Difference between pounds of boost and PSI?

Question

Whats the difference between "lbs of boost" and "PSI" when talking about blowers and turbos? Ive searched and searched and searched and cant find anything.

Any help is appreciated. Thanks.

I know what "lbs of boost" and "PSI" are.

Lbs = Volume
Psi = Pressure

If you fill a car tire with 5lbs of air, it may be at 10psi, but if you fill a bicycle tire with 5lbs of air, it may be at 50psi.

Am I correct in assuming that if one cars supercharger makes 5lbs of boost, he may be running at 10psi, but if the same supercharger were on a smaller car with a smaller engine and it made 5lbs of boost, it might be pushing 25psi?

The figures are just examples.

Answer 1

The proper measure of manifold pressure is "inches of mercury". The manifold pressure guage will read atmospheric when the engine is not running and will increase when the boost kicks in. At sea level you need about 14.7 pounds of boost to overcome atmospheric pressure. If you want to double you manifold pressure check out this chart to see how many pounds of boost you need:

http://www.avdeals.com/classroom/converterpressure.htm

Answer 2

First off:

PSI: pounds per square inch. This is how much force something is producing as a constant.

Boost: When talking in the terms that you are is above and beyond atmospheric pressure.

They are definitely NOT, NOT, NOT the same thing.

PSI is a measurement as in an exacting quantity
Boost is an action of increasing above atmospheric pressure in this case.

People usually do not understand Horse Power and torque when talking about engines either.

HP is the amount of work being done over a given amount of time.

Torque is the actual force.

Boost and PSI NOT the same thing.

Think of it this way: You are standing on a scale and weigh 165 lbs. you exert a certain, constant psi on the scale. you boost your weight by holding a 50 lb bag of pennies. The 50 lb bag also exerts a psi but when added to your original weight, it boosts your measured effect.

Kiddies, go back to school this summer before you answer another question you know nothing about.

Answer 3

Different ways of saying the same thing. Pounds of boost, or pounds per square inch (of boost).

A turbo charger, which uses the exhaust to spin a turbine is usually measured in pounds of boost, while a super charge, which uses a belt to run a compressor talks of PSI, but they are used interchangeably for the most part.

Answer 4

enable's commence with what's analogous about them. Turbos and superchargers are referred to as forced induction structures. They compress the air flowing into the engine. the great thing about compacting the air is that it shall we the engine stuff more advantageous air right into a cylinder. more advantageous air signifies that more advantageous gas might want to be crammed in becuase of the gas to air ratio, so that you get more advantageous ability from each and each explosion contained in the cylinders. A quick or supercharged engine produces more advantageous ability universal than an identical engine with out the charging. With a short or a supercharger, you're starting to be about 50% more advantageous air into the engine by way of boost in rigidity. this does no longer unavoidably propose that you receives 50% more advantageous ability, because often times they're inefficient. Superchargers are easier to position in, yet are more advantageous intense priced. the significant huge difference between a turbocharger and a supercharger is its ability furnish. some thing has to furnish the flexibility to run the air compressor. In a supercharger, there's a belt that connects on to the engine. It receives its ability an identical way that the water pump or alternator does. A quick, even with the reality that, receives its ability from the exhaust. The exhaust runs with the help of a turbine, which in turn spins the compressor. there are a number of theories for both structures. In theory, a short is more advantageous powerful because it really is employing the flexibility from the exhaust for its ability source. the in basic terms element with it extremely is that turbos reason some decrease back rigidity which will provide a lot less advance till the vehicle is operating at more advantageous RPMs. desire I helped

Answer 5

There is no difference. PSI means Pounds per Square Inch, which is the same as lbs of boost!

Answer 6

Yes, they mean the same thing. Lbs is pounds, and psi is pounds. They simply measure pressure, be it in a tire or in an intake manifold. An intake manifold will normally have vacuum, unless either turbo or blower is added.

Answer 7

PSI is pounds/in on the inside tire wall in all directions equal; this tells you why the pressure is higher on a bycycle tire than a car tire if each respectively contains the same weight of air.

Boost is not related to tire pressure in any way. It is not a description of or application to anything about automobiles.

Answer 8

in you question,
psi is equal to fuel pressure,and pounds of boost (is what you get after a long mathamatical equesion) to get hp after the fuel injectors


check this site for better info
http://www.gusmahon.org/html/fuel.htm