I took the measurement of the lower IM runners: 38mm
Multiplied by 6 to get: 10.548 sq in. of area total for all 6 runners.
Now say you build an upper manifold with plenty of volume, but wanted to find a single Throttle Body to match the lower plenums 10.548 sq. in. of area.
Stock 50mm = 3.043 sq in. (wow, only 1/3 of the area :roll: )
240sx 60mm = 4.383 sq in.
65mm = 5.143 sq in.
75mm = 6.848 sq in.
85mm = 8.795 sq in.
95mm = 10.987 sq in. (winner?)
A 95mm TB typically is good for over 1200hp, so there's really no reason to port the lower manifold.
Multiplied by 6 to get: 10.548 sq in. of area total for all 6 runners.
Now say you build an upper manifold with plenty of volume, but wanted to find a single Throttle Body to match the lower plenums 10.548 sq. in. of area.
Stock 50mm = 3.043 sq in. (wow, only 1/3 of the area :roll: )
240sx 60mm = 4.383 sq in.
65mm = 5.143 sq in.
75mm = 6.848 sq in.
85mm = 8.795 sq in.
95mm = 10.987 sq in. (winner?)
A 95mm TB typically is good for over 1200hp, so there's really no reason to port the lower manifold.
Comment