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Old 06-26-2019, 07:58 AM   #1
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How much turbo psi on isb 275

Could any one tell me how much turbo boost pressure i should be getting on isb 5.9 275.
Itís giving me about 17psi at the moment
Is that the norm, if not how can I get a bit more.
Thanks
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Old 06-26-2019, 10:02 AM   #2
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you didnít mention if this is normal for your coach or sudden.

we have an 8.3 mechanical in our Ď95 and when boost suddenly dropped to 12-15 I asked / was told here to replace fuel filters.

problem solved, back to normal.
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Old 06-26-2019, 11:32 AM   #3
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Sorry I have just done a trip in Europe after replacing turbo and injector pump
Just wanted to no what is the norm,
Itís a 1998 diplomat
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Old 06-26-2019, 08:02 PM   #4
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If you Google how to get more out of a mechanical cummins you'll find results on a plate and adjustment procedures. More boost needs more fuel.Your going to want EGT sensor if you push it more.
I didn't see year or type of injector pump on your rig not sure if fuel plate star wheel adjustments work.
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Old 06-27-2019, 03:32 AM   #5
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Not sure it would be the same but I have an ISB 325 horsepower 5.9 Cummins in my 07 Neptune. According to my Banks readout mine will show up to 30 psi boost under stock form.

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