Boost gauge, compression fitting question
Lead Driver
Joined: Jun 2007
Posts: 7,760
Likes: 27
From: Hampton, Maryland.
Yep, but not a lot of people know that. Most think that the movement of the exhaust gasses are the major driving force behind a turbo, and it's not.
Post Fiend
Joined: Feb 2007
Posts: 14,541
Likes: 2
From: Dallas-Ft. Worth
Technically both are correct. The expanded hot gasses leaving the cylinder after combustion *ARE* the movement of exhaust gasses, and a lot of heat! There's just more of it when you load these babies down. It's kind of like the discussion of what kills you, voltage or current? Well, you can't have enough current without enough voltage -- just like you can't have enough exhaust gasses without enough heat! Can't have one without the other. 
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Posting Guru
Joined: Jul 2007
Posts: 1,360
Likes: 0
From: Charles Town, WV
Took it for a spin this morning and the gauges works. I do have to 'get on it' for the needle to really climb and it tops out at 15lbs. Could that be a small leak in the boost gauge tube or more like a leak in the IC system? I thought I checked all the clamps when I first bought it.
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Posting Guru
Joined: Jul 2007
Posts: 1,360
Likes: 0
From: Charles Town, WV
Performance wise it feels the same as before so I bet it's the boots. That may also explain why when my dad and I raced he completely spanked me. Same intake and exhaust but he has a DP Tuner and I have the programmer.
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Post Fiend
Joined: Feb 2007
Posts: 14,541
Likes: 2
From: Dallas-Ft. Worth
Mine came in the tee that came with my gauge kit. I just unscrewed it from the tee, put a little teflon tape on it, and screwed it into the AIH plug. Here's a pic of the tee (ignore the HPX text):
Here's what it looks like screwed into the AIH delete plug with a new line between the manifold & my OBA:
Here's what it looks like screwed into the AIH delete plug with a new line between the manifold & my OBA:
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Posting Guru
Joined: Jul 2007
Posts: 1,360
Likes: 0
From: Charles Town, WV
I used the one that came with the gauge but Carquest has them. Since I drilled out a Dodge drain plug that had a pretty deep 3/8" square hole for a wrench, the 1/8" male wasn't long enough. I went to Carquest and bought a male/male 1/8" npt and then used a 1/8" female to ferrell fitting. Not before cutting off some length of the drain plug. I didn't see the point of installing a super long plug, that's the whole point of the AIH delete anyway, right? So I cut to equal the AIH threads.
Threads cut down.
Original length.
Threads cut down.
Original length.
Post Fiend
Joined: Jul 2005
Posts: 14,582
Likes: 12
From: 21791
Heat, velocity, and pressure all contribute to spooling a turbine, and you need all three at the same time. Break down the term "expansion"--the molecules moving back and forth rapidly (more so with more heat), in a given space, when they expand, they create PRESSURE, right? How can you have "expansion of gasses" without exhaust pressure? They kind of go hand-in-hand
Cargo Master
Joined: Apr 2009
Posts: 2,135
Likes: 0
From: Man Cave
I was only getting 15lbs on stock. 20 lbs on my Race mode chip. Made a boost leak detector and found out my I/C boots are leaking also the up pipes behind the turbo are leaking big time. So check both. I bet your up-pipes are black.
See the black soot coming from the flange. the other side is worse.
See the black soot coming from the flange. the other side is worse.
Junior User
Joined: Nov 2008
Posts: 57
Likes: 0
From: Virginia
When I "upgraded" my AIH-delete plug I noticed that the plastic tubing was slightly bent shut at the end. Using a razor blade I recut it for a straighter end. The gauge-end will be more difficult to access, but the intake-end is trying to blow the end shut. The gauge-end is "blowing it open" so shouldn't be as much a problem.
