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07-20-2013, 04:57 PM
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#1
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Senior Member
Join Date: Apr 2013
Location: Missouri
Posts: 168
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Boost gauge hookup on 3126
Where's the easiest place to tap into the intake manifold on my engine for a boost gauge? Not seeing any open ports. Thinking of welding a bung into the boost tube right at the engine.
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2000 Newmar Dutch Star 3858 Freightliner chassis 300hp CAT engine
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07-20-2013, 05:14 PM
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#2
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,500
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Second attempt at importing a picture of the intake on my 3126B.
I believe the two Allen head plugs go into the intake , does yours look the same ?
Sorry I couldn't get a pointer to stick to the picture.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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07-20-2013, 05:39 PM
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#3
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Senior Member
Join Date: Apr 2013
Location: Missouri
Posts: 168
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Yes I have those two Allen head plugs. Wasn't sure the thread is something I can adapt to 1/8" npt.
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2000 Newmar Dutch Star 3858 Freightliner chassis 300hp CAT engine
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07-21-2013, 08:58 AM
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#4
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,500
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If you can't match the threads, you could , drill through the Allen recess, weld a nut on the top, and adapt to the nut.
Easier to weld to the steel plug on the bench than to the aluminum charge air tube.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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07-21-2013, 08:19 PM
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#5
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Senior Member
Join Date: Apr 2013
Location: Missouri
Posts: 168
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Its a -8AN o-ring port fitting. I think you read my mind. Here's what I ended up with.....
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2000 Newmar Dutch Star 3858 Freightliner chassis 300hp CAT engine
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07-21-2013, 10:50 PM
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#6
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,500
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I think there is a line in a rock & roll song for every situation in life. 
For this I'll go with " Dr. Hook ", " It's not that I'm older , it's just that I've spent more time with my back to the wall."
P.S. Can I borrow your welder, I'll have it back tomorrow .. honest.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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07-22-2013, 09:54 AM
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#7
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Senior Member
Join Date: Apr 2013
Location: Missouri
Posts: 168
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I'm sure the local hydraulic store sells a fitting or fittings to get me to the same place but I already had these parts laying around and the welder was handy so this was easy and quick. You're welcome to borrow the welder anytime. 
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2000 Newmar Dutch Star 3858 Freightliner chassis 300hp CAT engine
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07-22-2013, 10:03 AM
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#8
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Registered User
Fleetwood Owners Club Freightliner Owners Club
Join Date: May 2011
Location: Silicon Valley, CA
Posts: 1,857
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Nice Job!
And you even painted it Cat Yellow!
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07-22-2013, 03:11 PM
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#9
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Senior Member
Join Date: Apr 2013
Location: Missouri
Posts: 168
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Here's the dash gauge.
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2000 Newmar Dutch Star 3858 Freightliner chassis 300hp CAT engine
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07-22-2013, 09:15 PM
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#10
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,500
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Quote:
Originally Posted by DragRacer68
You're welcome to borrow the welder anytime. |
Stick, wire feed or tig. ??? 
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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07-31-2013, 05:43 PM
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#11
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Senior Member
National RV Owners Club
Join Date: Feb 2012
Location: Spokane Valley, Wa
Posts: 1,987
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First make sure you clean the area where the plug is so no grim or dirt gets into
the intake, second it takes two fittings but make sure you do not use a 90 degree
as the intake is at a slant and they hit the head and proven install.
I took the plug out and at my house of hose store they sold me both fittings and
5 ft of hose for a total price including tax $7.35
__________________
Art
1999 Trade Winds 7371 Cat 3126B w/current upgrades
1990 D 250 Dodge Ram Cummins Turbo
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08-05-2013, 03:05 PM
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#12
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Senior Member
Join Date: Apr 2013
Location: Missouri
Posts: 168
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Well, I see max. boost is 25psi. Gonna see soon what it makes when I reroute the wastegate to this fitting at the intake manifold. Hopefully it'll make 28psi, that would be a decent HP increase probably.
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2000 Newmar Dutch Star 3858 Freightliner chassis 300hp CAT engine
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08-05-2013, 04:17 PM
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#13
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Senior Member
Foretravel Owners Club
Join Date: Apr 2010
Posts: 511
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You want BIG Boost Plug the air line between turbo ad intake o no pressure is applied to the waste gate, eaning do not bypass at all. Of course do that at your own risk as it will way better and most likely develop problems, but it will be fun for a while. THINK 1st
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Foretravel, 2001, 36' ISM500 "Hot Rod"
F150 w/EZ Golf Cart or
CanAM 800 Max Limited ATV
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08-07-2013, 09:00 AM
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#14
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Senior Member
National RV Owners Club
Join Date: Feb 2012
Location: Spokane Valley, Wa
Posts: 1,987
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Quote:
Originally Posted by DragRacer68
Well, I see max. boost is 25psi. Gonna see soon what it makes when I reroute the wastegate to this fitting at the intake manifold. Hopefully it'll make 28psi, that would be a decent HP increase probably.
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On paper that will give you 37.5 hp,
When you say 25psi where is that pressure taken?
__________________
Art
1999 Trade Winds 7371 Cat 3126B w/current upgrades
1990 D 250 Dodge Ram Cummins Turbo
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