Manual CVT?
808
02-08-2005, 04:45 PM
Im thinking of modifying a cvt into a manual some how. kill the non-believers, i will. my trade is ground support equipment and i dont know much yet, but will get into the swing of things later.
IMAGINE........ steping on the gas to 7000+ rpms and keeping it there and adding gear ratio at your lesiure. The trouble im having with this is choosing a foriegn or domestic CVT to tamper with, and what vehicle to modify and adding some type of throttle like gear shifter. if you feel mechanically inept to preform a prototype of some sort, please post on this thread on your thoughts.
Yes I will probably break the tranny and im aware of belt slip in pulley driven CVT's
I was thinking of the Ford 500's CVT and modifying the CVT ratio control system. I would love to do a Mini S but that is a foriegn engineering monster of oil preassures and the paddle shifter. what i thought to rip apart was a 2005 civic SI becuase of the interesting center console, and the 160 horse P.
I need tourque specs on light CVT's and lowest to greatest ratios.
The ford 500 has 200 HP and has faster acceleration than any 250 HP in its class. Beating the accura and toyota models respectively.
IMAGINE........ steping on the gas to 7000+ rpms and keeping it there and adding gear ratio at your lesiure. The trouble im having with this is choosing a foriegn or domestic CVT to tamper with, and what vehicle to modify and adding some type of throttle like gear shifter. if you feel mechanically inept to preform a prototype of some sort, please post on this thread on your thoughts.
Yes I will probably break the tranny and im aware of belt slip in pulley driven CVT's
I was thinking of the Ford 500's CVT and modifying the CVT ratio control system. I would love to do a Mini S but that is a foriegn engineering monster of oil preassures and the paddle shifter. what i thought to rip apart was a 2005 civic SI becuase of the interesting center console, and the 160 horse P.
I need tourque specs on light CVT's and lowest to greatest ratios.
The ford 500 has 200 HP and has faster acceleration than any 250 HP in its class. Beating the accura and toyota models respectively.
SaabJohan
02-09-2005, 11:01 AM
There was some experiments with CVT in F1 in the early 90:ties. The gearbox aswell as the engine is of course controlled by microcomputers. Give full thottle and the computer takes the engine to max power while adjusting the gear ratio so a constant engine speed is achieved. That's however not the problem, the problem is to design a CVT which can take the torque and speeds involved without large friction losses and doing this while also being compact and light.
808
02-10-2005, 01:40 PM
Im not in the mood to totally reconfigure a cvt on my own i just want the option of automatic (computer control), and the option to manually slide up and down the entire spectrum w/ a clutch to add even more driving experience.
w/ the clutch engaged, I could shift into and out of 6 or 18 or 30 gear ratios if i wanted to , or down shift into the perfect ratio.
on the other hand in stop and go traffic, use the automatic controlled cvt hardware.
Or like in the racing situation I suggested earlier, keep rpms at max from a dead stop and through the lowest ratio, all the way up to maxed out ratio and speed.(w out pressing the clutch once)
Ill have alot of fun on a dirt track w/ all wheel drive and a tranny configuration like this
Ive already had a lot of good feed back on other car forums about the project. then again, ive got a guy with nice sports cars talking to me like its a waste of time and i would be losing the efficiency of the auto cvt or the acceleration of a regular 4speed auto or the yadda yada gaynessblah....
Im configuring a vehicle to my wants and likings. just like any one else. im on a bugjet, may get stationed in Japan and cant spell.
One guy on a forum mentioned his father or grandfather uses to this day a manual controlled cvt Combine Harvester from the sixties or seventies. DANM! ITS OUT THERE!, BUT NOT IN MY CAR!
w/ the clutch engaged, I could shift into and out of 6 or 18 or 30 gear ratios if i wanted to , or down shift into the perfect ratio.
on the other hand in stop and go traffic, use the automatic controlled cvt hardware.
Or like in the racing situation I suggested earlier, keep rpms at max from a dead stop and through the lowest ratio, all the way up to maxed out ratio and speed.(w out pressing the clutch once)
Ill have alot of fun on a dirt track w/ all wheel drive and a tranny configuration like this
Ive already had a lot of good feed back on other car forums about the project. then again, ive got a guy with nice sports cars talking to me like its a waste of time and i would be losing the efficiency of the auto cvt or the acceleration of a regular 4speed auto or the yadda yada gaynessblah....
Im configuring a vehicle to my wants and likings. just like any one else. im on a bugjet, may get stationed in Japan and cant spell.
One guy on a forum mentioned his father or grandfather uses to this day a manual controlled cvt Combine Harvester from the sixties or seventies. DANM! ITS OUT THERE!, BUT NOT IN MY CAR!
SaabJohan
02-10-2005, 04:41 PM
There is no point of controlling a CVT manually.
There is also a risk of long term engine damage caused by constant engine speed.
There is also a risk of long term engine damage caused by constant engine speed.
808
02-10-2005, 07:27 PM
what the hell?
I know that and i will keep the safety hardware and devises but tweek them a bit.
Who the hell will keep their car at 7000+ rpms? Constant engine speed? you meen like highway travel at like 1500 rpms for hours on end?
"specify"
Im saying it would be possible. and with the option of automatic, it saves gas when cruizing. go ahead and test drive a ford 500. the high rpms are maintained for alot longer period of time than a 4 speed A, when pushing it. Then rpms settle for max efficiency.
and the "point" is to have more control of what the car does. and to most of the people ive talked to on other forums, they love the idea and the challenge the tranny puts on the "driver". On a more selfish term, The point is to satisfy my wants and desires. Some people love simplicity (and or) hate the commute to work or something. I love to drive and will drive almost anything, any where, under any condition.
