Saw this in my SAE automotive technology eNewsletter today and thought folks would be interested in more details.

https://www.sae.org/news/2020/06/mercedes-amg-eturbo

Will require a 48 V electrical system and uses 2.2 kW of power (which if I worked out correctly is a current of 45.8 A).

Can also recover electrical energy and return it to the battery when exhaust energy is in excess.

 

Having read the article and understanding only some of it, how much different is this than the current setup in the E53 with the M256?

 

Sorry, I have an E63 and haven't really looked into how the E53 works.

Others may be able to advise though.

 

Pretty different. Both use 48V Li-Ion power source to provide torque fill, both use integrated starter generators.

E53 uses a separate component in an electric centrifugal supercharger to add torque down low and a traditional turbo up top....

This solution integrates an electric motor assembly on the turbo shaft to supplement when exhaust pressure is too low to spool the turbo. Think old school turbo size with monumental top end (spools at 3500, mountain of torque, goes to 7k), with the spool characteristics of a daily driver turbo (i.e 1500 spool, dead by 5500)

best of both worlds

 

At 5500 rpm it is just choked off by the small exhaust housing restricting exhaust flow creating back pressure which also leads to tuning issues due to valve timing overlap and detonation..
On my old Lotus I did a compound charge setup [supercharger-large turbo] the supercharger at low RPM produced enough high pressure exhaust flow to instantly spool the large turbo. 36 psi. at 2,800 rpm.
The only downside with a compound setup is the parasitic loss needed to spin the supercharger. At 8,000 rpm the supercharger took 45 ft lbs of engine torque to spin..

I'm pretty sure if there were room to fit a positive displacement roots style supercharger the added weight would be less than the batteries added and reduce a great deal of complication in the system...

ZERO Lag

VW and Volvo have used compound setups on some of their small displacement engines.

 

Bring on all the F1 technology as possible..............just keep the V8..............I know, I know.......F1 runs V6 engines; I'm sentimental.