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Old 02-13-2001, 07:05 AM   #1
Scooby Specialist
Member#: 2389
Join Date: Sep 2000
Location: Las Vegas, NV
'98 Impreza L Wagon
'90 Talon TSi AWD

Post Silly turbo question for ya...

OK, I've seen turbo cars that have a cold-air intake. How does that work? When the turbo isn't spooled up, is there some additional piping that acts as a normal intake? And when you add a cold-air intake, does that feed the engine only when the turbo isn't spooled up, or does the cold air go into the turbo as well as just the non-boost intake? This is if I'm correct in assuming two different intakes, one for off-boost and one with boost. If I'm wrong, please enlighten me.
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Old 02-13-2001, 07:17 AM   #2
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Member#: 3139
Join Date: Dec 2000
Chapter/Region: RMIC
Location: SLC Utah
2001 Dodge Pikumup
& 08 Triumph Speed Triple


No there is only 1 intake. The colder the air the denser, weather you have turbo or not.

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Old 02-13-2001, 07:19 AM   #3
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Chapter/Region: TXIC
Location: S/E TX USA

your not gonna have 2 different intakes. here is how the setup goes..

you have your turbo. its connected to the exhaust manifold. there is a pipe going from the turbo around to a intercooler, and back into the intake manifold. your intake connects somewhere inbetween where the intercooler and intake manifold is. (please correct me if im wrong guys. this is what i remember from my readings)
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Old 02-13-2001, 07:44 AM   #4
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Location: rochester, ny

here's a ince little diagram for ya Rafal
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Old 02-13-2001, 07:48 AM   #5
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Join Date: Jul 2000
Location: Salt Lake City, UT
2000 Impreza 2.5RS
Blue Ridge Pearl


actually... the intake is connected to the turbo. Two sides to the turbo, the turbine and the compressor. The turbine side is connected to the exhaust. On one side is the exhaust manifold where hot exhaust gases come in, and spin the turbine and exit the other side to the cat/exhaustpipe and out of the car. The compressor side is connected to the turbine so that when it spins, the compressor compresses fresh air from the intake side, pushes it thru the other side to the intercooler and into the engine
...basically... usually the exhaust isn't fast enough on its own so the turbo decreases the radius of travel into the center of the turbine to speed it up... and then there are things like MAF/MAP's, BOV's, wastegates, and other bits, but the total basic route of air is intake to turbo to I/C to throttle body to cylendar where it is burned to exhaust manifold to turbo and out of the car
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