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  1. #1
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    Turbo upgraded 4.0 TFSI V8 vs. 2.5 TFSI I5 - RS7 vs. RS3 - Big bro vs. little bro - Who wins?

    This is a battle we have all been waiting to see. The Audi RS7 4.0 TFSI V8 gets a ton of credit and deservedly so. There were those who mocked Audi for providing the smallest twin turbo V8 in last generation's mid-size sport sedan market yet Audi's potent mill proved to be the strongest tune only despite its displacement disadvantage.

    Click here to enlarge

    Amusingly, Mercedes-AMG went to a similar style V8 for the new W213 E63 yet it isn't as strong with a tune as the now old RS7. Obviously, the 4.0 TFSI is stout with RS7's running 10.2's in the 1/4 mile at 133+ which is the stock turbo record in the USA.

    The RS3 is already beating that. Easily. The little brother barely entered the market and is already kicking ass and taking names.

    Now what is interesting in the video here is you have an RS7 on upgraded Garrett turbochargers. You will notice there are not really any successful upgraded turbo RS7's running around and this RS7 is said to still be under development.

    The RS3 has a big turbo setup from Iroz on E85.

    What happens? The RS3 spanks it. The guy in the RS7 needs his eyes checked if he thinks that was close. Say what you want about having a V8 carrying 1000 less pounds makes a huge difference. So does that dual clutch transmission in the RS3.

    From a 35 mph roll it's ugly too. The RS3 runs away.

    Why haven't big turbo RS7's shown well? Who knows. Big turbo RS3's are already crushing them though and it's not likely to get any closer from here on out as 2.5 TFSI tuning accelerates.


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    1 out of 1 members liked this post. Yes Reputation No
    Would be interesting to see how well it would hold....Great stuff!

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    Hold up... the RS7 has bigger turbos, but is still running stage 2 software, right? If so, yeah, it's not going to be any faster.
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    Click here to enlarge Originally Posted by Arin@APR Click here to enlarge
    Hold up... the RS7 has bigger turbos, but is still running stage 2 software, right? If so, yeah, it's not going to be any faster.
    That's exactly right.

    Not sure why the ran it like that.

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    These two and the new TT RS and new R8 are the only Audi's I would own. The RS3 is so badass for a little car

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    I wish they made the TT-RS look a little more badass but it's awesome.

    Weighs 300 pounds less...

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    1 out of 1 members liked this post. Yes Reputation No
    The Rs7 would be faster with stock Turbos
    Hellcat 1300+
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    WK2 s/c sold

    IG SDRPerformance

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Why haven't big turbo RS7's shown well? Who knows.
    From what I read when researching TTE800 kit for the RS6/7 the turbos are not the limiting factor when it comes to making power with the 4.0T, and that there were very minimal gains to be had by upgrading them. Can't remember the exact weak link in the equation since it was so long ago but I think maybe fueling..?

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    RS7 is claiming 621whp on 91 octane and 23psi.

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    Click here to enlarge Originally Posted by nbrigdan Click here to enlarge
    From what I read when researching TTE800 kit for the RS6/7 the turbos are not the limiting factor when it comes to making power with the 4.0T, and that there were very minimal gains to be had by upgrading them. Can't remember the exact weak link in the equation since it was so long ago but I think maybe fueling..?
    This is what's unclear. I've heard it's the intake.

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    Not to discount how fast the RS3 is, but that RS7 was not really performing as expected. To my knowledge there is not a proper aftermarket turbo RS7 out yet... Some people are trying but we have not seen encouraging results.

    The RS3, however is an amazing platform. I wont be surprised if in a year or so, we start seeing a bunch of cars running 9s like its nothing!!! very impressive!!

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    Click here to enlarge Originally Posted by nbrigdan Click here to enlarge
    From what I read when researching TTE800 kit for the RS6/7 the turbos are not the limiting factor when it comes to making power with the 4.0T, and that there were very minimal gains to be had by upgrading them. Can't remember the exact weak link in the equation since it was so long ago but I think maybe fueling..?
    from what I've heard the IC is the bottleneck... even TTE admitted on an audi forum that without improved IC capacity/Flow, that their turbo upgrades didnt perform much better than stock

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    Click here to enlarge Originally Posted by gaspam Click here to enlarge
    even TTE admitted on an audi forum that without improved IC capacity/Flow, that their turbo upgrades didnt perform much better than stock
    Isn't that very easy to address? Is this some magical intercooler?

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    You would think so. Just bypass or eliminate OEM unit and go air to air if anything...

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Isn't that very easy to address? Is this some magical intercooler?
    I keep hearing some people are making one but never see it... I know space is a limiting factor under the hood so what about a killer chiller or something similar? Forge has a larger heat exchanger but the IC remains the same small core... part 8 in the pic is the IC and it feeds both turbos (M5 and E63 have separate IC's for each turbo)

    Click here to enlarge

    Its just kinda crazy, with RS7 being so potent on stock turbos pretty quickly after they initially came out, that in all the time since then we havent seen more than 2- 3 people finding a way to successfully run upgraded turbos.

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    3 out of 3 members liked this post. Yes Reputation No
    Click here to enlarge Originally Posted by Stevenh Click here to enlarge
    You would think so. Just bypass or eliminate OEM unit and go air to air if anything...
    MRC tuning in the UK are working on air to air set-up, check there facebook page.

  17. #17
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    Click here to enlarge Originally Posted by Sledgehammer255 Click here to enlarge
    MRC tuning in the UK are working on air to air set-up, check there facebook page.
    Just put up an article on it, thanks for the heads up!

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    I think the best solution right now would be to run meth/water injection, primarily for its cooling properties. Even if you were to drill and tap the factory intake manifold, the cost of replacement is not to high.

    If I had kept my RS7 I would probably have gone that route for the extra cooling, even with the stock turbos on the racegas map. During the hot summer days the car would definitely heatsoak to the point of running 4-5mph less traps on the 1/4 mile!
    2015 Porsche 911 TTS

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