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Old 07-04-2012, 09:42 PM   #1
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ISL 400 normal boost value

Haven't really found the answer I'm looking for, What should the boost be on a 2006 ISL 400? On a good day I'll get 30-32 psi. What makes me wonder is occasionally I'll be alongside something where I can some sound reflection and I hear what sounds more like a whooshing air rush leaking sound rather than a normal turbo whine. Similarly when using the exhaust brake. Obviously louder and more pronounced as the boost goes up.


I have a Source Engineering Rad fan so it's probably quieter to hear other things now.



I have several other turbo vehicles, gas and diesel, so I know what turbo whine sounds like.



Do I need to look for a leak?
Thanks
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Old 07-04-2012, 10:44 PM   #2
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J Have the ISL400 in a 2007 Scepter. When the boost guage was reading 25 lbs and I heard the whistling sound, it was due for service so into dealer. Turbo was blown and took out charged air cooler. Cummins replaced under warranty. Boost then read 50 at max. A year later boost was reading 25 ibs. Cummins replaced blown turbo agaain under warranty.
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Old 07-05-2012, 12:38 AM   #3
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On my ISL, it maxes out on my gauge and on my VMSpc at 31-32.
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Old 07-05-2012, 12:43 AM   #4
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Seems like the ISL uses a higher pressure than our ISC. Stock it maxed out at about 25 psi, now with the Banks kit is about 35 and I did see is somewhat higher last time out on the Banks gauge. My VMSpc still won't show over 25 even though I reset the parameters.
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Old 07-06-2012, 12:17 PM   #5
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Thanks to all for input

Curious I called and got a call back from my local cummins tech line, he said at governed speed should be 65 inHg so that's like 32 psi. Max Hp 68 inHg, 33 psi, max torque 63inHg, 31psi

So good there, so does that mean the air whooshing sound is normal both in power and braking? Much louder and different than turbo spin sound.
Air inlet noise? New air cleaner less than 1,000 miles but did before.

Or just stay away from embankments and close window? lol
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Old 07-07-2012, 07:33 AM   #6
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We had a turbo Bi-pass hose go bad slowly, at first there was just a slight sound of air like you stated, then we lost all boost. The Cummins service repaired it in a very short time under warranty. It,s a !" 90 elbow hose by the turbo.
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Old 07-07-2012, 08:24 AM   #7
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That whooshing sound is most likely your EGR system. Although I have a different engine I have a warning from Detroit about it. At idle if I stand on the curb side next to the motor it sounds more like a whooshing from a jet engine. To get a diesel sound I have to stand on the drivers side.
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Old 07-11-2012, 05:24 PM   #8
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Thanks I'll give them a look.
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Old 08-01-2012, 07:29 PM   #9
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Just getting around to posting back to this thead. Our's is the 04 ISL370, and last trip out I set my Silverleaf to display boost levels. Under multiple conditions of what I expected to be max boost levels, I saw 21-22 readings. I do not recall ever seeing 23 or above. Engines seems to run well, nd no Silverleaf error codes are recorded. So my question is does anyone know if earlier ISL's had lower boost settings for the VGT?

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Old 08-02-2012, 01:15 PM   #10
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If its worth anything....

from what i've read, the 35 psi i see on my isc is normal.
and the twenty something you see on your isl is normal; 2.
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Old 08-02-2012, 07:12 PM   #11
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The turbo in my early '08 coach with a late '06 ISL non DPF runs in the high 30's. I've seen it at 39+, but never 40, as viewed on my Aladdin.

Question: For those with Aladdin or Aladdin Jr., how often does the boost value update on the screen. Most of the time mine is in around 5 seconds, with very rare occasions of 1 second updates. Is the ECM only sending occasional updates, as I believe the Aladdin is just reporting what is coming down the J1939 backbone?

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Old 08-02-2012, 10:29 PM   #12
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On my '06 ISL 400 I've never seen over 28 on the Alladin Jr. And by the way the guage and the Alladin Jr are pretty close, as best one can read the guage that is.
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Old 09-17-2012, 07:03 AM   #13
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Ive never figured out what the "PCT LOAD" is supposed to mean, exactly. Ive never seen mine read above 50% that I can recall.

Ive been keeping a close eye on my boost because I have a CAC leak. On last trip, with leak, I saw a max boost of 37 PSI or so, per the alladin jr. So my leak is not that bad. I start the remove and repair this week.
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