Subject	Boost pressure in air intake piping.
Posted by	Jacob94TT on March 14, 2005 at 8:58 AM
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Message	All: Seems like a lot of people are trying to debug boost leaks and high idles now (myself included). Now that I'm doing the work, I have some questions that I've wondered about, and maybe someone can explain. How can there be positive pressure (boost) in the air intake pipes (directly outside the TBs)? Wouldn't that positive pressure flow out backwards through the air filter? I have a tear in one of my air intake pipes and suspect it's my boost leak, but then I wonder how that slight leak even compares to a huge air intake pipe w/ filter on the end? Is there some sort of check valve that only allows intake air to flow in one direction? Or is it some trick w/ the plenum? Leading me back to the question: Do the air intake tubes actually see positive pressure? Thanks! -Jacob 94TT
Follow Ups	Boost pressure in air intake piping. - Jacob94TT 08:58:00 03/14/05 Wow. Think about this one for a bit... (n/m) - boileralum 09:16:26 03/14/05 Um, yeah, read this - ImTheDevil 09:19:50 03/14/05 If your throttle body is closed during boost... - fantomZ(OH) 09:34:07 03/14/05 The system is only pressurized after the turbo - Guapo 09:34:55 03/14/05 BOV's get rid of the major pressure after high boost - 300_zx_vg30det 09:54:51 03/14/05 stock recirc's do the trick too (n/m) - fantomZ(OH) 09:57:02 03/14/05 What the hell are you talking about? (n/m) - Marshall 10:02:07 03/14/05 cool, you have a single turbo vg. i have a carb'd vg. cool (n/m) - genic 10:17:08 03/14/05 Re: BOV's get rid of the major pressure after high boost - boileralum 10:17:28 03/14/05 hahahaha (n/m) - fantomZ(OH) 10:27:27 03/14/05 Hence the illustrious 'Green Orb' - SilverTwin(OH) 10:48:44 03/14/05 wow..just wow - HogZ (Allen, TX) 10:57:47 03/14/05 You're obviously trying to help, but you should take some - Scotts94z32 10:58:28 03/14/05 plesae off the poor guy some doses of howstuffworks.com (n/m) - Max865(ATL) 12:30:53 03/14/05 huh? (n/m) - Scotts94z32 16:20:41 03/14/05 Is that you Jerry? (n/m) - Kenny 12:58:44 03/14/05 LOL,,,,,,,, LOL,,,,,, I was going to say that,,,,,, crazy! (n/m) - fourZero 13:12:28 03/14/05 lol (n/m) - aliaZ 19:34:11 03/14/05 LOL (n/m) - Jason(MD) 15:26:58 03/14/05 Re: Boost pressure in air intake piping. - Marshall 10:07:48 03/14/05 That is a vacuum leak if it is after the MAF. - CarlCuro 10:27:38 03/14/05 CAUTION: Danger to Manifold! (n/m) - fourZero 13:09:49 03/14/05 ha ha ha (n/m) - dvlhntr 13:33:39 03/14/05
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