grumpy im converting my 350ci sbc to Turbocharged MPFI useing these parts
The goal is 700hp
.
Whats the rule of thumb when choosing throttle body size?
The intake elbow opening is 90mm should i just get a 90mm tb to put on there? Will a 90mm tb support 700hp?
You know i just realized i need to look at the cfm my engine requires vs the flow of a 90mm tb! any input on would be great tho. thanks grumpy
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with a TURBO, your cramming high pressure air thru a throttle body, not relieing on outside air pressure to fill the void formed in a cylinder by a rapidly desending piston to fill the cylinder, 90mm will be fine in your case, certainly not a huge restriction with a turbo on only 350 cubic inches of displacement, or put another way,a throttle body with a 90mm bore has a cross section of approximately 6375 sq mm of area, while a dual 58 mm throttle body used on my corvette has about 5293 sq mm of area, or only 83% as large and I know of several guys that are well over 800 hp with turbos on engines running those throttle bodys.
90mm - 1287 CFM
rated flow BEFORE you go using a TURBO to cram air thru it, in theory with about 20 psi of boost that throttle body size should very easily support over 1500hp
The goal is 700hp
.
Whats the rule of thumb when choosing throttle body size?
The intake elbow opening is 90mm should i just get a 90mm tb to put on there? Will a 90mm tb support 700hp?
You know i just realized i need to look at the cfm my engine requires vs the flow of a 90mm tb! any input on would be great tho. thanks grumpy
--------------------------------------------------------------------------------
with a TURBO, your cramming high pressure air thru a throttle body, not relieing on outside air pressure to fill the void formed in a cylinder by a rapidly desending piston to fill the cylinder, 90mm will be fine in your case, certainly not a huge restriction with a turbo on only 350 cubic inches of displacement, or put another way,a throttle body with a 90mm bore has a cross section of approximately 6375 sq mm of area, while a dual 58 mm throttle body used on my corvette has about 5293 sq mm of area, or only 83% as large and I know of several guys that are well over 800 hp with turbos on engines running those throttle bodys.
90mm - 1287 CFM
rated flow BEFORE you go using a TURBO to cram air thru it, in theory with about 20 psi of boost that throttle body size should very easily support over 1500hp