• Nov 18, 2008
Click above for high-res gallery of the Audi S5

If you didn't see this coming, we recommend a trip to the optometrist. Audi is about to swap the V8 engine in the S5 with the same supercharged V6 going into the new S4 sedan. Inside Line is reporting that the dulcet-but-dated 4.2L V8 is on the way out. The new 329-hp supercharged V6 engine will take its place. Call it the S-engine-elect.

With nearly the same power and much better fuel efficiency, the lighter V6 will be the cure for what ails the current S5. While its styling is superb, its powerband and porkiness have been criticized. Fans of the 4.2L V8 should know, however, that the engine might still live on, perhaps in twin-turbo form, replacing the V10 in the next-gen Audi S6 and S8. That V10 could also get the twin-turbo treatment and wind powering the upcoming R8-based R10. Got that? Good.

The base R8 will probably get that same updated V8, while the supercharged V6 might also work its way into the all-but-confirmed R4 engine bay. While that covers most of the R and S models, know too that Audi has big plans for its RS models as well, hoping to make them lighter and more powerful in its quest for Porsche blood. We're dizzy with anticipation.


[Source: Inside Line]


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  • 35 Comments
      • 6 Years Ago
      Get used to it or get a blender.

      http://www.youtube.com/watch?v=WsmxQ1P0xs0


      • 6 Years Ago
      This engine was an improvement over the port injection 5 valve/cylinder head V8 that was used, past its sell by date, in the old S4.
      http://www.audiworld.com/news/08/b8-s4-first-drive/B7S4vsB8S4power.jpg

      However compared to the direct injected 4.2 V8, it loses 20hp with no extra peak torque.
      http://gallery.audiworld.com/gallery/album431/S4080014_medium
      http://gallery.audiworld.com/gallery/album302/S5070018_medium

      and I'd like to see how much power the engine makes if the supercharger is off (bypass), or if the supercharger drive belt fails. (but you'd have other bigger problems then)

      Audi should have upgraded the A5 to the lower output 3.0S (supercharged) V6 (same as the '09 A6 300hp 310ft-lbs)
      Then Audi should have dropped the RS4 V8, into the S5. Hell, make it more civilized with dual intake runners, even if that dropped peak power down to 'only' 400hp. (but more peak torque)

      That would have left room for a 500hp V10 RS5.
      and Audi could have offered a front wheel drive A5 with the 2.0T

      Seems like Audi is stuck thinking in the box.
        • 6 Years Ago
        You're right on! I couldn't agree with you more.
        • 6 Years Ago
        A5 2.0T I4 Multitronic (for those that live in the sun belt)
        A5 3.0s V6 ZF 6hp21 (for those that want a 'nice' car)
        S5 4.3 V8 (use the larger piston/cylinder bore 85.5 vs. 84.5) S-tronic. Okay, skip the dual length intake runners-just make the runners a little bit longer, and use Audi Valvelift System. 400hp@7500, 325ft-lbs@5000, and the tumble flaps can be left off.


        RS5 5.3 V10 500hp@7000, 400ft-lbs@3500 ZF 8hp70 [8 speed auto]
        Didn't Audi say that they want to implement cylinder idling with their AVS? Well here is a good place to start.
        • 6 Years Ago
        once you fit an intake to the Force Fed Audi
        you'll get more of the great engine noise that
        you're missing out on, Audi intentionally muffled
        and insulated the intake/air box. The exhaust on the V8's that you love have that flap that's actuated at WOT to bypass the muffler and gives even MORE of that great engine noise..... if you simply put a proper intake and exhaust on the charged v6 you'll have the power and sound you were missing. The youtube clip is epic, but I expect the new S5 will sound great also.... once you fit an intake and exhaust.
      • 6 Years Ago
      I think too many people miss what Audi is doing with their line-up. Even the recent announcement by Audi themselves confirmed S models are meant to be civilized yet performance oriented vehicles, while the RS is meant to be the no-compromises performance model.

      Whether S5 owners want to admit it or not, from day 1 the S5 competed with the 335i and not the M3. The V8 growl is wonderful, but the S5 falls far behind the M3 in head-to-head comparisons. At the same time it's on par with the 335i in every test with the exception of fuel efficiency.

      Think about that, today's auto environment and remember Audi has some very agressive sales targets. Catering to people who are happy sacrificing fuel efficiency for a V8's growl is not a good move.

      I LOVE the A5/S5 and plan on making one of them my next car. I agree they should put a better V6 in the A5 (too underpowered for the price), but this V6 T is the way to go for the S5. V8 performance at V6 efficiency. Sorry, but the V8 growl isn't that important.

