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Old 05-04-2016, 04:00 AM   #1
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looking for fuel mileage and more hp out of 330 hp cummins

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

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Old 05-04-2016, 06:13 AM   #2
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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
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Old 05-04-2016, 06:48 AM   #3
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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"
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Old 05-04-2016, 07:56 AM   #4
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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.
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Old 05-04-2016, 08:17 AM   #5
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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.
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Old 05-04-2016, 08:50 AM   #6
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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.
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Old 05-04-2016, 09:04 AM   #7
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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
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Old 05-04-2016, 10:18 AM   #8
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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
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Old 05-04-2016, 10:38 AM   #9
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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
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Old 05-05-2016, 07:03 AM   #10
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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
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Old 05-05-2016, 07:42 AM   #11
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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'

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Old 05-05-2016, 08:25 AM   #12
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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.
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Old 05-05-2016, 08:45 AM   #13
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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.

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