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how do you calculate psi for boost

by Francesca Dach Published 3 years ago Updated 3 years ago

How do you calculate psi for boost? Divide your required airflow by your engine's stock airflow to determine the required boost pressure ratio (the ratio of boost pressure to atmospheric pressure, which is about 14.7 psi). For the example engine, you arrive at a pressure ratio of exactly 3.00.

You can ROUGHLY estimate max boost as follows. The 0.9 factor is the ~VE for the typical intake tract under non-boosted conditions. The number 3,456 is just a mathematical factor to make the units come out properly. 1,000/546 = 1.83*14.7 = 26.9 – 14.7 = 12.2psi is the approximate max boost at 6,000rpm with 1,000cfm.

Full Answer

How do you calculate the pressure boost requirement?

In order to calculate the pressure boost requirement for our example, we need to subtract our previous two values, the required discharge pressure and the minimum inlet pressure (HI). In other words, we know the 133 psi (discharge pressure) requirements, as well as the existing incoming (inlet pressure) HI.

How much HP does 1 psi of boost equal?

Does anyone know this? I can't remeber were I saw this but what I remember is something like for each pis of boost equals 16 hp. Let me know what's up. My car looks just like this without the skirts and roof wing! Yeah baby! A general rule of thumb is 1psi=10hp at the flywheel. Good lookin out man.

How to convert psi to hp?

As for Baluch, his numbers are close enough but not for all engines. If you want an easy psi to hp conversion just divide your NA hp by 14.7 and that's it. To put it more accurately for Baluch, every 1 psi will get you approx 6.8% extra hp over a naturally aspirated setup (again, theoretical). Holy poop an 8 year old thread bump!:eek3:

How do you size a pressure booster system?

In sizing a pressure booster system, we must first determine an application’s flow and head requirements. For commercial building applications, the flow will be determined by the total number of fixtures or fixture units (Fu) being served (sinks, WCs, urinals, hose bibbs, showers, drinking fountains, cooling towers, irrigation, etc.).

How much psi is a bar of boost?

IIRC one bar equals 14.5psi (or 14.5037738 out to 7 decimal places).

How is turbo boost pressure calculated?

2:3215:52WHAT DOES IT MAKE? TURBO HP FORMULA!-ANY BOOST! - YouTubeYouTubeStart of suggested clipEnd of suggested clipTimes boost pressure divided by fourteen point seven plus one that will give you the power output ofMoreTimes boost pressure divided by fourteen point seven plus one that will give you the power output of your turbo combination.

How is boost calculated?

3:5411:06How to Measure How Much Boost You Are Running Using HP TunersYouTubeStart of suggested clipEnd of suggested clipSo what this looks like is you have to take your manifold absolute pressure you have to subtract.MoreSo what this looks like is you have to take your manifold absolute pressure you have to subtract. Your atmospheric pressure from that and that's going to equal the amount of boost you have.

Is boost measured in psi?

A boost gauge will measure pressure in either psi or bar; many also measure manifold vacuum pressure in inches of mercury (in. Hg) or mm of mercury (mm Hg).

How to convert PSI to HP?

As for Baluch, his numbers are close enough but not for all engines. If you want an easy psi to hp conversion just divide your NA hp by 14.7 and that's it.

What is the psi of a flywheel?

A general rule of thumb is 1psi=10hp at the flywheel.

How much air pressure does a car have?

On planet Earth, there is a constant air pressure, 14.7 psi at sea level (this is the base air pressure in the combustion for all non turbo vehicles). So without turbo on a car, people can honestly say they are running their cars slightly over 14psi (relative to the vacuum of space anyways).

How much horsepower does a 1.5L engine produce?

1: Take an atmospheric square 1.5L 4cyl engine that produces 250hp which is about the limits of today's technology without forced induction.

Why do you lose potential power the higher you go?

Of course you lose potential power the higher you go because you encounter more resistance in the change of inertia of the internal components.

Does turbo boost make more horsepower?

I would say no. Of course in some instances it might, but there are also cases where your hp will go down. If you're out of the efficiency range of your turbo adding more boost isn't going to do you any good. And some turbos will make 100hp more with the same, or even less boost than a much smaller turbo.

Can you calculate CFM on a turbo?

You will only be able to possibly calculate for specific turbos with specific operating parameters, but it will still be close to impossible. A larger turbo will push more CFM. Air/fuel ratio ,timing, and temperature changes will also change the outcome. There are too many variable to even fathom a solid number.

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