I'm working out the final details of my L67 swap, I'm working on the vacuum lines now. Here are the questions and thoughts I have currently. Please correct me if I'm mistaken or if you have used a different/better way.


I can figure out that the port on the lower intake goes to the MAP sensor, but where should I route the fuel regulator's vacuum line?


I have the evap stuff deleted, so I'm hoping it will be okay to cap off the port I have labeled "To Evap???", unless that would be a good place to run the fuel regulator port.
I'd like to keep this clean so I'd rather not run the brake booster line in the same spot, I'd like to just cap that off and use the Northstar adaptor's port if at all possible.
Can I remove and/or plug the Northstar TB tube?
Can I use a Tee and tie the fuel regulator and MAP sensor to the lower intake or would fuel vapors screw up the MAP sensor?
I plan on just removing the boost solenoid and using vacuum to operate the boost bypass valve.

Thanks

MAP sensor and fuel pressure regulator must go to the port underneath the SC snout. This port goes into the intake manifold and will see both boost and vacuum, represents manifold pressure. I would suggest you remove the BBV solenoid, weld or bolt the lever to the horizontal position. It really doesn't do much except steal boost!

brake booster goes to the port on top of the SC. This is the most constant and strongest vacuum source.

If you already have the solenoid and canister you mineaswell connect the Evap . I still havnt hooked it up on my (canister is cracked) and the smell of fumes gets annoying after a while. Once the fuel starts circulating and warms up its going to create a lot of fumes, enough to clearly smell it if your near the car, and enough to stink up the whole garage. At the very least, vent it outside of the engine compartment if you choose not to connect the evap.

Thanks, I believe I mistaken on how the fuel regulator worked, I had some idea it vented the fuel vapor as well. That makes sense, I'll run a hose off the manifold port and tee it into both the MAP and fuel regulator. I'll re-mount the MAP sensor so I can hide it.

I image in may have the EVAP parts laying around somewhere, but I have no idea where. I'll add it later if it becomes a problem.

I'll keep the brake hose connected to the top of the supercharger, looks vs inconsistent braking seems like a no brainer.

My only thought on the BBV is keeping it so I could ease into boost with the throttle. I'd lose the solenoid so the computer can't control it. If I did remove the BBV I could probably turn the vacuum ports around and run the brake hose towards the cabin rather ran having to turn with the hose.

Anyone have any advice on why/not keeping the BBV? or any other vacuum suggestions.

Bump any other opinions?

Cap off the large port on top of the SC that was for the brake booster, use the 3/8 ports on the TB adapter to run the brake booster and block off the one on the TB.
Run hose from the small port under the SC to the fuel pressure regulator and boost bypass if you retain it and T off to feed the MAP where ever you want to mount the MAP. Run the small vacuum line off the top of the SC to the Fiero charcoal canister with the vent line to the tank still intact and remove all 3800 EVAP parts and the code from the PCM.
The EVAP system is vehicle specific mostly and the newer EVAP system does not work properly with out all three components which requires a fuel tank pressure sensor mounted to your tank of filler tube to work.
Or leave the MAP in the stock area mounted below its bracket and use the MAP bracket with a nice piece of aluminum to mount the ignition module to so stock wiring still reaches and stock plug wires also still reach.
This is my preferred route to go. Dan