A Question for those running Turbos
01-20-2008, 01:35 AM
#2
5th Gear Member
Join Date: Dec 2006
Location: Redding, CA
Posts: 4,552
RE: A Question for those running Turbos
I can't speak for the brake booster portion but I can comment on the PCV valve.
My kit (STS) has two phases: An inline filter and a shut off swich that closes the line under boost. Since the air intake is pressurized where the PCV comes in, it would cause boost to enter the top of the cam cover and then go the wrong way through the engine.It shutscloses the line @1 psi and turns back on when under vaccuum.
I haven't really paid attention to the brake booster portion but I can see a "T" fitting put in there that runs to the boost controler.
I didn't know what the hell the entire contraption was until I read the instruction manual and it made sense.
My kit (STS) has two phases: An inline filter and a shut off swich that closes the line under boost. Since the air intake is pressurized where the PCV comes in, it would cause boost to enter the top of the cam cover and then go the wrong way through the engine.It shutscloses the line @1 psi and turns back on when under vaccuum.
I haven't really paid attention to the brake booster portion but I can see a "T" fitting put in there that runs to the boost controler.
I didn't know what the hell the entire contraption was until I read the instruction manual and it made sense.
01-20-2008, 07:05 AM
#3
6th Gear Member
Join Date: Sep 2006
Location: Gainesville, FL
Posts: 11,278
RE: A Question for those running Turbos
ORIGINAL: Simon1
I can't speak for the brake booster portion but I can comment on the PCV valve.
My kit (STS) has two phases: An inline filter and a shut off swich that closes the line under boost. Since the air intake is pressurized where the PCV comes in, it would cause boost to enter the top of the cam cover and then go the wrong way through the engine.It shutscloses the line @1 psi and turns back on when under vaccuum.
I can't speak for the brake booster portion but I can comment on the PCV valve.
My kit (STS) has two phases: An inline filter and a shut off swich that closes the line under boost. Since the air intake is pressurized where the PCV comes in, it would cause boost to enter the top of the cam cover and then go the wrong way through the engine.It shutscloses the line @1 psi and turns back on when under vaccuum.
01-20-2008, 09:13 AM
#4
3rd Gear Member
Thread Starter
Join Date: Feb 2006
Location: Fenton, MO.
Posts: 645
RE: A Question for those running Turbos
ORIGINAL: Simon1
I can't speak for the brake booster portion but I can comment on the PCV valve.
My kit (STS) has two phases: An inline filter and a shut off swich that closes the line under boost. Since the air intake is pressurized where the PCV comes in, it would cause boost to enter the top of the cam cover and then go the wrong way through the engine.It shutscloses the line @1 psi and turns back on when under vaccuum.
I haven't really paid attention to the brake booster portion but I can see a "T" fitting put in there that runs to the boost controler.
I didn't know what the hell the entire contraption was until I read the instruction manual and it made sense.
I can't speak for the brake booster portion but I can comment on the PCV valve.
My kit (STS) has two phases: An inline filter and a shut off swich that closes the line under boost. Since the air intake is pressurized where the PCV comes in, it would cause boost to enter the top of the cam cover and then go the wrong way through the engine.It shutscloses the line @1 psi and turns back on when under vaccuum.
I haven't really paid attention to the brake booster portion but I can see a "T" fitting put in there that runs to the boost controler.
I didn't know what the hell the entire contraption was until I read the instruction manual and it made sense.
Thanks for the input.
Now, your setup seems logical until we get to the part where as boost and HP ramp up. How is pressure relieved from the crankcase at WOT. Its gotta go somewhere.
S/C dont have this problem because vacuum is available at the S/C intake after the throttle body. But when they do go to WOT excessive pressure can build up in the crankcase, possibly forcing the pcv to open or for the pressure to escape through the passenger side crankcase intake tube and back into the intake. Or out through the weakest point of the motor.
The reason I'm getting so wrapped up in this is looking at a turbo install the MAFS is after the intercooler. So under low load conditions when vacuum is available oil vapors could be sent into the MAF body.
It the pcv line is installed betweem the air filter and the turbo oil vapor will collect inside the tubo and into the piping.
I need to have a clear picture of how this is all hooked up so that the car will pass emissions inspection. In Missouri we have a mechanical inspection and an emissions inspection. (plug into the PCM)
Thanks again.
01-20-2008, 10:45 AM
#7
3rd Gear Member
Thread Starter
Join Date: Feb 2006
Location: Fenton, MO.
Posts: 645
RE: A Question for those running Turbos
ORIGINAL: redxls
my pcv is between the air filter and the turbo. I got no oil build up after 5k miles.
my pcv is between the air filter and the turbo. I got no oil build up after 5k miles.
I was also thinking of this location and was considering installing a Stefs air/oil seperator between the pcv and the point where the line plugs in between the air filter and the turbo.
