The driver and driven forcefully try to change reduction ratios, Those four transition points cause about 20-25% powerloss on an ideal CVT. To the straight path (free air) to the driven and back. That slip happens at the transition from semi circular path round the driver It's the same principle that wear down your tyres eventually. (power turned to heat and belt dust instead of movement) We've had that conversation a while ago because of MrMonks TavKit last year,Īnd that slip is what's causing belt wear and also powerloss Now, that's enough scowering the internet for one 's 2:40 AM.I should go to bed. But at least now I'm not as worried about the durability of these torque converters. At the end of the day I can always compensate for any loss of RPM with gearing to get to my desired balance of speed and torque. It seems that these torque converters can be run not only above their power ratings ( to a point) but also at high RPMs with little issue.
Red Beard's Garage runs 40 series on his built 420s/440s that put out about 30 horsepower and turn 8000 RPM (w/o load) with no issues, and he also ran a 30 series on a Stage 2 Predator 212 which are capable of about 8000 RPM (w/o load).Īll of this considered I imagine I'll be fine running a 780 on a 25-30 horsepower engine at probably around 6000-7000 RPM. They were running that 40 series at almost *3 TIMES* its rated horsepower for quite a while before it crapped out on them.
No idea what gearing they used they only said "short gearing", so I'm guessing they geared it for just about 65-70 MPH. Granted it had about 50 horsepower while I'm probably going to be closer to 25-30 horsepower. They also ran a 40 series (w/ load) on their 50 horsepower 670cc mower that did 65 MPH on 18" tires. Cars and Cameras ran a 780 on their 60 horsepower 670cc drag rail at 6000+ RPM (w/ load) by their estimate. Vasily Builds runs a 780 on a built 670cc that's turning 7000 RPM (w/o load). Let me just say that YouTube is a wonderful thing. I just need to know if the torque converter is capable of it so I figured I'd ask the experts.ĮDIT: Just did a bit more research on this topic, guess I should share for anyone else wondering. End goal is to have something comparable to a Honda Odyssey (The dune buggies not the minivans!). I want to gear as low as possible for more torque, but still want at least a 60 MPH top speed. That's 59.5 MPH in the calculator, and that's not including overdrive from the torque converter. I'm aiming for 60mph w/ 22" tires and a 6.6:1 gear ratio. Built 420s/440s (billet rod/flywheel) can rev up to 8000 RPM under no load according to Red Beard's Garage.
I'm planning to run a 780 torque converter on a built 420/440.