Jump to content

MyCarForum Logo
Search
Vehicles with Transmission

  • Search this thread
49 replies to this topic | 0 praises

#1

Posted 14 January 2009 - 10:39 AM

Mikeyeo
  • Mikeyeo
    4th Gear
    The points of the user determines the rank. The higher the points, the higher the rank.
    The bar represents the rank and points of the user. The longer the bar, the higher the rank and points.
     
    Points:
    Points are accumulated from other users who Praise or Disliked this users' posts.
    796
      Joined: 13 July 2006
      Posts: 789
     
Having read many postings from forumers that vehicles with CVT transmission have the perception of being slow in pick-up such as the Mirsubishi Lancer, I came across an article on CVT and wish to share some light with forumers.

What is CVT?

CVT (Continuous Variable Transmission) provides the driver with more power, better fuel economy and a smoother driving experience when compared to a traditional automatic transmission. No wonder many car manufacturers like Nissan and Honda are replacing their vehicles’ automatic transmission with the CVT.

CVT gets the engine to the peak torque and maintains it over a wide range of vehicle speeds by varying the transmission. Unlike conventional transmission where the ratio is changed by shifting the gears, the CVT allows an almost limitless number of engine speeds to vehicle speed ratio. This cannot be achieved by an automatic transmission vehicle because there is no gear to tie a given road speed. The limitless number of gear ratios also means that the nudging motion caused by shifting is no longer present. Since the engine is operating at its optimum power range, excellent fuel economy and less gas emission are also obtained.

Flooring the accelerator pedal of a CVT vehicle gives a smooth and rapid increase to the maximum power unlike a automatic transmission vehicle which brings a sudden burst of power causing the vehicle to lurch forward. The sound from the CVT vehicle’s engine also will not change much compared to the automatic transmission vehicle. Many drivers mistook the smooth increase of speed as lack of power due to CVT. In actual fact, the acceleration of the CVT vehicle is much faster compared to the automatic transmission vehicle.

#2

Posted 14 January 2009 - 10:43 AM

Chickensoup
  • Chickensoup
    4th Gear
    The points of the user determines the rank. The higher the points, the higher the rank.
    The bar represents the rank and points of the user. The longer the bar, the higher the rank and points.
     
    Points:
    Points are accumulated from other users who Praise or Disliked this users' posts.
    686
      Joined: 15 December 2008
      Posts: 685
     

Having read many postings from forumers that vehicles with CVT transmission have the perception of being slow in pick-up such as the Mirsubishi Lancer, I came across an article on CVT and wish to share some light with forumers.

What is CVT?

CVT (Continuous Variable Transmission) provides the driver with more power, better fuel economy and a smoother driving experience when compared to a traditional automatic transmission. No wonder many car manufacturers like Nissan and Honda are replacing their vehicles’ automatic transmission with the CVT.

CVT gets the engine to the peak torque and maintains it over a wide range of vehicle speeds by varying the transmission. Unlike conventional transmission where the ratio is changed by shifting the gears, the CVT allows an almost limitless number of engine speeds to vehicle speed ratio. This cannot be achieved by an automatic transmission vehicle because there is no gear to tie a given road speed. The limitless number of gear ratios also means that the nudging motion caused by shifting is no longer present. Since the engine is operating at its optimum power range, excellent fuel economy and less gas emission are also obtained.

Flooring the accelerator pedal of a CVT vehicle gives a smooth and rapid increase to the maximum power unlike a automatic transmission vehicle which brings a sudden burst of power causing the vehicle to lurch forward. The sound from the CVT vehicle’s engine also will not change much compared to the automatic transmission vehicle. Many drivers mistook the smooth increase of speed as lack of power due to CVT. In actual fact, the acceleration of the CVT vehicle is much faster compared to the automatic transmission vehicle.

CVT is unable to take high torque and high power. Generally used in smaller engines. Those 1st Generation CVT used in Subaru Justy, the metal belt always get roasted.

