Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 05-04-2016, 03:00 AM   #1
Junior Member
Join Date: Apr 2016
Location: hillsdale,ontario canada
Posts: 18
looking for fuel mileage and more hp out of 330 hp cummins

what modification can be done to increase fuel mileage and hp.

grizzerly is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 05-04-2016, 05:13 AM   #2
Community Moderator
RV Wizard's Avatar

Country Coach Owners Club
Appalachian Campers
Gulf Streamers Club
Join Date: Mar 2000
Location: Chattanooga, Tn.
Posts: 11,815
I installed a Banks system installed with a larger turbo and cpu. I only wish I had done it earlier.

Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7
RV Wizard is offline   Reply With Quote
Old 05-04-2016, 05:48 AM   #3
Senior Member
Triker56's Avatar
Fleetwood Owners Club
Join Date: Jun 2009
Posts: 3,699
You can increase fuel mileage by driving 55-58 MPH.

Banks can increase HP & Torque but MPG increase will probably be 0.
Unless you slow down.

Been there done that with a ISB.
Banks gave increase power but MPG stayed the same.
99 Discovery 34Q ISB
2014 MKS AWD EcoBoost Toad
Fulltime Since "99"
Triker56 is offline   Reply With Quote
Old 05-04-2016, 06:56 AM   #4
Senior Member
Fiesta48's Avatar
Fleetwood Owners Club
Freightliner Owners Club
Join Date: Nov 2010
Location: Texas
Posts: 722
Travel light. Plan your trips via shortest, smoothest, safest way. No stuff on roof. Avoid hills, mountains and major cities. Accelerate semi-slowly. Use generator least amount possible. Hold your foot steady and off the floor.
I always get 1-3 more MPG than most.
Full Timers.
2015 Fleetwood Discovery 40E on a Freightliner XCS chassis with a Cummins ISL9 pulling 1 and/or 2 motorcycles, '07 Honda Accord OR a 17' Runabout Boat.
Fiesta48 is offline   Reply With Quote
Old 05-04-2016, 07:17 AM   #5
tcfamy's Avatar
Newmar Owners Club
Spartan Chassis
Join Date: Nov 2011
Location: Superior, WI
Posts: 43
I had the local Cummins service center reprogram my 2001 ISC from 330 to 350. the extra 100 ft-lb of torque over a slightly wider range made cruising the hills more comfortable. No mileage change until I converted the side fan hydraulics to multi speed. Average trip with Towd mpg went from 7.55 to 8.35 after that. Reprogram at Cummins $300, Multi speed fan conversion at Spartan $1140 in 2012.
tcfamy is offline   Reply With Quote
Old 05-04-2016, 07:50 AM   #6
Senior Member
dc8cappie's Avatar
Winnebago Owners Club
Join Date: Jul 2010
Location: Palm Harbor, FL
Posts: 278
Originally Posted by tcfamy View Post
I had the local Cummins service center reprogram my 2001 ISC from 330 to 350. the extra 100 ft-lb of torque over a slightly wider range made cruising the hills more comfortable. No mileage change until I converted the side fan hydraulics to multi speed. Average trip with Towd mpg went from 7.55 to 8.35 after that. Reprogram at Cummins $300, Multi speed fan conversion at Spartan $1140 in 2012.
So, after you drive 44,000 miles and have purchased 6,000 gallons you'll have broke even at current cost of fuel. Now you can start coming out ahead! I'm only averaging about 7,000 miles a year so it would take me about six years to break even.
05 Meridian, 39K, 350 CAT. '13 F-150 4X4, Blue Ox Aventa LX, Roadmaster 9160.
dc8cappie is offline   Reply With Quote
Old 05-04-2016, 08:04 AM   #7
Senior Member
jacwjames's Avatar
Monaco Owners Club
Join Date: Jun 2014
Posts: 3,610
I always thought/read that the variable speed hydraulic fan was more efficient.

Can you provide more information on your fan upgrade, did this go to an electric fan or did you still use the hydraulics?
Jim J
2002 Monaco Windsor 38 PKD
2005 Jeep Grand Cherokee w/5.7 Hemi
jacwjames is online now   Reply With Quote
Old 05-04-2016, 09:18 AM   #8
Senior Member
barmcd's Avatar
Monaco Owners Club
Texas Boomers Club
Join Date: Nov 2015
Posts: 1,490
There are lots of threads on this and other forums about increasing the HP out of the 330 HP 8.3 Cummins and the consensus seems to be that you can't do it by programming. I don't understand why that's so because the 8.3 seems to come in many different HP outputs, 300, 315, 325, 330, 350 and 365. I'm not sure what the reason is. I don't think they sell Banks kits for the 8.3 any longer.

on edit: I believe it's the late 1990s and early 2000 engines that can't be chipped.

Performance chip for cummins 330?

Cummins 330hp to ......

2000 isc 8.3 turbo upgrades
Dennis and Katherine
2000 Monaco Dynasty
barmcd is online now   Reply With Quote
Old 05-04-2016, 09:38 AM   #9
Senior Member
Skip426's Avatar

Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 11,963
grizzerly;Over the years Cummins has had a 330 hp , engine in both the 5.9 and 8.3 configuration . So adding the year and size of the engine will help you get the best info. The post with the cost of the modification vs the time to recover that cost is most interesting .

