I'd conjecture that it might get 75mpgUS
That's based on:
At 100km/hr requires 13.25 hp
engine currently runs at 2064 rpm, but could produce the 13.25 hp at 1000rpm, That would be more fuel efficient, so instead of giving 60mpg, you'd get 75mpg.
i'd say that a constant velocity tranny...
a couple things should be considered and before we bring up the fact that this "inventor" is qouting mechanical engineering text from 1938
#1 a hydraulic tranny (CVT type) could keep the motor at 90 hp the whole time... 4 seconds? not a chance... anyone got the equation to determine mass (3000 pounds) and a constant 90 hp (4300 rpms) and accelleration? assume 90 and 95 % efficiency (I know there are engineers here that can do it).... GoFaster!!! TDImeister???
#2 at a steady state the TDI is most efficient at the torque peak: 1900 rpms or so... below that the turbo is ineffective and the motor looses efficiency...
if the engine could be kept at 1900 with a very light load that'd be pretty damn cool...
very damn cool.
Not impossible from what it sounds like with this tranny.
The "inventor" suffers from too many years of marketing and fish stories. Rather than being "realistic" he's being more of an advertising guy than an engineer.
The tranny may have a "place" but what about the CVT that Honda's uses and what about other CVTs...
how's the efficiency compared between a mechanical CVT and a hydrostatic CVT...
okay - and - how much is a unit going to cost?
And everyone knows hydraulic units don't last forever... how about performance in cold vs hot weather?
Fluids have this property that changes with temps... how does a -10 degree F morning/cold start affect it?
Has this ever been put into a vehicle? Can it be adapted to an efficient vehicle? Cost, reliability?
The only think i can see as a benefit is the potential to hold a specific engine RPM across an increasing driveshaft rpm....
But keep in mind the TDI starts filling the intake with junk below 2,000 rpms (meaning don't use the motor with more than 20% throttle or your intake will require cleaning and if you can't do it yourself it'll cost major $$$$)
150-200 MPG? Totally completely impossible
4 sec 0-60 with 90 hp? ditto
75 mpg? Possible
8-10 second 0-60? Possible...
too bad people can't be realistic with their passion...