#3

Posted 14 January 2009 - 10:44 AM

Sgnick
  • Sgnick
    6th Gear
    The points of the user determines the rank. The higher the points, the higher the rank.
    The bar represents the rank and points of the user. The longer the bar, the higher the rank and points.
     
    Points:
    Points are accumulated from other users who Praise or Disliked this users' posts.
    3,465
      Joined: 23 January 2007
      Posts: 3,458
     
Example, Toyota Sienta, 1.5L with CVT, at 100kmph, RPM is 2K.

BTW, if u suddenly floor the pedal, there is a rubberband effect for CVT, a very slight delay followed by a sudden surge in acceleration. I think delay also partly due to e-throttle.
Hey, I have my own personal MCF stalker! Have u gotten yours yet?
QUOTE (Booboon @ Jan 24 2011, 12:05 AM) *
Er, something abt sgnick if that might interest u.
1. Drives an opc g spec sienta. Green colour.
2. Lives in hougang and has alot of money. At least that wat he claims.
3. Is a Chinese male in his 30s n wear specs.
4. Hangs around sgsienta. The forum is dead anyway.

#4

Posted 14 January 2009 - 10:50 AM

Watwheels
  • Premium member
    Watwheels
    2Fast2Furious
    The points of the user determines the rank. The higher the points, the higher the rank.
    The bar represents the rank and points of the user. The longer the bar, the higher the rank and points.
     
    Points:
    Points are accumulated from other users who Praise or Disliked this users' posts.
    22,170
      Joined: 21 May 2006
      Posts: 18,569
     
Must see what engine the CVT gearbox is mated to and the transmission programming.

If the CVT is mated with a big CC with TC like in an Audi, I dun think the acceleration will be sluggish.

If mated to a 1.5L engine like the big/heavy bodied Lancer EX, common sense will tell you it's not a performer which the CVT is not at fault.

Driving an unker mid-size MPV now :(

Upside: It churns out 258Nm of Torque :) ....up from 200Nm :p


#5

Posted 14 January 2009 - 10:51 AM

Ncss
  • Ncss
    5th Gear
    The points of the user determines the rank. The higher the points, the higher the rank.
    The bar represents the rank and points of the user. The longer the bar, the higher the rank and points.
     
    Points:
    Points are accumulated from other users who Praise or Disliked this users' posts.
    2,458
      Joined: 28 September 2005
      Posts: 2,458
     

CVT is unable to take high torque and high power. Generally used in smaller engines. Those 1st Generation CVT used in Subaru Justy, the metal belt always get roasted.


OIC... I keep wondering why mercedes uses CVT for their smaller A/B-class but not in their big brother E/S-class... rolleyes.gif
====================================================
My car is slow..., please don't laugh at me [:)].

#6

Posted 14 January 2009 - 10:55 AM

Iziz
  • Iziz
    6th Gear
    The points of the user determines the rank. The higher the points, the higher the rank.
    The bar represents the rank and points of the user. The longer the bar, the higher the rank and points.
     
    Points:
    Points are accumulated from other users who Praise or Disliked this users' posts.
    2,605
      Joined: 14 May 2006
      Posts: 2,605
     

CVT is unable to take high torque and high power. Generally used in smaller engines. Those 1st Generation CVT used in Subaru Justy, the metal belt always get roasted.


Main killer of CVT is torque, not horsepower.

Agree with bro Watwheels, u need higher CC for CVT transmission in order not to have to sluggish effect. Personally I think at least a 2L.

#7

Posted 14 January 2009 - 11:04 AM

Chickensoup
  • Chickensoup
    4th Gear
    The points of the user determines the rank. The higher the points, the higher the rank.
    The bar represents the rank and points of the user. The longer the bar, the higher the rank and points.
     
    Points:
    Points are accumulated from other users who Praise or Disliked this users' posts.
    686
      Joined: 15 December 2008
      Posts: 685
     

OIC... I keep wondering why mercedes uses CVT for their smaller A/B-class but not in their big brother E/S-class... rolleyes.gif

CVT long term reliability is still questionable.

