On 8/5/2012 12:51 PM, Tamas Rudnai wrote: > I think doing this so is not a good idea anyways. You should apply the > break for holding the position of the car, not clutching with the manual = or > playing with the gas on an automatic. Agreed > I even ended up putting the gear > selector to neutral on the automatic when there is a longer red sequence = -- > as even at the idle speed it tries to pull the car a little bit which > abuses the drive train -- similar to holding the position on a slope -- a= nd > also burning more fuel in the meanwhile. Disagree, there is little or no movement, and the loading is well below=20 any loading issues The slippage occurs in the fluid coupling (torque=20 converter), which does create a minor amount of heat. The disengaging=20 and reengaging of the transmission clutches does create wear on the=20 clutch friction material ,though generally tolerable if not excessive. I=20 think the fuel savings if any would be minimal. Would be interesting to=20 see how the fuel injector timing is effected. With a good OBDII scanner,=20 this info is readily available. Holding on a slope with a manual clutch=20 is definitely not a good idea, but using the throttle on an a=20 transmission with a fluid coupling, where the clutches can be fully=20 engaged should not be an issue for short periods. The Ford Escorts with=20 5 speeds, the computer would open the throttle to maintain engine idle=20 speed if you left the clutch out slowly to hold on a hill. Wouldn't=20 recommend though. > On manual more people are doing > this so as pushing the clutch pedal makes your left leg tired. > > Tamas > > > On 5 August 2012 08:00, Sean Breheny wrote: > >> On Fri, Aug 3, 2012 at 2:26 PM, Gerhard Fiedler >> wrote: >>> But then there are the newer automatic transmissions of mostly European >>> descent. They are dual-clutch gearboxes, essentially a manual >>> transmission with a clutch that can be easier controlled automatically >>> than the clutch of a standard manual transmission. These together with >>> an electronic drivetrain controller gives an automatic transmission tha= t >>> has transmission characteristics that are more similar to classic manua= l >>> transmissions than to classic (hydraulic) automatic transmissions. >>> >> Gerhard, >> >> I am curious - do these dual-clutch automatic transmissions >> automatically slip the clutch to provide static torque? For example, >> what happens if you are facing up a hill and you try to apply just >> enough throttle to hold position on the hill? The torque-converter >> type transmission can just dissipate the engine's work as heat in the >> fluid of the converter. A person would normally do this by slipping >> the clutch on a manual transmission, I think. It would seem that the >> automatic transmission using clutches would have a higher risk of >> damaging the clutches if it were driven by someone who was used to the >> torque-converter type because there might be a lot of clutch slipping >> going on. >> >> Sean >> -- >> 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 .