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Old 05-24-2011, 09:26 AM   #1
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What is max turbo boost supposed to be..& min. oil pressure at idle, ISC 350 Cummins

Made a test run today with the Silverleaf VMSpc hooked up. It works great.

Can some tell me what max turbo boost usually is, on a 2001 Cummins ISC 350 hp..?

...and what a warm Cummins engine usually has for min oil pressure at about 650 rpm.
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Old 05-24-2011, 10:09 AM   #2
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Quote:
Originally Posted by StansCustoms View Post
Made a test run today with the Silverleaf VMSpc hooked up. It works great.

Can some tell me what max turbo boost usually is, on a 2001 Cummins ISC 350 hp..?

...and what a warm Cummins engine usually has for min oil pressure at about 650 rpm.
Max boost indicated on the dash gauge has been ~23

Warm Oil pressure has indicated just under the first mark~25 to 30
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Old 05-24-2011, 12:05 PM   #3
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Max boost indicated on the dash gauge has been ~23

Warm Oil pressure has indicated just under the first mark~25 to 30
Thanks Jim...

I guess everything is 100% on my rig then.

My max turbo boost was 23.8 for a couple of seconds, but mostly 23.2/23.4 for a peak boost. ....and my oil pressure was about 28lbs..at 650 rpm.

Thanks again ..Stan
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Old 05-24-2011, 06:47 PM   #4
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Best $500-600 you never spent.
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Old 05-25-2011, 07:03 AM   #5
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Thanks Jim...

I guess everything is 100% on my rig then.

My max turbo boost was 23.8 for a couple of seconds, but mostly 23.2/23.4 for a peak boost. ....and my oil pressure was about 28lbs..at 650 rpm.

Thanks again ..Stan
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Old 05-25-2011, 07:29 AM   #6
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Best $500-600 you never spent.
You can say that again Mike..!

Many thanks to Dale777 for selling me his old VMSpc which he no longer needed. He had purchased a later model Alpine that already had Silverleaf on it.

Saved me a bundle...and his timing was perfect.

To those that don't don't know what we're talking about.. our Cummins dealer told me the only way to check the turbo boost was to put the Alpine on their dyno and it would cost $500/600 to run the diagnostics. ( I was concerned about a possible power loss issue) Dale 777 sold me a VMSpc to check it with on my laptop.
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Old 06-17-2011, 11:35 AM   #7
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Made a test run today with the Silverleaf VMSpc hooked up. It works great.

Can some tell me what max turbo boost usually is, on a 2001 Cummins ISC 350 hp..?

...and what a warm Cummins engine usually has for min oil pressure at about 650 rpm.
Here is the Cummins ISL 400 engine performance curves that I got from my Cummins Quick Serve On Line account.

Turbo boost is listed in inches Mercury (Hg). Two inches Hg = 0.982 PSI

The oil pressures for most Cummins automotive engines typically top out at about 45 - 50 PSI at rated load speed. Idle oil pressure for yours is about right.
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Old 11-30-2011, 11:46 PM   #8
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Boost should be in the 30's

Quote:
Originally Posted by StansCustoms View Post
Thanks Jim...

I guess everything is 100% on my rig then.

My max turbo boost was 23.8 for a couple of seconds, but mostly 23.2/23.4 for a peak boost. ....and my oil pressure was about 28lbs..at 650 rpm.

Thanks again ..Stan
I thought 19psi max was low on my 08 ISL 360. Called Cummins and was told should be twice that. Took it in and found there was a service bulletin for that. Seems the Hose from the turbo leaks. Had that replaced and then found 4 exhaust gaskets leaking. All done on warranty on my 08 Providence. Now I max out at 34. Now rather than 40 to 45 on the grades i get 65 in 6th gear!!!!! Should have checked this out a couple of years ago.
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Old 12-01-2011, 08:25 AM   #9
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I thought 19psi max was low on my 08 ISL 360. Called Cummins and was told should be twice that. Took it in and found there was a service bulletin for that. Seems the Hose from the turbo leaks. Had that replaced and then found 4 exhaust gaskets leaking. All done on warranty on my 08 Providence. Now I max out at 34. Now rather than 40 to 45 on the grades i get 65 in 6th gear!!!!! Should have checked this out a couple of years ago.

Wow thats a big improvement..bet you think you are driving a new coach! Congratulations..it nice when things come together with no hassels at the dealership....which is unusual around here. They all act like they saw a diesel engine for the first time when I have them look at mine..lol.

The difference in boost must be on the model and engine.

I just made a 2500 mile trip pulling a 20' enclosed trailer ...and mine scoots. Cruise control on, up hill and down..

I averaged 9 mpg on the back 1300 miles....running 60-65.
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Old 12-02-2011, 01:30 PM   #10
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Stan- not sure why, but yes the ISL has a significantly higher boost spec than the ISC for the model years where ISC's were common in Alpines. No idea where they boost current ISC's today.
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Old 12-02-2011, 02:06 PM   #11
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I thought 19psi max was low on my 08 ISL 360. Called Cummins and was told should be twice that. Took it in and found there was a service bulletin for that. Seems the Hose from the turbo leaks. Had that replaced and then found 4 exhaust gaskets leaking. All done on warranty on my 08 Providence. Now I max out at 34. Now rather than 40 to 45 on the grades i get 65 in 6th gear!!!!! Should have checked this out a couple of years ago.
I wrote wrong it is an ISC not an ISL
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