[Audi69]

Use the RS4 engine. Am I right in saying that this engine has one turbo. If so I suggest they add a turbo making a Bi-turbo 4.2. I think that will be sufficient not addiing much more weight

[Tycoon]

4.2 V8 FSI in current RS4 ain't Turbo'ed...

[Foxfire]

Exactly! I'd rather see the current V8 tuned / turboed for a higher output than put an even larger engine in the bay. What's this obsession with ever larger engines that only serve you in a straight line?

[Tycoon]

Correct!

And i agree with my fellow Croat here, a turboed V8 would be much appropriate for this car. Leave those V10s for 6, 8, R8 and future 7 models.

[Merc1]

I don't see how they'd get a V10 in there anyway. That would be like putting a V10 in an A4. It would be an awfully tight fit. The S5 is just fine with me. Didn't know what to think of it until seeing and sitting in it.

M

[Audi69]

Turbo or Bi-Turbo 4.2 then I suggest. Preferably bi-turbo to iliminate most of any turbo lag. Also high reving engine so makes more sense. A brilliant engine alreday witha bI-turbo thin kof how good it really could be.

I've heard rumours that a Bi-turbo of VW/Audis's 3.2 engine is in the works so why not for the 4.2 as well if most of the technology and testing has alreday been done. Also Bi-turbo already for the new RS6 so more than likely for the RS4/RS5

V10 for RS4 in my opinion is not a good idea and I agree with you Tycoon.

[Tycoon]

Originally Posted by Audi69

I've heard rumours that a Bi-turbo of VW/Audis's 3.2 engine is in the works so why not for the 4.2 as well if most of the technology and testing has alreday been done.

Yeah, what's happening with that engine? When are we supposed to see it?

Originally Posted by Audi69

V10 for RS4 in my opinion is not a good idea and I agree with you Tycoon.

I'm glad.

[Tumbo]

The R8 may be getting all the press as of late, but Audi’s not done with their growing performance lineup by a longshot. Several weeks ago, quattro GmbH’s director Werner Frowein confirmed to Auto Motor und Sport that his wing of Audi would be stepping up its work for 2008. The current RS 4’s retirement may be imminent, but production of the R8, RS 6 and upcoming Q7 V12 TDI will keep his team busy. So too will new projects, and two of these expected expansion models are the much-anticipated TTRS and RS5 coupes.

In the same Auto Motor und Sport piece, Frowein mentioned that the previous brew period of four years into a six year model cycle would shorten to two in the future. RS versions of both the TT and the A5/S5 have both been spotted undergoing testing, and Frowein’s math should put a TTRS on a show stand by as early as Paris in September and an RS5 sometime in 2009. Such a rapid launch plan should mean little sleep for the boys at quattro GmbH.



RS5
Details on the RS5 are less known, but strong theories are out there. S5 mules have been spotted testing in Europe well after the S5’s launch, and with the trademark RS oval tailpipes. They’re likely RS5 mules and we even hear that there may be an RS5 mule high altitude testing in America.

Print magazines have hinted at a number of engine directions – from the RS4’s high-revving 4.2-liter V8 carryover to the twin-turbocharged V10 of the RS 6 and everything in between. Here’s a quick rundown, supported with our own theories and comments shared by sources at Audi.

1. V10 Twin Turbo – This is an unlikely choice. Fitted in the RS 6, the engine forces pricing of the A6 variant into six-figure territory. Packaging might also prove difficult as the already sizeable V10 also has the turbo system’s plumbing.

2. V10 Normally Aspirated – The most recent issue of Road & Track raised this scenario. The American print magazine said sources close to the book have stated that Audi is working on a high-revving V10 FSI – what the RS4 4.2 is to normal 4.2 FSI, this engine would be to the S8’s V10. R&T’s suggestion points toward a shared approach with the upcoming R8 V10. That scenario doesn’t sound totally unbelievable and, should Audi be able to hit the magical100 hp/liter mark of the RS4, that would mean 520 hp. Still, one source at Audi says the V10’s fitment in the S5 chassis is unlikely but wouldn’t rule it out.

3. Forced Induction 4.2-liter FSI – Utter those words and people will immediately think of the last-generation RS6 and its twin turbo V8. The UK’s Car Magazine seems to think this scenario is most likely, suggesting 450 hp and 500 ft-lbs. of would could come from a mildly turboed RS4 engine.

Our own sources say this is unlikely in the details. First, the RS4’s high-revving setup likely wouldn’t get forced induction. Figure something more like the S5’s 4.2 FSI. If the next-generation S4 is supercharged says that source, then figure the lessons learned might be applied to other engines also. Fit a supercharger to the S5’s engine and the power figures suggested by Car aren’t out of reach.

4. V8 Normally Aspirated, RS4-spec – At 420 hp from 4.2-liters, the RS 4 engine is by far no slouch. Top Gear’s Jeremy Clarkson has raved about the mill, saying it might just be one of the best engines ever. Carrying over the engine lock, stock and barrel from the outgoing RS 4 is another possible scenario. No, it’s nothing new, but it’s still great and would be a ton of fun in the better-balanced B8-chassis coupe.

At this point, it’s a bit to0 early to make the call. Options 2, 3, and 4 all seem like believable scenarios, so we’ll hold off on betting the farm on which will get the nod just yet. One thing’s for sure, any one of the four would be formidable with the platform, Audi Drive Select and the next-generation torque-vectoring quattro.

As with the TTRS, the RS5 rendering above shows how the upcoming car might appear if it were launched today. The latest RS design language from the RS6 such as the nose, wheels, ur Quattro-inspired blister fenders and more have been applied to the A5’s lithe silhouette. It all looks fantastic in Audi’s Ibis White with titanium finish on the RS6 alloys.

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[GTA8.5]

It all sounds wonderful!

i`m going to take a shot at the engine choice for the RS5. It should be the 4.2liter V8 (from the RS4), Bi-Turbo charged with around 480ps-510ps (this model has the CLK63 and M3 coupe square in it`s aim!). Using a V10 would make the car too nose heavy. I believe Audi will use the V8 of some sort.

[Yannis]

Originally Posted by GTA8.5

It all sounds wonderful!

i`m going to take a shot at the engine choice for the RS5. It should be the 4.2liter V8 (from the RS4), Bi-Turbo charged with around 480ps. Using a V10 would make the car too nose heavy. I believe Audi will use the V8.

The 5.2 lt V10 NA is lightweight , only 220 kgr.

Adding two turbos to the 4.2 lt V8 will make it more heavy that the V10.