Map Sensor Vac Line For Gt40/cobra Intakes

[a50ina50]

Has anyone put a GT40 or a Cobra intake in a speed density car? I'm ASSUMING someone has. Where did you connect the map sensor vacuum line too? My original intake has a specific port for just the map sensor vacuum line. I'm assuming it has to stay by itself and I cant tap into another vacuum line. If you have any pics for what you did it would help a lot.

 

[Mustang5L5]

Just needs to connect to any manifold vac source except EGR and Fuel pressure Reg and the charcoal canister (I realize this doesn't leave much left to use)

I hooked mine up to s spare port on the vac tree, although I would recommend direct manifold vac

 

[jrichker]

I would advise using a dedicated port for the MAP sensor and here is why. Every time some vacuum operated device like a A/C-Heater control, power brake booster or cruise control operates, it causes the vacuum to vary on that line/port. Since Speed Density depends on steady vacuum, the variations in vacuum can cause unpredictable results. The most likely result would be a sudden surge that would be hard to trace and diagnose.

A dedicated direct tap into the upper intake manifold would be the best solution. There is a lot of volume in the manifold to help maintain a steady vacuum without the sudden changes in vacuum that occur on a vacuum line shared with other devices that use vacuum to operate.

If you are clever, use can change the arrangement of the existing vacuum plumbing or have a hole drilled and tapped for a 1/4" pipe port to use for the MAP sensor.