LS1 air consumptiom
base airflow rate = (cid*rpm*.5*VE)/1728 = ___cfm
pressure ratio = PR = (14.7 + boost)/14.7
boosted airflow rate = PR*base airflow rate = ___cfm
cfm*.069 = #/min (standard)
finding your correct VE for your heads and FI set up is critical.. can range from .7 to 1.x... through my accel dfi calculations mine is right at .91 at that boost level.
CID = 346
PR at 7psi = 1.476
VE = .91
max rpm = 6500
this would give a #/minute for my set up of 874.17cfm * .069 = 60.31 #/min
at my current boost level of 17, my VE is .93 so my #/min is about 90
also.. if you know your compressor efficiency then muliply that by the ideal PR to get the real PR.. i didnt do this in my calculation because it is skewed by intercooling quite a bit.. and i have a really good intercooler.
pressure ratio = PR = (14.7 + boost)/14.7
boosted airflow rate = PR*base airflow rate = ___cfm
cfm*.069 = #/min (standard)
finding your correct VE for your heads and FI set up is critical.. can range from .7 to 1.x... through my accel dfi calculations mine is right at .91 at that boost level.
CID = 346
PR at 7psi = 1.476
VE = .91
max rpm = 6500
this would give a #/minute for my set up of 874.17cfm * .069 = 60.31 #/min
at my current boost level of 17, my VE is .93 so my #/min is about 90
also.. if you know your compressor efficiency then muliply that by the ideal PR to get the real PR.. i didnt do this in my calculation because it is skewed by intercooling quite a bit.. and i have a really good intercooler.
Last edited by MIGHTYMOUSE; Sep 1, 2004 at 11:42 AM.
Launching!
Joined: Dec 2001
Posts: 289
Likes: 0
From: Wallingford, CT
That's an interesting table.
I see 53 at 8. I would have guessed 50 at 7 psi.
According to that table, its 5,900 rpm at 50, 7. Thats about where I stopped the dyno pull.
My actual numbers are very very close to that table.
I see 53 at 8. I would have guessed 50 at 7 psi.
According to that table, its 5,900 rpm at 50, 7. Thats about where I stopped the dyno pull.
My actual numbers are very very close to that table.
