Personally, I ran the BOV of of the nipple the on the side of the intake manifold, just rear of the throtle body. That is 1 of 2 vacuum sources for the EVAP emissions control system... the system that pulls evaporated exhaust fumes from the tank into the IM for burning. Replaces the need for a vented gas cap.

The vacuum supple you are referring to is the rear-most nipple on the intake manifold. It runs into the hard lines along the fuel rail, goes out to the vacuum distributor up front (the metal thing you are referring to.... one of these lines is coolant). The electrical harness I think you are referring to is the secondary air injection solenoid... It can be removed (the solenoid that is attached to the vacuum lines as they come out from the lines under the fuel rail, toward the front of the head).

I did a whole write up on how I consolidated my vacuum lines.. I will see if I can find the thread to link.

I was not able to T the BOV line, as it lead to compressor surge. My 50mm Tial needed the cleanest vacuum source possible...

John

 

Here is how i had it hooked up (Wastegate off FPR line, and BOV off secondary air line at the rear of the intake manifold. The secondary air line vacuum source did not give me good enough vacuum, and my BOV was surging (no issue on the T'd FPR wastegate line, though). I was running the BOV directly off the secondary air nipple at the rear of the intake manifold. Not sure if the nipple is too small or what, but I just ended up going with a different vacuum source. Here is how it was hooked up (wastegate on FPR line, and secondary air line dedicated to BOV. I tried it T'd off the line just forward of the FPR line as well (as can be seen in the pics). The line running from the rear secondary air nipple is running to the hard lines along the fuel rail, and is capped off at the front of the head. Its only capped because I moved the BOV line from this to the line just forward of the FPR for testing... Neither gave me a good enough vacuum source for the Tial 50mm.


Here is how it is now hooked up (and working like a champ...):
Well, seeing as the last vacuum line iteration did not work, I decided to go ahead and do what I had originally intended:

Seal up the rear-ward vacuum supply nipple. The Honda Repair Manual shows this line feeding the Air Control Valve, then the Vacuum Reservoir, then the Air Control Solenoid, and finally onto the Air Control Pump (secondary air pump). Seeing as this system was removed, none of these lines should do anything. My car does not have the Air Control Valve or the Vacuum Reservoir... I have not touched them, but the prior owner may have. The vacuum supply that the manual shows going into the Air Control Valve, then onto the Vacuum Reservoir, and finally onto the Air Control Solenoid, is instead hooked from the hard vacuum line coming out the front of the fuel rail area directly up to the Air Control Solenoid (bypassing Air Control Valve and Vacuum Reservoir). All of these lines now have NO vacuum in them, as the supply nipple was sealed up at the manifold. I could run the wastegate off this, but I am not having any issues with it in its current location, so... not broke = dont fix it.


I relocated the BOV vacuum line to the nipple that is just rear of the throttle body, on the right side of the intake manifold. This is 1 of 2 vacuum sources for the Evaporative Emissions Control system (and the associated purge valve).

I figured 1 vacuum source for that system is more than enough. I disconnected the vacuum line on the right side of the manifold from the nipple, and from the hard T joint under the manifold. I sealed up the T joint under the manifold with a properly sealed vacuum fitting (its obstructed a bit by the radiator hose in the pic below).

This system is now only getting vacuum from the nipple just forward of the FPR line on the intake manifold.

This should be the MOST direct vacuum source possible for this BOV.