Third to Fifth

[craigant]

always go from thrid to fifth when im drivin in petrol savin mode. Just want to know if this is unhealthy for my gearbox or clutch at all or is it fine to do???????

[Viper]

how does it save petrol?

[adamsax]

You're block changing.




































That's about it.

[craigant]

it doesnt obviously just when im drivin slow and just go from third to fifth because i dont need the revs of fourth

[shooorn94]

You block change down, why would it be any different going up? You're fine doing it mate, I've done it in the past just feels weird still :p

[Mystic]

Its fine to do and causes no significant wear etc, if your driving in "petrol saving mode" (apart from the very act of driving, which uses petrol rather than saves it) you should use the gears in sequence both upwards and back downwards.

Theres a terrific guide written about how to economise you petrol usage whilst driving if your really interested: http://www.saxperience.com/forum/showthread.php?t=59943

[Spanky]

i somtimes go from 2nd to fifth, and im usually in petrol saving mode, aslong as your going over 20mph 5th is fine all the way! unless going p hills etc where 4th will do!

[Barry123]

Its fine to do and causes no significant wear etc, if your driving in "petrol saving mode" (apart from the very act of driving, which uses petrol rather than saves it) you should use the gears in sequence both upwards and back downwards.

Theres a terrific guide written about how to economise you petrol usage whilst driving if your really interested: http://www.saxperience.com/forum/showthread.php?t=59943

....and I've really got to rewrite it when I've got time!

Cheers though Mystic :)

[AlexR]

It will wear the synchro rings more than changing one gear at a time because there will be a bigger speed difference between the spinning output shaft and the actual gear.

[djawesome123]

I do it all the time, never seems to have any side effects

[nazz1]

It will wear the synchro rings more than changing one gear at a time because there will be a bigger speed difference between the spinning output shaft and the actual gear.

interesting

i shall always go through the gears in future

[mattknight1984]

2nd to 5th is just stupid.

[vidal]

2nd to 5th is just stupid.

5th to 2nd (thanks Mrs V) whilst still at 60 makes for some rather spectacular engine braking.

V.

[danzman1991]

Neutral ftw

[vtrchris64]

i somtimes go from 2nd to fifth, and im usually in petrol saving mode, aslong as your going over 20mph 5th is fine all the way! unless going p hills etc where 4th will do!

you'd probably use more petrol accelerating in 5th from 20 than just changing up normally

[Andi9386]

So long as you get the speed and revs down low enough, you can block change down, without doing too much damage to your gearbox.
If you don't get it just right you will significantly damage your Engine, Gearbox, and Gears.

[young-saxo]

anybody ever done a 1st to 5th? i have lol :P

[Andi9386]

No.
When I was taking lessons, the first two car's my istructor had, were 5speed gearbox's, and trying to get into 5th used to be a challenge as you had to really heave the gearstick towards you to get into 5th, then you'de suddenly hear the engine over rev, so it was a case of back into 4th, then try again.

The last car my Instructor had, was a 6speed sports Gearbox, so above 45mph in 4th you could just skip 5th and go straight to 6th.
So much easier.

[Tupps]

i do it, just to hear the flat 4 rumble

[Andi9386]

Ah now thats different.
Love the sound of the Flat Four.

[biteme]

lol synchro will wear but unless ur gonna keep the car till its got 200k on it it wont go lol
you see some old landies with buggered synchro mesh thats entertaining getting the revs to match the gear hehe
if you wanna go to extremes to save your gearbox get your double de clutching going

also you are causing a LOT of wear on your engine putting it in 5th at 20... i mean ideally for economy about 2k revs is best so changing to keep it around there or just below to save strain so 4th for 30 and 5th for 40 and above....

finally decelerating from say 60 or 70 in fifth where many people will "dump" it in neutral will use more petrol than letting it run down in gear as the motion of the car is driving the pistons and very little fuel is put in whereas in neutral the engine must maintain combustion at a fair level to keep it ticking over, this does vary on cars as some newer ones keep putting petrol in when the accelerator is released and decelerating in gear.

[Morgan_VTR]

i somtimes go from 2nd to fifth, and im usually in petrol saving mode, aslong as your going over 20mph 5th is fine all the way! unless going p hills etc where 4th will do!

If your revs are too low in a certain gear your will starve/choke your engine - depriving it of the necessary power.

This will cause the car to inject more fuel hence you wont be saving any rather using more!

[David]

Neutral ftw

That uses more petrol!

