Battle of the Transmissions: M/T vs. A/T

**dr1v3r** · July 16th, 2016 11:03 PM

Originally Posted by myas110

sorry kung medyo tamad ako mag backread. what are the similarities and differences ng conventional A/T and CVT? (aside from they shift the gears automatically)

kasi may napansin akong comments sa FB na mas OK ang A/t kaysa sa CVT.

Gusto ko din malaman to

**Jun aka Pekto** · July 22nd, 2016 08:52 PM

Originally Posted by myas110

what are the similarities and differences ng conventional A/T and CVT? (aside from they shift the gears automatically)

Supposedly, CVTs shift smoother and are more fuel efficient. My wife's 2013 Nissan Rogue has a CVT. When accelerating, it has a weird droning sound some people may find irritating. But once at cruising speed, it's very smooth and quiet.

**GTi** · July 22nd, 2016 10:05 PM

Our '06 Tribute exhibits very noticeable shift shock, especially when driving on a light foot. The shortage of gears (4AT) is very evident as it is very fond of upshifting (and suddenly roaring at 4000rpm) even with just a slight dip on the throttle. Our '05 Accord on the other hand has a very smooth tranny with almost imperceptible shifts. Gears (5 of them) are very well spread too. No unexpected upshifts here. Despite not having manual override, I hardly ever find myself wanting it.

Our A/T's hardly ever give us any trouble, besides having to replace the engine and transmission supports in the Tribute that is...

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**jut703** · July 22nd, 2016 10:37 PM

Originally Posted by GTi

Our '06 Tribute exhibits very noticeable shift shock, especially when driving on a light foot. The shortage of gears (4AT) is very evident as it is very fond of upshifting (and suddenly roaring at 4000rpm) even with just a slight dip on the throttle. Our '05 Accord on the other hand has a very smooth tranny with almost imperceptible shifts. Gears (5 of them) are very well spread too. No unexpected upshifts here. Despite not having manual override, I hardly ever find myself wanting it.

Our A/T's hardly ever give us any trouble, besides having to replace the engine and transmission supports in the Tribute that is...

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I don't think it has anything to do with the number of gears. Our old 2.0 Altis had a 4AT and that behaved very differently from my 2.0 Mazda 3. Same power, same number of gears. The Altis doesn't shift down unless you really floor it, and has virtually no shift shock. The Mazda is very responsive, but has shift shock sometimes (4th to 2nd and 1st to 2nd).

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**GTi** · July 22nd, 2016 11:04 PM

I suppose it has more to do with the gear ratios then. The Tribute's tranny shifts readily from 2nd to 3rd but seems to take forever to shift from 3rd to 4th. It jerks from 1st to 2nd and 3rd to 2nd too.

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**jut703** · July 22nd, 2016 11:22 PM

Originally Posted by GTi

I suppose it has more to do with the gear ratios then. The Tribute's tranny shifts readily from 2nd to 3rd but seems to take forever to shift from 3rd to 4th. It jerks from 1st to 2nd and 3rd to 2nd too.

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Ratios are roughly the same too for the Altis and Mz3 2.0. 1st gear tops out at around 60 kph, 2nd gear at 120, 3rd gear at 180-190. The Mazda's 4th gear does seem longer though (or it's too heavy to breach 200 kph).

I think it just boils down to different ECU/TCM programming - one is for smoothness, the other for quick response.

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**GTi** · July 22nd, 2016 11:31 PM

I can hardly imagine reaching those speeds with those corresponding gears. 180-190 at 3rd gear? [emoji33]

And then again, with a traditional PRND21 gearbox, is it safe to move it through "1", "2", "O/D off" and "D" while the car is moving?

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**jut703** · July 22nd, 2016 11:56 PM

Originally Posted by GTi

I can hardly imagine reaching those speeds with those corresponding gears. 180-190 at 3rd gear? [emoji33]

Yup.[emoji4]

Edit: Looks like 3rd tops out at 175-180 as I just shifted into 4th here.

Originally Posted by GTi

IAnd then again, with a traditional PRND21 gearbox, is it safe to move it through "1", "2", "O/D off" and "D" while the car is moving?

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Yup again. Did it all the time with my Vios, no problem at all. The Mazda and Altis had sequential (+/-) shifters though.

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**GTi** · July 23rd, 2016 11:27 AM

Originally Posted by jut703

Yup.[emoji4]

Edit: Looks like 3rd tops out at 175-180 as I just shifted into 4th here.

Yup again. Did it all the time with my Vios, no problem at all. The Mazda and Altis had sequential (+/-) shifters though.

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Damn! Where did you do that?! And how's the FC of your Mazda 3? I get only 4km/L with the Tribute. Doesn't matter that I try to keep the revs below 2000rpm most of the time...

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**jut703** · July 23rd, 2016 11:39 AM

Originally Posted by GTi

Damn! Where did you do that?! And how's the FC of your Mazda 3? I get only 4km/L with the Tribute. Doesn't matter that I try to keep the revs below 2000rpm most of the time...

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SCTEX. The Mazda's FC is terrible in the city:

Overall average is just 5.72 km/L, but that's because it's used almost exclusively for rush hour driving (Pasig-Makati CBD and back, average speed less than 10 kph). I once did 18 km/L on the highway though, at a constant 75-80 kph throughout the entire 200+ km journey.

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