CVT Transmissions

Fox Body · 11-12-2003, 10:56 PM

Hey, what do you guys think about the CVTs (constantly variable transmissions)? No clutches, smooth pull with no shifting, lighter weight. Think they'll ever find their way into any muscle cars?

QuantumMotorsports · 11-12-2003, 11:12 PM

Sure hope they can make them strong enough. Imagine your engine sitting at peak HP and your car accelerating like a rocket! You know, if the HP loss due to friction through the tranny was the same as an automatic, you could probably drop a second or more just because the HP is constant for the whole length of track. It'd be kinda like the top fuel dragsters except they just have a clutch that is designed to slip and slowly engage more and more as the wheel RPM increases. I think I saw an audi or volvo on some TV show that has one of those trannies. It'd be the bomb if it was behind some power.

Rev · 11-13-2003, 10:04 PM

Buicks had a tranny in the '50's that was like that. They used a variable pitch torque convertor and no gears except for reverse. They were very inefficient and were slow compared to the Olds 4 speed Hydramatic. It's claim to fame was that it was smooth with no gear shifts. The only people that liked the Dynaflow were fat old ladies, as I remember.

Rev

QuantumMotorsports · 11-14-2003, 01:50 AM

I believe the new ones work with a system of belts and possibly conical pulley things? Not sure. Maybe it's just a bang load of planetary gears that have some sort of variable slip thing. I'd love to find out though.

Fox Body · 11-14-2003, 12:06 PM

Yeah, it's pretty much just fixed pullies, variable pullies, and belts. I don't know how durable those would be either on a relatively high-powered car. I guess they wouldn't do so bad an a low powered economy car...

But yeah, man, think about a constant pull the entire way through the 1/4. That is like rocket power.

11-12-2003, 10:56 PM	#1
Fox Body Mustang Maniac Join Date: Sep 2000 Location: GA, U.S.A Posts: 2,266	CVT Transmissions Hey, what do you guys think about the CVTs (constantly variable transmissions)? No clutches, smooth pull with no shifting, lighter weight. Think they'll ever find their way into any muscle cars? __________________ 351W-powered 1979 Ford Mustang Ghia notchback '79 Video @ Idle Stock 5.8L under 4" cowl 'glass hood, C4 w/ Transgo shift kit, Holley 750 cfm, Edelbrock Performer RPM intake; Fluidyne Al radiator, Flexalite 175 electric fan, 1 5/8" MAC shorty headers, FRPP Al driveshaft; S&W 6-point cage; 2.5" Off road H-pipe, 2-chamber Flowmasters, 8.8" Rear w/ 3.55s; Weld wheels (15x6;15x8), Front: 225/60/15, Rear: 275/50/15 Nitto NT 555R Drag Radials; 14 x 4” K&N X-stream air filter. '92 GT (5-speed) Small In Car Video Stock 5.0L, 2-chamber Flowmasters, MAC CAI, Tri-Ax, Al pedals... "Red, thou art my companion. Hasten now your quickened metamorphosis to Green that I may conquer all who dare abide there beside me. May they be left thither behind burnt black." ---Fox Body

11-12-2003, 11:12 PM	#2
QuantumMotorsports Registered Member Join Date: Jul 2000 Location: Norman, Oklahoma, USA Posts: 597	Sure hope they can make them strong enough. Imagine your engine sitting at peak HP and your car accelerating like a rocket! You know, if the HP loss due to friction through the tranny was the same as an automatic, you could probably drop a second or more just because the HP is constant for the whole length of track. It'd be kinda like the top fuel dragsters except they just have a clutch that is designed to slip and slowly engage more and more as the wheel RPM increases. I think I saw an audi or volvo on some TV show that has one of those trannies. It'd be the bomb if it was behind some power. __________________ Michael Black QuantumMotorsports Norman, OK 1984 LX Hatch 306 w/ TRW forged flat toppers, Comp Cams Magnum 292H, GT40P heads w/ 3 angle valve job, .550 lift springs, Angus Racing Roller Rockers, Weiand Stealth Intake, Holley 4150 650cfm carb, MAC 1 5/8 Long Tubes, Single Chamber Flowmasters, 91' T5 w/ Pro 5.0 shifter, Turbo Coupe 8.8 Rear w/ 3.55 gears, QA1 Motorsports tubular K member, no interior except steering wheel and seat. Coming soon: 6 or 8 point cage, Fuel Cell, Weld Draglites

11-13-2003, 10:04 PM	#3
Rev Registered Member Join Date: Nov 1998 Location: Houston, Tx. Posts: 3,887	Buick Dynaflow Buicks had a tranny in the '50's that was like that. They used a variable pitch torque convertor and no gears except for reverse. They were very inefficient and were slow compared to the Olds 4 speed Hydramatic. It's claim to fame was that it was smooth with no gear shifts. The only people that liked the Dynaflow were fat old ladies, as I remember. Rev __________________ '66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi. O.B.C. #2 '66 coupe

11-14-2003, 01:50 AM	#4
QuantumMotorsports Registered Member Join Date: Jul 2000 Location: Norman, Oklahoma, USA Posts: 597	I believe the new ones work with a system of belts and possibly conical pulley things? Not sure. Maybe it's just a bang load of planetary gears that have some sort of variable slip thing. I'd love to find out though. __________________ Michael Black QuantumMotorsports Norman, OK 1984 LX Hatch 306 w/ TRW forged flat toppers, Comp Cams Magnum 292H, GT40P heads w/ 3 angle valve job, .550 lift springs, Angus Racing Roller Rockers, Weiand Stealth Intake, Holley 4150 650cfm carb, MAC 1 5/8 Long Tubes, Single Chamber Flowmasters, 91' T5 w/ Pro 5.0 shifter, Turbo Coupe 8.8 Rear w/ 3.55 gears, QA1 Motorsports tubular K member, no interior except steering wheel and seat. Coming soon: 6 or 8 point cage, Fuel Cell, Weld Draglites

11-14-2003, 12:06 PM	#5
Fox Body Mustang Maniac Join Date: Sep 2000 Location: GA, U.S.A Posts: 2,266	Yeah, it's pretty much just fixed pullies, variable pullies, and belts. I don't know how durable those would be either on a relatively high-powered car. I guess they wouldn't do so bad an a low powered economy car... But yeah, man, think about a constant pull the entire way through the 1/4. That is like rocket power. __________________ 351W-powered 1979 Ford Mustang Ghia notchback '79 Video @ Idle Stock 5.8L under 4" cowl 'glass hood, C4 w/ Transgo shift kit, Holley 750 cfm, Edelbrock Performer RPM intake; Fluidyne Al radiator, Flexalite 175 electric fan, 1 5/8" MAC shorty headers, FRPP Al driveshaft; S&W 6-point cage; 2.5" Off road H-pipe, 2-chamber Flowmasters, 8.8" Rear w/ 3.55s; Weld wheels (15x6;15x8), Front: 225/60/15, Rear: 275/50/15 Nitto NT 555R Drag Radials; 14 x 4” K&N X-stream air filter. '92 GT (5-speed) Small In Car Video Stock 5.0L, 2-chamber Flowmasters, MAC CAI, Tri-Ax, Al pedals... "Red, thou art my companion. Hasten now your quickened metamorphosis to Green that I may conquer all who dare abide there beside me. May they be left thither behind burnt black." ---Fox Body

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