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08-22-2018, 06:35 AM
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#1
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Senior Member
Monaco Owners Club Entegra Owners Club
Join Date: May 2017
Location: Mayer MN
Posts: 140
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ISC 350 Turbo Questions
I have a 2002 Monaco Windsor 40 coach with a 350 Cummins. We are in the mountains of Colorado near Pagosa Springs and I wondered if my turbo is working properly. On long climbs my turbo only boosts to about 23 psi and my speed slows way down to maybe 30-35 mph. Is this normal or should it boost more and keep my speed up higher? I am also towing a Jeep Grand Cherokee weighing in at about 4500 lbs. thanks for any info/advice.
Brian
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Brian & Brenda
2008 Holiday Rambler Scepter 43' PDQ, 400ISL 8.9L
2013 Jeep Grand Cherokee Overland
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08-22-2018, 06:45 AM
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#2
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Senior Member
Monaco Owners Club
Join Date: Aug 2017
Location: Orlando, Florida
Posts: 5,819
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23 to 24 psi boost is about the max/normal range for that turbo.
EDIT: I should have asked - do you have the ISB or ISC 350?
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08-22-2018, 06:58 AM
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#3
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Senior Member
Monaco Owners Club
Join Date: Jan 2004
Location: Lafayette, LA
Posts: 248
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Brian,
Downshift manually ahead of the climb. I.E. do not let rpms fall below 1650-1700. You want rpm up in the 1900 range as you begin to climb.
Also never top a hill faster than your willing to go down it.
JDL
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2000 Monaco Windsor 40 PBSS
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08-22-2018, 07:06 AM
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#4
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Senior Member
Join Date: Feb 2018
Location: Indiana
Posts: 127
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Brian, JDL is accurate. Your turbo boost pressure will fluctuate with the rpm. When your RPM slow, the turbo boost will decrease. If your rpm are up higher and you do not see the maximum boost for your motor, then you could have an issue with the turbo or the lines leading to and from it.
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Hoosier14
Prevost, 45, DD Series 60
Country Coach Conversion
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08-22-2018, 07:35 AM
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#5
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Senior Member
Join Date: Jan 2016
Posts: 2,186
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Brian ,
Great answers so far .
You and I have a CAPs engine , our engines do not develop the higher
boost numbers that they see on the later common rail engines so you
are pretty near the top boost numbers .
When you can't develop enough boost the first thing is to change
fuel filters , they are the most common cause and the easiest thing to
try .
Sounds like you may be talking about Wolf Creek pass , that's a pretty
steep pass and you are pulling a lot of weight with not a real big engine .
Do as others advised down shift manually keeping the RPMs up .
To me more important than going up is going down , let your speed
get to high and all that weight can be nearly impossible to bring
under control .
Go down with the semis , they know how to do it .
Ray
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08-22-2018, 10:22 AM
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#6
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Senior Member
Join Date: Oct 2016
Posts: 1,804
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Hi Brian; In my opinion, your are where you should be with speed and boast numbers. I have an 01 34' PBS Windsor with the 350HP ISC and am towing a 2011 Jeep Wrangler Unlimited Rubicon weighing a little over 4,100# with all the junk I have in it. Here in Washington state we have some steep grades between western and eastern Washington. Same between western and eastern Oregon. With a little run at certain grades I get quite a ways up the hill in 4th gear until I reach about 40 MPH. On my Silver Leaf I am showing in the neighborhood of 23+ pounds of boast and when I get just below 40 MPH I downshift into 3rd and that puts me at 35 to 40 MPH the rest of the grade. So not too much difference in what you are seeing. Remember, you have the last year of the all steel framed Windsor's built. We are driving heavy coaches with only an 350 ISC in the tank. Have you looked at the UVW sticker on the closet wall in your coach? These coaches are heavy! My UVW is over 26K for a 34' coach. You have 6' more than I do. So to sum up your question, I don't think we are doing too bad. We still get there. Just not as fast as the ISM or the ISX equipped coaches. Hope this gives you some more perspective to your question and have a great day and enjoy your Windsor.
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08-22-2018, 07:03 PM
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#7
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Senior Member
Monaco Owners Club Entegra Owners Club
Join Date: May 2017
Location: Mayer MN
Posts: 140
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Thanks for the responses guys. Sounds like my rig is working fine. Its just a big heavy rig and yes Wolf Creek Pass in CO is the culprit! I will try downshifting before the next big climb we take. Thanks again everyone!
__________________
Brian & Brenda
2008 Holiday Rambler Scepter 43' PDQ, 400ISL 8.9L
2013 Jeep Grand Cherokee Overland
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08-22-2018, 08:21 PM
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#8
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Senior Member
Monaco Owners Club
Join Date: Jun 2014
Posts: 14,582
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I've got a 2002 Windsor with 350 ISC. I pull a Jeep GC
My boost does the same. I had to have my radiator replaced in 2015 and at the same time I had the CAC checked. It leaked like a sheave so it was rebuilt. I only gained ~1psi in boost and get 23-24 max. On long grades if I can keep my RPM's up I can maintain +45 but if for some reason, traffic etc, I loose speed I can't make it up.
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Jim J
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi
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08-23-2018, 02:46 PM
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#9
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Senior Member/RVM #90
Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 54,758
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That's about the same as my ISC350 under similar conditions.
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Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
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08-24-2018, 04:17 AM
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#10
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Senior Member
Monaco Owners Club
Join Date: Feb 2016
Posts: 1,051
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Funny story about Wolf Creek pass. We went there in 2009 towing a 9K 28 foot 5th wheel with my 2007 Duramax. We were only cruising up at about 45 miles an hour cause I had read all the horror stories. I seen other rigs big and small pulled over cause of overheating and such. I was not even paying attention to mine and I looked up at my over head monitor only to see it flashing like a beacon and the temp showed 220!. I panicked and dropped down one gear. Hearing the coolant fan sound like a airplane propeller sounded really good. The temp immediately dropped back to 205 within what seemed like seconds. I learned my lesson that day.....PAY ATTENTION....lol.
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