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06-03-2016, 02:52 PM
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#1
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Junior Member
Join Date: May 2010
Location: Las Cruces, N.M.
Posts: 10
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Hp & torque
Looking to up my torque on my 340 Cummins isb 6.7. Has any one had success in this case
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06-03-2016, 03:40 PM
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#2
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"Formerly Diplomat Don"
Newmar Owners Club
Join Date: Apr 2005
Location: Moorpark, Ca.
Posts: 23,922
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What transmission do you have? If you don't have the Allison 3000, there is not much you can do.
__________________
Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
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06-03-2016, 03:47 PM
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#3
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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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OP has a Tiffin RED 36'. Do they use a 2500 for a DP?
__________________
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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06-03-2016, 03:57 PM
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#4
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Junior Member
Join Date: May 2010
Location: Las Cruces, N.M.
Posts: 10
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I have a 2000 Allison
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06-03-2016, 04:09 PM
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#5
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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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The 1000, 2100 and 2500 are rated for a max of 300 hp and 780 Ft lbs. according to the Allison site.
__________________
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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06-03-2016, 07:10 PM
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#6
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Senior Member
Fleetwood Owners Club
Join Date: Aug 2011
Location: Tualatin Oregon
Posts: 164
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We just had our 340 Cummins isb 6.7 at Freightliner for some warranty work.
I asked them to check it for an upgrade to 360HP, it was 500 for the download and a couple hours labor.
I am happy it is factory so no warranty issues. it does have the Allison 6 speed.
__________________
2019 Discovery LXE 40M Koni Gold, Saf-T-Steer
RoadMaster sway bars F&R MCU's, Ping Tank
2015 Jeep JKUR Hard Rock M&G air brake System
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06-03-2016, 11:11 PM
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#7
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Senior Member
Join Date: Nov 2011
Posts: 884
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You would be better off upping the horsepower instead of the torque. You do that by spinning the engine faster. Reset the max governed speed up a couple hundred RPM and you've got more HP without changing the torque.
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06-03-2016, 11:13 PM
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#8
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Senior Member
Join Date: Mar 2012
Location: NW OREGON
Posts: 537
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Mr. D,
I question your rating on the 2500. The website still shows 700# max torque and 340 hp for motorhome duty. I spoke with a Tiffin Red owner several months ago who had increased the ratings on his 340 ISB to 350/800. His 2500 transmission was now surging (his description) on him. When I explained the 2500 limitations as had been advised to me by Allison he then decided he should reverse his decision.
__________________
Ron in NW Oregon
2017 Ventana 3436
2021 Chevrolet Spark LT
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06-04-2016, 05:37 AM
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#9
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Senior Member
Workhorse Chassis Owner
Join Date: Sep 2007
Location: st.charles mo.
Posts: 1,482
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Torque gets you going & HP keeps you going.
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06-04-2016, 11:33 AM
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#10
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Junior Member
Join Date: May 2010
Location: Las Cruces, N.M.
Posts: 10
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Can you tell me what freightliner dealer did your up grade? Thanks
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06-04-2016, 11:35 PM
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#11
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Senior Member
Fleetwood Owners Club
Join Date: Aug 2011
Location: Tualatin Oregon
Posts: 164
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McCoy Freightliner Oasis in Salem Oregon, 503-463-6303.
__________________
2019 Discovery LXE 40M Koni Gold, Saf-T-Steer
RoadMaster sway bars F&R MCU's, Ping Tank
2015 Jeep JKUR Hard Rock M&G air brake System
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06-05-2016, 12:25 AM
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#12
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Senior Member
Join Date: Mar 2012
Location: NW OREGON
Posts: 537
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TwoGypsies,
If you have the 3000 series Allison you will have no issue doing an upgrade. If you have the 2500 series you will void your Allison warranty. I would suggest checking with Allison (in Ridgefield WA just off I5) prior to making any changes. Just my $ .02.
__________________
Ron in NW Oregon
2017 Ventana 3436
2021 Chevrolet Spark LT
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06-05-2016, 08:56 AM
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#13
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Senior Member
Join Date: Aug 2012
Location: fulltiming
Posts: 295
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Quote:
Originally Posted by TWO GYPSIES
Can you tell me what freightliner dealer did your up grade? Thanks
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Check warranties before have any upgrade done. Freightliner will charge you $$ for doing a software "upgrade" that will give you so little additional performance you will hardly feel it. But it's your money.
__________________
Bob & Joan Alexander, 2010 Tiffin Phaeton 36 QSH, 2013 Jeep Wrangler (toad)
Lobo & Juniper (woof, woof)
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06-05-2016, 09:43 AM
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#14
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Moderator Emeritus
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 27,563
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Quote:
Torque gets you going & HP keeps you going.
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Maybe, but you can't have one without the other. Horsepower = Torque x RPMS/5252, so if you have more torque at any given rpm, you also have more horsepower. Increasing the peak torque doesn't necessarily improve engine performance at all if that peak occurs at a different rpm than previously.
Torque changes with engine RPM and doesn't continuously increase as rpms go up. You get more horsepower if the torque stays roughly the same as rpms increase (see formula above). If the torque goes down as rpms increase (which is typical once the peak is reached), you may actually lose power. That's why torque and horsepower are normally shown as a graph that plots both vs rpm. Peak values are largely just advertising numbers, accurate but often not of great meaning in practical performance terms.
Not sure why I'm bothering to try to explain this. Half won't believe it and the other half won't care.
__________________
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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