BLEED VALVES!!!
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Too many posts.. I need a life!!
Joined: Sep 2005
Posts: 673
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From: barnsley, south yorkshire
ok here i have a ERST running EFI managment,, i broke my amal valve so i bought a bleed valve but its a T piece one, where as the amal valve from a frst only has 2 pipes going to it,,
i blocked the one off that makes no difference when i turn the bleed valve and used the other 2,,
i cant boost above 5psi again!!!
i thought i had sorted it but i havnt as the pipe had come off from the turbo housing..
how do i set it up??
do i set my actuator fully closed??
which way do i turn the bleed valve to up the boost?
which way to down the boost?
is there a certain way the go the pipes?
have i made a mistake blocking off a pipe??
is there a guide on how to set em up,, regards dave,,
i blocked the one off that makes no difference when i turn the bleed valve and used the other 2,,
i cant boost above 5psi again!!!
i thought i had sorted it but i havnt as the pipe had come off from the turbo housing..
how do i set it up??
do i set my actuator fully closed??
which way do i turn the bleed valve to up the boost?
which way to down the boost?
is there a certain way the go the pipes?
have i made a mistake blocking off a pipe??
is there a guide on how to set em up,, regards dave,,
Dont hold me responsible if you blow up the engine but............
The way it normally works is you have it plumbed between the turbo and the wastegate.
Then with it closed, all the boost pressure in the line goes to the wastegate and actuates it open lowering boost.
When you open the bleed valve boost pressure is bled away (down through the 3rd port on yours) to atmosphere and the actuator therefore only sees part of the produced boost, which keeps the wasetgate closed until the turbo has produced the increase in boost for the bled air to equal the wastegate pressure................
so in summary,
closed - all pressure to wastegate= low boost
Open - boost bled away= higher boost
My advice is that if you plan to do this yourself only do it a small amount at a time and recheck (like half a turn until you get close then 1/4 turn or less as required). One way to do it is to hold the car in 4th gear then left foot the brakes to prevent your speed increasing and floor the throttle to check boost. doing it this way though you'll need to allow time for the brakes as well as the engine to cool between runs and only hold it for 2-3 seconds at a time.
Failing that get a mate in the passenger side to read the gauge
Goodluck.
The way it normally works is you have it plumbed between the turbo and the wastegate.
Then with it closed, all the boost pressure in the line goes to the wastegate and actuates it open lowering boost.
When you open the bleed valve boost pressure is bled away (down through the 3rd port on yours) to atmosphere and the actuator therefore only sees part of the produced boost, which keeps the wasetgate closed until the turbo has produced the increase in boost for the bled air to equal the wastegate pressure................
so in summary,
closed - all pressure to wastegate= low boost
Open - boost bled away= higher boost
My advice is that if you plan to do this yourself only do it a small amount at a time and recheck (like half a turn until you get close then 1/4 turn or less as required). One way to do it is to hold the car in 4th gear then left foot the brakes to prevent your speed increasing and floor the throttle to check boost. doing it this way though you'll need to allow time for the brakes as well as the engine to cool between runs and only hold it for 2-3 seconds at a time.
Failing that get a mate in the passenger side to read the gauge
Goodluck.
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