DmK
Senior Member
Very detailed answer, thank you!the larger MAF housing in the Cobb Redline does not force extra compression or raise temperature inside the stock inlet pipe
it reduces upstream pressure losses, and the velocity drops in the enlarged MAF section, which lowers frictional losses before the air reaches the turbo
the irreversible losses that would convert kinetic energy into heat are minimized by the velocity stack and straightener grid
although velocity does rise again in the factory diameter pipe, the overall result is higher absolute pressure at the compressor inlet than with the stock intake
Cobb has shared test data showing the airbox pressure stays closer to ambient which lets the turbo reach target boost with less wastegate duty, lower exhaust manifold pressure, and better efficiency
i.e. the intake flows more air with less restriction and helps the turbo work more easily rather than against added losses
in fluid dynamic terms, Bernoulli’s relation for steady flow shows that lower velocity in the large MAF section corresponds to higher static pressure there for the same mass flow
the smooth contraction that follows raises velocity and lowers static pressure, yet the total stagnation pressure delivered to the compressor remains higher because upstream losses have been reduced
for typical intake velocities the associated temperature changes are only a few degrees and do not meaningfully affect compressor inlet conditions
in short, the design improves turbo efficiency rather than creating additional work for it
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