However, my understanding is that it is considered good practice to slip the clutch momentarily when starting out uphill in a manual transmission car. If you don't do that, I think that you would have to rev the engine up enough so that the flywheel inertia would prevent the car from stalling when you suddenly let the clutch out, and this would result in a jerky motion. I drive manual cars, trucks, vans and bikes and never did that. This might be necessary if you push your engine to the limit and you have no more powe= r (or almost to the limit). But don' t know. Eventually I'll switch down gears. What I know for sure is that with manual gearboxes, you, the driver must anticipate what the engine will need not to stall it. -----Mensaje original----- De: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu]En nombre de Sean Breheny Enviado el: Lunes, 06 de Agosto de 2012 08:40 a.m. Para: Microcontroller discussion list - Public. Asunto: Re: [OT] Automatic is more fuel efficient than manual? Disclaimer: I have never driven a manual so this is only from my theoretical knowledge. Just to be clear - I was not suggesting that people should use the throttle to hold continuously on a hill in either manual or automatic transmission cars. However, my understanding is that it is considered good practice to slip the clutch momentarily when starting out uphill in a manual transmission car. If you don't do that, I think that you would have to rev the engine up enough so that the flywheel inertia would prevent the car from stalling when you suddenly let the clutch out, and this would result in a jerky motion. In fact, when I drive (an automatic), I usually press both the brake and the gas pedal briefly when starting out up a steep hill because it makes for a much smoother start. I was wondering if the clutch-based automatics also did this maneuver (i.e., slip the clutch) and if so, how do they deal with the abusive situation where someone tries to hold the car on a hill continuously. In a torque-converter type transmission, I think that this is relatively harmless so that some people may have gotten into it as a bad habit and never noticed problems. Such a person might have a lot of problems if he switched to a clutch-type automatic and wasn't aware of the difference, unless these transmissions had some way to protect their clutches. Sean On Mon, Aug 6, 2012 at 4:32 AM, wrote: >> The Ford Escorts with 5 speeds, the computer would open the throttle >> to maintain engine idle speed if you left the clutch out slowly to >> hold on a hill. Wouldn't recommend though. > > My manual Ford Mondeo does this as an anti-stall mechanism. Makes for nic= e manoeuvring without having to blip the accelerator. Does create a problem though if you don't change down early enough when meandering around tight British suburban streets and the anti-stall keeps 'pushing' the car as the engine revs drop. > -- > Scanned by iCritical. > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .