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I bought a pre-silencer (no back pressure) and I have a question...

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Old 07-09-02, 03:09 PM
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Speedster

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I bought a pre-silencer (no back pressure) and I have a question...

Ok guys, I have an N/A and I uses the air pump to actuate my 6 port so I don't really need the back pressure from the cat to do this. So I went ahead and bought a pre-silencer for the turbo (the ones without a back pressure tube). My question now is, how do I block off the split air pipe that connects to the intake manifold?

Last edited by HENRX7; 07-09-02 at 03:16 PM.
Old 07-09-02, 03:30 PM
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It is an outlet, so unless the hissing noise bothers you, you can leave it open.
Old 07-09-02, 03:55 PM
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Yep, just leave it. I did it, and no problems (but I of course wired the ports open....which I won't do on my next Rex)
Old 07-09-02, 04:59 PM
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Speedster

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hmmmm.... just an outlet? i thought it is also an inlet because that's where the backpressure goes in. please correct me if im wrong.
Old 07-09-02, 05:11 PM
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HENRX7.....You're wrong. There. I did it.
Old 07-09-02, 06:07 PM
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ok, i'll just leave it open then
Old 07-10-02, 11:36 AM
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Originally posted by HAILERS
HENRX7.....You're wrong. There. I did it.
Yup. The backpressure on the '86-'88 comes from a small line (bout the size of a vacume line) that tees off the split air pipe. The large dia pipe has a check valve in it. Air goes in but not back out.
Old 07-10-02, 03:18 PM
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I got my pre-silencer installed this morning. Oh man, is it loud or what!!! I thought the pre-silencer was supposed to tone it down a little but it got louder. But on the other hand, I am satisfied with the performance gain. I get a better acceleration and the high pitch metal sound is now gone (i hate that ).

One thing I noticed was my exhaust is now spitting white smoke. I never had this before. Any idea guys?
Old 07-10-02, 03:34 PM
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Like a lot of white smoke? Does it do it after it warms up? More details please.
Old 07-10-02, 03:53 PM
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no not a lot but it smokes when it accelerates. At idle, its fine. Has it something to do with the newly installed pre-silencer?
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