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12-09-2015, 05:56 PM
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#15
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Senior Member
Join Date: Mar 2013
Location: Boise, Idaho
Posts: 715
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Quote:
Originally Posted by rver98
ISC Cummins with 360 hp and 1050 lbs of torque. IF this is a lSB then it would be less torque.
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So you stand corrected  https://thormotorcoach.com/tuscany/xte/ . No
newer Thor Tuscanys come with a ISC.
I want to upgrade to more power but it appears my gasser tops most Diesels. 
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2016 Thor Tuscany 34ST XTE, Freightliner XCR, ISB 360hp/800tq. Allison 3000, Koni FSD shocks, Roadmaster 1.75" front sway bar, Safe-T-Plus, DYI air bag flow control valves.
2015 Jeep Willy's Wheeler Wrangler Unlimited Toad, Ready-Brute-Elite tow system.
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12-09-2015, 06:03 PM
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#16
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Member
Join Date: Jan 2015
Posts: 54
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Just offering a different viewpoint here - when did you last change your fuel and air filters?
BLK-9
2016 Force
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12-09-2015, 06:09 PM
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#17
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Senior Member
Tiffin Owners Club Freightliner Owners Club
Join Date: Dec 2010
Posts: 582
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Quote:
Originally Posted by IdahoSRT10
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That stinks!! Sounds like Thor screwed up! 
__________________
07 Monaco Dynasty Diamond IV 42 ScanGuage D, AG Performance Module, Koni FSD, Safe T Plus, Ready Brake Elite, Ford F150 4x4 EcoBoost 
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12-09-2015, 07:51 PM
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#18
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Senior Member
Join Date: May 2006
Location: Northern Arizona
Posts: 1,183
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The turbo boost reading is obtained by scrolling through the engine settings with the toggle knob for your center LCD display
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Harry
2015 Tuscany 40 KQ
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12-09-2015, 08:29 PM
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#19
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Senior Member
Tiffin Owners Club Freightliner Owners Club
Join Date: Aug 2014
Posts: 1,899
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If this is a Freightliner Chassis, then it probably has a LBU (Light Bar Unit).
Does it have three text display lines in the dash panel?
If so, you can change what is displayed, and one of the things that you can display is the Boost Pressure.
SORRY HarryB, missed your post
Regards,
Dan
__________________
2014 40QBH Phaeton DP Cummins 380HP ISL, Freightliner XC, 2019 Jeep Grand Cherokee Trailhawk TOAD
Blue Ox Aventa tow bar, SMI Air Force One -Cave Creek, AZ.
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12-09-2015, 09:05 PM
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#20
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,971
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That much turbo-lag + low power sounds like a leaking exhaust pre-turbo piping. At any rate, locate a Cummins coach-care dealer and have them run a diagnostic test.
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2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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01-13-2016, 04:27 PM
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#21
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Member
Winnebago Owners Club
Join Date: Sep 2011
Posts: 82
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I have a 2011 Cummins ISB 6.7 XT. Juse had a MP-8tuner installed. After almost 1000 miles down I-5, over the Siskyous I am able to pull all hills 10+ mph faster and am getting about 1mpg better. It has been fantastic. Set at 3/4 boost
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01-13-2016, 05:03 PM
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#22
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Senior Member
Join Date: Jan 2014
Posts: 4,669
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Based on this spec sheet http://.rvcountry.com/common/brochures/mak8777.pdf you have an ISB XT with 800 ft/lbs of torque. I have a 300 HP Cummins with I think 600 Ft/lbs in my Excursion which is slightly smaller and it gets along quite well. It's sweet spot is 1800 RPM.
What kind of "hills" are you referring to? Normal flatland hills, or 6% grades or greater? When I was doing 7% grades my coach was in 4th and 5th gear over 2000 RPM and doing 45-50 MPH. But normally it chugs along towing a 4000 pound car just fine at 65 MPH around 1800 RPM. It merges onto the highway just fine.
Sounds like you need to take it to a Cummins/Freightliner shop and take the mechanic for a test ride.
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2023 Winnebago Travato
2023 Airstream Flying Cloud BH 30'
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01-13-2016, 09:50 PM
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#23
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Senior Member
Country Coach Owners Club
Join Date: Dec 2010
Posts: 7,803
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On reading your first post, I thought to myself that you are a new diesel driver. My suspicions are correct.
You need to spend some time learning how to drive a diesel and no, you cannot drive it like a gasser or you will experience what you are now.
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Don
2002 Country Coach Intrigue
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01-13-2016, 10:05 PM
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#24
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Senior Member
Monaco Owners Club
Join Date: Feb 2011
Location: Signal Hill, California
Posts: 3,320
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RICPE I hope you have a "pyro" gauge and a boost gauge. A better value would be to have Cummins reflash your ECU for more torque and HP. Sanford PS we chipped our ISB 6.7 and the temps went way up.......haven't used it since.
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Sanford, Linda & R cats: Molly, Levi, Cody
2011 Monaco by Navistar RV
Good Sam Life Member Good Sam Hams Chapter
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01-13-2016, 10:05 PM
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#25
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Senior Member
Join Date: Jan 2011
Location: Pensacola, FL
Posts: 2,457
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Quote:
Originally Posted by dons2346
On reading your first post, I thought to myself that you are a new diesel driver. My suspicions are correct.
You need to spend some time learning how to drive a diesel and no, you cannot drive it like a gasser or you will experience what you are now.
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Probably this^^
It took me awhile to get used to the snail's pace acceleration of my MH. ISB 350/750 with Allison 3000. Considering that I am pulling 35,000 pounds including an SUV in tow, it actually does pretty well! Even an old aircooled beetle seems snappy in comparison.
__________________
2008 Itasca 37H
2011 & 2012 Len & Pat's "One lap of America"
27K miles & 41 states in 13 months
 Yellowstone Lake 6-1-2012
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01-13-2016, 10:17 PM
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#26
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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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Quote:
Originally Posted by deSanford
PS we chipped our ISB 6.7 and the temps went way up.......haven't used it since.
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That's why I went with a Banks kit on out ISC 350. Included a boost and EGT gauge plus it would automatically dial the fuel/boost or both back if the EGT's went too high.
__________________
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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01-14-2016, 12:23 PM
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#27
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Junior Member
Join Date: Aug 2013
Posts: 10
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Changed just recently when I changed the oil.
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01-14-2016, 12:29 PM
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#28
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Junior Member
Join Date: Aug 2013
Posts: 10
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Quote:
Originally Posted by Ray,IN
That much turbo-lag + low power sounds like a leaking exhaust pre-turbo piping. At any rate, locate a Cummins coach-care dealer and have them run a diagnostic test.
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Cummins ran a diagnostic. Freightliner did also. The only codes that came up were 'Throttle Position' codes from mile 00001. That is expected since the factory id/reassembles the throttle linkage a number of times while building the coach. Thanks..............Jim
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