G5+
ZAF Ready
Cummins ISX CM870
ATS
Cummins ISX CM870 Sound & Engine Pack
Experience the unmistakable sound of the Cummins ISX CM870, professionally recorded from a Kenworth T800 and recreated in detail for American Truck Simulator.
The CM870 is one of the most recognisable early Cummins ISX platforms, combining strong low-RPM torque with the distinctive mechanical engine tone, turbo response and exhaust character associated with this generation of North American heavy-duty diesel.
Recorded from a real Kenworth T800, this pack captures the engine through its working range — from the heavy, textured idle and low-speed pull through to loaded acceleration, turbo spool and the unmistakable Cummins engine brake.
Six engine options are included, covering outputs from 450HP through to 690HP, giving the pack plenty of flexibility whether you're building a period-correct working truck, heavy hauler, or a higher-output CM870 setup.
G5+ Complete Rebuild
This release is a complete rebuild of the Cummins ISX CM870 pack using our latest G5+ production methods and FMOD framework. The result is improved RPM control, more natural transitions, refined turbo and load behaviour, greater depth, and a more complete 360-degree presentation throughout the driving experience.
What this pack is
A dedicated Cummins ISX CM870 Sound & Engine Pack for American Truck Simulator.
Recorded from
A real Kenworth T800 powered by a Cummins ISX CM870.
Included engines
450HP, 520HP, 560HP, 600HP, 620HP and 690HP.
What you can expect
The CM870 has a distinctly muscular soundscape, with a strong mechanical engine note, broad turbo presence and a forceful exhaust character that changes naturally as the engine comes under load.
Engine
Turbo
Engine Brake
Sound Features
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Professionally recorded Cummins ISX CM870 sound
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Recorded from a Kenworth T800
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Detailed engine, intake, exhaust and turbo layers
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Strong mechanical CM870 engine character throughout the RPM range
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Natural turbo spool-up and spool-down behaviour
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Dynamic exhaust and engine tone that responds naturally to load
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Detailed multi-stage Cummins engine brake
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Rich interior and exterior sound with 360-degree spatial presentation
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Convoy ready and ZAF Ready
6 Engine Options
CM870
Open Def
Engine Setup
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450HP, 520HP, 560HP, 600HP, 620HP and 690HP engine options
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Engine definitions designed around the Cummins ISX CM870 platform
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Realistic torque delivery across the available engine ratings
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Strong low-RPM pulling power suited to heavy-duty applications
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Power options suitable for fleet, heavy-haul and high-output builds
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Supports default trucks out of the box
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Additional modded trucks can be added using the Zeemods Def Generator
Included engine options
Six CM870 engine ratings are included, covering everything from everyday highway work through to substantially higher-output configurations.
Modded Truck Support
This pack supports default trucks out of the box and can be expanded to support additional modded trucks using the supplied Open Def files and the
Zeemods Def Generator.
Compatibility
Truck Support
Default & Modded
ZAF Ready
This pack is ZAF Ready, enabling additional framework-driven audio features where supported.
Classic Cummins ISX character.
From the mechanical low-RPM pull to the turbo, loaded exhaust and multi-stage engine brake, the CM870 delivers that unmistakable early ISX sound.
