Timeline for How does double clutching work if gears spin at different rpms?
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| Aug 1, 2023 at 23:16 | comment | added | Allan Paul | @Pᴀᴜʟsᴛᴇʀ2 Ah okay, I think I understand. So although adding throttle input when the car is in neutral (and clutch is engaged) allows you to increase the speed the gears are spinning, it does not necessarily increase the rpms 1:1, and so double clutching comes down to feel and experience rather than just looking at engine rpm. | |
| Aug 1, 2023 at 23:12 | comment | added | Weather Vane | @AllanPaul by experience. When changing down (say 4 to 3) you need more engine revs for that road speed. When changing up, you need less, so with good timing you don't need to blip the throttle in that case, just let the revs drop. | |
| Aug 1, 2023 at 23:11 | vote | accept | Allan Paul | ||
| Aug 1, 2023 at 22:56 | comment | added | Pᴀᴜʟsᴛᴇʀ2♦ | @AllanPaul - Remember, the transmission you pose which requires double clutching, doesn't have synchros. Synchros in a newer transmission are what causes the gears to match speeds with or without driver intervention. In your transmission, it comes down to touch and feel of the driver. Once you get used to what you're doing, it becomes muscle memory. | |
| Aug 1, 2023 at 22:51 | comment | added | Allan Paul | @WeatherVane but if the gears are not spinning at the same speed, how is the driver able to determine what rpm they should rev the engine in order to minimize the work on the synchros? | |
| Aug 1, 2023 at 19:35 | comment | added | Weather Vane | @AllanPaul no, the gears do not all spin at the same speed in neutral. That's the point: the input is not connected to the output in neutral and they may spin at different speeds or not at all. It depends which side of the gearbox you are talking about, and whether the clutch is engaged or not, and whether the vehicle is moving. If the vehicle is moving and in neutral, when you engage the clutch, you can match the speed of the gearbox input (governed by engine rpm) to the output (governed by road speed). That's the idea of blipping in neutral. | |
| Aug 1, 2023 at 17:47 | comment | added | Allan Paul | Hi, thanks for responding!I think my confusion is from the fact that the synchros are needed because the gears spin at different speeds despite them all being connected to the input shaft. Does this mean that when you’re in neutral and revving the engine, the gears are all spinning at the same rpm as the input shaft. I’m kind of assuming that when in neutral the gears spin at the same rpm as the input shaft because I don’t really understand how someone would be able to precisely match the rpm of the gears when shifting in a car without synchros if the gears spun at different rates. | |
| Aug 1, 2023 at 10:10 | history | answered | Pᴀᴜʟsᴛᴇʀ2♦ | CC BY-SA 4.0 |