Reply to thread

Message: [QUOTE="silverpsd_06, post: 221582, member: 1011"] The second stage at 14.7psig would be running a PR of 2:1, but the first stage at 25psig would also be running a PR of 2.7:1 (25psig + 14.7psia / 14.7psia). And when you compound, the first stage would take in air at 14.7psia and compress it 2.7 times, yielding 36.69psia (25psig). The second stage then takes in this pressure of 36.69psia and compresses it 2.0 times, yielding 79.38psia (64.68psig). So in reality, a pressure ratio of 2 from the second combined with 25psig from the first stage results in just a hair under 65psi on the manifold. This is your post from psn chuck.. Now if my math is correct the first stage is making 25psig or your 2.7 pressure ratio =39.69 psia, now the secondary takes in 39.69 and compresses it twice so that would equal 79.38psia which would yield 64.68psi at the manifold? Is that correct? Your example was different I didn't know if it was just a typo way back when or there was some reason I was not seeing why it came up different for me on the first stage math? [/QUOTE]

Verification

Random media

n1335447039_30451405_445427

2011-02-26_16-42-21_15

472434_368013399986900_30235268_o

misc_2013_114

511-1

RSK

2013-01-15_10-57-39_16

2012-04-06_12-35-26_374

1511MG-1601

Latest posts

Won’t start
- Latest: psduser1
- Yesterday at 11:33 AM
7.3 Tech & FAQ
GT37 Turbocharger w/10 blade turbine, billet comp.
- Latest: hskfab
- Friday at 1:24 PM
Engine and Drivetrain
Hard steer question/issue
- Latest: psduser1
- Jun 5, 2025
7.3 Tech
B
WTS/WIF light flash and stall issue
- Latest: blickcd
- Jun 5, 2025
6.0 Tech
T
2013+ steering gearbox in older trucks
- Latest: TPOLO
- Jun 4, 2025
Suspension, Drive Train, and Tires

Members online

No members online now.

Total: 330 (members: 0, guests: 330)

Top