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426 boost pressure
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AC D21 View Drop Down
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Joined: 01 Feb 2015
Location: NJ
Points: 8 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AC D21 Quote  Post ReplyReply Direct Link To This Post Topic: 426 boost pressure
    Posted: 23 Jul 2018 at 1:06pm
How much boost can a stock D21 intake manifold take.
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 20546 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 24 Jul 2018 at 7:10am
More than 50, but not 100 psi.
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Joined: 28 Feb 2013
Location: MN.
Points: 7498 		Post Options Post Options   Thanks (0) Thanks(0)   Quote NEVER green Quote  Post ReplyReply Direct Link To This Post Posted: 24 Jul 2018 at 8:24am

A intercooled one would take more??
2-8050 1-7080 6080 D-19 modelE & A 7040   R50       
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Joined: 01 Feb 2015
Location: NJ
Points: 8 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AC D21 Quote  Post ReplyReply Direct Link To This Post Posted: 24 Jul 2018 at 9:57am
Thanks
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Joined: 12 Sep 2009
Points: 20546 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 24 Jul 2018 at 3:31pm
Intercooler will take 100 psi, yes.
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injpumpEd View Drop Down
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Joined: 13 Sep 2009
Location: Walnut IL
Points: 4917 		Post Options Post Options   Thanks (0) Thanks(0)   Quote injpumpEd Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jul 2018 at 8:11am
a customer of mine in MN with a D21 that I built a 450 roosa pump for was running 7th gear one time and it blew the stock intake apart. I sold him an intercooler manifold that was gutted. He was running an S300 turbo and they will exceed 50 psi. The load that 7th gear put on it must have sent it to over 60 psi lol! Luckily he had side shields on it. Since that time, I tend to shy away from the small manifold, and go to the intercooler manifold, even if you have to gut it. 
210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!
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Joined: 29 Nov 2010
Location: collinsville il
Points: 70 		Post Options Post Options   Thanks (0) Thanks(0)   Quote cms Quote  Post ReplyReply Direct Link To This Post Posted: 31 Jul 2018 at 10:37am
We blow a stock manifold apart at 45 psi with a s-400 3x3. Running ( different turbo set up)up to 70 psi now with intercooler gutted and ice box with no problem. 
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