1. Welcome to Tacoma World!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tacoma discussion topics
    • Communicate privately with other Tacoma owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

3inch exhaust pipe too big?

Discussion in 'Performance and Tuning' started by dabighi, Dec 2, 2008.

  1. Dec 2, 2008 at 6:06 PM
    #1
    dabighi

    dabighi [OP] Well-Known Member

    Joined:
    Oct 8, 2007
    Member:
    #2978
    Messages:
    170
    hey question. im looking at urd exhaust and i noticed that its a 3" tube. it also says that you lose a little of the lower end power. so i was wondering if 2.75"tubing would help air flow out without losing too much bottom end and brake assist?
     
  2. Dec 2, 2008 at 6:09 PM
    #2
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

    Joined:
    May 8, 2008
    Member:
    #6497
    Messages:
    112,751,503
    Gender:
    Male
    First Name:
    FlimFlubberJAM
    Tenoe, AZ
    Vehicle:
    2019 Rubicon 4 Door,
    4.10 gears, sliders, and lots of buttons.
    Best results would be had with a 2.5" "Y" into a 2.5" mandrel bent all the way back, with a Dynomax Super Turbo muffler in between. :)
     
  3. Dec 2, 2008 at 6:22 PM
    #3
    RelentlessFab

    RelentlessFab Eric @Relentless Fab Vendor

    Joined:
    Feb 17, 2008
    Member:
    #4772
    Messages:
    15,719
    Gender:
    Male
    First Name:
    Eric
    Sparks, NV
    Vehicle:
    07 AC 6mt>03 SR5 >08 Sport and 17 6MT TRD OR
    Relentless Armored! Too many others to list.
    i've heard 3" is too much for the v6, and more for a v8. i've got a JBA cat back that i bought from URD and its 2.5" mandrel bent SS tube. I love it.
     
  4. Dec 2, 2008 at 6:24 PM
    #4
    tacoskim

    tacoskim Tuned By Gadget

    Joined:
    Mar 13, 2008
    Member:
    #5252
    Messages:
    2,378
    Gender:
    Male
    Los Angeles, CA
    Vehicle:
    09 TRD 4x4 Pyrite Mica
    Stock
    youll benefit the most out of the 3 inch if you decide to supercharge ur truck, if not, stick to the stock diameter
     
  5. Dec 2, 2008 at 6:31 PM
    #5
    silver07taco

    silver07taco Well-Known Member

    Joined:
    Apr 27, 2008
    Member:
    #6241
    Messages:
    4,541
    Gender:
    Male
    First Name:
    COIL
    Maryland
    Vehicle:
    13 Tundra RCSB 5.7 4x4,07 Tacoma AC 4.0 4x4
    2013 Tundra RCSB 5.7 4x4, 2007 Tacoma AC 4.0 4x4
    I have 3'' pipe out a 4'' tip on mine I havent had any problems
     
  6. Dec 2, 2008 at 6:45 PM
    #6
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

    Joined:
    May 8, 2008
    Member:
    #6497
    Messages:
    112,751,503
    Gender:
    Male
    First Name:
    FlimFlubberJAM
    Tenoe, AZ
    Vehicle:
    2019 Rubicon 4 Door,
    4.10 gears, sliders, and lots of buttons.
    You wont have any problems. It will run fine. You just lost some low end h.p. and torque.
     
  7. Dec 2, 2008 at 6:47 PM
    #7
    silver07taco

    silver07taco Well-Known Member

    Joined:
    Apr 27, 2008
    Member:
    #6241
    Messages:
    4,541
    Gender:
    Male
    First Name:
    COIL
    Maryland
    Vehicle:
    13 Tundra RCSB 5.7 4x4,07 Tacoma AC 4.0 4x4
    2013 Tundra RCSB 5.7 4x4, 2007 Tacoma AC 4.0 4x4
    I dont think I have, it must be very little loss
     
