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Old 11-03-2014, 08:52 PM   #1
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Turbo Boost What is the Maximum Boost that a 5.9, 275HP

what is the maximum boost supposed to be?????
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Old 11-03-2014, 11:21 PM   #2
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The engine in my 97 Discovery is a so-called 98.5, 24 valve, 5.9L, ISB.

Max I see on VMSpc is 23.2.
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Old 11-04-2014, 06:21 AM   #3
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Around 23 PSI for the OEM, at one time Banks had a kit that came with a bigger turbo that does 33-34 PSI. They no longer have or sell that kit.

I have one but the Ottominder box went out. And is no longer available. :(
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Old 11-04-2014, 07:36 AM   #4
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On my 02, 5.9, 275HP it is approximately 23 lbs when demand is heavy.
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Old 11-19-2014, 04:23 PM   #5
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thanks guys ,,i am 19" max ,,i will try to adjust it
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Old 11-19-2014, 09:45 PM   #6
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The boost on my 5.9 with the Banks system will touch 32-34 lbs. of boost from the 5-6 shift. If it is in the economy mode, 25-28.
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Old 11-19-2014, 09:52 PM   #7
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Quote:
Originally Posted by Triker56 View Post
Around 23 PSI for the OEM, at one time Banks had a kit that came with a bigger turbo that does 33-34 PSI. They no longer have or sell that kit.

I have one but the Ottominder box went out. And is no longer available. :(
I hope our Ottomind never gives out or we'll be in the same boat and I'll really miss the added power even with the bigger turbo left in place.
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Old 11-19-2014, 09:53 PM   #8
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The boost on my 5.9 with the Banks system will touch 32-34 lbs. of boost from the 5-6 shift. If it is in the economy mode, 25-28.
On our ISC with the Banks kit the boost always goes up to 34-35 PSI even when in economy mode.
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Old 11-20-2014, 10:08 PM   #9
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That's very interesting, Mr.D. I was very cognizant of the boost this year, because of the threads I have read on IRV2. I have the Banks, pyrometer, and boost gauge, plus the scan-gauge. The scan-gauge doesn't show the same amount of boost the Banks gauge does, it is lower, at any given time, by about 3-4 lbs. I to am worried about my Ottomind losing it's mind. I wonder if another type of horsepower chip will work?
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Old 11-30-2014, 07:43 PM   #10
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My '99 Cummins boost max is 19. All stock except Diablo sports Power Puck. EGT is 1200 at 19 psi boost, so what is your EGT at 23?
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Old 11-30-2014, 07:47 PM   #11
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Sounds right for a 98.5 Cummins, watch your exhaust manifold temperature, before the turbo, should not exceed 1300 F
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