Rear Mount Hydraulic Turbo?

[serialk11r]

Originally Posted by stugray

http://www.cpowert.com/Products/TIGERS

That's an electric turbine without the compressor side. At full throttle on a naturally aspirated engine there is ~7% or so (depending on the engine) extra power to be picked up by placing a turbine in the exhaust, but at less than full load it will be pretty much dead-weight.

That said, essentially what this turbine picks up is the sound energy coming from the blowdown at each exhaust. It would provide a muffling effect to the exhaust so if it allows you to shed resonators and mufflers while providing a small bit of power, that's a win-win. Unfortunately, that doesn't seem like it could ever be very cost effective lol.

Most of the energy going out the tailpipe is in the form of waste heat. You have to use a heat exchanger of some sort to capture this waste heat because if you try to convert it to pressure to drive a turbine, that pressure will be pushing back on the engine. Notice how that TIGERS thing produces 2kW maximum. BMW's "Turbosteamer" concept produces 10kW peak and well over 2kW in regular driving. Extremely inefficient low temperature thermoelectric generators hooked up to the exhaust will be giving you a constant 300W while barely using much of the heat from the exhaust at all. Experimental high efficiency, high temperature TEGs could provide way more power than a modern car's electrical systems could ever use for free from exhaust gas.

[fang_gt86]

Originally Posted by pushrod

The hydraulic fluid is going to get stupidly hot. I think that would be the hardest thing to solve: finding a fluid that can live in that environment.

Some of the industrial hydraulic oil have a tolerance of 225F. I'm pretty sure that turbine will get 3X as hot.

[navanodd]

Assuming you could size the stuff so that the friction in the fluid was small, you'd end up with a pretty big turbo lag problem.


A normal turbo only has to accelerate the turbine and compressor, this would have to do that plus accelerate all the fluid in those lines. That would be a pretty significant mass.

[Reaper]

I realize this is all for fun so I'll keep my negative comments short and entertaining.

Toyota tried a hydroloc driven radiator fan in the early 90s lexus sc400. The 1uzfe engine had an internal pump that ran lines to a hydrolic fan for the radiator. Terrible idea. Some people turn it into a power steering pump and delete everything else.

Electric assist turbos are the future.

The end.

[stugray]

Here's the ticket:
http://www.enginebuildermag.com/2014...er-technology/