Merc A200T is CVT 193bhp/280Nm torque and does 0-100km/h in 7.3 sec. That is not slow. Surely their E and S class can use also but don't know why. My guess is the Bell housing for the transmission. A/B class engines are new design. They are not the same blcok as the C/E/S which dates back 20 years in the making.

Nissan 3.5L engines are at times coupled with CVT also.

The design of CVT is supposed to be very efficient.

#8

Posted 14 January 2009 - 11:12 AM

Watwheels
  • Premium member
    Watwheels
    2Fast2Furious
    The points of the user determines the rank. The higher the points, the higher the rank.
    The bar represents the rank and points of the user. The longer the bar, the higher the rank and points.
     
    Points:
    Points are accumulated from other users who Praise or Disliked this users' posts.
    22,170
      Joined: 21 May 2006
      Posts: 18,569
     

CVT long term reliability is still questionable.

Merc A200T is CVT 193bhp/280Nm torque and does 0-100km/h in 7.3 sec. That is not slow. Surely their E and S class can use also but don't know why. My guess is the Bell housing for the transmission. A/B class engines are new design. They are not the same blcok as the C/E/S which dates back 20 years in the making.

Nissan 3.5L engines are at times coupled with CVT also.

The design of CVT is supposed to be very efficient.


On the contrary CVT is very reliable. Problem is that the power delivery is "too smooth" that you hardly feel the power coming from the engine.

Taken from wiki
en.wikipedia.org/wiki/Continuously_variable_transmission#History

Advantages

* CVTs can compensate for changing vehicle speeds, allowing the engine speed to remain at its level of peak efficiency. This improves fuel economy and by effect, exhaust emissions.

* CVTs operate smoothly since there are no gear changes which cause sudden jerks.

* Very few problems have been reported with the CVT transmission, lowering the cost of ownership.[citation needed]

* There are 25% fewer moving parts to a CVT transmission.[citation needed]

* They are also cheaper, but still expensive to repair.[citation needed]

* The fluids do not have to be changed as often as in an automatic transmission.[citation needed]

Disadvantages

* CVTs operate smoothly and efficiently, without spending energy to jerk the car during a shift. This can give a perception of low power, because many drivers expect a jerk when they begin to move the vehicle. However, the expected jerk of a non-CVT can be emulated by CVT control software, thus eliminating this marketing problem.[citation needed]

* Since the CVT keeps the engine turning at constant RPM over a wide range of vehicle speeds, pressing on the accelerator pedal will make the car move faster but doesn't change the sound coming from the engine as much as a conventional automatic transmission gear-shift. This confuses some drivers and, again, leads to an impression of a lack of power. This can be considered a disadvantage if the driver desires to hear the engine change tone.

* CVT torque-handling capability is limited by the strength of their transmission medium (usually a belt or chain), and by their ability to withstand friction wear between torque source and transmission medium (in friction-driven CVTs). CVTs in production prior to 2005 are predominantly belt- or chain-driven and therefore typically limited to low-powered cars and other light-duty applications. Units using advanced lubricants, however, have been proven to support any amount of torque in production vehicles, including that used for buses, heavy trucks, and earth-moving equipment.

Edited by Watwheels, 14 January 2009 - 11:16 AM.

Driving an unker mid-size MPV now :(

Upside: It churns out 258Nm of Torque :) ....up from 200Nm :p


#9

Posted 14 January 2009 - 11:34 AM

Meowmeow9211
  • Meowmeow9211
    Neutral Newbie
    The points of the user determines the rank. The higher the points, the higher the rank.
    The bar represents the rank and points of the user. The longer the bar, the higher the rank and points.
     
