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    Thread: Vr6 exhaust dyno: 2.5" vs 3" back to back.

    1. Moderator root beer's Avatar
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      07-29-2010 07:35 PM #1
      First off, Kurtis@MBSP sponsored this test. He is deserving of the credit here. I am merely reporting because i am a superstar.

      We went to Charm City Tuning this afternoon, super hot and humid. They've got a dynojet in house there. Strapped it down.

      Setup:
      170k block
      mk4 hg
      7lb flywheel and light crank pulley
      home ported head, and competition valve job
      2.9 clone upper intake
      Autotech intake
      Schrick 268's
      Ported exhaust manfolds
      2. 5" TT with Borla with 42dd testpipe

      The best pull was 197whp

      Next, we backed the car off the dyno, and Kurtis threw on the 3" setup that is available in the classifieds. Kurtis@MBSP

      The best pull with this exhaust was 204whp. This gain was the whole powerband, and 7whp at peak. It also helped churn a couple lbs of torque across the entire powerband, and 5ft/lbs at peak.

      I now run a 3" aluminum, single muffler system made by Kurtis

      Cliffs:
      -A mildly modified VR will see mild gains from a 2.5" to 3" exhaust. If you're planning on modding the motor to anything more than bone stock, it might make sense to just buy the 3" system off the bat.
      -You 2.25" lovers are wrong. I just pooped on your 'low end torque'.
      -Don't be scared.




      Last edited by root beer; 02-16-2011 at 09:39 AM.

    2. Member rlsib16's Avatar
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      07-29-2010 07:40 PM #2

    3. Moderator root beer's Avatar
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      07-29-2010 08:41 PM #3

    4. Member son of planrforrobert's Avatar
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      07-29-2010 08:47 PM #4
      SUPERSTARRRRRRRRRRR

      Get well soon cutie
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    5. Member yellowrocco87's Avatar
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      07-29-2010 08:50 PM #5
      Super big thanks to Tim (aka Rootbeer) for letting us use his car for this test. With out him none of this would even be possible. So i can't thank you enough man. Also i'd like to thank all the guys up at Charm City Tuning for letting us use the dyno after hours. Mike, Jeff, Beavis, John thanks again guys

      To say we're happy with the results would be an exact understatement of how i feel right now. it was great. I'm just so glad that now There is with out a doubt proof that a 3" system on a mildly modded N/A VR6 picks up power over your more common 2.5" TT system. Like tim had posted dyno graphs will be available for posting tomorrow.


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      07-29-2010 09:46 PM #6
      good stuff gents.

    7. Member dawgpound's Avatar
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      07-29-2010 09:53 PM #7
      sweet. im running a 3in in my set up and love it. good to see the proof.

    8. Member dubsnmotion's Avatar
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      07-29-2010 09:54 PM #8
      thank you

    9. Member ruck's Avatar
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      07-29-2010 09:57 PM #9
      good stuff

    10. Moderator root beer's Avatar
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      07-29-2010 09:58 PM #10
      Quote Originally Posted by dawgpound View Post
      sweet. im running a 3in in my set up and love it. good to see the proof.
      Yea man. Now i'm getting my aluminum system built

    11. Member DUBZAK's Avatar
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      07-29-2010 09:59 PM #11
      This is good news.

      Can't wait for the graphs.
      |Corrado SLC 2.9LVR6|Corrado Keyless Entry | A8 "Grape Ape" | SPOONFEDTUNING |FOURSEASONTUNING|DUBNUTZ|
      Quote Originally Posted by pileofredparts View Post
      Do you guys remember the time that Ryan kid started mixing and matching rods and end caps and then his motor wouldnt turn over? I do

    12. Moderator root beer's Avatar
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      07-29-2010 10:42 PM #12
      videos are up. Not the final pulls, but they're videos.

      I'm the sexy one with the hand splint.
      Last edited by root beer; 07-29-2010 at 10:46 PM.

    13. Member VR JC's Avatar
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      07-29-2010 10:48 PM #13
      for our black all motor vr's

    14. Member rlsib16's Avatar
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      07-29-2010 11:19 PM #14
      nice sound there. what you do to your hand bud?

    15. Moderator root beer's Avatar
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      07-29-2010 11:43 PM #15
      I was taking the trans out of my new tacoma last night, and a bolt let loose, banged my thumb knuckle open on it. Went right to bone. I looked at it, and ****ing passed out in the shop in a puddle of water.

      Partially cut tendon, hand surgeon tomorrow.

      This is so amazingly inconvenient. I was ready to go run a ****in number tomorrow.

    16. Member Grits 'n gravy's Avatar
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      07-29-2010 11:55 PM #16
      Man you had that thing screaming.

    17. Member BHCfarkas's Avatar
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      07-30-2010 12:00 AM #17
      Much appreciate the useful information.. now the 2.5 an 3" debate can be put to rest.
      Instagram -> @farklefitment
      Quote Originally Posted by patrickvr6 View Post
      ...cretinx tried to touch on this point above but if you check his post history it is fairly easy to tell that he is an imbecile. I have doubts that he can drive a nail, much less a car.

