Go Back   EcoModder Forum > EcoModding > EcoModding Central
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 01-23-2009, 03:52 AM   #1 (permalink)
EcoModding Lurker
 
Join Date: Jan 2009
Location: Olympia
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
replace an automatic transmission with a CVT?

I have searched all over the internet for any information on this.

I have a 2002 Buick Century and I love the car, great mileage with no mods, yet. The transmission is beginning to give me problems after 70,000 miles and I am wondering, since I will probably need to work on it anyway, if it is possible to replace my 4 speed automatic transmission with a continuously variable transmission.

I can't see any reason this could not be done, granted it might be a lot of work, and if I need to fix the car anyway I would like to eek out any possible efficiency I can.

There also doesn't seem to be any downside to a CVT either, but, then again, I don't know much about this stuff.

The plusses seem the be better efficiency and fewer moving parts. CVTs just seem like the better of the two designs.

I'd really like to do this, can anyone tell me why it could or could not be done?

thanks

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 01-23-2009, 07:20 AM   #2 (permalink)
Master EcoModder
 
The Atomic Ass's Avatar
 
Join Date: Oct 2008
Location: Mason, OH
Posts: 532

Priinocchio - '17 Toyota Prius Two Eco
90 day: 62.03 mpg (US)
Thanks: 11
Thanked 18 Times in 15 Posts
CVT's actually have a lot more drag than conventional manuals or autos. They make up for it by keeping the engine in such a tight range during acceleration. They suck in the winter due to the effect of temperature on the belt. Makes the engine rev way too high just to get moving.

But it can be done. Your main problem is going to be FINDING a transmission. There aren't very many of them made. And none will probably be a direct swap.
__________________
  Reply With Quote
Old 01-23-2009, 08:26 AM   #3 (permalink)
MPG...what?
 
Join Date: Jan 2008
Location: Finksburg, MD
Posts: 145

Terkle - '97 Toyota Tercel Whitehawk
90 day: 40.91 mpg (US)

Bubble - '10 Toyota Yaris base
90 day: 41.88 mpg (US)

Deva - '13 Chevrolet Spark LS
90 day: 39.82 mpg (US)

Malibu5 - '82 Chevrolet Malibu Classic
90 day: 17.61 mpg (US)

Highlander - '06 Toyota Highlander Limited
90 day: 21.24 mpg (US)
Thanks: 8
Thanked 2 Times in 2 Posts
Send a message via AIM to malibuguy
Quote:
Originally Posted by The Atomic Ass View Post
CVT's actually have a lot more drag than conventional manuals or autos. They make up for it by keeping the engine in such a tight range during acceleration. They suck in the winter due to the effect of temperature on the belt. Makes the engine rev way too high just to get moving.

But it can be done. Your main problem is going to be FINDING a transmission. There aren't very many of them made. And none will probably be a direct swap.
yep, the Caliber until it warmed up, in the winter months, it sang much more RPM then needed for the first 3-5miles, highly annoying, i stopped logging the mileage on here, but still kept track, went from a best of 34mpg with the a/c on in the summer, to 28 in the winter...blach...& that was before it got really cold, cuz then i fixed my Tercel & have been driving it

but the CVT is neat & pretty effecient way of accelerating after it gets up in the power band, but it sucks right off the line, 2.7X 60-foot times, twas pathetic, but i did get 16.9s out of it @ 83mph with a 15mph headwind, not bad for pretty much stock, 2.0L 158HP & 3300lbs +/- with me in it
__________________
-Greg...the exhaust freak.

-06 Highlander 3.3awd
-10 Yaris sedan
-97 Tercel, 1NZfe swapped
-96 Tercel
-82 Malibu 1UZfe swapped
-19 Fit (wifey ride)



www.pipedreamsfab.com
  Reply With Quote
Old 01-23-2009, 10:09 AM   #4 (permalink)
Hypermiler
 
PaleMelanesian's Avatar
 
Join Date: Dec 2007
Location: Texas
Posts: 2,316

PaleCivic (retired) - '96 Honda Civic DX Sedan
90 day: 69.2 mpg (US)

PaleFit - '09 Honda Fit Sport
Team Honda
Wagons
90 day: 44.06 mpg (US)
Thanks: 607
Thanked 424 Times in 277 Posts
I wouldn't do it. That GM transmission is one of the best in the business for mileage. It keeps the engine in a good low rpm range with little fuss. It unlocks and freewheels when you let off the gas, so you don't really need to shift into neutral for coasting. Your best bet would be to repair / replace with the same.
__________________



11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
  Reply With Quote
Old 01-23-2009, 12:30 PM   #5 (permalink)
EcoModding Lurker
 
Join Date: Jan 2009
Location: Olympia
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by PaleMelanesian View Post
I wouldn't do it. That GM transmission is one of the best in the business for mileage. It keeps the engine in a good low rpm range with little fuss. It unlocks and freewheels when you let off the gas, so you don't really need to shift into neutral for coasting. Your best bet would be to repair / replace with the same.
This is really great to hear. I keep hearing good things about this car. Now I guess I just have to get it fixed.
  Reply With Quote
Old 01-23-2009, 01:51 PM   #6 (permalink)
(:
 
Frank Lee's Avatar
 
Join Date: Jan 2008
Location: up north
Posts: 12,755

Blue - '93 Ford Tempo
Last 3: 27.29 mpg (US)

F150 - '94 Ford F150 XLT 4x4
90 day: 18.5 mpg (US)

Sport Coupe - '92 Ford Tempo GL
Last 3: 69.62 mpg (US)

ShWing! - '82 honda gold wing Interstate
90 day: 33.65 mpg (US)

Moon Unit - '98 Mercury Sable LX Wagon
90 day: 21.24 mpg (US)
Thanks: 1,582
Thanked 3,541 Times in 2,211 Posts
^What Pale said. And, to really realize the benefits of CVT I'd imagine the engine would need to be re-cammed and re-programmed to operate more efficiently in a small rpm range.
__________________


  Reply With Quote
Old 01-24-2009, 04:02 PM   #7 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 12,453
Thanks: 20,018
Thanked 6,221 Times in 3,841 Posts
Cvt

I'm going to chime in with the "don't do it camp." I waited with high expectations with the Subaru Justy and it's CVT.The car was a complete disappointment,delivering only mediocre mpg performance,with much less "performance" than conventionally-geared cars of it's class.

__________________
Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Honda Insight - Replace CVT Transmission (with manual) Irons Hybrids 17 05-29-2015 11:05 PM
Solution for coasting an automatic transmission: external oil pump MetroMPG EcoModding Central 19 01-22-2015 01:49 PM
FOR SALE: Automatic Transmission from a 1994 Geo Metro Hatchback plus many more parts Hacksaw For Sale 7 02-03-2012 11:46 AM
CVT Disadvantages DifferentPointofView The Lounge 30 12-08-2008 09:10 PM
Accidental Transmission discovery (bump started my automatic) apgrok1 Hypermiling / EcoDriver's Ed 25 03-10-2008 01:38 PM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com