APR releases C7 S6/RS6 & S7/RS7 4.0 TFSI V8 downpipes - 700 awhp

[Sticky]

APR finally officially released their cast downpipe option for the 4.0 TFSI V8 motors in the Audi S6, RS6, S7, and RS7. Support for the A8 4.0 TFSI and S8 models will come next. For now if you have an RS7 you can enjoy 700 horsepower to all four wheels on race gas with a Stage II tune and these downpipes.

That is a ton of power. Not to mention the incredible torque figure of 843 lb-ft at the wheels:

How the transmission is holding up to that much torque is anyone's guess.

Numbers obviously are lower on pump gas but here are the S6/RS7 and RS6/RS7 on pump gas with the downpipes:

What do you even say to over 700 lb-ft at the wheels on 91 pump gas? That's amazing.

Depending on the fuel quality gains with the downpipes range from 20-50 all wheel horsepower. Whatever fuel you run, they are well worth it.

The proof is in the 1/4 mile numbers. The APR race gas tune and downpipes get an S7 to 11 flat in the 1/4 mile at 124.61 miles per hour:

The 4.0 TFSI V8 is really starting to come into its own and we have yet to see a US car running larger aftermarket turbos. Although at that point fueling issues and the transmission coping with the torque no doubt will be a problem.

Quick facts:

• More power and better response
  Expect a decrease in turbo lag with power and torque gains as high as 59 HP and 95 FT-LBS of torque over APR Stage I!
• Full 76mm downpipe system
  The APR system is a full downpipe upgrade as it replaces the kinked 60mm catalyst cross pipes and resonated midpipes with straight through, 76mm mandrel-bent tubing.
• Port-matched investment-cast downpipe inlets
  The factory inlets are restrictive. APR’s cast system allows for massive, port-matched inlets that smoothly neck down over a long distance. The result is improved flow, better response and more power.
• Dual, high-flow catalysts
  GESI’s encapsulated catalysts are known for their strength and performance. Expect lower emissions, reduced noise and less exhaust smell compared to catless setups, all without negatively impacting performance to over 1,000 HP. Furthermore, with the catalyst moved, expect a cooler engine bay!
• T304L stainless steel construction
  Premium grade T304L stainless steel resists corrosion and stands the test of time.
• Argon back-purged TIG welding
  Clean, strong and attractive welds both inside and outside the pipes.
• OEM-style low-profile slip-on clamps
  The APR slip-clamps are easy to use, resist leaks and pipe deformation better than swedged setup, are lower profile than vbands and flanges and don’t require replacement gaskets.
• OEM-style internally-corrugated flex sections
  APR’s flex sections are internally corrugated to increase flow and prevent failures common with braided flex sections.
• Investment cast secondary oxygen sensor bungs
  APR’s obsession to details resulted in investment cast oxygen sensor bungs that sit on top of the piping, preventing material from protruding into the exhaust stream, disrupting flow.
• Compatible with the OEM catback exhaust
  Bolt-on and go! The system is fully compatible with the factory catback exhaust.
• Designed, assembled and quality controlled in-house
  All critical aspects of the system are handled internally to ensure the highest quality fit and finish.
• All hardware and instructions included
  New OEM gaskets, oxygen sensor harnesses, clamps, brackets and install instructions are included to make the install as headache free as possible.
• APR Stage II ECU Upgrade price waived
  With every APR downpipe purchase comes a free upgrade to Stage II from Stage I, saving consumers hundreds of dollars!
• Limited lifetime warranty
  The best system on the market also carry the best warranty in the industry!

[Ensoniq]

I think the ZF transmission is rated to 800 FT lbs so only 10% over

lets keep pushing it ain't broke yet

[Sticky]

I think the ZF transmission is rated to 800 FT lbs so only 10% over

lets keep pushing it ain't broke yet

Guys have run into issues already though. I don't think there are any upgrade options for it though.

[Stockguru]

I wish. The RS7 has uses the ZF 8HP55AF (AL551-8Q) which has a max. torque rating of 700 Nm which is only 516 ft-lbs of torque. This is why the RS7 comes with exactly 516 ft-lbs of torque from the factory. They capped it right at the transmission's torque limit.

I think the ZF transmission is rated to 800 FT lbs so only 10% over

lets keep pushing it ain't broke yet

[Stockguru]

None with stock turbos though right?

I wish. The RS7 has uses the ZF 8HP55AF (AL551-8Q) which has a max. torque rating of 700 Nm which is only 516 ft-lbs of torque. This is why the RS7 comes with exactly 516 ft-lbs of torque from the factory. They capped it right at the transmission's torque limit.

[Stockguru]

That last post was supposed to quote Sticky's response about the RS7 tranny failures.

[Sticky]

I wish. The RS7 has uses the ZF 8HP55AF (AL551-8Q) which has a max. torque rating of 700 Nm which is only 516 ft-lbs of torque. This is why the RS7 comes with exactly 516 ft-lbs of torque from the factory. They capped it right at the transmission's torque limit.

It sure seems to be handling quite a bit more torque than stock though.

The problem is, who can upgrade it?

[Sticky]

That last post was supposed to quote Sticky's response about the RS7 tranny failures.