Note also that some years of Cummins engines equipped coaches, had a transmission that was marginal as far as being able to handle any more power.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
Skip426 is offline   Reply With Quote
Old 05-05-2016, 06:03 AM   #10
tcfamy's Avatar
Newmar Owners Club
Spartan Chassis
Join Date: Nov 2011
Location: Superior, WI
Posts: 43
We all do things that may not always make monetary or even practical sense. I am the first to admit there was no real reason to have Cummins reprogram the ECU for the extra 20hhp or 100ftlb other than I could. I am a bit of a power freak - (140hp Harley). Cummins did check with Allison before they would do the reprogramming to make sure there was acceptable capacity of the 3000MH transmission. I do like the modest difference when pulling up inclines. but I could have lived without it.

As for changing over the fan - it is a hydraulic powered side fan. Originally it was a single speed / constant relationship with engine rpm. Which meant sounding like an old style bus roaring through town at low speeds and kicking up dust storms in campgrounds. Spartan has a standard kit to convert this to two speed where the fan idles at a very reduced rpm until the coolant temperature hits 200F. Then it kicks in at regular speed until the coolant is below 200. I will guess that in traveling in the high dessert it will operate about 50% of the time. At a reasonable cruise in moderate temperatures maybe 5% of the time. I have heard that the fan can have a parasitic drag of 20hp to 45hp so I imagine that's where the mileage savings is derived. But most importantly for me the noise and dust storm is pretty much eliminated.

Overall comfort and personal satisfaction gain well worth the $$'s. for both mods. -- Tom
tcfamy is offline   Reply With Quote
Old 05-05-2016, 06:42 AM   #11
Happy Traveler : )
MisterT's Avatar

Join Date: Aug 2014
Location: Shooting Creek, NC... for now
Posts: 1,259
My 300hp gets 11.4mpg over the last 49k miles in 24months, weighing 25,750 loaded, pulling a 2,700lb toad. This is east coast to west coast, including all the mountains and flat lands, and eastern Canada Ontario to PrinceEdwardIsland, and from N Idaho to KeyWest.

My driving style probably helps -
'Mode' always, even in mountains -
Exhaust brake only when needed down mountains and in heavy local traffic -
60-62 mph average speed, which I find to be the sweet spot for this Cummins size and coach weight.

I wouldn't mind better fuel mileage, but I shore can't ask for much more, and low diesel prices certainly don't hurt my feelin's either. Keep on truckin.
The Turners 2014 Thor Palazzo DP 33.3 35' Bunkhouse
BlueOx, '14 Ford Fiesta, DishHD, KingTailgater2, WifiRanger
50k+miles, 200+ parks, 47 states&Canada provinces, since Aug'14
MisterT is offline   Reply With Quote
Old 05-05-2016, 07:25 AM   #12
Senior Member
ImagesByHawk's Avatar
Holiday Rambler Owners Club
Join Date: Nov 2013
Posts: 129
My stock 2004 ISC 330 gets between 8-10 mpg toting around a 38' HR towing a car/dolly combo.

Your engine is nothing more than a means to drive a huge hydraulic pump, the transmission. I notice a bit of improvement in the performance of my trans after having it serviced...fluid and filter change. Have you tried to use the Econ setting on the trans, this alters the shift points to increase performance/mileage if you know how to manage your throttle input.

Make sure your air filter is clean, your fuel is fresh and free of contaminants...change your fuel filters at the recommended period.
2004 HR Ambassador 38PDQ
ImagesByHawk is offline   Reply With Quote
Old 05-05-2016, 07:45 AM   #13
Tizbad's Avatar
Join Date: Apr 2012
Location: Il
Posts: 93
As we use to say in Engineering, keep the piston speed down.
Use Economy Mode, maintain adequate tire pressure.
Remember that you are trying to push a billboard down the road through the wind. Reduced speed, reduced acceleration, and taking advantage of coasting all help a lot. Only use the exhaust/engine brake when needed. 62-63 mph was the sweet spot on our 2005 38 PDQ Monaco with the ISC. I got as high as 11mpg multiple times.

2007 Tiffin Zephyr 45 QSZ
Tizbad is offline   Reply With Quote

cummins, fuel

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
I am looking to buy a Monaco Knight 38 PDQ with the Cummins 330 ISC eng. with the (8) rmartin Monaco Owner's Forum 2 02-27-2016 12:44 PM
Fuel mileage with 330 Cat meyr Freightliner Motorhome Chassis Forum 67 11-16-2015 10:10 AM
Looking for wiring diagram for 2003 Monaco Diplomat. Cummins 330 , Allison 3000 MH Norm Wood Class A Motorhome Discussions 2 11-11-2013 06:51 PM
Mileage On Cummins ISC 330 HartsRving Monaco Owner's Forum 15 03-01-2013 10:07 AM
330 ISC Mileage Keith K Monaco Owner's Forum 11 02-04-2007 12:07 AM

» Virginia Campgrounds

Reviews provided by

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 06:33 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.