[NISFAN]

Originally Posted by Boss330

The LaFerrari, Mclaren P1 and Porsche 918 all use hybrid technology to add power. How far BMW has taken the hybrid tech on the next gen M3/M4 will be interesting to see.

And a hybrid/electric turbo can accelerate from 40,000 to 120,000 rpm in less than 450 ms. This rate of acceleration eliminates the turbo lag which is a major limiting factor on the performance of standard turbocharged engines.

http://en.wikipedia.org/wiki/Hybrid_turbocharger

From an article on BMW's electric turbo patents:



http://jalopnik.com/5855317/will-bmw...-end-turbo-lag

Borg Warners eBooster:



http://www.3k-warner.de/products/eBooster.aspx

Bowman electric turbos for trucks:

http://www.bowmanpower.com/technolog...turbochargers/

Turbos with a electric generator/motor unit makes a lot of sense to me

Interesting that Honeywell Garrett, the worlds largest Turbo manufacturer came out with an electric assist patent and prototypes probably about a decade ago, yet have not gone any further with it......why do you think that is?

The other thing that makes me chuckle in your wiki link, is the whole reason for using turbo chargers in the first place is to use the efficiency of the low or unboosted state where the engine uses significantly less fuel. To add a device that artificially maintains boost, is surely defeating the object? May as well stay with a larger NA.

The biggest factor in Turbo lag is the inertia of the entire turbine unit. Hence the reason for using smaller turbo's to overcome the inertia issue. Also why some manufacturers use ceramic turbine blades instead of metallic ones, again to reduce weight of rotating mass and lower inertia....

....so someone thinks it is a good idea to add clutches and gearboxes to turbines significantly increasing inertia all to reduce lag? Doesn't take a rocket scientist to how anti productive that thinking is.

My guess is all this is more focussed on harvesting the 'wasted' energy than reducing lag.