    Points:
    Points are accumulated from other users who Praise or Disliked this users' posts.
    1
      Joined: 06 September 2007
      Posts: 1
     

I used own a 1998 Honda Civic using the CTV liked it was mentioned "Main killer of CVT is torque, not horsepower" thumbsup.gif . Honda is well known for it's powerful engines but when my 98 civic combined with the CVT it made the car runs a bit liked rubber bent effects thumbsdown.gif . On a few occasions when moving out from a stand still out at Singapore and Malaysia small roads to the main road situations. Most of times I couldn't speed up in time becaused of this rubberish effect thumbsdown.gif . The car enigine is roaring but the car just wasn't moving along with the roaring sound of the engine. That was when I was using the 'Normal' mode for normal driving imagine if I were to use the "Economic" mode (which the pick up speed would be worst) bigcry.gif , I will don't know kenan bang how many time liao from behind. If I were to use the "Sport" mode, the fuel needle will drop liked 1/4 from my place in the East to the city, thus still considering CTV low F.C laugh.gif ? The CTV is really super smooth when it is "so-called" changing it's "Gears" thumbsup.gif but it is at some real situation where you need instant power that this CVT in smaller C.C cars don't meet the expectation for the general drivers. From then my next few cars down the years, I tried to avoid using CTV anymore.

These are just my personel feeling about my 1998 Honda Civic which was using the CTV back then. laugh.gif


#10

Posted 14 January 2009 - 11:42 AM

Akula
  • Premium member
    Akula
    5th Gear
    The points of the user determines the rank. The higher the points, the higher the rank.
    The bar represents the rank and points of the user. The longer the bar, the higher the rank and points.
     
    Points:
    Points are accumulated from other users who Praise or Disliked this users' posts.
    2,435
      Joined: 01 August 2007
      Posts: 1,924
     
Used to have all the std perception of CVTs, but after driving friend's Estima and missus's Vellfire find that its very efficient w/o the laggy effect.
Cruising at 90kmh is around 1700rpm. Very quiet. stepping a little more will have the rpm going up to abt 2000+.
Think a modern CVT have mostly eradicated the few weaknesses.
Example of good CVTs can be found in, Nissan, Audi, Toyota, Mercedes etc.....

#11

Posted 14 January 2009 - 12:42 PM

Shull
  • Premium member
    Shull
    2Fast2Furious
    The points of the user determines the rank. The higher the points, the higher the rank.
    The bar represents the rank and points of the user. The longer the bar, the higher the rank and points.
     
    Points:
    Points are accumulated from other users who Praise or Disliked this users' posts.
    22,136
      Joined: 19 January 2006
      Posts: 21,294
     
my civic ES8..1.5L VTEC engine mated to CVT tranny..crusing on NSH 140kmh..

FC wise, 50:50 highway:normal, i can get min 13km/l on normal driving pattern..

reliability? 7yrs car liao..no prob with the tranny.. thumbsup.gif

2002 Honda Civic ES8 (2003-2013) | 2009 Honda Civic FD2 (2009 - present) | 2007 Mitsubishi Lancer CS3 (2013 - present)

Visit my travel blog at http://almostafreque...er.blogspot.com


#12

Posted 14 January 2009 - 12:49 PM

Enduro25
  • Premium member
    Enduro25
    3rd Gear
    The points of the user determines the rank. The higher the points, the higher the rank.
    The bar represents the rank and points of the user. The longer the bar, the higher the rank and points.
     
    Points:
    Points are accumulated from other users who Praise or Disliked this users' posts.
    431
      Joined: 27 August 2006
      Posts: 431
     
for my opinion ,i now driving an auto DOHC(no cvt) and compared to auto with CVT..there is a pro and cons..without CVT u can notice tat ur pick up can react faster than CVT,CVT is gd when u drive ur car at crusing spd..but in terms of FC,i believe tat car wif CVT obtain gd FC as compared to those w/o CVT

#13

Posted 14 January 2009 - 12:58 PM

Kxbc
  • Kxbc
    Supercharged
    The points of the user determines the rank. The higher the points, the higher the rank.
    The bar represents the rank and points of the user. The longer the bar, the higher the rank and points.
     
