Flow bench
Posted: Sun Jan 05, 2020 9:29 am
Well,CRAP!!!
I semi completed a comprehensive post yesterday regarding my DIY flow bench, but the draft didn't save, so this is the short version with the figures.
(Caveat, all these figures should be treated as a rough guide only not to be compared to other figures obtained through other sources, but should be within 5% of each other measured on this bench at this time).
All testing was done at 1.25in/hg(-0.05psi) which can be extrapolated to 20in/H2O(0.75psi) (standard for TB and head flow testing) by multiplying the CFM x 4.
4 x stock RB30xx 55mm Throttle bodies 235cfm (all within 2-3cfm of each other which places them within my error bars)
Stock E15ET 42mm T/B 142cfm (stock 42mm T/B no butterfly 162cfm shaft 'open", 132cfm shaft 'closed')
Stock E15ET airfilter and airbox 117cfm (no filter 143cfm, bottom half of box 217cfm, top half of box 175cfm)
Stock TB on stock top half of inlet manifold Runner#1 87cfm, Runner#2 95cfm, Runner#3 94cfm, Runner#4 90cfm
Slightly modded top half I/M (no TB) Runner#1 79cfm, Runner#2 87cfm, Runner#3 74cfm, Runner#4 83cfm
Reverse flow modded plenum all runners 150cfm
Stock exhaust manifold reverse flow Runner#1 65cfm, Runner#2 no data, Runner#3 78cfm, Runner#4 72cfm
Lower cut half of stock inlet runners Runner#1 84cfm, Runner#2 90cfm, Runner#3 93cfm, Runner#4 89cfm
Stock NA-RB30 AFM 237cfm
Damo
I semi completed a comprehensive post yesterday regarding my DIY flow bench, but the draft didn't save, so this is the short version with the figures.
(Caveat, all these figures should be treated as a rough guide only not to be compared to other figures obtained through other sources, but should be within 5% of each other measured on this bench at this time).
All testing was done at 1.25in/hg(-0.05psi) which can be extrapolated to 20in/H2O(0.75psi) (standard for TB and head flow testing) by multiplying the CFM x 4.
4 x stock RB30xx 55mm Throttle bodies 235cfm (all within 2-3cfm of each other which places them within my error bars)
Stock E15ET 42mm T/B 142cfm (stock 42mm T/B no butterfly 162cfm shaft 'open", 132cfm shaft 'closed')
Stock E15ET airfilter and airbox 117cfm (no filter 143cfm, bottom half of box 217cfm, top half of box 175cfm)
Stock TB on stock top half of inlet manifold Runner#1 87cfm, Runner#2 95cfm, Runner#3 94cfm, Runner#4 90cfm
Slightly modded top half I/M (no TB) Runner#1 79cfm, Runner#2 87cfm, Runner#3 74cfm, Runner#4 83cfm
Reverse flow modded plenum all runners 150cfm
Stock exhaust manifold reverse flow Runner#1 65cfm, Runner#2 no data, Runner#3 78cfm, Runner#4 72cfm
Lower cut half of stock inlet runners Runner#1 84cfm, Runner#2 90cfm, Runner#3 93cfm, Runner#4 89cfm
Stock NA-RB30 AFM 237cfm
Damo