I may have just had an epiphany....
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Joined: Jul 2002
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From: Washington DC
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I may have just had an epiphany....
Got to thinking about this, it makes some sense, but I'm not sure if its a big enough port.
A catch can done right (and emissions passable) requires you to disconnect the PCV line, put a baffled catch can w/o an atmospheric vent in and connect it to the intake PRE-turbo. All well and good.
Now.... the smart part.... when you do this, most things say to just cap off the hole in the IM.... but wait a sec, wouldn't that make the perfect vaccum source for all the other crap? I'm just thinking forget T-ing a line, just plug a vac source line into that send it to a vac manifold and go. Why wouldn't this work? Cuz it sounds to me like it should work perfectly.
A catch can done right (and emissions passable) requires you to disconnect the PCV line, put a baffled catch can w/o an atmospheric vent in and connect it to the intake PRE-turbo. All well and good.
Now.... the smart part.... when you do this, most things say to just cap off the hole in the IM.... but wait a sec, wouldn't that make the perfect vaccum source for all the other crap? I'm just thinking forget T-ing a line, just plug a vac source line into that send it to a vac manifold and go. Why wouldn't this work? Cuz it sounds to me like it should work perfectly.
Wanna see a donkey show?
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From: Sacramento California
Rep Power: 0 Do yo u mean the im or the intake pre turbo? If its the im it would be under pressure from boost. Two things I remember about pulling vacume is placement will give you different readings.......such as pulling vac for a vac adv distributer if pulled down low on a carb will be diff if pulled from a higher source which could give you incorrect advance at the wrong time. So if pulled say before turbo when the turbo boosts it may be too much vacume.
Thread Starter
Joined: Jul 2002
Posts: 13,151
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From: Washington DC
Rep Power: 424 Catch can routes PCV valve -----non-vented can----- pre turbo
It leaves a hole in the IM, which was the vac source for the PCV line which now has a new vac source (the turbo compressor). Instead of filling the hole in the IM, make use of it for feeding a vac. dist. block for the DV, Emanage sensor, etc....
It leaves a hole in the IM, which was the vac source for the PCV line which now has a new vac source (the turbo compressor). Instead of filling the hole in the IM, make use of it for feeding a vac. dist. block for the DV, Emanage sensor, etc....
Joined: Jun 2002
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From: so cal djmota=oscar
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Originally Posted by skipbarber
how big is that port on the IM?
That port should work fine as a vacum/boost source.
Thread Starter
Joined: Jul 2002
Posts: 13,151
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From: Washington DC
Rep Power: 424 I don't think its 1/2" thats friggin enormous.
I've heard 3/8" which sounds more realistic to me, and thats still a useable tap for a gauge, a MAP sensor and a BOV.
At 1/4" you're probably starting to run out of the ability to use it as a tap, but I really hope the PCV isn't that small.
I've heard 3/8" which sounds more realistic to me, and thats still a useable tap for a gauge, a MAP sensor and a BOV.
At 1/4" you're probably starting to run out of the ability to use it as a tap, but I really hope the PCV isn't that small.
Thread Starter
Joined: Jul 2002
Posts: 13,151
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From: Washington DC
Rep Power: 424 I got my head under the hood today, the PCV port appears to be on the order of 1/4". I don't think its big enough to support a whole bunch of stuff, BUT, it should be big enough to support 1 item, like a direct tap for a boost gauge. thats probably going to be the most accurate place to tap that anyways, but it looks like the brake booster or something still needs to be tapped.
