5.9L 12V Performance Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with P7100 Injection Pumps Related to Performance and Longevity

Boost elbow?

Old Apr 26, 2012 | 12:14 PM
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Cordova2013-12 Valve's Avatar
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Question Boost elbow?

Okay, from what Ive read, a boost elbow allows more boost before the wastage opens. Correct me if I'm wrong, cuz I'm not completely sure myself, . My question is, about how much do they run, and how to, and if I should, install one..?
 
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Old Apr 26, 2012 | 01:38 PM
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yes install one. get a guage and ru it in the low 30's max boost for maximum life of the turbo and your head gasket. they function like this. instead of getting the whole 3/16 boost reference from the intake side they have a much smaller orifice in the elbo making it take longer to build up X psi on the other side of the orifice and delaying the opening of the gate. very noticable power gain going from 15psi to 30 for just $15 and 10 min to install
 
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Old Apr 26, 2012 | 02:02 PM
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Thanx bro, where exactly are they installed? On the other side of the engine from the turbo, on the wastegate line?
 
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Old Apr 26, 2012 | 02:09 PM
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on the wastegate line. doesnt matter where. you need manifold pressure line to the wastegate acuator. thats it
 
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Old Apr 26, 2012 | 03:29 PM
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Is there anything you can do, "homestyle" to achieve this? I'm not sure when I can get the elbow
 
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Old Apr 26, 2012 | 09:38 PM
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My boost elbow is a brass elbow that has a hole drilled and tapped on the top part of the elbow with a allen head screw in it which is the adjustment. I would personally just wait and buy one off ebay (mine was around $8).
 
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Old Apr 30, 2012 | 01:32 PM
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I have a small brass needle valve available at any hardware store for a couple bucks one side is barbed the other is npt thread and it threaded right on in place of the barbed fitting you can close the valve or open it to your liking. works great and cost about $2.50
 
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Old Apr 24, 2015 | 01:57 PM
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Hey guys. I just picked up a '94 12V and would like to do this boost elbow. I cannot find one for under $120-$135. Does anyone recall where they got theirs for $20-$30? Also I see a 3" and a 3.5" on ebay.... and reason to go with the larger or smaller diameter? Thanks!
 
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Old Apr 24, 2015 | 02:11 PM
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Rookie mistake... looks like the "intake elbow" and "boost elbow" are different. Boost elbow is a lil' brass 90 degree threaded insert. My bad. Still would like to know good places to get one? I will keep looking. thx
 
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