      It makes perfect sense for the line:
      A5 - Standard V6
      S5 - FI V6
      RS5 - FI V8
        • 6 Years Ago
        I disagree, I absolutely love the sound of the V8 which is why I will trading my S5 in for the RS5 when it comes out. Im expecting a Twin Turbo or Supercharged variant of the 4.2 V8 - or at least hoping. Audi's engines sound incredible and its honestly something that BMW has finally gotten with the E92 M3. It sounds fantastic also, but the same cant be said of the E46 6 cyl M3 - it simply sounds terrible in comparison.
      • 6 Years Ago
      How much lighter or fuel efficient is the blown v6 over the v8? Are there any figures out yet for this engine? Because everybody always assumes that less displacement = lighter and that's not always the case.
        • 6 Years Ago
        The new S4 is 10kg lighter than the old V8 S4, dispite being allot bigger.
        For comparison, the new A4 3.2 quattro is 40kg heavier than the old A4 3.2 quattro.
        • 6 Years Ago
        John D,

        Autoblog saves my account info in my browser, therefore it literally doesn't take much time at all to post, but it would've taken longer to read the linked article, time I didn't have at the time earlier. Plus, AB could've put those figures in their article so that I could've seen them as I was scrolling down.

        So I think you're really just going to have to get over it.
        • 6 Years Ago
        @ zamafir

        I still think they could have achieved the same in the V8 if they had decided to refine it and include some more fuel saving technology

        or maybe get 20% better and another 50HP
        • 6 Years Ago
        Oh great JF, well how wonderful that you didn't have time to read the linked article, yet you still found plenty of time to post an uneducated comment asking other people to do the research for you
        • 6 Years Ago
        Reading linked articles is fun.

        It's 30% more efficient, which is pretty significant, and will be faster (as we've already seen reported for the V8->V6T move in the S4).
      • 6 Years Ago
      Others have said it... I think everyone is missing the point here.

      If you can achieve the same performance with less fuel consumption, that is an outright win.

      We know the V8 S5 sounded dead sexy, but you can bet this new mill will sound alluring also. Why take exception to V6 engines? Show me someone who doesn't appreciate the 350Z/G35's VQ growl, and I'll show you someone who's hard of hearing.

      We all need to remember that these cars are for slightly insecure, mildly wealthy investment bankers and consultants---S5s are intended to be used as pussy magnets. And if you don't think she'll love it when you say, "I could have gone for the V8, but the supercharged V6 is just as fast but (gets better mileage)/(pollutes less)/(is better for the environment)/(rescues babies from burning buildings), you've got something coming.

      We are talking about a dead sexy sports car, but with a change that allows you to present it in a green/socially responsible light. Yuppie appeal with a bit of greenery; you could hit material girls and hippie chicks in the back seat. And when you're driving an S5, they know going in that you probably have a small penis. Which makes having one less awkward.
        • 6 Years Ago
        I wouldn't want to put an overnight bag in the back seat of an A5/S5 much less getting it on with a hippie chick.

        I'd say the RS4/RS5 is more the investment banker ride...at least it was. Now they'll all be driving Kias.
      • 6 Years Ago
      Pity they're dropping the V8. Atleast they're keeping it in the RS models.
      • 6 Years Ago
      What about the A8 and A8L? It currently uses a 4.2L V8? Will it get a refreshed 4.2L engine?
        • 6 Years Ago
        ditto on the R8... how is the new 4.2L TFSI different from the current one?
          • 6 Years Ago
          The A8 uses the same engine I believe as the S5 but this is different than the engine that the RS4 and R8 Share. Look at the wiki
        • 6 Years Ago
        nvm. i've been living a lie.
      • 6 Years Ago
      This retreat from V8 to V6-FI solidifies the S5 as a competitor to the 335i, and not to the M3 as many wrongfully believe.
      • 6 Years Ago
      BrianFL, you said a mouthfull. Though it wont be long when other automakers follow suit. That would be a sad day indeed.
      • 6 Years Ago
      Executive meeting: "How can we get another black dot for engine reliability in Consumer Reports?"
      "VW V6 + supercharger, ja! Shnell!"
        • 6 Years Ago
        Wow that's a statement back from 1981...

        You do know that Audi consistently places very well in reliability reports. In fact not only are they the only manufacturer still in the green as far as car sales every month (besides Mini), they are doing very well.

        BTW - the V6 is ALL Audi, has nothing to do with any VW engine ever made - ever!
        • 6 Years Ago
        Zing!
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