Chewbacca 1st Gear April 3, 2012 Share April 3, 2012 Guys, got a very noob question. Assuming totally no obstructions (this means you are accelerating only. No need to brake or anything): Will it save more fuel to: always shift gear up ASAP or wait for current gear to go past optimal torque (or some other point) before shifting? Or is this car dependant? Thanks.... ↡ Advertisement Link to post Share on other sites More sharing options...
Vhtfhwlego Supercharged April 3, 2012 Share April 3, 2012 rev red line all the way... no issues ... I practice 2500 RPM from 1st to 4th & 5th at 2100RPM. Some practice 3000RPM... But my current car, 3000RPM then it will consider smooth... Because, it is an Auto box Link to post Share on other sites More sharing options...
So_nice 6th Gear April 3, 2012 Share April 3, 2012 haha difficult to ans u. last time when drive manual at least 3k rpm then change gear. now AT box hence it decides. sometimes in good moon i'll step harder though Link to post Share on other sites More sharing options...
Jamesc Hypersonic April 3, 2012 Share April 3, 2012 (edited) To save fuel get to the higest gear as soon as possible without labouring the engine. Smooth acceleration and smooth gear changes also help. If driving manual, match the engine speed to road speed. If changing up release accelerator, if changing down tap the accelerator. So gear changes cannot be felt and your passangers think you are driving an auto. This not only saves fuel, it also saves on wear and tear. Edited April 3, 2012 by Jamesc Link to post Share on other sites More sharing options...
Vhtfhwlego Supercharged April 3, 2012 Share April 3, 2012 To save fuel get to the higest gear as soon as possible without labouring the engine. Smooth acceleration and smooth gear changes also help. If driving manual, match the engine speed to road speed. If changing up release accelerator, if changing down tap the accelerator. So gear changes cannot be felt and your passangers think you are driving an auto. This not only saves fuel, it also saves on wear and tear. when changing up, I clutch in moments before I release accelerator... Link to post Share on other sites More sharing options...
Jamesc Hypersonic April 3, 2012 Share April 3, 2012 when changing up, I clutch in moments before I release accelerator... Thats the best way to do it. Link to post Share on other sites More sharing options...
Steptronic Supercharged April 3, 2012 Share April 3, 2012 Yes it depends on the car. But the general thumb rule is change gear every 10km/hr! Link to post Share on other sites More sharing options...
Good-Carbuyer 1st Gear April 3, 2012 Share April 3, 2012 (edited) Guys, got a very noob question. Assuming totally no obstructions (this means you are accelerating only. No need to brake or anything): Will it save more fuel to: always shift gear up ASAP or wait for current gear to go past optimal torque (or some other point) before shifting? Or is this car dependant? Thanks.... Assuming no strong headwind, flat paved road withno other vehicle around. Change up as soon as the engine can manage it. But the engine may have higher carbon built-up in the exhaust side after some mileage. I assumed manual transmission gearbox only. Edited April 3, 2012 by Good-Carbuyer Link to post Share on other sites More sharing options...
Good-Carbuyer 1st Gear April 3, 2012 Share April 3, 2012 Yes it depends on the car. But the general thumb rule is change gear every 10km/hr! Scamel? I believe need 9-speed gearbox to reach 90km/H then? Link to post Share on other sites More sharing options...
Good-Carbuyer 1st Gear April 3, 2012 Share April 3, 2012 To save fuel get to the higest gear as soon as possible without labouring the engine. Smooth acceleration and smooth gear changes also help. If driving manual, match the engine speed to road speed. If changing up release accelerator, if changing down tap the accelerator. So gear changes cannot be felt and your passangers think you are driving an auto. This not only saves fuel, it also saves on wear and tear. Assume along flat road with manual transmission: Changing up to higher gears (Example: 1st gear to 2nd gear):- Release accelerator pedal Depress clutch pedal Engage gear selected Release clutch pedal Press on accelerate pedal The car can be travelling as smoothly as the best auto-transmission, with this method Link to post Share on other sites More sharing options...
Steptronic Supercharged April 3, 2012 Share April 3, 2012 Scamel? I believe need 9-speed gearbox to reach 90km/H then? Are we not talking about "Manual" - 6 atmost! Link to post Share on other sites More sharing options...
Good-Carbuyer 1st Gear April 3, 2012 Share April 3, 2012 Are we not talking about "Manual" - 6 atmost! Heard that truck got 20-speed gearbox Link to post Share on other sites More sharing options...
Steptronic Supercharged April 3, 2012 Share April 3, 2012 Heard that truck got 20-speed gearbox Then the rule of thumb would be just change gear every 3km/hr Link to post Share on other sites More sharing options...
SimonTan 2nd Gear April 3, 2012 Share April 3, 2012 To keep accelerating you will need the power from the engine+gear ratio to deliver a sufficient turning torque to rotate the wheel faster and faster. To maintain the high speed, you just need to keep the wheel rotating at same rpm. Of course the car designer would have designed the gear ratio at the highest level to supply just sufficient torque to maintain the car speed, taking in account passenger load, air resistance etc. So most highest gear ratio is still not fuel efficient. Which is why now we have 8-9 speed gear boxes, to further improve the fuel economy during those constant speed situation. When need to overtake or increase speed, the gearbox will drop down to say 5-6 for that extra ommp. Link to post Share on other sites More sharing options...
Nzy Twincharged April 3, 2012 Share April 3, 2012 If moving off when I am not the first car at the traffic lights or when I am not in a hurry I change at about 2000rpm. This gives me beter FC. Link to post Share on other sites More sharing options...
Chewbacca 1st Gear April 3, 2012 Author Share April 3, 2012 7 speed DSG. So, it's kind of both. I'm driving it manual, so clutchless manual, I guess? Link to post Share on other sites More sharing options...
Mecontle 1st Gear April 3, 2012 Share April 3, 2012 someyimes i pick up faster but not insanely to cruise speed at 90 & use 6th gear all the way, 1 time its around 15.8kml from a fresh reset on fc digits , tuas to changi no jam Link to post Share on other sites More sharing options...
Good-Carbuyer 1st Gear April 3, 2012 Share April 3, 2012 Then the rule of thumb would be just change gear every 3km/hr I believe none of them (WW2 leftovers) around here these days . ↡ Advertisement Link to post Share on other sites More sharing options...
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