  8. Dec 2, 2008 at 6:58 PM
    #8
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

    Joined:
    May 8, 2008
    Member:
    #6497
    Messages:
    112,751,503
    Gender:
    Male
    First Name:
    FlimFlubberJAM
    Tenoe, AZ
    Vehicle:
    2019 Rubicon 4 Door,
    4.10 gears, sliders, and lots of buttons.
    Read my thread on "How air flows thru an engine". I cant count how many exhausts I have made, and dynoed. Trust me. Sometimes the loss is off set by the feeling of a gian on the top end. For example. A buddy and I built an exhaust for his truck. He wanted big, despite my saying otherwise. After it was installed he felt "Huge" increase in h.p.. Well, 2 weeks later, we thru it on the rollers. It made 10+ h.p. LESS on the bottom, only to make 3 peak h.p. more on the top. Also, on another friends 2001 Firebird Trans Am WS6 with the LS 1 5.7 (which came stock with two 2.5" exhaust pipes) we made a 2 into 1 system useing 3" pipe, all the way back, and a 3" in/out Dynomax muffler. It made 15 h.p. more than stock. The lowest gain was 3 h.p. and it climbed until the peak. When the h.p. dropped, it was STILL 10 h.p. more than stock. The point Im trying to make is you cant just think "Bigger is better" when it comes to exhaust. There is more to it than just getting hot burned stuff out from under the truck. :)
     
    Roostfactor likes this.
  9. Dec 2, 2008 at 7:34 PM
    #9
    roxspin72

    roxspin72 Enjoying my addiction

    Joined:
    Feb 9, 2008
    Member:
    #4659
    Messages:
    1,829
    Gender:
    Male
    NC
    Vehicle:
    Speedway Blue, TRD, 4X4,
    Oh Yeah!!!
    Hey chris, is the Dynomax straight threw or chambered. I got the Borla cat back, and want to know what different specs the Dynomax has if any. Thinking a little more back pressure can help out.

    Currently got JBA Headers, URD Y-pipe, & Borla Cat back

    Will soon run DT Long tubes, " " " " "

    What you think???
     
  10. Dec 2, 2008 at 7:45 PM
    #10
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

    Joined:
    May 8, 2008
    Member:
    #6497
    Messages:
    112,751,503
    Gender:
    Male
    First Name:
    FlimFlubberJAM
    Tenoe, AZ
    Vehicle:
    2019 Rubicon 4 Door,
    4.10 gears, sliders, and lots of buttons.
    Its not about "back pressure", its all about exhaust scavenging.
    The Dynomax mufflers I have seen have all been straight thru. The JBA headers flows quite well, and I "think" with the DT long tubes you may see a loss of low rpm power. Until about 3000 rpm or so. Maybe less. I havent had a chance to see the DT's on a dyno, but I have seen many of the same design. Personally, I think the system you have now would be hard to improve upon.
     
  11. Dec 2, 2008 at 7:53 PM
    #11
    roxspin72

    roxspin72 Enjoying my addiction

    Joined:
    Feb 9, 2008
    Member:
    #4659
    Messages:
    1,829
    Gender:
    Male
    NC
    Vehicle:
    Speedway Blue, TRD, 4X4,
    Oh Yeah!!!
    Agree...

    I love the sound and the power, just hate the leak I have at the Header flange. JBA is hit and miss. I've heard great things about DT Long tubes from power, sound, to quality. I am ready to loose a couple ponies on the low end, if It can be made up by a complete exhaust system that will last..

    Hey if anyone got bad vibes about DT's please post. I'm about 60 days out from a $500 purchase. Share the good or bad experiences.

    Thanx:D
     
  12. Dec 2, 2008 at 7:56 PM
    #12
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

    Joined:
    May 8, 2008
    Member:
    #6497
    Messages:
    112,751,503
    Gender:
    Male
    First Name:
    FlimFlubberJAM
    Tenoe, AZ
    Vehicle:
    2019 Rubicon 4 Door,
    4.10 gears, sliders, and lots of buttons.
    FWIW, silver06TRD has the DT long tubes and he has been fighting leakes also. He recently found a gasket that works, and has been leak free sinse the last time I talked to him ( maybe a week?). Just find a gasket that works, or have them welded.
     
