Anyone do their own throttle body balancing??

[davensocal]

I am going to take a stab at balancing the throttles tomorrow..  Anyone do this before?  I am going into it completely blind, so any advice would be appreciated.  This is for a '00 885i.



I have a set of mercury sticks, and a friend to laugh at me while I work, so I should have all the tools I need.  



Where did you sample the vacuum?  I was going to remove the vacuum lines between each body and use that as the sample point (it looks like there is a vacuum line off of each body that goes over to the airbox).  Is this just a vacuum system, or is this the idle bypass air?  It looks like the throttles are fully closed at idle, so I was a little concerned about using these points..



I was only going to sample the pressure at idle and around 3k..  Does this sound right?  



What is acceptable variance?  I was thinking +/- 5% of indicated vacuum.



Thanks!!