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KENTELARSEN

Bully Dog for Cummins

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I'm not familiar with the Bully Dog, but I'd be skeptical of the big improvements noted. Also, if you have an Allison 3000 trans, 15% more HP would exceed the max for that trans.

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Kent, Welcome to the FMCA forum !

Have Cummings run a complete print out of your engine ECM before and after you add the Bully Dog.

There is a good chance the change will cost more then what you gain down the road.

Rich.

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Kent, you have expressed interest in add on chip or tuner to cummins 400 hp engine. Before you think about installing

anything thing, this add on is going to come with big price. Do your home work, direct from cummins or if it is cat do the

same.find out which sensors will be affected. I all ready know what cummins or cat is going to tell you and I also know

which sensors that will be affected. I would suggest on getting real good understanding with how the electronic engine

works. I can show without question,why cummins and cat will not respond in favor of chips or tuners. Now the people

that make these chips and tuners are going to relate a complete different story, just remember one thing replacement

cost for a cummins 400 h.p. Engine. $ 50,000 plus. Reason I'm not going deeper at present about damage that will occur

within the engine. Dave Atherton Retired Cat Mechanic

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Little confused, a 400 Cummins=$50K, but a 450 Cummins=$39K?! Lot of money. Also ref. 400 + 15% exceeds the Allison 3000 rating. A 450 runs with a 3000!

When I spoke with Cummins last year about increasing HP on my 425, they could do it, but recommended against it, because the gearing within my 3000 would have to be re calibrated for the extra HP and that would also change the computer settings for the engine and tranny.

The cost was not worth the extra 8-10% gain....I was actually looking for more torque, not HP.

Carl

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Carl good point the cost is not worth with what you will gain. if anything is done to increase power and take

it to cummins or cat and put the monkey on someone else. many people talk fuel milage and many talk more

power. remember the good old days when you drove a 230 hp cummins than powered up to a 250 and pulled

73,250 truck and trailer together. now we have a motorhome around 35,000# and now have a ISL 400 and want more

power driving most of the same roads.Being on a fixed income when is there enough power anymore.

Dave Atherton Retired Cat Mechanic

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Kent,

Another welcome to the Forum. When it comes to diesel motorhomes the following should be on your list:

1. Buy the floor plan you want.

2. Buy the horsepower you need for the motorhome weight plus the toad.

3. Mileage will be affected by many factors; weight of RV and toad, winds, speed, and road elevation. The only things you can control are weight and speed.

I too would stay away from any add-ons as Cummins and Cat have developed the spec's for torque and horsepower. If more of each is required buy a different coach.

Best of luck and safe travels.

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As an add on to what Kent said, you really don't have much choice when it comes to MH engines. You can either find the floor plan you like and take the engine it has, or find the engine you like and take the floor plan it has. This is not like car shopping where you have a choice of engines. Usually the manufacturer is going to put an adequate engine in the vehicle to do the job. We opt for floor plan over engine...so far it's worked out fine. We figure we'll spend more time living in it than driving it.

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I owned the bully dog and installed it on a 6.4 ford. Out of the package, the first thing is to attach it to your computer and download your specific engine data. It will tune both your engine and your transmission control. It has three different settings for power. It plugs into your computer site in your truck and will suction cup where you want it. For my 6.4 ford, it was awesome and added the power to travel to the Montana Mountains pulling a travel trailer. You do have to be careful though, it will add a lot of HP and Torque. It will spin the tires, big time. For service it is very easy to remove and re set to factory spec.

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I owned the bully dog and installed it on a 6.4 ford.

We may be comparing apples to oranges comparing a PU to a DP. With very rare exception, those on this forum with diesels have larger diesels installed in the rear (Diesel Pushers).

Adding HP adds heat and cooling on DP's is already marginal on those long grades. Also, many transmissions are at their HP/torque max without adding power.

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Now for the down side of above Bully Dog setup. first of all Ford Navstar diesel engine ( with top end Cat heui system and

cat sensors.) With electronic engine engine there are 5 sensors that report direct to the ECM and are controlled 5 volt sensors,

and a person cannot over drive voltage to these 5 sensors that are all 5 volt.to increase power, the boost pressure, intake

manifold pressure sensor, fuel pressure sensor and last the atmosphere pressure sensor. note that all these pressure sensors are

all wired together direct to the ECM. yes you can over drive a 5 volt pressure sensor for a while but need to understand , all

the above pressure sensors tied together only thing different is the signal wire from the ECM. when failure starts pressure sensors

stop. The cast block engine has a little harden steel insert sleeve that take just so much increased pressure. the engine head bolts will stretch. i have'nt talked about heating up but that is a given. lets go back and remove chip and return to stock to work on

engine. one thing all events are recorded on the ECM. where I have been seeing many failures and derate of diesel engines

because the above 5 volt pressure sensors are also derate sensors. Cummins has the same 5 volt sensors as above and also

will derate engine. we have many pickup pulling big fifth wheel trailers that been along the road and had no power and over

heating. most repair shops Ford, Dodge ,Durmax will not work on pickups that havew chipped. this is the same order for

Cat dealer and Cummins Dealers. most Deisel engines will go the long mile but when we as owners go away and not listen to

the people that build these engines and do not recommend add on chips and tunners, they very much know what there talking

about. If there was a dollar to be made with install of chip and tunners than Ford, Dodge,Durmax, big boys with Cat and Cummins.

It is spelled out as not worth the risk to a high dollar engine. Dave Atherton Retired Cat Mechanic

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Bill good post, going to fuel pressure sensor on fuel rail ( this sensor is a 5 volt sensor that I mentioned in above post ).

and No this group of sensors meaning 5 volt are not meant or designed to be over driven as this would happen

with bully dog being applyed.the values of the sensors are clearly spelled out on cummins Insite. as I mentioned the

makers of the chips and tuners will present all there plus facts to a certain group and cummins the engine maker will stand

with there views. In the end if a person goes out of the box and decides to over drive a electrical sensor with more voltage

to provide XYZ power than so be it. The same goes for running above rated rpm's and again yes you can. will damage happen

ahead with out of the box additions answer is yes. what is to be gained not following OEM spec's, another point of intrest

going with EPA on Diesel exhaust not meeting standards EPA certified the cummins 400 being on top of all the regulations

there is a pretty large fine involved in this area. If you read post on the Cat engines and problems meeting present exhaust

reg's there is no gray area. Ask Brett, Or Ken Carpenter in last part of July about Cat C-9 re-gen problems and Cat would

not bent on EPA rules. I think everyone has there points on the subject but having legal add on with exhaust a person is

subject to very large fines for tampering with a EPA certified engine. Dave Atherton Retired Cat Mechanic

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A lot off interesting info that I did not know! Thank you.

That being said, if your Bank account is deep enough and your **** bent on having both floor plan and HP...have a DP Custom made for you! The biggest engine I have seen is a 725 Volvo in a DP. MPG, I would guess is around 3 to 4. Just remember that even a Custom Coach, has it's limitations!

Back to normal. AMC will allow you a choice of engines on the Tradition, Eagle and Heritage, also a floor plan that you like from a different year. In other words, I have been in contact with them about building me a Tradition 45' Y, that's the floor plan I have now and a 600 Cummins. Have not been quoted a price yet from factory!

Carl

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