    18. Member Andras.R's Avatar
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      07-30-2010 02:53 AM #18
      Once again, nice work What are your impressions about the difference in exhaust note?
      ps. its was hard to tell with the sound quality of the video..
      Last edited by Andras.R; 07-30-2010 at 04:15 AM.

    19. Moderator root beer's Avatar
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      07-30-2010 08:38 AM #19
      The 3" def has more bite to it.

    20. Member Harris_Teeter's Avatar
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      07-30-2010 09:11 AM #20
      Good to know.

    21. Member vdubxcrew's Avatar
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      07-30-2010 09:20 AM #21
      What exactly was included in the MBS kit when you dyno'd? Test pipe, no resonator to magnaflow muffler?

    22. Member skydaman's Avatar
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      07-30-2010 09:26 AM #22
      Quote Originally Posted by yellowrocco87 View Post
      I'm just so glad that now There is with out a doubt proof that a 3" system on a mildly modded N/A VR6 picks up power over your more common 2.5" TT system
      Joe @ Tempest did this test years ago...

      Cool you guys backed up the results though.

    23. Moderator root beer's Avatar
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      07-30-2010 10:08 AM #23
      Quote Originally Posted by vdubxcrew View Post
      What exactly was included in the MBS kit when you dyno'd? Test pipe, no resonator to magnaflow muffler?
      Yea, just a magnaflow.

    24. Member LA7VJetta's Avatar
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      07-30-2010 10:22 AM #24
      Schweet

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      07-30-2010 12:09 PM #25
      It seems unrealistic that a car with 199whp would benifit from the same size exhaust you'd run on a 400whp vrt car.
      "Yeah, I pissed myself, but that's only because I only had 20 minutes for recess." Duane Peters

    26. Member yellowrocco87's Avatar
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      07-30-2010 12:24 PM #26
      Quote Originally Posted by skydaman View Post
      Joe @ Tempest did this test years ago...

      Cool you guys backed up the results though.


      well no one ever saw the results of his test except for a very few people skyle so we took it upon our selves to see what would happen if we did this.

    27. Member V-dubbulyuh's Avatar
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      07-30-2010 12:58 PM #27
      This is good stuff.

    28. Moderator root beer's Avatar
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      07-30-2010 12:59 PM #28
      Quote Originally Posted by 976-RADD View Post
      It seems unrealistic that a car with 199whp would benifit from the same size exhaust you'd run on a 400whp vrt car.

      Even when my car making 199whp busts ass on 400hp vrt's?

      Really though, this is pretty typical of other makes.

    29. Member skydaman's Avatar
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      07-30-2010 02:28 PM #29
      Quote Originally Posted by 976-RADD View Post
      It seems unrealistic that a car with 199whp would benifit from the same size exhaust you'd run on a 400whp vrt car.
      This is whats wrong with import drag racing...

      Quote Originally Posted by yellowrocco87 View Post
      well no one ever saw the results of his test except for a very few people skyle so we took it upon our selves to see what would happen if we did this.
      True it was on the DSD site that is long gone.

    30. Moderator root beer's Avatar
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      07-30-2010 03:11 PM #30
      It might be what's wrong with import modification as a whole. Too much internet, too much unfound logic, too much bench racing. No real world testing.

      Things like:
      -small cams are good for boost
      -restrictive exhaust systems are needed for "back pressure"
      -cai's don't make power
      -20w50 is good for a vw

    31. Member son of planrforrobert's Avatar
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      07-30-2010 03:14 PM #31
      Quote Originally Posted by root beer View Post
      -20w50 is good for a vw
      Support your Local 81

    32. Member LA7VJetta's Avatar
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      07-30-2010 03:32 PM #32
      Quote Originally Posted by root beer View Post
      It might be what's wrong with import modification as a whole. Too much internet, too much unfound logic, too much bench racing. No real world testing.

      Things like:
      -small cams are good for boost
      -restrictive exhaust systems are needed for "back pressure"
      -cai's don't make power
      -20w50 is good for a vw

      when in reality

      Big cams> small cams
      wide open large exhaust is good for power
      CAIs make a decent boost in power


      but that is true about the oil, for a 8V anyway.

    33. Moderator root beer's Avatar
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      07-30-2010 03:34 PM #33
      My 8v runs on piss and vinegar.

    34. Member son of planrforrobert's Avatar
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      07-30-2010 03:36 PM #34
      I thought it ran on wailing guitar solos and Star Wars references?
      Support your Local 81

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      07-30-2010 03:36 PM #35
      Quote Originally Posted by 976-RADD View Post
      It seems unrealistic that a car with 199whp would benifit from the same size exhaust you'd run on a 400whp vrt car.
      Quote Originally Posted by skydaman View Post
      This is whats wrong with import drag racing...

      Care to elaborate?
      "Yeah, I pissed myself, but that's only because I only had 20 minutes for recess." Duane Peters

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