My car is a daily drive and has only seen the track once. Had to test it.
But for guys that take their cars to the track on a regular basis it would seem to me that at WOT excessive pressure could build up in the crankcase and must be relieved somehow.
Thanks again
01-20-2008, 11:08 AM
#8
5th Gear Member
Join Date: Dec 2006
Location: Redding, CA
Posts: 4,552
RE: A Question for those running Turbos
ORIGINAL: moosestang
Wouldn't that cause you to blow seals if you are running a lot of boost? I read someone was having problems with their oil seals leaking over 15psi (supercharger). The pcv system couldn't evacuate the blow by fast enough so pressure would build in the block. The solution was to delete the pcv system all together.
ORIGINAL: Simon1
I can't speak for the brake booster portion but I can comment on the PCV valve.
My kit (STS) has two phases: An inline filter and a shut off swich that closes the line under boost. Since the air intake is pressurized where the PCV comes in, it would cause boost to enter the top of the cam cover and then go the wrong way through the engine.It shutscloses the line @1 psi and turns back on when under vaccuum.
I can't speak for the brake booster portion but I can comment on the PCV valve.
My kit (STS) has two phases: An inline filter and a shut off swich that closes the line under boost. Since the air intake is pressurized where the PCV comes in, it would cause boost to enter the top of the cam cover and then go the wrong way through the engine.It shutscloses the line @1 psi and turns back on when under vaccuum.
I don't know enough about thePCV system to really answer this with any sophistication.
01-20-2008, 11:15 AM
#9
5th Gear Member
Join Date: Dec 2006
Location: Redding, CA
Posts: 4,552
RE: A Question for those running Turbos
ORIGINAL: GT John
Thanks for the input.
Now, your setup seems logical until we get to the part where as boost and HP ramp up. How is pressure relieved from the crankcase at WOT. Its gotta go somewhere.
S/C dont have this problem because vacuum is available at the S/C intake after the throttle body. But when they do go to WOT excessive pressure can build up in the crankcase, possibly forcing the pcv to open or for the pressure to escape through the passenger side crankcase intake tube and back into the intake. Or out through the weakest point of the motor.
The reason I'm getting so wrapped up in this is looking at a turbo install the MAFS is after the intercooler. So under low load conditions when vacuum is available oil vapors could be sent into the MAF body.
It the pcv line is installed betweem the air filter and the turbo oil vapor will collect inside the tubo and into the piping.
I need to have a clear picture of how this is all hooked up so that the car will pass emissions inspection. In Missouri we have a mechanical inspection and an emissions inspection. (plug into the PCM)
Thanks again.
ORIGINAL: Simon1
I can't speak for the brake booster portion but I can comment on the PCV valve.
My kit (STS) has two phases: An inline filter and a shut off swich that closes the line under boost. Since the air intake is pressurized where the PCV comes in, it would cause boost to enter the top of the cam cover and then go the wrong way through the engine.It shutscloses the line @1 psi and turns back on when under vaccuum.
I haven't really paid attention to the brake booster portion but I can see a "T" fitting put in there that runs to the boost controler.
I didn't know what the hell the entire contraption was until I read the instruction manual and it made sense.
I can't speak for the brake booster portion but I can comment on the PCV valve.
My kit (STS) has two phases: An inline filter and a shut off swich that closes the line under boost. Since the air intake is pressurized where the PCV comes in, it would cause boost to enter the top of the cam cover and then go the wrong way through the engine.It shutscloses the line @1 psi and turns back on when under vaccuum.
I haven't really paid attention to the brake booster portion but I can see a "T" fitting put in there that runs to the boost controler.
I didn't know what the hell the entire contraption was until I read the instruction manual and it made sense.
Thanks for the input.
Now, your setup seems logical until we get to the part where as boost and HP ramp up. How is pressure relieved from the crankcase at WOT. Its gotta go somewhere.
S/C dont have this problem because vacuum is available at the S/C intake after the throttle body. But when they do go to WOT excessive pressure can build up in the crankcase, possibly forcing the pcv to open or for the pressure to escape through the passenger side crankcase intake tube and back into the intake. Or out through the weakest point of the motor.
The reason I'm getting so wrapped up in this is looking at a turbo install the MAFS is after the intercooler. So under low load conditions when vacuum is available oil vapors could be sent into the MAF body.
It the pcv line is installed betweem the air filter and the turbo oil vapor will collect inside the tubo and into the piping.
I need to have a clear picture of how this is all hooked up so that the car will pass emissions inspection. In Missouri we have a mechanical inspection and an emissions inspection. (plug into the PCM)
Thanks again.
This is hurting my head now. All I know is I can drive my car as hard as I want and nothing bad happens except me spending more $$ on fuel. And tires eventually