[JBVTR]

On a side note can someone explain double clutching/declutching to me thanks

[Morgan_VTR]

On a side note can someone explain double clutching/declutching to me thanks

A double clutch (also called a double declutch) is a driving procedure primarily used for vehicles with an unsynchronized manual transmission.

In a gearbox with neutral between each gear, a typical shift actually involves two gear changes, once into neutral, and again into the next gear. During any shift, disconnecting drive components via a clutch properly unloads the engine and transmission of undue pressure applied by the opposing components. Fully utilizing the clutch for each shift out of, and then into each gear is double clutching. Due to the absence of a neutral spacing, double clutching is ill-advised for sequential gear changes, as in a fully sequential gearbox such as a sportbike.

Obviously simply not releasing the clutch pedal while in neutral such as in a typical shift is much more efficient than double clutching and second only to sequential or non clutch shifts. However, excess wear can take place on the separated clutch plates anytime the engine and transmission vary drive loads. Double clutching can minimize this clutch plate wear when extended durations occur between matching engine and transmission drive pressure, such as at a stop light.

Before the introduction of transmission synchronizers (in the 1920s) and helical cut gears, double clutching was a technique required to prevent damage to an automobile's gear system. Due to the difficulty and most often unneccessary redundancy involved in learning the technique, coupled with the advent of synchronized gearing systems, it has largely fallen into disuse. However, drivers of large trucks often use the double clutching technique when unable to keep the transmission unloaded during shifting, as large vehicles are usually equipped with older, simpler and more durable unsynchronized gearboxes.

The purpose of the double-clutch technique is to aid in matching the rotational speed of the input shaft being driven by the engine to the rotational speed of the gear you wish to select (directly connected to rotating wheels). When the speeds are matched, the gear will engage smoothly and no clutch is required. If the speeds are not matched, the dog teeth on the collar will "crash" or grate as they attempt to fit into the holes on the desired gear. A modern synchromesh gearbox accomplishes this synchronization more efficiently. However, when the engine speed is significantly different than the transmission speed, the desired gear is often unengageable even in a fully synchronized gearbox. An example is trying to shift into a gear while traveling outside the gear's speed or directional range, such as reverse while moving forward.

Double clutching, although time consuming, eases gear selection when an extended delay or variance exists between engine and transmission speeds. When shifting up on a non-synchroniser equipped vehicle, the clutch pedal is pressed, the throttle is released, and the gearbox is shifted into neutral. The clutch pedal is then released. As the engine idles with no load, the RPM will decrease until they are at a level suitable for shifting into the next gear. The driver then depresses the clutch again and shifts into the next gear. The whole manoeuvre can, with practice, take no more than a fraction of a second, and the result is a very smooth gear change.

Conversely, in order to downshift, engine RPM must be increased while the gearbox is in neutral and the clutch is either engaged or disengaged. This requires the driver to shift into neutral, apply throttle to bring the RPM up to a suitable speed, and finally shift into gear. This operation can be very difficult to master, as it requires the driver to gauge the speed of the vehicle and throttle accurately. Double clutching occurs if the clutch pedal is released while matching engine speeds in neutral and again engaged prior to shifting into the next gear.

A related downshifting technique is called Heel-and-Toe, during which the brake and accelerator pedal are pressed by the right foot while the clutch pedal is pressed by the left foot. This aids both slowing the vehicle while at the same time accelerating the engine for a matched downshift. Note that Heel-and-Toe should be used with any type of gearbox when simultaneous braking and downshifting is necessary. Though difficult, mastering the Heel-and-Toe technique in conjunction with necessary clutching is essential for high performance driving (e.g., Rally racing) because driving as fast as possible is only achieved when in the optimal gear regardless of the simultaneous braking, accelerating, and clutching required for shifts. Left foot braking while accelerating the engine with the right foot to accommodate downshifting in a clutchless situation accomplishes the same feat.

The purpose of the heel-toe-double-clutch is to downshift into the correct gear for exiting the corner while not wasting speed or time during or after the turn while placing the least wear and tear on the entire drivetrain. This is typically seen when avoiding a shift through each gear such as when the vehicle is slowing faster than one prefers to downshift, such as a rapid speed drop from the highest to lowest gear. Oftentimes racers will simply clutch into neutral and wait for the vehicle speed to match the desired gear and then clutch again into that gear instead of shifting through every gear in between.

Search is your friend. Im just extremely bored. :)

[JBVTR]

Search is your friend. Im just extremely bored. :)

Not mine i just get every thread with the word clutch in lol

thanks mate rep'd :y: