YouTube - Bad Rx7

 

neato. just sucks it didnt really make any more torque after 5000 or so. (guessing that was the rpm, hp/tq cross over at 5252 if the dyno charts increments are equal)

i am kind of dissappointed in the power he made with that turbo though, itll support almost 1000 or more to the wheels, but he was managing to run 25+psi and only making 670.

 

i kept thinking batman was gonna pop out and do a battle when i the intro song was playing



amazing car though id kill for one of these

 

+1 rotaries just aren't built for torque. (which is why they spin the piss out of them)
wonder if it leaks?
and finally, it sounds like my dads old lawn mower, minus the turbo spool.
i'll respectfully pass.

 

well, its hard to say they arent built for torque, horsepower is a derivative of torque, the reason the numbers are so off is that this thing spins to 9.5k so no, torque is not why they spin the piss out of them. horsepower is. this thing makes as much torque as a heads/cam LS1.

hp = (rpm*tq)/5252

tq = (hp*5252)/rpm

lets say it only made 350wtq but at 9500rpm, it still makes 633rwhp. whereas these numbers are dead even at 5252

 

its bad ass hell like it

 

Sorry i was a tad vague in my comments. I meant that they aren't necessarily the *best* or rather one of the better options for high torque applications. And my comment about spinning the piss out of them was based on the fact that, if you get any amount of weight spinning fast enough it's going to have torque.

Like the homemade toy with beer/soda bottle tops with 2 holes and string through it deal (or buttons for the sheltered kids lol) those weigh nothing at all but if you get'em spinning fast enough and try to grab it, they're hard to stop. No different than those things spooling up to some crazy rpm and dumping the clutch when they launch.
High RPM, high HP, and the proper gearing.

Anyhow, I'm not saying you're wrong, i was just clarifying my reasoning for my comments.

 

...your making it sound like the heavier the rotating assembly, the more torque it will have.

torque is created by the energy made during combustion. rotating assemblies are balanced down to just a few grams, or should be anyways. there is no benefit from having an unbalanced/overweight rotating assembly.

what your talking about with the clutch dumping has to do with inertia. its already spinning and your trying to grab hold with the clutch. HP doesnt really play any part in that...a 40hp and a 4000hp engine can both spin 5000rpm with little load. now if there is alot of mass turning at 5000rpm then yes it will get you out with a bit more umph as there is more transference of energy, but the extra rotational mass isnt going to net you better power gains. it will take more power to turn it. usually rotational mass can be given a ratio of ~8:1 in comparison to regular mass (i.e. interior, seats, dash etc). this is why you may notice people gaining/losing up to 1.5-2 tenths in the 1/4 mile just by going to a new rim/tire combination