  13. Dec 2, 2008 at 8:02 PM
    #13
    roxspin72

    roxspin72 Enjoying my addiction

    Joined:
    Feb 9, 2008
    Member:
    #4659
    Messages:
    1,829
    Gender:
    Male
    NC
    Vehicle:
    Speedway Blue, TRD, 4X4,
    Oh Yeah!!!
    You know, this only started when I took them off and had to reinstall w/stock gaskets, purchased at dealer. "suck!!!. You think the gaskets make that much a diff. I was running some brand that JBA sent me. Got some cloth touch to it, but they were all out at time of install.
    \\

    Worried cause the gap is noticeable, and with stethescope that leak is obvious. And I know that this affects my tuning some due to more O2 entering right before my wideband sensor...:mad:
     
  14. Dec 3, 2008 at 4:56 AM
    #14
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

    Joined:
    May 8, 2008
    Member:
    #6497
    Messages:
    112,751,503
    Gender:
    Male
    First Name:
    FlimFlubberJAM
    Tenoe, AZ
    Vehicle:
    2019 Rubicon 4 Door,
    4.10 gears, sliders, and lots of buttons.
    Yeah. Try to get the ones that JBA recomends. The joint between the header and cat is a bit different than with the stock manifold. get some extras if you can, just in case this pops up in the future. :)
     
  15. Dec 3, 2008 at 8:14 PM
    #15
    roxspin72

    roxspin72 Enjoying my addiction

    Joined:
    Feb 9, 2008
    Member:
    #4659
    Messages:
    1,829
    Gender:
    Male
    NC
    Vehicle:
    Speedway Blue, TRD, 4X4,
    Oh Yeah!!!
    Thanks...
     
  16. Dec 24, 2008 at 5:23 PM
    #16
    Gadget@URD

    Gadget@URD Well-Known Member Vendor

    Joined:
    Sep 12, 2008
    Member:
    #9183
    Messages:
    695
    Southern Maryland USA
    Vehicle:
    URD Supercharged XRunner
    Don't worry about loosing any power with the URD Exhaust products on the 1GR.

    Here is a dyno chart:

    [​IMG]

    Test vehicle is a 2005 XRunner on a DynoJet dyno.

    The blue line is a COMPLETELY STOCK vehicle.

    The Green line is adding the URD Y pipe and 3" cat-back.

    The red line is adding the URD TCAI to the Y pipe and Cat-back.

    [​IMG]

    The above dyno chart is the URD TCAI only with all else stock got 18 RWHP on the same truck.

    Order them up boys!!

    Gadget
     
  17. Mar 7, 2018 at 12:20 AM
    #17
    Blue2010

    Blue2010 Active Member

    Joined:
    Dec 22, 2017
    Member:
    #239124
    Messages:
    35
    Gender:
    Male
    Vehicle:
    2013 tacoma double cab sport 4x4
    Would like to see a dyno completely stock vs a dyno chart with only the catback installed
     
  18. Mar 7, 2018 at 8:46 AM
    #18
    vasinvictor

    vasinvictor Junkie

    Joined:
    Sep 23, 2014
    Member:
    #138933
    Messages:
    875
    Gender:
    Male
    First Name:
    Drew
    Arkansas
    Vehicle:
    '01 DCSB racetruck
    hx35 turbo, AEM F/IC, Transgo, custom converter, CalTracs, Elocker, 2-4" drop, 4x4 conversion (2023) on a new purple powdercoated fram, 255/55r18 street, 255/60r16 M&H Racemasters, 7.6 at 91
    Bro, you just bumped a 10 (TEN) year old thread. Dynos exist- try searching
     
    Brice likes this.
  19. Mar 7, 2018 at 8:50 AM
    #19
    Blue2010

    Blue2010 Active Member

    Joined:
    Dec 22, 2017
    Member:
    #239124
    Messages:
    35
    Gender:
    Male
    Vehicle:
    2013 tacoma double cab sport 4x4
    I’ve seen many dyno threads but haven’t seen one yet comparing a completely stock dyno vs just with the 3” urd cat back
     
  20. Mar 16, 2018 at 10:38 AM
    #20
    Brice

    Brice Turbo Member

    Joined:
    May 28, 2015
    Member:
    #156265
    Messages:
    2,210
    Gender:
    Male
    First Name:
    Brice
    Texas
    Vehicle:
    1999 Tacoma PreRunner V6 SR5
    Wastegate assisted turbo delete
    Gadget doesn't even log on to TW anymore lol. You'll have better luck finding a dyno elsewhere.
     

Products Discussed in

To Top