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Old 05-17-2022, 03:30 PM   #1
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Engine Swap?

Anyone considering changing the Breeze ISV to the current ISB engine?
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Old 05-17-2022, 03:44 PM   #2
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Welcome to iRV2.

You don't say what year your Breeze is or what transmission ; BUT ; The current ISB with Common rail fuel system and a VGT ( Variable Geometry Turbo ) adapting the electronics controls would be a nightmare .
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Old 05-17-2022, 03:44 PM   #3
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I have talked about this on the Breeze Facebook group before. In a year or two I will probably delete all the emissions garbage from my engine. Wish I had the time now to do it, but I don’t. Once deleted, I will run it for a few years and see how it responds. I have also thought about doing an engine swap from the Maxforce to something else….we haven’t figured out the something else yet.

The Maxforce is a great engine and my only reason for an engine swap is more hp (speed up hill). I am constrained by wheelbase at my house. I think the breeze is the biggest I can get up the top of my driveway. Because of that I dont mind putting some money into the engine.
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Old 05-17-2022, 05:22 PM   #4
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In effect, that is what I did when I purchased a 2020 with the ISB. However, the difference between the flat torque curve on the ISV with 600 ft-lbs max and the 700 ft-lb peaked curve of the ISB is not as much of an improvement as most would expect from a 65hp increase.

The culprit is quite likely a combination of the torque limiting software in place to protect the Allison 2500 and the gear ratio fitment.

So, if you do seriously consider a swap, budget for the 360HP ISB with the Allison 3000 and any upgrade in differential gearing necessary to handle the increase in torque needed to deliver performance to expectation.

Alternatively, look at replacing the 6 speed Allison with the ten speed Allison to better utilize available torque. That package may well be available down the road and would make an excellent upgrade.

Alternatively and recommended ..... enjoy your coach. Dampen your expectations. Accept the capability, adjust to that reality, and travel with a smile.
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