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07-04-2012, 08:42 PM
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#1
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Senior Member
Join Date: Mar 2011
Location: Headed to the next race track.
Posts: 187
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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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2006 Monaco 40' PDQ
25' Haulmark V-nose enclosed car trailer.
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07-04-2012, 09:44 PM
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#2
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Senior Member
Monaco Owners Club
Join Date: Apr 2008
Location: Northern California
Posts: 193
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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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JFC
HR Scepter
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07-04-2012, 11:38 PM
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#3
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"Formerly Diplomat Don"
Newmar Owners Club
Join Date: Apr 2005
Location: Moorpark, Ca.
Posts: 24,115
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On my ISL, it maxes out on my gauge and on my VMSpc at 31-32.
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Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
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07-04-2012, 11:43 PM
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#4
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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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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2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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07-06-2012, 11:17 AM
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#5
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Senior Member
Join Date: Mar 2011
Location: Headed to the next race track.
Posts: 187
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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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2006 Monaco 40' PDQ
25' Haulmark V-nose enclosed car trailer.
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07-07-2012, 06:33 AM
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#6
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Senior Member
Monaco Owners Club Holiday Rambler Owners Club
Join Date: Dec 2006
Posts: 1,723
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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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Mike & Sharon and our Pup Frankie
2008 HR Endeavor 40PDQ
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07-07-2012, 07:24 AM
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#7
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Senior Member
Join Date: Apr 2008
Location: Freeport, ME
Posts: 4,707
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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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Mike Canter
"Gunner" USN Retired, Airdale
2004 Monaco Signature 44' Conquest. Detroit 60
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07-11-2012, 04:24 PM
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#8
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Senior Member
Join Date: Mar 2011
Location: Headed to the next race track.
Posts: 187
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Thanks I'll give them a look.
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2006 Monaco 40' PDQ
25' Haulmark V-nose enclosed car trailer.
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08-01-2012, 06:29 PM
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#9
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Senior Member
Join Date: Aug 2010
Location: Over the next hill, around the next curve...
Posts: 5,663
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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?
Thanks,
Smitty
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07 Country Coach Magna Rembrandt 45' ISX600
Roo II was our 04 Country Coach Allure 40'
OnDRoad for The JRNY! Enjoy life...
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08-02-2012, 12:15 PM
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#10
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Registered User
Monaco Owners Club
Join Date: May 2009
Posts: 3,198
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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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08-02-2012, 06:12 PM
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#11
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Senior Member
Monaco Owners Club
Join Date: Sep 2007
Location: Scottsdale, AZ
Posts: 2,321
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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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Harry
2008 Monaco Camelot 40' PDQ
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08-02-2012, 09:29 PM
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#12
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Senior Member
Monaco Owners Club
Join Date: Jun 2003
Location: St. Cloud, FL
Posts: 1,528
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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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Bob 2006 Monaco Camelot 40PDQ
US Navy Carrier Battlegroup 1959/1965
Winters in Florida, Summers in Blue Ridge Mountains
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09-17-2012, 06:03 AM
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#13
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Senior Member
Join Date: Nov 2010
Location: Cornelius, NC
Posts: 177
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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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Loyd
2020 Dutch Star 4326, FL Chassis
2017 Nissan Frontier Toad
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