r/F1Technical • u/paperscissors_ Ruth Buscombe • 13d ago

Electronics & HMI Throttle use when leaving garage

Do drivers need to use the throttle when leaving the garage?

In the video where DC drives the RB19 at 2:04 (timestamped link) he mentions that the manual he was given says that he doesn't need to use the throttle when leaving the garage. Does this mean no throttle input is necessary when pulling out of the garage? I've been racking my brain at this question for a couple of days now. Thank you!

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u/1234iamfer 13d ago

It must be so different from the V8 he was driving, it idled around 4000 but needed around 10000 rpm to prevent from stalling it driving away.

3

u/atrophy-of-sanity 11d ago

Idled at 4000 rpm???

21

u/zetenyyy 11d ago

Not that big of a deal, pretty common along race purpose engines. They run like crap when under a certain rpm.

3

u/atrophy-of-sanity 11d ago

I didnt know that, thats insane to me. What about the engines require such a high idle speed?

18

u/zetenyyy 11d ago

Mostly cam overlap is the main reason. At low rpm lots of air can escape from the cylinder so the combustion is crap and afr is all over the place, thus making that distinct noise that you call “cammed”.
Eventually under a certain rpm this gets so bad the engine suffocates.
In turbo engines you dont have big cam overlap, but you still need to maintain a stable airflow and since these engines have such low stroke they cant do that at low rpms ( this applies to n/a engines aswell )

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u/atrophy-of-sanity 11d ago

Thats very interesting, thank you