how to prevent sudden jolt when shifting gears

[chuaed]

Re: how to prevent sudden jolt when shifting gears

get an automatic

[puroy]

get an automatic

baka go back to automatic...:P

[rpm10]

Practice lang yan.ganyan din ako nung una.basta wag lang talaga biglang ire-release yung clutch.

Ewan ko lang kung totoo yung pag nag-shift ka sa 2k rpm tipid sa gas.ang alam ko kasi mas maaksaya yun sa gas kasi mahihirapan yung makina mo dahil na sa mataas na gear ka na, nasa 2k pa lang rpm mo.hindi match yung engine speed sa transmission speed.pero ako nag-shishift na ako at 2.5k-3k rpm.nag-shishift din ako sa redline paminsan-minsan hehehe.

Correct shifting:

1st gear = 0-20 kph
2nd gear = 20-40 kph
3rd gear = 40-60 kph
4th gear = 60-80 kph
5th gear = 80 kph-above

Yan ang magiging speed niyo kapag nag shift kayo every 3k rpm.try niyo.

[woohoo]

Practice lang yan.ganyan din ako nung una.basta wag lang talaga biglang ire-release yung clutch.

Ewan ko lang kung totoo yung pag nag-shift ka sa 2k rpm tipid sa gas.ang alam ko kasi mas maaksaya yun sa gas kasi mahihirapan yung makina mo dahil na sa mataas na gear ka na, nasa 2k pa lang rpm mo.hindi match yung engine speed sa transmission speed.pero ako nag-shishift na ako at 2.5k-3k rpm.nag-shishift din ako sa redline paminsan-minsan hehehe.

Correct shifting:

1st gear = 0-20 kph
2nd gear = 20-40 kph
3rd gear = 40-60 kph
4th gear = 60-80 kph
5th gear = 80 kph-above

Yan ang magiging speed niyo kapag nag shift kayo every 3k rpm.try niyo.

Hindi po applicable iyan sa lahat ng sasakyan. Magkakaiba ang gear ratios ng mga sasakyan.

[Alpha_One]

Practice lang yan.ganyan din ako nung una.basta wag lang talaga biglang ire-release yung clutch.

Ewan ko lang kung totoo yung pag nag-shift ka sa 2k rpm tipid sa gas.ang alam ko kasi mas maaksaya yun sa gas kasi mahihirapan yung makina mo dahil na sa mataas na gear ka na, nasa 2k pa lang rpm mo.hindi match yung engine speed sa transmission speed.pero ako nag-shishift na ako at 2.5k-3k rpm.nag-shishift din ako sa redline paminsan-minsan hehehe.

Correct shifting:

1st gear = 0-20 kph
2nd gear = 20-40 kph
3rd gear = 40-60 kph
4th gear = 60-80 kph
5th gear = 80 kph-above

Yan ang magiging speed niyo kapag nag shift kayo every 3k rpm.try niyo.

Errr... as the previous poster indicated this doesn't apply to all cars. Try this on a Toyota Revo and you'll be around 4k RPM before you get into top gear! Consult your manual for the recommended shift points.

Actually, at the same rate of acceleration less throttle at a lower gear (higher RPM) consumes more fuel than more throttle at a higher gear (lower RPM) - for two reasons:

1) Friction and rotational losses

As engine speed goes higher, the amount of energy spent to keep the engine turning around with all the rotating and reciprocating masses and parts sliding together becomes higher also. Ergo, at higher engine speeds the engine uses more of the fuel to keep itself running than at lower speeds. This is why lower RPMs are more efficient than higher RPMs.

2) Throttling losses

You can think of an internal combustion engine as a sort of an air pump, and with gasoline engines the less you press on the accelerator the more the throttle is blocking the intake to regulate power by preventing air and fuel from entering. Although there is less fuel being mixed due to less air being taken in, this blockage makes it harder for the engine to breathe. Consequently it takes more energy (which comes from fuel) to suck in fresh air from the intake. It sounds counter-intuitive, but the way gasoline engines work pressing more on the accelerator pedal is actually more efficient than easing off while accelerating (up to a point, more on that later).