    Points:
    Points are accumulated from other users who Praise or Disliked this users' posts.
    5,538
      Joined: 30 July 2006
      Posts: 5,286
     

Cruising at 90kmh is around 1700rpm. Very quiet. stepping a little more will have the rpm going up to abt 2000+.

That's quite true. My RPM seldom more than 2k, can count on one hand. It's usually in the region of 1.5k for normal city driving and 2k for HW driving 90km/hr.

Oh, I also using a CVT transmission but car not torquey.


#14

Posted 14 January 2009 - 01:00 PM

DarkLord
  • DarkLord
    2Fast2Furious
    The points of the user determines the rank. The higher the points, the higher the rank.
    The bar represents the rank and points of the user. The longer the bar, the higher the rank and points.
     
    Points:
    Points are accumulated from other users who Praise or Disliked this users' posts.
    33,083
      Joined: 21 April 2004
      Posts: 33,079
     

my civic ES8..1.5L VTEC engine mated to CVT tranny..crusing on NSH 140kmh..

FC wise, 50:50 highway:normal, i can get min 13km/l on normal driving pattern..

reliability? 7yrs car liao..no prob with the tranny.. thumbsup.gif


Mine 1.5L MIVEC engine mated to CVT.. Cruising at 120km/H at 2000rpm. FC less than 10km/L. This CVT has been proven to take up to more than 400nm torque without problems.
Greatest mod of my life part 3 coming soon!

#15

Posted 14 January 2009 - 01:03 PM

Kelpie
  • Kelpie
    NOS-ed
    The points of the user determines the rank. The higher the points, the higher the rank.
    The bar represents the rank and points of the user. The longer the bar, the higher the rank and points.
     
    Points:
    Points are accumulated from other users who Praise or Disliked this users' posts.
    10,083
      Joined: 22 November 2003
      Posts: 13,424
     

Having read many postings from forumers that vehicles with CVT transmission have the perception of being slow in pick-up such as the Mirsubishi Lancer, I came across an article on CVT and wish to share some light with forumers.

What is CVT?

CVT (Continuous Variable Transmission) provides the driver with more power, better fuel economy and a smoother driving experience when compared to a traditional automatic transmission. No wonder many car manufacturers like Nissan and Honda are replacing their vehicles’ automatic transmission with the CVT.


How old is this articule? Honda is not known for CVT. How many CVT you can find in Honda current line up? Probably none.

Regards,
Disclaimer:
The above comments are solely my perspectives. You may disagree with it for I shall not be liable for whatever I may have input. You may feel displeased which in this case, my sincere apologies and do kindly seek moderator's advice if need be. Any obscene & threatening comments on me is a reflection of your personality. My motto is we agree to disagree. No profanity or obscenities of any kind. No personal attacks on other users. Thank you.

#16

Posted 14 January 2009 - 01:06 PM

Triston77
  • Triston77
    1st Gear
    The points of the user determines the rank. The higher the points, the higher the rank.
    The bar represents the rank and points of the user. The longer the bar, the higher the rank and points.
     
    Points:
    Points are accumulated from other users who Praise or Disliked this users' posts.
    74
      Joined: 10 September 2003
      Posts: 74
     

my civic ES8..1.5L VTEC engine mated to CVT tranny..crusing on NSH 140kmh..

FC wise, 50:50 highway:normal, i can get min 13km/l on normal driving pattern..

reliability? 7yrs car liao..no prob with the tranny.. thumbsup.gif


you are one lucky guy. thumbsup.gif in the 4 years that i had my ES8...i think i've changed the starter clutch at least 3 times. sweatdrop.gif

finally gave up and sold the car off. no more CVTs for me until the technology has really been tested and proven..or..when car makers face out traditional gearboxes.

correct me if i'm wrong...but if CVT gearboxes are really that great, shouldn't we see carmakers moving in that direction? instead of coming up with DSG..PDK and whatever with more gear ratios?

