on an exhaust system what is back pressure. what does it mean when a car loses or gains back pressure?
138606
Back pressure is basically the pressure in the exhaust manifold. You'll get back pressure because the exhaust gases are in an exhaust pipe that have to run through a catalytic converter and muffler and possibly a turbo charger if one exists on your car. Actually the turbo charger is run based on the pressure that exists in the exhaust.\n\nTypically you gain back pressure when you've got a clogged cat or poor flowing muffler or damage to the exhaust pipe.\n\nA loss of back pressure occurs due to leaks. You can also reduce back pressure by placing on things like high flow mufflers.\n\nBack pressure is typically bad because your pistons are trying to push the exhaust gases out of your engine and it has to contend with the back pressure in the exhaust pipe.
47905
blow off valves make that noise when the transmission is not connecting the engine to the drive wheels regardless of if it is shifting on its own or being shifted manually.  however it a auto shifts are very quick so it will not be the long dramatic pshhhhhhh like in a manual
195367
There are several upgrades on the aftermarket for your application check with BDS or Bully Dog you can find upgrades for exhaust,computer,turbo,tranny, and more at summitracing.com or try jegs.com
1078650
The pulsating flow from each cylinder's exhaust process of an automobile petrol or diesel engine sets up pressure waves in the exhaust system-the exhaust port and the manifold having average pressure levels higher than the atmospheric. This varies with the engine speed and load. \nAt higher speeds and loads the exhaust manifold is at pressures substantially above atmospheric pressure. These pressure waves propagate at speed of the sound relative to the moving exhaust gas, which escapes with a high velocity producing an objectionable exhaust boom or noise. \nA suitably designed exhaust silencer or muffler accomplishes the muffling of this exhaust noise. The basics of silencing can be understood by recalling a few principles of physics. The velocity of sound in the gas at a given temperature is directly proportional to the square root of the product of the pressure and the ratio of the specific heats (at constant pressure to that at constant volume), and inversely to the square root of the density of the gas. \nAs the temperature varies, the velocity also varies directly as the temperature by another square root law involving the product of the coefficient of thermal expansion of the gas and the temperature. The exhaust noise can be reduced appreciably by providing resonance chambers to offset the noise wave effects. Since it silences the noise to be produced by the exhaust air . it is called silencer.
4088
because the air inside the car is moving with the car
398883
Turbo is a good way to increase your car's power. Also, a bigger intercooler as well as new piping kit will help moter breath better. A new air filter will give you some extra power. A good exhaust and a new ECU program will help you a lot. After these your power must be 500+ PS, believe it or not. I have seen M3 over 1000 PS.
872115
It could mean back a car up as go in reverse.\nIt could mean back up as in your a real fine lady when you back that thing up, meaning put her rear toward you.\nIt could mean back up as in start over when something isn't working out as you planned.\nYou didn't give context, or I am sure I might have been more thorough.
831050
One is for making car body which can easily return to its original configuration anfter an accident. Usually heating of the body (e.g. by hot water) can cause it to gain its original shape.
982697
It means you have an air leak in your emission system. No big deal, quite often a gas cap not sufficiently tightened. That will give you some idea of the problem.
205402
Gross Horsepower is also known as Brake Horsepower (BHP) or flywheel horsepower. This is the power an engine makes on a test stand, with no transmission, differential or axles in between the flywheel and the dyno.  Net Horsepower would be the horsepower readings taken at the rear wheels of the car on a chasis dyno. \n\nThe gross horsepower is always higher than the net, and can be as much as 25% higher, depending on the efficiency of the transmission and drive train.
602071
No atmosphere is needed. The exhaust and rocket push against each other. Think of two weights held together with a clamp but with a spring compressed between them. When you release the clamp the spring pushed the weights apart. Each weight pushes off of the other weight and they both move away from their common starting point. This is what the rocket and it's exhaust do, push each other apart.
69000
Answer is wear & tear... Old cars have engines which has undergone wear will have loses throgh pistons,valves, gears etc. Due to improper/inadequate maintenance, frictional losses will be higher with time. With proper maintenance of cars/equipments you can keep fuel consumption low.
210508
Basically you lighten the load on the spring on that side. In theory that should help the handling of the car. \n\nBuddy Baker explained the difference between "LOOSE" and "TIGHT" in simple terms. He said when the car is TIGHT you see the accident (head on into the wall) and when the car is LOOSE you don't see the accident. (You back into the wall)\n\nDennis
413558
Yes,but it's providing downforce to stick car to track better.The car is going to cut the air,and you sure don't want it to go under,then car would lift up and get airborn.
330682
Condensation - the warm moist air in the car cools down and when it 'hits' the glass colled by the outside air and leaves a film, then drops of water.
162370
Losing the a/c pump will not gain horsepower if you don,t (it free Wheels when off)turn it on, a/c will draw up to a small % loss even when on\nyou will not notice it, only when you first turn it on the other thing i am thinking about here is you cant guess this stuff over a coumputer, need to see what realy broke !, a smog pump will draw less then 1/4 horse power, a dino will not even pick the up, besides the air pump is there for a reason, it cool combustion temp and ehx temps its a freind to your motor, dont belive otherwise. send photo of damage i will tell you what to do next, p/s that car is plenty fast from the factory, speed kills so keep it stock
818902
You better read something on this:\nhttp://en.wikipedia.org/wiki/Pressure