what do the current f1 engines idle at? and what is the max rpm when racing?
Yep......to preserve the reliability of the components that each team is allowed to have in each season. Don't ask me about qualifying trim, but I'm assuming it's a bit higher.
That Mercedes road car with F1 engine has been delayed several times because they couldn´t make the engine work at a reasonable idle for road use. I don´t know in what state is the project now.
https://qa-all.com/en/Q&A/page=5d38e4ec10610ced72686b28b8bb5cba https://www.mercedes-amg-hpp.com/formula-1-engine-facts/# << No mention of idle speed though https://sport-net.org/what-is-the-0-to-60-of-a-f1-car/ Seems its 4k F1 technical regulations say this 5.7.4 The idle speed control target may not exceed 4,000rpm.
Back in the V10 era (nearing 20K RPMs) they would idle nicely at 3,000 RPMs (similar to the Lauda era N/A engines with 12K RPM Red Lines) Since these new V6s arrived and are fuel consumption limited around 13K RPMs, they should be able to idle down near 2,000 RPMs, maybe a bit lower. But there is no particular advantage in being able to idle that low; so Idle might well be set <roughly> as high as possible so any throttle movement goes directly into kicking the turbo into gear.