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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

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    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. Thor

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    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 Tacoma offroad armor fabricating beast Vendor

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    Eric
    Eastern side of the Sierras, NV
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    Had tons on the Taco's.... new truck is pretty stock
    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

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    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

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    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. Thor

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    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

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    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. Thor

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    FlimFlubberJAM
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    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. :)
     
  9. Dec 2, 2008 at 7:34 PM
    #9
    roxspin72

    roxspin72 Enjoying my addiction

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    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. Thor

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    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

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    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. Thor

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    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

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    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. Thor

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    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

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    Thanks...
     
  16. Dec 24, 2008 at 5:23 PM
    #16
    Gadget@URD

    Gadget@URD Well-Known Member Vendor

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    Southern Maryland USA
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    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
     
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