Note that this does not necessarily apply to diesels. This is one reason (among others) why diesel engines - which are unthrottled - are more efficient than gasoline engines. At idle, where the throttle would be almost completely closed in a gas engine, diesels consume almost nothing in comparison. This is also why the engine braking effect is much more pronounced with gasoline engines especially when you immediately lift off the accelerator. Heck, the exhaust brake on bigger diesel engines use this same principle to introduce more engine braking, introducing pumping losses by blocking the exhaust.

Some gasoline engine designs, those with throttle-by-wire and variable valve timing actually take advantage of this during crusing. Instead of closing the throttle when the driver eases off the pedal, the car delays the closing of the intake valve to dump unused mixture back to the intake manifold instead, to be used at the next cycle. This minimizes the pumping losses during cruising when the throttle would be otherwise closed. Some BMW and Honda engines do this, and I believe the Atkinson (?) cycle hybrid gasoline engines too.

The most efficient way to accelerate a gas powered car is actually to use 70-80%* open throttle and work your way quickly through the gears, trying to keep the RPM low (1500-2500RPM). Though this loads the engine more at lower speeds, the frictional and pumping losses of the engine are optimised such that you're actually using less fuel to accelerate. When you get to top gear and at your desired cruising speed quickly back off the throttle and enjoy the drive.

Many (manual transmission, <=2k RPM shifting) drivers are actually not taking full advantage of the economy offered by the high gears giving low RPMs by, strangely enough, not using enough accelerator before getting to their cruising speed on the highway! Acceleration uses much fuel, and you want to get to cruising speed as quickly as possible, using the least amount of distance possible, at the most efficient operation of the engine as possible. Cruising uses minimal power (and consequently minimal fuel), hence the sooner you get to cruising, the longer the distance you spend doing so, and the more fuel you save. With the open throttle technique you also used the least amount of fuel to get the amount of kinetic energy for your cruising speed, at least with a gas powered car.

(Let me just qualify the last couple of paragraphs by stating that this only applies to M/Ts where the driver can tightly control the RPMs by shifting to higher gears sooner. A/Ts tend to downshift when you give it more throttle.)

Of course this doesn't work all the time - for example if you find yourself in top gear losing speed up a steep hill with the pedal to the floor - it would be wise to use common sense and downshift. Also don't go too low on the RPMs as to lug the engine, this is hard on your crank, and your oil pressure will drop to dangerously low levels increasing engine wear.

*Beyond a certain point the engine computer goes into "open-loop" mode, disregarding the input of the oxygen sensor in the exhaust, reducing the precision of the fuel delivery of the car which is bad for fuel economy. Many engines use extremely rich mixtures at wide open throttle also, in order to cool the engine in anticipation of high heat created by prolonged increased engine loading. Hence 70-80% is the most fuel efficient (per drop of fuel) point for most gas engines.

[tuwato]

^ depende din sa sasakyan. parang yung nakikita ko sa ibang sasakyan e hindi pa nakaka abante e shift na kaagad. siyempre wala pa bwelo at mahihirapan lalo yung makina. syempre pag nahirapan yung makina, mas malakas din paglaklak niya ng gasolina.

tsaka depende din kung diesel o gas. diesel kasi e torquey kaya di mo masyado kailangan ng bwelo. di gaya sa gasolina.

para di kumadyot, try mo mag double clutch para mag rev match and practice proper shifting.

[tuwato]

^ depende din sa sasakyan. parang yung nakikita ko sa ibang sasakyan e hindi pa nakaka abante e shift na kaagad. siyempre wala pa bwelo at mahihirapan lalo yung makina. syempre pag nahirapan yung makina, mas malakas din paglaklak niya ng gasolina.

tsaka depende din kung diesel o gas. diesel kasi e torquey kaya di mo masyado kailangan ng bwelo. di gaya sa gasolina.

para di kumadyot, try mo mag double clutch para mag rev match and practice proper shifting.