i've read up regarding those transmissions, but i still don't quite get it.

AT - http://en.wikipedia.org/wiki/Automatic_transmission
AMT (semi-auto?) - http://en.wikipedia.org/wiki/Semi-automatic_transmission

from what i see, AMT (like the ones found on Savvy) is like MANUAL but you have a little-monkey somewhere doing the clutch work based on certain input the internal computer gathers.

but how does that differ compare to AT? considering that both changes gear automatically as you drive.

AMT dun change gear automatically. u only no need to clutch.

oh izzit?



here's the thing (probably the info that mislead me)

look at this, refer to page 2.

http://www.proton-edar.com.my/user_data/me...e_savvy_amt.pdf

now it says to the left is Automatic / Manual selection. so what does that actually mean?

i thought it meant that with AMT i could
1. automatic - drive it like how i would drive an auto, where it changes gear for me.
2. manual - drive it like manual, just that the gear goes up / down instead of the usual H shape.

some more in Page 3 it mentioned

With the ability to switch between manual and automatic driving mode at the tap of a gearlever.

so.........which is which now?

This post has been edited by goldfries: Sep 5 2006, 05:04 PM

Manual clutches are more efficient then Automatic gears which requires torque converters. That's why they are more powerful and fuel efficient.

AMT is using Manual clutch technology but it takes away all the stupid torque converter and junks and have a monkey change your gears instead...

So it is like the ease of an Auto Gear but the power of a manual gear.

dunno about other cars, nv see before, but for savvy this is real.
the gear can switch between D,1,2,3,4,5,R and N, no P though.
and.. no clutch

which makes me quite confused between auto and amt also

The meaning should be when you are in Auto Gear 3 / 4 or else , you can change to Manual .
or the other way round.

Manual gear 4 to auto or so on.

I guess la.

this one pretty much summarizes it nicely. thx.

like said earlier, automatic tranny requires a torque converter which is a series of plates and clutches that sap power from the engine to operate thus creates an ineficientcy compared to a manual clutch

amt IS NOT AN AUTOMATIC, it is technically a manual but with a hydraulically actuated clutch (the monkey) conected to a ecu. what it does is that the engages and disengages the clutch for u when u want to change gears. in simple terms, if u want the computer to do the gear switching for u, just pop it in auto mode and the ecu will do the rest. the gear stick is not mechanically connected to the gearbox compared to a manual, but connected by a wire to the ecu, with this then u can do ala steptronic.

My 2 cents,

AMT = Automated Manual Transmission = Automatic clutch activation.

A manual gearbox but with a monkey doin the engaging and disengaging the clutch.

Standard Auto = 'Oil based' transmission, smooth since most new cars are installed with electronically controlled boxes

AMT = autoclutch manual car. Need to release pedal abit when shifting else will jerk.

The Savvy one is also a sequential right? Up/down for upshift/downshift?

Sequential in quick succession. It 's possible with AMT.

Guys check and compare the PRICE of PROTON's torque converter with AMT gearbox...you will be shocked to death.

Can AMT(or in this article, SMT) really perform rev-matching like mentioned in this article?

SMTs can also perform matched-rev (our double-clutch) downshifts: When the driver downshifts, the SMT disengages the clutch, shifts to neutral, and re-engages the clutch. The SMT calculates what the engine RPMs will be in the next-lowest gear based on the current road speed, and revs the engine (and, since the clutch is engaged, the transmission) to that speed. It then disengages the clutch, shifts into the lower gear, and re-engages the clutch. The result is a smooth change with no jerk and no sudden deceleration.

EDIT:
@hypermount.
Now I see the AMT costs half as much as an Auto.
Wow, higher tech but at a lower price.

This post has been edited by tunertoobe: Sep 7 2006, 04:52 PM

the savvy AMT cannot do that, but if u get your timing right, doing heel and toe will make changes smooth. its not the latest in technology like the offerings from BMW and the newer alfa's. however if left in full monkey mode (auto), u do have to lift off the throttle to get good upshifts without jerks. to make a comparison, just think of alfa's first generation 156 (if u have driven one or sat in one) and u would not be too far off...

and yes, the AMT gearbox price is the same as a manual price but i dunno how much is the actuator.
i dunno bout savvy but the last time i asked proton how much was waja auto and was quaoted 22K.

I see, well that's enough to put me off.
I want to practice heel and toe.

dont be put off lah, at first i also like that, but then after driving it, my mind changed, then power and handling is great for a car at that price. the gearchange will be much better once u get used to it...

Hehe, I know it'll be more fun. But I want to try good ol' manual first.

yaya... manual still da best... i have trash... ehem...driven 2 cars in manual and one in AMT, the manual clutch is kinda short and high (like an on off switch), quite hard to modulate... both manual cars like that... so i think its the character and takes some getting used to. but the gearchanges are accurate and snappy, but u do feel quite a bit of vibrations on the gearknob when accelerating in gear.

H&T on Savvy AMT is easier, only got 2 pedals to work on .

The vibrations on the Savvy gearknob is due to rod-linkage system being used which is directly connected to the transmissionas. Many other compact cars use cable-actuated shift mechanism. Rod-linkage is more sturdy built.

When you feel the vibrations, you will feel like the car is alive and pulsating. You can feel the car passionately.

Sequential just means that the gearbox do not use the H shift pattern. Anything that uses a those flappy pedals or up/down gear sticks and you are required to shift in a sequence are called sequential gearboxes.

So the AMT is a sequential gearbox as you have to shift the gear from 1 to 2 to 3 and cannot jump from 1 to 3 like a standard H configuration gearbox.