2015 Audi RS5 E-TDI

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TheAdvocate

TheAdvocate

Platinum Member
Mar 7, 2005
2,561
7
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A diesel, turbo RS with electronic motor assist.

Specs

- 3.0L TDI
- 385 hp
- 553 lb ft torque
- 0-60 < 4 secs
- 44.4 mpg


http://m.youtube.com/watch?v=MMfP6YP2Y9Q

http://m.youtube.com/watch?v=1XeS0VWJf3A


The V6 biturbo in the Audi RS 5 TDI concept produces 283 kW (385 hp); from 1,250 to 2,000 rpm it transfers 750 Nm (553.2 lb-ft) of torque to the crankshaft. The red-line is at 5,500 rpm. The supplemental electric turbocharger provides for staggering power when starting off. An electric motor replaces the turbine wheel and accelerates the compressor wheel to over 70,000 rpm in a few hundredths of a second. The exhaust turbochargers also provide as much as 2.4 bar of relative boost pressure.

This combination enables the Audi RS 5 TDI concept to sprint from 0 to 100 km/h (62.1 mph) in just four seconds. The 200 km/h (124.3 mph) mark is reached in less than 16 seconds, and top speed is 280 km/h (174.0 mph). The average fuel consumption of less than 5.3 liters of diesel per 100 kilometers (less than 140 grams CO2 per kilometer) (44.4 US mpg/225.3 g/mi) documents the outstanding efficiency.

Recuperation is the primary source of the drive energy for the electric turbocharger. To transmit this energy, the RS 5 TDI concept uses a separate 48-volt electrical system that is connected to the conventional 12-volt electrical system via a DC/DC converter. The energy is stored in a compact lithium-ion battery. The advantage of 48-volt electrical systems is that they enable the transmission of larger amounts of energy. This makes them an important milestone in the Audi electrification strategy.
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Criticism will probably be price and overengineered, but those are a staggering combination of performance and efficiency specs. Eventually they will trickle down to mainstream cars. Very exciting.
 
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TheAdvocate

TheAdvocate

Platinum Member
Mar 7, 2005
2,561
7
81
I'd like to see what they can do with the 2.0L TDI engine, in the golf, jetta and passat. The 2015 unassisted TDI is 150 hp / 236 lb ft. 220 / 330 range, and > 40 mpg ?
 
_Rick_

_Rick_

Diamond Member
Apr 20, 2012
3,983
74
91
Nice to see concept cars using race-car tech.
Strange that it's Audi at the fore, since they didn't run a turbo motor/generator in their LMP1 cars this year.

The high voltage DC battery system may not make it into production for quite some time - at 48V you start encountering a few safety issues, I assume.
 
M

MixMasterTang

Diamond Member
Jul 23, 2001
3,167
176
106
Why does it take 16 seconds for it to reach 125mph? That seems awful slow for a car that is getting to 60mpg in less than 4 seconds!
 
TheAdvocate

TheAdvocate

Platinum Member
Mar 7, 2005
2,561
7
81
MixMasterTang said:
Why does it take 16 seconds for it to reach 125mph? That seems awful slow for a car that is getting to 60mpg in less than 4 seconds!
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Did you watch the video with them chasing the RS6? The engineer explained that the electronic assist on the turbo is designed to make starts faster, but does lose out to a perfomance gas engine at higher speeds. The point being that most driving circumstances prefer acceleration off the line or at low speeds, instead of at high speeds. So that RS6 is probably a faster overall track car, but in day to day driving, the RS5 e-TDI is going to be really fast (and get 44.4 mpg!).

Also as far as it being a concept - did you watch the video? That vehicle looks production ready (though I cant speak to 48V battery safety issues). Audi intends to build this tech, but I do agree it'll probably be a while, if ever, that NA gets to see that tech. I hope it filters down and we eventually get it here, because those specs are amazing.
 
D

Dman8777

Senior member
Mar 28, 2011
426
8
81
I'm not sure why a 48 volt circuit in a car would be any more dangerous than the 110 volt or 230 volt circuits in your house...
 
