Audi offers its solution to the decades-old problem of turbo lag with a new engine that features electrically-driven turbocharging. It’s based on the 3.0 litre BiTDI V6 (yes, the diesel that can sing), which has two turbos; only here, one of them’s a bigger, conventional exhaust-driven unit while the other is a smaller, electric motor-driven compressor.
Turbo lag refers to the time lapse between the press of the accelerator pedal and the desired power actually arriving – because turbochargers are driven by exhaust from the engine, a lag occurs when exhaust pressure is not high enough to force the turbine blades to spin and push more air into the engine. Generally, the bigger the turbo, the higher the revs and exhaust pressure required to make it work, and therefore, the bigger the time delay.
Sequential twin-turbo systems help this phenomenon somewhat – a smaller turbo works at low revs, switching to a bigger one at higher revs – but however minimal, there’s still a lag. In this new engine, the electric motor can “accelerate its turbine to very high speeds in an extremely short time.” Audi says the energy used to drive the compressor is mostly replaced by battery regeneration during coasting, so overall efficiency is preserved.
The electrically-driven compressor is placed after the main turbo in the charge air path – most of the time, the charge air is bypassed around the former, but when the main turbo’s energy output drops, a flap in the bypass shuts and the air goes into the electric compressor to be compressed a second time.
Tests have been conducted on prototype units, and the company found that the new system can yield a staggering two car-length lead over a conventional twin-turbodiesel in the first three seconds of acceleration, when fitted to the same car. So boost arrives noticeably earlier.
We don’t know when the engine will go into production, but there is speculation that the next-gen Audi A4 may be a recipient.
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That would be really nice!
Please take note Proton Engineers.
Those cfe w/ BOT is nothing special
CFE is not BOT, it’s a real turbocharged engine lol
CFE theoritically is turbocharged, but in actual it really response slow. Plus d stupid slow respond 4 speed auto transmission, u really can go nowhere.
since when proton use 4 auto tranny for cfe?
its ok to be a basher but its not ok to be a dumb basher tq
Oops, mix up CFE and CPS. But d CFE is having slow response for low rev when test drive Preve.
@Fai.. in case u r not aware of the technical aspect of CFE.. u need to rev it above 2k rpm in order to feel the turbo kick in.. below 2k rpm it will only accelerate like a NA 1.6 engine.. as the concept “pay per use” goes..
IDIOT, CFE is a real turbocharged and took years of development not BOT..please check you fact before commenting
The Germans are always being German. Creating new ideas to compete among themselves. Impressive. Now Audi is competing with BMW with turbocharging tech
I thought of that in year 2006. Great that someone made it happen. Audi FTW, daring to try.
Very good.
With this tech, in future, we can expect for lower power but higher efficiency engine, there’ll be no need for inter-cooler. So less components and cost!
i dont quite get ur statement..
turbocharging is about getting more power, not less.. and having a charged intake air will always require intercooler.. no need to go technically detailed on this..
having this tech will definitely require more parts (motor, sensors, etc) and higher cost.. and being an audi.. do anyone cares about price when buying one?
awesome! engineering at its best…at least to date..
Vorsprung durch Technik. hopefully this will be going into production soon and not only A4 will be receiving it but to the rest of the model line up as well.
Very sad to think about CFE from Proton…bocor sana bocor sini…
Until one customer asked Proton to cabut the CFE off as normal CPS…guess what the answer? Proton said mekanik tak pandai…LOL!
bye2 PREVE
Audi engineers just to make sure that their new designs dun sui kwan
No need R & D, do not search for new tech ya everybody especially SL’s sifu Toyota.
when i saw electric turbo on the net i think it is cool if there can combine it with regular turbo and nvr expect Audi is the one who try this method 1st.
BTW still hoping better efficient EV
The ultimate Qi Master of turbo technology.
the Germans really know how to make great cars
proton ada?
Conventional turbo + electrical turbo = Hybrid Tubrbo
audi is owned by VW. enough said.
for those not understanding, VW purposely promote this new technology to boost Audi’s image as a supersports sedan in its military.
Interesting: It’s not an ‘old style’ roots charger like the Eaton M45 used by Mercedes, it’s more or less a turbo driven by an electric motor.
As turbo’s rotate between approx. 85.000rpm and 250.000rpm, the drive amplifier seems to be very interesting as well… ;)
VW and Audi forever doing bodoh thing. Make 20V then say good. After that again say 16 valve better. Do Supercharger+Turbocharger then say good. After that say turbocharger alone is as good! And WTF, new VW engines eats black oil!