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    Thread: APR TT RS RSC Catback Exhaust Teaser!

    1. 10-10-2011 03:27 PM #26
      so chip ready end of this month?

      will it require ecu removal?

    2. Forum Sponsor Arin@APR's Avatar
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      10-10-2011 03:34 PM #27
      I don't have answers for those questions yet.
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      10-10-2011 06:01 PM #28
      Quote Originally Posted by mtbscoTT View Post
      Not sure what you mean by this? The RS is already noted for its broad flat torque curve. Are you saying that your product is going to give more of the same? or change that broad flat curve? I'm hoping it's adding more but keeping the overall curve similar, not peaky.
      I'm sure Audi would love to keep the torque flat all the way to redline, but they weren't able to due to the turbo running out of steam up top.

      The easiest way to get "gains" aftermarket is to push that flat torque curve UP and make it much more peaky. This will boost mid-range torque (and therefore power, of course).

      The downside to the peaky torque curve is that the car will "feel" like the acceleration is slowing as the RPM increases towards redline, as opposed to stock where it feels like it just keeps on pulling.

      As far as APR's chip for the US market, I would expect the power output to be less than the ROW markets due to the maximum available gas octane being 91 in many locations across the country.

    4. Forum Sponsor Arin@APR's Avatar
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      10-10-2011 06:12 PM #29
      Quote Originally Posted by Marty View Post
      I'm sure Audi would love to keep the torque flat all the way to redline, but they weren't able to due to the turbo running out of steam up top.

      The easiest way to get "gains" aftermarket is to push that flat torque curve UP and make it much more peaky. This will boost mid-range torque (and therefore power, of course).

      The downside to the peaky torque curve is that the car will "feel" like the acceleration is slowing as the RPM increases towards redline, as opposed to stock where it feels like it just keeps on pulling.

      As far as APR's chip for the US market, I would expect the power output to be less than the ROW markets due to the maximum available gas octane being 91 in many locations across the country.
      We will offer 91, 93 and 100 octane programs so don't expect less power.
      GoAPR.com | Facebook | YouTube | Twitter | Instagram
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      Address: APR LLC, 4800 US HWY 280 West, Opelika, AL 36801

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      10-10-2011 06:46 PM #30
      Quote Originally Posted by Marty View Post
      I'm sure Audi would love to keep the torque flat all the way to redline, but they weren't able to due to the turbo running out of steam up top.

      The easiest way to get "gains" aftermarket is to push that flat torque curve UP and make it much more peaky. This will boost mid-range torque (and therefore power, of course).

      The downside to the peaky torque curve is that the car will "feel" like the acceleration is slowing as the RPM increases towards redline, as opposed to stock where it feels like it just keeps on pulling.

      As far as APR's chip for the US market, I would expect the power output to be less than the ROW markets due to the maximum available gas octane being 91 in many locations across the country.
      Interesting.
      What about in the low RPM range then? In other words, would a typical Stage 1 tune (say, on a normal TT and not a TTRS) give you less turbo lag?

    6. Forum Sponsor Arin@APR's Avatar
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      10-10-2011 06:55 PM #31
      An ECU tune will always give you less turbo lag to some degree.
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      10-10-2011 07:09 PM #32
      Quote Originally Posted by Arin@APR View Post
      We will offer 91, 93 and 100 octane programs so don't expect less power.
      Correction: We will probably get less power over here in California on the 91ACN fuel.

    8. 10-10-2011 10:14 PM #33
      in alberta we have 94 at husky

    9. 10-11-2011 12:06 AM #34
      What does one do if they have 92 at most local stations...

      If you run the 91 program with 92 fuel, are there any additional benefits?

      What would be the impact of running the 93 program with 92 fuel?

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      10-11-2011 12:27 AM #35
      Quote Originally Posted by Higher750 View Post
      What does one do if they have 92 at most local stations...

      If you run the 91 program with 92 fuel, are there any additional benefits?

      What would be the impact of running the 93 program with 92 fuel?
      Personally, I'd rather run slightly more conservatively with some knock margin (91 program with 92 fuel) than more aggressively at the knock limit (93 program with 92 fuel).

    11. Forum Sponsor Arin@APR's Avatar
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      10-11-2011 01:22 PM #36
      Quote Originally Posted by Marty View Post
      Hey Arin,

      I noticed that for your B8 S4 3.0T RSC exhaust, you've advertised a reduction in SPL for the 131 Hz tone when driving at 70 mph.



      Then you went on to post the sound spectrum at 70 mph, comparing no muffler vs. stock vs. competitor vs. APR RSC:



      Quoting the text on your website:


      That's great and all, but I had two follow-on questions (which I hope are being thought about for the TT-RS exhaust):

      1) While the 131 Hz tone is reduced by ~8 dB from stock, the ~57 Hz tone is ~6 dB *louder* than stock (or even no muffler)! It's not obvious to me which is a more annoying drone: the 131 Hz tone, or the 57 Hz tone. Depending on which is more noticeable, it looks like the RSC could actually be making it worse compared to stock. Do you disagree?

      2) All of the analysis on your site was performed at single speed of 70 mph. I'm sure that this spectrum changes dramatically as a function of vehicle speed (and thus engine speed), and of course load. What sort of analysis / validation do you do to ensure that while things may be improved at 70 mph, that they're not significantly worse at, say, 75 mph?

      Thanks!


      Marty,

      I spoke with engineering for clarification on the questions you asked.


