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Turbo boost pressure
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John..neAR
Posted 6/5/2010 19:51 (#1225722)
Subject: Turbo boost pressure



Caraway, AR

I got my 8940 tuned up to spec today and I was wondering what the max boost pressure should be....before waste gate opens.

Thanks,

John

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cowhater
Posted 6/5/2010 20:03 (#1225730 - in reply to #1225722)
Subject: RE: Turbo boost pressure


DE		about 26 psi
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John..neAR
Posted 6/5/2010 21:58 (#1225891 - in reply to #1225730)
Subject: RE: Turbo boost pressure



Caraway, AR

What about 33 @2150

John

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cowhater
Posted 6/5/2010 22:03 (#1225904 - in reply to #1225891)
Subject: RE: Turbo boost pressure


DE		I had to replace actuator on 8940 turbo and dealer told me that actuator rod should move something like .0015-.0040" when 26.4 lbs of pressure is applied to it.

Edited by cowhater 6/5/2010 22:03
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John..neAR
Posted 6/5/2010 22:11 (#1225920 - in reply to #1225904)
Subject: RE: Turbo boost pressure



Caraway, AR

I'm wondering if I have to much fuel turned on it, or if the actuator is stuck.........but then, even if there was to much fuel turned on.....it should still waste part of the boost......ya think?

Thanks,

John

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cowhater
Posted 6/5/2010 22:43 (#1225972 - in reply to #1225920)
Subject: RE: Turbo boost pressure


DE		could have a ruptured diaphragm in actuator. Put a hand-vac on it to see if it holds a vacuum or pressure. This actuator actually works on positive pressure. Check the rubber hose going to it for cracks. There is also a plastic line going to injection pump, check it for cracks. Too much boost can lead to blown head gaskets. Is 33 too much? not a mechanic so I'm not sure. Best to put hand vac on line coming out of intake manifold that way you know hoses are ok.

Edited by cowhater 6/5/2010 23:15
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eddiedry
Posted 6/5/2010 23:05 (#1226010 - in reply to #1225972)
Subject: Re: Turbo boost pressure



Wheatley, Arkansas		33 SOUNDS EXTREMELY HIGH, ESP @ 2100 RPM. hOW HIGH DOES IT GO LUGGING TO 1800? IS BLACK SMOKE ROLLING OUT OF THE EXHAUST?
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John..neAR
Posted 6/5/2010 23:10 (#1226027 - in reply to #1226010)
Subject: Re: Turbo boost pressure



Caraway, AR

Lug it more than 2150 and boost goes down.(2150 is where it peaks)......no smoke, none while pulling, only at first throttle, which I would consider normal.

BTW, pulls like a haint.

John

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eddiedry
Posted 6/5/2010 23:06 (#1226017 - in reply to #1225891)
Subject: Re: Turbo boost pressure



Wheatley, Arkansas		wOW, IS THE egt BUMPING 1500 DEGREES? hAVE YOU EVER SEEN A MELTED PISTON?
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John..neAR
Posted 6/5/2010 23:16 (#1226036 - in reply to #1226017)
Subject: Re: Turbo boost pressure



Caraway, AR

The EGT gauge doesn't have numbers, only bars. Pulling pan.....doesn't stay in a load long enough for the gauge to respond...........about 1/2 in the "green", which tells me absolulty nothing....actually runs very clean, as usual.

John

 

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kinzepower
Posted 6/6/2010 11:53 (#1226464 - in reply to #1225722)
Subject: Re: Turbo boost pressure


SW Ontario		If you are peaking at 33, but not holding it long I would not be conserned.
Now if you had a big field cultivator on it and held it there all day...you would have big problems I suspect.
It's all about duty cycle.
Have you dyno'd it?
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John..neAR
Posted 6/6/2010 13:18 (#1226565 - in reply to #1226464)
Subject: Re: Turbo boost pressure



Caraway, AR

Loading 12 c 12 reynolds dirt pan.....takes about 5 sec to load, boost goes back to 20 while in transit...1-2 min.

then load again.

You're right, I wouldn't want a ripper on it .....not for a min.

Probably will turn it back some anyway.

Thanks,

John

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