Originally posted by LakeMountLude what does this mean? i think i have an idea but i want to be sure.. i hear people talking about the fmax and drag kits running on both modes..
the wastegate controls boost pressure. When the set boost level is set the wastegate opens up and lets out exhaust gases. These gases can go out into the OPEN atmosphere, OR they can be rerouted back into exhaust system (closed loop).
OPen loop offers better flow, at the cost of noise and possible engine bay dirtying (the hole the opens is sometimes pointed right at the engine or car chassis, dirtying it up)
you can see this downpipe here. The smaller tube connects to the wastegate and brings the gases back into the exhaust when it opens up.
and of course open is more illegal than closed... depending on what state you're in any turbo might be illegal, but i don't believe anyone lets you vent exhaust gases straight into the atmosphere.
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Originally posted by LakeMountLude what does this mean? i think i have an idea but i want to be sure.. i hear people talking about the fmax and drag kits running on both modes..
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right, those of you with an a/f gauge can see this in action. when you're just cruising around, the a/f ratio will bounce back and forth from quite lean to slightly rich. it bounces too fast to really tell what's going on at times. when you give it just enough gas, it'll bounce to a certain spot and stay there (hopefully a not too lean spot!) it's actually kinda neat, but fairly useless given the accuracy of the 02 sensor and gauge.
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"AIDS is not just God's punishment for homosexuals; it is God's punishment for the society that tolerates homosexuals." R.I.P. Jerry Falwell.
Originally posted by hopen_luder Closed loop means OBD2 is controlling emitions and Open loop ...the car is out of emitions controls...
Just being a little picky, but OBD 2 has no specification on closed loop control. OBD only specifies how to monitor the Oxygen sensor and detect fault not how to use it to correct fuel. Closed loop auto correction using the O2 sensor is used on almost all ECU's including ones that are not OBD compliant.
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the wastegate controls boost pressure. When the set boost level is set the wastegate opens up and lets out exhaust gases. These gases can go out into the OPEN atmosphere, OR they can be rerouted back into exhaust system (closed loop).
OPen loop offers better flow, at the cost of noise and possible engine bay dirtying (the hole the opens is sometimes pointed right at the engine or car chassis, dirtying it up)
you can see this downpipe here. The smaller tube connects to the wastegate and brings the gases back into the exhaust when it opens up.
That's a sweet downpipe, I wish it was for our car
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Originally posted by TrboH22 I've got a vid with audio of me revvin my car to 4000 rpms. I run open loop. I'll post it tommorow so you can hear the sound.
id love to see that, can you post it?
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