Anyone know if there is some direct coorelation or at least good estimation of the effect of a given amount of backpressure on a turbo motor? I'm talking about back pressure AFTER the turbo.
Something like 2.5psi of back pressure equals 5% loss of HP over 0psi of back pressure (open turbo).
I ask because I found this great program where you can calculate the exact amount of back pressure in a tube. You can't count the muffler, but all the tubing for a given flow. You can even input the bends, as even a mandrel 90 degree bend will have more resistance than a straight pipe.
It's here: http://www.pressure-drop.com/
Also, I was wondering if anyone knew the conditions of air as it enters the downpipe? Aprox temp, pressure, density? If the car is at 20psi, will the air be ~1400F and 20psi, or atmospheric pressure and 1400F? It makes a big difference on the CFM out of the turbo, which is the most important variable.
Something like 2.5psi of back pressure equals 5% loss of HP over 0psi of back pressure (open turbo).
I ask because I found this great program where you can calculate the exact amount of back pressure in a tube. You can't count the muffler, but all the tubing for a given flow. You can even input the bends, as even a mandrel 90 degree bend will have more resistance than a straight pipe.
It's here: http://www.pressure-drop.com/
Also, I was wondering if anyone knew the conditions of air as it enters the downpipe? Aprox temp, pressure, density? If the car is at 20psi, will the air be ~1400F and 20psi, or atmospheric pressure and 1400F? It makes a big difference on the CFM out of the turbo, which is the most important variable.