S

smackababy

Lifer
Oct 30, 2008
27,024
79
86
TheAdvocate said:
Did you watch the video with them chasing the RS6? The engineer explained that the electronic assist on the turbo is designed to make starts faster, but does lose out to a perfomance gas engine at higher speeds. The point being that most driving circumstances prefer acceleration off the line or at low speeds, instead of at high speeds. So that RS6 is probably a faster overall track car, but in day to day driving, the RS5 e-TDI is going to be really fast (and get 44.4 mpg!).

Also as far as it being a concept - did you watch the video? That vehicle looks production ready (though I cant speak to 48V battery safety issues). Audi intends to build this tech, but I do agree it'll probably be a while, if ever, that NA gets to see that tech. I hope it filters down and we eventually get it here, because those specs are amazing.
Click to expand...

I can't see the video, but it sounds like they are doing it wrong then. Take the McLaren P1 (which, I understand is in an entirely different league than the RS5... hell, they aren't even in the same sport), it uses an electric engine to assist in powergap scenarios (including take off). It is a brilliant use of both a gasoline engine and an electric motor in both their best aspects. Sure, it has like 900HP and only gets around 6 miles on just electric power, but who cares?
 
EvilYoda

EvilYoda

Lifer
Apr 1, 2001
21,198
9
81
smackababy said:
I can't see the video, but it sounds like they are doing it wrong then. Take the McLaren P1 (which, I understand is in an entirely different league than the RS5... hell, they aren't even in the same sport), it uses an electric engine to assist in powergap scenarios (including take off). It is a brilliant use of both a gasoline engine and an electric motor in both their best aspects. Sure, it has like 900HP and only gets around 6 miles on just electric power, but who cares?
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Different concept - this doesn't have a separate electric motor that's capable of generating power to drive the wheels, just a fast and high-revving one to turn the electric turbo.

And yeah...P1's a completely different beast.
 
_Rick_

_Rick_

Diamond Member
Apr 20, 2012
3,983
74
91
Dman8777 said:
I'm not sure why a 48 volt circuit in a car would be any more dangerous than the 110 volt or 230 volt circuits in your house...
Click to expand...

For the same reason that your dinner table chair has no seat belts.
Fire fighters may have to cut you out of a car, and you may crash the car.
This year's LMP1 cars all had safety lights installed for pit stops, and special e-safety experts that were carted out to crashed cars to make sure the electrical systems were safe, before any marshal was allowed to touch it. Since I assume they recycled their race-tech (the engine sounds a lot like their original LMP1 idea, which they couldn't get to work in time for the start of the season), these same issues persist.

12V is already enough to sting a little, in the right conditions, but 48V is likely going to flow through whoever touches a open lead, and those batteries can probably discharge quite effectively. You definitely want a reliable emergency shut-off system for those higher voltage circuits.
 
theeedude

theeedude

Lifer
Feb 5, 2006
35,787
6,197
126
The whole point of a higher voltage system is to have a lower current at same power output. I = P/V.
Think about that next time you are building a computer with a chip running at 200 Watts at 1V :)
Yes, if you short it with a fixed resistor, it's going to be higher current, but they can put a circuit breaker rated for a lower current than they would need in a 12V system.
 
LTC8K6

LTC8K6

Lifer
Mar 10, 2004
28,520
1,576
126
48V is still safe and allows much lower amperage. It also allows much smaller wires with that lower current.
 
S

smackababy

Lifer
Oct 30, 2008
27,024
79
86
EvilYoda said:
Different concept - this doesn't have a separate electric motor that's capable of generating power to drive the wheels, just a fast and high-revving one to turn the electric turbo.

And yeah...P1's a completely different beast.
Click to expand...

Again, sounds like they are doing it wrong. =)
 
S

sontakke

Senior member
Aug 8, 2001
895
11
81
Our EPA has specific drive cycle to measure the fuel consumption of a vehicle for the sticker purposes. What is the equivalent European test? Is the so called highway mileage measured at 55 mph in Europe? I would be shocked if the Audi returns the 40 mpg when driven in the performance mode.
 
K

Knowing

Golden Member
Mar 18, 2014
1,522
13
46
I attended a presentation by a components manufacturer that claimed it was working with a Euro OEM on an electric turbo application. This just about matches up with everything they were telling us.

If they make an Avant it would be in the running for our household's next daily.
 
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