Hello,

I'm swapping a JDM ITR into my previously GS-R-swapped LS. I'm nearing the end of my swap and gotten all of the electronics and coolant lines connected.

The throttle body is a Skunk2 Alpha B series and the intake is a ported ITR. I'm following the typical ITR setup as near as I can determine.

The lower firewall-side TB coolant port is connected to the passenger side of the IACV, with the other IACV port connected to the copper coolant bypass on the block. The lower front-facing coolant port is connected directly to the small coolant port on the IM flange (I'm not using the weird pipe that's welded to the valve cover breather).

For the vacuum system the PCV valve is connected to the nipple on the front center of the IM. The firewall-side center nipple on the IM is connected to the brake booster. The firewall-side nipple closer to the passenger side (directly over the IACV) is connected to the purge control solenoid, the other port of which is connected to the vapor canister. I'll connect the valve cover breather to a CAI.

All that leaves a single vacuum nipple on the top of the throttle body right next to the MAP sensor. I know this isn't there on stock ITRs. How do I connect it? I can't remember how my GS-R was and the Helms manual has me confused. I'm struggling to understand the vacuum diagrams. Do I cap it? Tap it into one of the other lines?

I know this is a stupid question. I've tried searching for this but I keep coming up confused.

 

That's for the vacuum line from the charcoal canister. Cap it or tap it and run a grub screw in with sealant