this post was submitted on 22 Dec 2023
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STOP DOING SCIENCE
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Hill starts on an automatic are nothing. As soon as you let off the brake the torque converter will more-or-less hold the car in place until you get over to the accelerator pedal. There used to be (hell maybe still is) a bad-habit of drivers where they wouldnt use brakes at all while stopped on a hill and just let the transmission “hold” the car in place. This is bad because it causes the transmission to heat up from the excess pressure and it’s unsafe.
If the hill is steep enough, gravity can overcome the transmission and you can roll backwards, but just press on the go pedal and you start going forwards. There’s no stalling, just “slipping” internally in the transmission at the torque converter, which is exactly what it’s designed to do.
What about dct?
There's no torque converter.
Those are often starting less smooth in my experience.
I once had a VW Transporter with torque converter that always rolled backwards slightly. (Only very slightly) It appeared that it disengaged the whole torque converter while stopped. (The rpm "relaxed" after stopping.) That was a bit weird.
You know your not supposed to take 10 seconds to move your foot from the brake to the gas pedal, right?
(dontfeedthetrolldontfeedthetrolldont.. ah, damnit!)
The torque converter is usually always engaged, always wants to go, while holding the brake. As soon as the brakes are released the car starts rolling forward.
With the VW T4 that didn't work as on other cars since the torque converter was disengaged while stopping.
So the driver had to change to the accelerator more quickly than usual, if starting uphill.
Otherwise, since the torque converter engaged only a second after releasing the brake, the car would roll approximately 5cm backwards before going forward. (If starting without any accelerator input.)