just right.

 

Thanks

 

Henkka

 

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JFP in PA Member

JFP in PA

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Manifold vacuum is going to vary with throttle position, but at idle you should be seeing around 20+ inches of vacuum.  More than likely, you are going to need to install a vacuum reserve chamber along with the vacuum pump to assure sufficient vacuum under all operating conditions.

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