      1. Tones at very low frequencies have not been as much of an issue unless the engine is switching displacement. For the Audi, that will not matter until the new 4.0 TFSI is released with cylinder shutoff control. Another factor is the penetration of the tones above the broadband levels. Less penetration means the tones are less noticeable and multiple tones close to each other can actually be more pleasing to the ear. Our designs target the dominant tone around 100 - 130 Hz and usually increase the tones at lower frequencies (typical for resonators with tailpipes). If the tones are not significantly above the broadband levels, it's usually subjectively better.
      2. Yes, we could make similar plots for other speeds and the frequencies would be different. By choosing 65 or 70 mph for the marketing data, we are showing the speed that people usually cruise at on the highway. It may be worth noting we look at speeds in increments of 5 mph to make sure the sound is ok over a range of speeds and not just one as represented by the marketing data.



      I hope that information helps! If you have any more questions, I'll do my best to answer!

      Thank you!
      GoAPR.com | Facebook | YouTube | Twitter | Instagram
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      10-11-2011 10:02 PM #37
      Quote Originally Posted by Arin@APR View Post
      Marty,

      I spoke with engineering for clarification on the questions you asked.


      1. Tones at very low frequencies have not been as much of an issue unless the engine is switching displacement. For the Audi, that will not matter until the new 4.0 TFSI is released with cylinder shutoff control. Another factor is the penetration of the tones above the broadband levels. Less penetration means the tones are less noticeable and multiple tones close to each other can actually be more pleasing to the ear. Our designs target the dominant tone around 100 - 130 Hz and usually increase the tones at lower frequencies (typical for resonators with tailpipes). If the tones are not significantly above the broadband levels, it's usually subjectively better.
      2. Yes, we could make similar plots for other speeds and the frequencies would be different. By choosing 65 or 70 mph for the marketing data, we are showing the speed that people usually cruise at on the highway. It may be worth noting we look at speeds in increments of 5 mph to make sure the sound is ok over a range of speeds and not just one as represented by the marketing data.



      I hope that information helps! If you have any more questions, I'll do my best to answer!

      Thank you!
      Thanks Arin! I'm definitely interested in seeing this sort of analysis on the TT-RS exhaust whenever it's available.

    13. 10-15-2011 04:53 PM #38
      hurry apr we need some chip action before winter time! i lost by a car length to a 997 turbo at the end of 4th, granted i did not launch the car and stupid traction control kicked in shifting from 1-2 but still

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      04-05-2012 04:01 PM #39
      Any updates?? It's been half a year since the last post!

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      04-05-2012 04:04 PM #40
      Quote Originally Posted by Marty View Post
      Any updates?? It's been half a year since the last post!
      Production is starting soon.

      I'm overly embarrassed it's taken this long.
      GoAPR.com | Facebook | YouTube | Twitter | Instagram
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      Address: APR LLC, 4800 US HWY 280 West, Opelika, AL 36801

    16. 04-05-2012 04:29 PM #41
      Thanks for the update.

    17. 04-05-2012 04:46 PM #42
      Quote Originally Posted by Marty View Post
      Any updates?? It's been half a year since the last post!
      Marty when you get this exhaust we need to have a south bay TT RS meet up. I am with you on the 2k drone. I'm used to it now, but it can get really F'in loud especially going up hill. E.g. Hwy 9. Usually I just leave the engine around 3k rpm to get rid of the noise.

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      04-05-2012 06:30 PM #43
      Quote Originally Posted by fjork_duf View Post
      Marty when you get this exhaust we need to have a south bay TT RS meet up. I am with you on the 2k drone. I'm used to it now, but it can get really F'in loud especially going up hill. E.g. Hwy 9. Usually I just leave the engine around 3k rpm to get rid of the noise.
      How about you buy it and then I'll come meet up at your area for a demo?

    19. 04-05-2012 06:35 PM #44
      If either one beats me to it and gets the exhaust installed first, I'll want a demo for sure.

      We should get together for a South Bay TT-RS meet-up either way, though.

    20. 04-06-2012 04:35 PM #45
      Quote Originally Posted by Marty View Post
      How about you buy it and then I'll come meet up at your area for a demo?
      Haha... touche. I'm going to spend money on some 18" wheels and autox/track tires first. I'm leaning toward the oem 18" wheels. I haven't seen any posts where anyone has gotten an aftermarket wheel with a stock fit.

      The exhaust would be the second upgrade I'd get depending on price.

    21. 04-06-2012 06:19 PM #46
      Quote Originally Posted by fjork_duf View Post
      Haha... touche. I'm going to spend money on some 18" wheels and autox/track tires first. I'm leaning toward the oem 18" wheels. I haven't seen any posts where anyone has gotten an aftermarket wheel with a stock fit.

      The exhaust would be the second upgrade I'd get depending on price.

      Did you find a source for the OEM 18's?
      I'd love a set as well!
      14 BRZ
      15 A3

    22. 04-06-2012 06:32 PM #47
      Quote Originally Posted by joneze93tsi View Post
      Did you find a source for the OEM 18's?
      I'd love a set as well!
      They can be obtained from europrice or oemplus. Prices seem to be very close. About $645 per wheel. Which I feel is a bit high, so I'm still shopping for alternatives.

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      07-08-2012 02:47 AM #48
      Quote Originally Posted by Arin@APR View Post
      Production is starting soon.

      I'm overly embarrassed it's taken this long.
      Starting soon, eh? And 3 months later.... ?

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      07-12-2012 01:37 PM #49
      Production already started. Waiting game.
      GoAPR.com | Facebook | YouTube | Twitter | Instagram
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      Address: APR LLC, 4800 US HWY 280 West, Opelika, AL 36801

    25. 07-12-2012 01:44 PM #50
      So will apr or borla ship an exhaust to a customer first?

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