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grrr16

Cummins 6bt 230hp

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Mike,

Welcome to the FMCA Forum.

Let's start by verifying that your transmission is capable of handling more HP. Do you have the MD3060 6 speed Allison-- it can handle more. If an Allison 4 speed, call Allison with your transmission serial number to verify that it can handle more HP.

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I wouldn't do much if anything to the engine. I went through all the stuff to get more power. Injector pump, injectors.etc. I got all the power I needed. The problem is the cooling system is not adequate to cool the engine and I ran out of gears because I had a Allison 545 4 speed. After spending a ton of money I pulled the engine and trans and replaced it with a 98 ISB 275. Changed the radiator. cac and trans cooler. Went with a MD3060 Allison which has 2 overdrive gears. I tow a Silverado and on a cross country trip last spring averaged a tick over 11 mpg.

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Guest BillAdams

I fixed my under-powered 1995 (1994 build) Cummins 230 by trading up to a larger coach! The engine was a dog even when powering a coach that only weighed 19,000 pounds.

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We have an Allegro Bus with 5.9 Cummins, 6 speed Allison everything great on flat land.. Currently we are having a Banks upgrade done.

Love our bus, just can't do the mountains very well. Tow a Chevy pickup usually with a RZR in the bed, total 3,000 lbs.

Will advise after this done and made some miles.

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Charles,

What Chevy PU do you have that, with a RZR in the bed only weighs 3,000 pounds???

Setting reasonable expectations for performance on grades is always a learning experience for those how are first time driver's of large/heavy vehicles. They ARE different that a car or SUV.

Caterpillar Corp has an excellent document that applies to ALL heavy vehicles, gas and diesel (let's face it, physics is physics).

You can view it here-- I think. If you have to register, it is free and done to keep out SPAM: http://www.catrvclub.org/forum/index.php/topic,6594.0.html

Then you can download the "Understanding Coach (RV) Performance".

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