I don't think so. I'm not sure what @Ghost. is doing with his RS7 as he has larger aftermarket Garrett turbos.

How is he getting the tranny to cope with that?

[Ensoniq]

What issues have you heard about?

the only drivetrain things I've heard were axle issues / shaft thought to be from wheel hop from sticky tires

[Ensoniq]

I wish. The RS7 has uses the ZF 8HP55AF (AL551-8Q) which has a max. torque rating of 700 Nm which is only 516 ft-lbs of torque. This is why the RS7 comes with exactly 516 ft-lbs of torque from the factory. They capped it right at the transmission's torque limit.

thanks for this info

[spool twice]

Im happy that it somewhat has a cat, not a fan of fully catless cars for smell reasons. I'm curious to see if GIAC will team with AWE-tuning to release a similar product now...

With it being catted, I am more inclined to get an S7 for my next car and go this route when it comes time to replace my S5 in a year and a half.

[Sticky]

What issues have you heard about?

the only drivetrain things I've heard were axle issues / shaft thought to be from wheel hop from sticky tires

I've heard about the wheel hop issues but as mentioned earlier guys with upgraded turbos have had problems.

Some tuners in Europe are limiting the torque of their offerings to protect the trans as well. I assume they know what they are doing.

[Sticky]

I'm curious to see if GIAC will team with AWE-tuning to release a similar product now...

GIAC seems to be way behind on this platform.

[kouzman]

I've heard about the wheel hop issues but as mentioned earlier guys with upgraded turbos have had problems.

Some tuners in Europe are limiting the torque of their offerings to protect the trans as well. I assume they know what they are doing.

I do not know if one RS7 with upgraded turbos with the exception of the Russian blue car.

I will wait to see a few cars at the strip first before I proceed with the upgrade.

I can imagine what my car will do on the extra power and torque plus the 104 octane map that they now offer for the C7 RS7!

[Sticky]

I do not know if one RS7 with upgraded turbos with the exception of the Russian blue car.

I will wait to see a few cars at the strip first before I proceed with the upgrade.

I can imagine what my car will do on the extra power and torque plus the 104 octane map that they now offer for the C7 RS7!

What upgrade would you proceed with though? There is no turbo option from APR and the only turbo upgrade hardware is from TTE in Germany as I understand it.

I'd love to see you run 9's!

[kouzman]

no I am just talking about the downpipes! LOL! turbos I will not do...

I estimate a solid 50awhp plus retarded torque on a stage 2 104 octane setup from what I have right now.

So far I have ran a 10.61 best ET and almost 132mph trap... with another 50awhp or so I expect the car to go 134 easily in the less than 10.50 on a consistent basis. That would be almost unbeatable in street conditions...

Plus based on the APR numbers, a stage 2 car on pumpgas is making the same with a stage 1 on 100 octane! So 10.60s@130+ on a daily basis!!!

[Sticky]

no I am just talking about the downpipes! LOL! turbos I will not do...

I estimate a solid 50awhp plus retarded torque on a stage 2 104 octane setup from what I have right now.

So far I have ran a 10.61 best ET and almost 132mph trap... with another 50awhp or so I expect the car to go 134 easily in the less than 10.50 on a consistent basis. That would be almost unbeatable in street conditions...

Plus based on the APR numbers, a stage 2 car on pumpgas is making the same with a stage 1 on 100 octane! So 10.60s@130+ on a daily basis!!!

Yep but you need the new tune to go with it. From what some have told me its mostly the software making the difference.

Too bad they don't tune for E85. Too bad they won't custom dyno tune you either.

[kouzman]

Yep but you need the new tune to go with it. From what some have told me its mostly the software making the difference.

Too bad they don't tune for E85. Too bad they won't custom dyno tune you either.

In my opinion, the answer is yes and no... Yes they further improved the software, probably boost and timing changes, but is was only doable in a safe manner by using a downpipe setup which could allow better flow, less backpressure, lower EGTs, etc...

In theory you might be able to run the stage 2 file on the stock exhaust but not without risks, or certain safety thresholds exceeded... Plus I doubt the car itself would let you run the optimum file consistently, since EGTs and flow would be less than optimal...

BTW, if you are an existing APR customer, they do not charge you for the tune upgrade.

For APR, I see it as a good move to sell hardware, along with optimized software.

Let's give it a few weeks and see what cars actually run on the stage 2 setup, compared to stage 1. I think the RS7s will be faster no doubt.

[Sticky]

In my opinion, the answer is yes and no... Yes they further improved the software, probably boost and timing changes, but is was only doable in a safe manner by using a downpipe setup which could allow better flow, less backpressure, lower EGTs, etc...

In theory you might be able to run the stage 2 file on the stock exhaust but not without risks, or certain safety thresholds exceeded... Plus I doubt the car itself would let you run the optimum file consistently, since EGTs and flow would be less than optimal...

BTW, if you are an existing APR customer, they do not charge you for the tune upgrade.

For APR, I see it as a good move to sell hardware, along with optimized software.

Let's give it a few weeks and see what cars actually run on the stage 2 setup, compared to stage 1. I think the RS7s will be faster no doubt.

Yep, the 1/4 mile times should tell the story. Let's see what they do.