I know that and i will keep the safety hardware and devises but tweek them a bit.
Who the hell will keep their car at 7000+ rpms? Constant engine speed? you meen like highway travel at like 1500 rpms for hours on end?
"specify"
Im saying it would be possible. and with the option of automatic, it saves gas when cruizing. go ahead and test drive a ford 500. the high rpms are maintained for alot longer period of time than a 4 speed A, when pushing it. Then rpms settle for max efficiency.
and the "point" is to have more control of what the car does. and to most of the people ive talked to on other forums, they love the idea and the challenge the tranny puts on the "driver". On a more selfish term, The point is to satisfy my wants and desires. Some people love simplicity (and or) hate the commute to work or something. I love to drive and will drive almost anything, any where, under any condition.
Kurtdg19
02-10-2005, 09:16 PM
There already is a CVT with a manual override. Nissan makes one (in company with Subie). Do a little bit of research on this and I'm sure you will be able to find more info. Try typing in the words "Nissan M6 Hyper-CVT" in a google type search.
With that aside, another CVT type transmission is currently in some Audi's. Audi calls it the Multitronic CVT. Instead of belts used on traditional CVT, the Multitronic uses a steel chain which consist of many link plates and pins that can handle up to 220ft. lbs of torque, far exceeding any belt driven type. The steel chain (plus a torque sensor) neglects the "rubber band" effect from the belt systems, which allow correspondance to increased driving speeds with increased rev's.....no "catching up" like the conventional CVTs. Audi has actually claimed better performance tagged with better economy with the Multitronic vs. their 5 speed.
If you would like to explore even further, you will eventually indulge into Nissan's Extroid CVT. Quite different from any other.
With that aside, another CVT type transmission is currently in some Audi's. Audi calls it the Multitronic CVT. Instead of belts used on traditional CVT, the Multitronic uses a steel chain which consist of many link plates and pins that can handle up to 220ft. lbs of torque, far exceeding any belt driven type. The steel chain (plus a torque sensor) neglects the "rubber band" effect from the belt systems, which allow correspondance to increased driving speeds with increased rev's.....no "catching up" like the conventional CVTs. Audi has actually claimed better performance tagged with better economy with the Multitronic vs. their 5 speed.
If you would like to explore even further, you will eventually indulge into Nissan's Extroid CVT. Quite different from any other.
SaabJohan
02-11-2005, 10:34 AM
With constant engine speed there is always a risk of damage caused by oscillation if the engine speed is near a critical speed.
The manual gearbox is used because it can allow better performance than an automatic. With a CVT that will no longer be the case, a computer will do the work best. Also, for the best performance the idea is to make it as simple for the driver as possible. It's like with airplanes, the pilot flies the computer and the computer flies the plane.
With a computer controlled CVT and engine you basicly setup the system for max load at low engine speed for constant speed driving, for max acceleration you go for maximum power and in between you will have to use a mix of the two.
The manual gearbox is used because it can allow better performance than an automatic. With a CVT that will no longer be the case, a computer will do the work best. Also, for the best performance the idea is to make it as simple for the driver as possible. It's like with airplanes, the pilot flies the computer and the computer flies the plane.
With a computer controlled CVT and engine you basicly setup the system for max load at low engine speed for constant speed driving, for max acceleration you go for maximum power and in between you will have to use a mix of the two.
808
02-11-2005, 12:24 PM
I see that know one understands me here in this forum. I know that the cvt's in some fun to drive cars include triptronic siesmonic. Basically, a sport shift or paddles. Id rather buy a manual instead of a cvt with predestined bandwithds. this tranny could allow the driver a bandwithd when/where ever he/she wants along the ratio spectrum. and i know most manuals offer better preformance than most automatics ( because a human can nessesitate change to machinary depending on the situation). some cvt are really climbing up and offer the best for the economics, driver and engine.
SSSooooo...
A cvt that i can CONTROL my self is something that may bring a bit of joy to my life. To make the vehicle a part of me or a complex extention of me. Im the kind of guy to drive in reverse for hours, or shift with no problems whatso ever with out a clutch (except for 1rst to get the car going from a standstill). The throttle type shifter will take constant attention, makeing driving more challenging. Another reason drivers/mechanics like my idea.
my home has too many feet of elevation to climb, too many miles of stright-a-ways and too many turns, ect.
I just want to have a different experience for a change.
Go here if you want to see what others think and my "credentials".
www.car-forums.com and look up CVT or my Forum name 808state.
Thanx to the info. sites, Nissan's M6 Hyper CVT would be nice to modify.
SSSooooo...
A cvt that i can CONTROL my self is something that may bring a bit of joy to my life. To make the vehicle a part of me or a complex extention of me. Im the kind of guy to drive in reverse for hours, or shift with no problems whatso ever with out a clutch (except for 1rst to get the car going from a standstill). The throttle type shifter will take constant attention, makeing driving more challenging. Another reason drivers/mechanics like my idea.
my home has too many feet of elevation to climb, too many miles of stright-a-ways and too many turns, ect.
I just want to have a different experience for a change.
Go here if you want to see what others think and my "credentials".
www.car-forums.com and look up CVT or my Forum name 808state.
Thanx to the info. sites, Nissan's M6 Hyper CVT would be nice to modify.
808
03-16-2005, 06:05 PM
My idea has taken off and im aquiring a patent,
other websites to follow along;
eng-tips.com
car-forums.com
other websites to follow along;
eng-tips.com
car-forums.com
Automotive Network, Inc., Copyright ©2026
