Bull Run
Well-Known Member
Effects of intake improvement for turbo cars
Here's a summary of an excellent article on intakes and turbocharging.
For example, if the pressure drop from the IC and piper after the turbo is 4 PSI, and pressure drop from the intake and filer before the turbo is another 2 PSI, the turbo is pressurizing air to 26 PSI to get you 20 PSI of manifold pressure.
Benefits of minimizing pressure drop before the turbo:
– Turbo spends more time in the higher efficiency islands.
– The green line extends further meaning that the turbo will flow more air without over-spinning.
– The turbo spins slower, reduces exhaust back-pressure, increases overall engine efficiency
– Turbo runs cooler at lower pressures.
– Engine is less likely to knock.
– Turbo life is extended.
I looked through my old posts and found some data related to reducing the pre-turbo pressure loss. Readings are from Cobb AP Air Filter Pressure monitor: Pressure inside of the entire intake tract prior to entering the turbo, during WOT.
With cobb drop-in filter: -0.75 PSI at 25.5 PSI of boost
Above + intake side grille honeycomb drilled out: -0.71 PSI at 25.54 PSI
Above + Airaid MIT: -0.34 PSI at little over 24 PSI
I'll log what the Air Filter Pressure monitor shows after the Big Mouth install. Note that above readings are with the stock turbo, and I'm currently running VS2+.
Here's a summary of an excellent article on intakes and turbocharging.
For example, if the pressure drop from the IC and piper after the turbo is 4 PSI, and pressure drop from the intake and filer before the turbo is another 2 PSI, the turbo is pressurizing air to 26 PSI to get you 20 PSI of manifold pressure.
Benefits of minimizing pressure drop before the turbo:
– Turbo spends more time in the higher efficiency islands.
– The green line extends further meaning that the turbo will flow more air without over-spinning.
– The turbo spins slower, reduces exhaust back-pressure, increases overall engine efficiency
– Turbo runs cooler at lower pressures.
– Engine is less likely to knock.
– Turbo life is extended.
I looked through my old posts and found some data related to reducing the pre-turbo pressure loss. Readings are from Cobb AP Air Filter Pressure monitor: Pressure inside of the entire intake tract prior to entering the turbo, during WOT.
With cobb drop-in filter: -0.75 PSI at 25.5 PSI of boost
Above + intake side grille honeycomb drilled out: -0.71 PSI at 25.54 PSI
Above + Airaid MIT: -0.34 PSI at little over 24 PSI
I'll log what the Air Filter Pressure monitor shows after the Big Mouth install. Note that above readings are with the stock turbo, and I'm currently running VS2+.
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