Brass Pill - Subaru WRX Forum
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post #1 of 3 Old 08-01-2005, 02:54 PM Thread Starter
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Brass Pill

Can someone explain exactly what the brass pill does, and why you would (or wouldn't) leave the stock one in, replace it with a larger aperture, or remove it entirely?

Someone told me removing it was a good thing, but it doesn't make sense.

I searched, and couldn't piece the whole answer together.

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post #2 of 3 Old 08-01-2005, 03:06 PM
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Removing it is a bad thing.

What it does is limit the amount of pressure that your boost control solenoid sees. Your solenoid opens at a certain amount of pressure. Without the pill, pressure builds too quickly and your wastegate opens too soon (about 7 psi usually). With the pill you can build more boost before the solenoid sees the target pressre.

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post #3 of 3 Old 08-02-2005, 07:26 AM
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what he said. And in the past some tuners used to use a smaller pill to hit higher boost levels, to help people not hitting target boost. If that line coming off the turbo was say, blocked, your WG would see no pressure, and you would over boost. So at the extremes, like cosmo said, no pill equals WG boost, and a blocked line would equal OVERboost. if you don't know, the brass pill is in the compressor line coming off the T in the turbo hose system.
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