#17

Posted 14 January 2009 - 01:11 PM

Kelpie
  • Kelpie
    NOS-ed
    The points of the user determines the rank. The higher the points, the higher the rank.
    The bar represents the rank and points of the user. The longer the bar, the higher the rank and points.
     
    Points:
    Points are accumulated from other users who Praise or Disliked this users' posts.
    10,083
      Joined: 22 November 2003
      Posts: 13,424
     

you are one lucky guy. thumbsup.gif in the 4 years that i had my ES8...i think i've changed the starter clutch at least 3 times. sweatdrop.gif

finally gave up and sold the car off. no more CVTs for me until the technology has really been tested and proven..or..when car makers face out traditional gearboxes.

correct me if i'm wrong...but if CVT gearboxes are really that great, shouldn't we see carmakers moving in that direction? instead of coming up with DSG..PDK and whatever with more gear ratios?


I think only Nissan is the faithful follower of CVT. I once read from a magazine that they are slow into Hybrid engine among their peers becase they felt that CVT is a more fuel economical approach in reducing fuel consumption. Hybrid costs more to build and through the manufacturing process emits more waste. Theortically, CVT is a great concept but is mostly applied to bread and butter cars with the emphasis on comfort.

Regards,

Regards,
Disclaimer:
The above comments are solely my perspectives. You may disagree with it for I shall not be liable for whatever I may have input. You may feel displeased which in this case, my sincere apologies and do kindly seek moderator's advice if need be. Any obscene & threatening comments on me is a reflection of your personality. My motto is we agree to disagree. No profanity or obscenities of any kind. No personal attacks on other users. Thank you.

#18

Posted 14 January 2009 - 01:41 PM

Yuan
  • Premium member
    Yuan
    2Fast2Furious
    The points of the user determines the rank. The higher the points, the higher the rank.
    The bar represents the rank and points of the user. The longer the bar, the higher the rank and points.
     
    Points:
    Points are accumulated from other users who Praise or Disliked this users' posts.
    23,845
      Joined: 12 December 2006
      Posts: 23,589
     
I am driving one with CVT. Honestly, I don't find the pick up slow. Or maybe I am a slow driver. lipsrsealed.gif

I would not floor my accelerator or depress hard to move fast or increase speed. I just depress and let go and then depgress on the accelerator pedal again.
|Genuine Volkswagen (VW) Specifications-Parts-Products|VAG RennTech Intel Modul|Akebono-Ferodo DS2500 Brake Pads|3M Crystalline Solar Film|Sachs Race Engineering (SRE) Kit|Gunson G4107 Start Check Battery Tester|

#19

Posted 14 January 2009 - 01:46 PM

Blindlove
  • Blindlove
    1st Gear
    The points of the user determines the rank. The higher the points, the higher the rank.
    The bar represents the rank and points of the user. The longer the bar, the higher the rank and points.
     
    Points:
    Points are accumulated from other users who Praise or Disliked this users' posts.
    82
      Joined: 14 January 2009
      Posts: 82
     
does the new city with CVT ?
i love kaspersky antivirus . Is save my future . i got it yesterday with low price

#20

Posted 14 January 2009 - 01:57 PM

Fcw75
  • Fcw75
    NOS-ed
    The points of the user determines the rank. The higher the points, the higher the rank.
    The bar represents the rank and points of the user. The longer the bar, the higher the rank and points.
     
    Points:
    Points are accumulated from other users who Praise or Disliked this users' posts.
    13,225
      Joined: 25 December 2002
      Posts: 11,352
     
For me, I will never get one with CVT anymore. Used to own a Jazz CVT. The start-up clutch was gone in 3 years, luckily managed to claim under warranty otherwise it will costs $1000+ outside to replace. When it's gone, you will feel the whole car is juddering. CVT cannot do hard acceleration otherwise the clutch wear out faster.


Back to General Car Discussion  ·  Cars Top
SgCarMart Quotz





0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users