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    VWVortex


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    Thread: vr engine bay pics...lets see 'em

    1. 06-24-2010 02:06 PM #71
      Quote Originally Posted by vr6pilot View Post
      A turbo drag car isn't a daily driver and doesn't have to contend with noise ordinances nor cabin drone and therefore not a suitable nor relevant reference.
      i was using that example to make the point that the exhaust part that runs under the car however long it may be doesn't have much to do with turbo car performance unless its further restricting exhaust flow.

      its different then a na setup which requires a certain amount of back pressure to make power.

    2. Member vr6pilot's Avatar
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      06-24-2010 04:07 PM #72
      Okay.

      But...while we're nuggin' out the details. An NA car doesn't require "back pressure" as you put it. Common misconception. So to help make vortexers smarter than the average bear...

      ...the true tuning element in an NA exhaust setup is exhaust flow and velocity where the engineering target is to keep the spent gasses moving outward rather than allowing them to slow, stop, or reverse direction even momentarily. Higher velocity exhaust movement is more resistant to such unwanted flow reversal and can even help pull the next burst of spent gases along. This is the design principal behind your typical header. On an NA engine, tuning the exhaust system usually means having a target rpm in mind where peak efficiency is desired. In small displacement engines, the target rpm range is usually higher where the engine needs to spin to make it's best power output but low-rpm power usually suffers. On large displacement engines, the torque band is so large that finding the sweet spot for exhaust tuning is much easier and tends to be biased lower in the rpm range. But anyway, exhaust gas velocity is higher with smaller diameter tubing. This works great in the lower rpm range where the gases are better scavenged by the collectors but as rpm rises and exhaust gas volume increases, the smaller diameter pipe becomes a restriction to flow and "top-end" performance suffers. Opening up the pipe to allow for better flow at high rpm reduces the velocity of the gases at lower rpm and can allow the unwanted stoppage or reversal of gas flow making it harder for the next exhaust pulse to exit the combustion chamber and certainly not helping it out. This can cause the car to run like poo in the rpm range where most of the 'daily' driving is done. This association between exhaust pipe size and engine behaviour leads many to think, in the simplest terms, that the engine is performing better due to the increase in back pressure.

      Break for recess.

    3. Member DUBZAK's Avatar
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      06-24-2010 04:19 PM #73
      you could have just told him to search for "scavenging effect"

      And I run a 3" on N/A for the haters.
      Last edited by DUBZAK; 06-24-2010 at 05:17 PM. Reason: I cant spell and was corrected...
      |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

    4. Member vr6pilot's Avatar
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      06-24-2010 05:13 PM #74
      He would have found nothing. Its "scavenging". I grow weary of this discussion. MOAR PICZ!!

    5. Member Boost112's Avatar
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      06-24-2010 05:19 PM #75
      Quote Originally Posted by DUBZAK View Post

      And I run a 3" on N/A for the haters.
      ...quick review? im interested....
      --- SPACE FOR RENT---

      Quote Originally Posted by schwartzmagic View Post
      Those VRTs are so full of win :-D

      www.dubcartel.net

    6. 06-26-2010 11:26 AM #76
      I ran full 3" from the dowpipe back on my n/a motor went like a raped ape too

    7. 06-27-2010 05:29 PM #77
      A modest contribution...

    8. Member V-dubbulyuh's Avatar
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      06-27-2010 08:03 PM #78
      Nice 'n clean.

    9. Member Doze13's Avatar
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      06-27-2010 10:37 PM #79

    10. Member vr6pilot's Avatar
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      06-28-2010 12:33 PM #80
      Sad I gotta jack someone else's pics to keep this thread going... this one's amost stock:


    11. Member vr6pilot's Avatar
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      06-29-2010 12:04 AM #81
      here's another I just happened upon...


    12. Member Soundwave_vr6's Avatar
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      06-29-2010 08:51 AM #82



    13. Member DUBZAK's Avatar
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      06-29-2010 08:07 PM #83
      |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

    14. Member .:13's Avatar
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      06-30-2010 12:50 AM #84
      Quote Originally Posted by Soundwave_vr6 View Post


      Is this pic from Motorstadt 7???

    15. Member Soundwave_vr6's Avatar
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      06-30-2010 08:23 AM #85
      yup i came over from Ontario

    16. Member IdontOwnAVW's Avatar
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      06-30-2010 02:44 PM #86
      My engine bay as it sits right now, no idea why I left the plug wires in there. They're out now though so its all good haha.



      Theres been progress since then but its been minor...wiring harness is out of the way and all I need to do is undo the axles and downpipe from the cat and out she goes.
      LOL MPG
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    17. Member VixenUNBREAKABLE's Avatar
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      06-30-2010 06:09 PM #87
      This thread.

      Here's my turd... Battery relocation soon.

    18. Member quadcammer32's Avatar
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      06-30-2010 11:24 PM #88
      35R, schimmel, tail 4" inch exhaust. it does the job



      in this


    19. Member V-dubbulyuh's Avatar
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      07-01-2010 12:48 PM #89
      Real nice. How much boost your running? What is the spool like with the 4"?

    20. Member vr6pilot's Avatar
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      07-01-2010 01:48 PM #90
      Interesting one...

    21. Member vr6pilot's Avatar
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      07-01-2010 01:55 PM #91

    22. Member vr6pilot's Avatar
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      07-01-2010 02:05 PM #92

    23. Member vr6pilot's Avatar
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      07-01-2010 02:16 PM #93
      You can tell where I've been trollin'....


    24. Member Scotty_2.0's Avatar
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      07-01-2010 03:27 PM #94
      I know it's a little lacking right now, but just for kicks...... (check my sig for progress)

      /// VRSociety Member #298 /// bankrupt ///

    25. Member vr6pilot's Avatar
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      07-01-2010 05:02 PM #95
      Well, the OP wanted engine bay pics...didn't say nuthin about it having to have the engine innit.

      This is one sweet Mk3 under the bonnet! >>


    26. Member V-dubbulyuh's Avatar
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      07-01-2010 06:54 PM #96
      Quote Originally Posted by vr6pilot View Post
      You can tell where I've been trollin'....


      Interesting, have not seen the MSD's relocated to the pass side before.

    27. Member quadcammer32's Avatar
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      07-01-2010 07:11 PM #97
      Quote Originally Posted by V-dubbulyuh View Post
      Real nice. How much boost your running? What is the spool like with the 4"?
      im only runnin 15lbs now. the car pulls HARD. it spools fine

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      07-01-2010 09:39 PM #98

    29. Member vr6pilot's Avatar
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      07-02-2010 01:59 PM #99
      more today...

    30. Member vr6pilot's Avatar
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      07-02-2010 02:20 PM #100
      Last edited by vr6pilot; 07-02-2010 at 04:20 PM. Reason: better picture

    31. Member vr6pilot's Avatar
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      07-02-2010 02:22 PM #101
      moar...

    32. Member vr6pilot's Avatar
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      07-02-2010 03:04 PM #102

    33. Member vr6pilot's Avatar
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      07-02-2010 03:07 PM #103

    34. Member vr6pilot's Avatar
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      07-02-2010 03:44 PM #104
      Tidy...

    35. Member .:13's Avatar
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      07-08-2010 09:40 PM #105
      bumpage

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