Davezj
01-04-2009, 09:22 PM
Has anyone tested there MBC before fitting it?
i Have just bought an MBC i know how to connect them up and i have a boost gauge to tweek it on the car, so that is not a problem.
The one i have bought is a 2 pipe valve with a small hole in the boddy of the valve to release pressure.
It is a ball and spring type, take the screw valve end bit off, you then have a ball, spring, metal coller round the spring, ball at the bottom, is the normal?
me being me i thought i would bench test it before i fit it.
Testing:-
setup is a compressor with a regualetor controling the pressure with gauge to show boost pressure going up and down (i will call the Inlet Pressure=IP), connected to the MBC, then into a gauge to show what waste gate actuator pressure is (i will call this Wastegate Pressure=WP). all stated pressures will be in PSI
what happened would you expect to happen?
did an inital setup by setting the IP=12 and adjusted MBC to give WP=7.
IP=1,WP=0
IP=2,WP=0
IP=3,WP=0
IP=4,WP=0
IP=5,WP=0, Slight leak from hole in valve.
IP=6,WP=1, slightly more of a leak from hole.
IP=7,WP=2, slightly more of a leak from hole.
IP=8,WP=3, Leak inreases evry time the IP is increased.
IP=9,WP=4
IP=10,WP=5
IP=11,WP=6
IP=12,WP=7
IP=13,WP=8
IP=14,WP=9
IP=15,WP=10
IP=16,WP=11
IP=17,WP=12
IP=18,WP=13
IP=19,WP=14
exactly the reverse occurs when IP is reduced.
1. with the valve starting to open at IP=5 this will this make the turbo's to spool quicker will it not.
2. seams to be a linear response. But the air being released by the hole in the valve body is massive, or seams to be.
3. Now i presume that if the MBC was fitted to a turbo with a wastegate, when the wastegate opening pressure is reached (7psi ish) the inlet pressure would not have risen any more. with WP=7 would have given IP=12.
does this seam resonable, and how does it compare to others that have been tested.
i Have just bought an MBC i know how to connect them up and i have a boost gauge to tweek it on the car, so that is not a problem.
The one i have bought is a 2 pipe valve with a small hole in the boddy of the valve to release pressure.
It is a ball and spring type, take the screw valve end bit off, you then have a ball, spring, metal coller round the spring, ball at the bottom, is the normal?
me being me i thought i would bench test it before i fit it.
Testing:-
setup is a compressor with a regualetor controling the pressure with gauge to show boost pressure going up and down (i will call the Inlet Pressure=IP), connected to the MBC, then into a gauge to show what waste gate actuator pressure is (i will call this Wastegate Pressure=WP). all stated pressures will be in PSI
what happened would you expect to happen?
did an inital setup by setting the IP=12 and adjusted MBC to give WP=7.
IP=1,WP=0
IP=2,WP=0
IP=3,WP=0
IP=4,WP=0
IP=5,WP=0, Slight leak from hole in valve.
IP=6,WP=1, slightly more of a leak from hole.
IP=7,WP=2, slightly more of a leak from hole.
IP=8,WP=3, Leak inreases evry time the IP is increased.
IP=9,WP=4
IP=10,WP=5
IP=11,WP=6
IP=12,WP=7
IP=13,WP=8
IP=14,WP=9
IP=15,WP=10
IP=16,WP=11
IP=17,WP=12
IP=18,WP=13
IP=19,WP=14
exactly the reverse occurs when IP is reduced.
1. with the valve starting to open at IP=5 this will this make the turbo's to spool quicker will it not.
2. seams to be a linear response. But the air being released by the hole in the valve body is massive, or seams to be.
3. Now i presume that if the MBC was fitted to a turbo with a wastegate, when the wastegate opening pressure is reached (7psi ish) the inlet pressure would not have risen any more. with WP=7 would have given IP=12.
does this seam resonable, and how does it compare to others that have been tested.