# \#idle

**URL:** https://community.tunersguild.com/tag/idle/197.md

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## [How low can I set diesel idle — and why does every engine love 900 RPM?](https://community.tunersguild.com/t/how-low-can-i-set-diesel-idle-and-why-does-every-engine-love-900-rpm/251)

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**Author:** [@stanislav](https://community.tunersguild.com/u/stanislav)\
**Replies:** 0\
**Last updated:** [July 24, 2026, 8:29am UTC](https://community.tunersguild.com/t/how-low-can-i-set-diesel-idle-and-why-does-every-engine-love-900-rpm/251 "2026-07-24T08:29:33Z")

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The safe minimum idle on a modern diesel: keep the target at least over 800 RPM, set 900 as the everyday answer, and go to 1000 for a sport build. The reason is not preference — the engine-and-gearbox assembly has a reso…