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Exhaust System Upgrades

Discussion in 'Performance and Tuning' started by BLOCKADE, Apr 27, 2008.

  1. Jun 2, 2008 at 10:05 AM
    #21
    1killerkaw

    1killerkaw Well-Known Member

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    The header can be ported to match the diameter of the exhaust port. Most aftermarket headers are too small or they don't line up correctly and then you would port match the headers to the head.
     
  2. Jun 15, 2008 at 1:35 PM
    #22
    Johnny_knox69

    Johnny_knox69 Well-Known Member

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    How can we get more power from the Exhaust?

    Headers= How much performance

    Cat Back= How much more performance

    What about the cats? can they be removed? Modified(say if it were for off road use only) would the ad gain?

    I Don't care about sound, only GAINS
    I was thinking of getting a full exhaust(headers all the way back) and what ever it took with the Cats....off or on....What the hells is the best situation? :)


    Any pros on this subject!
     
  3. Jun 15, 2008 at 2:24 PM
    #23
    BLOCKADE

    BLOCKADE [OP] Well-Known Member

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    I'm not a pro, so take my advice for what it's worth.

    There are a lot of products out there. They all claim to have various increases in HP/Performance which vary from 5hp to 10 or 15hp.

    I personally don't see how you could get much gain from a new muff if you have the factory heads and intake still on. With just a basic understanding of the engineering behind engines, I would think you would need to have the same amount of diameter leaving the engine all the way back to really make a difference.

    I do think that removing the cats would help. Doing so would remove a lot of restriction, but again, if the muffler isn't high flow enough, it probably won't matter.
     
  4. Jun 15, 2008 at 3:19 PM
    #24
    danusa

    danusa Well-Known Member

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    I am just going to let the TRD exahust rust off and run straight SS pipes from the headers out the back and be done with it.
    I`ll have them bent behind the rear wheels so the gas does not annoy the tail gate op.
    That small 4.L six mill can`t make too much noise.
    I may preempt it. That is national policy now.
     
  5. Jun 15, 2008 at 6:14 PM
    #25
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    Best case for headers is about 8 h.p.

    Best case, about 7 h.p.

    Toyota cats flow rather well, you could get a couple of h.p. by loosing them.

    Exhaust gasses dont flow like a constant flow of air thru a pipe. They are pulses. Everytime the piston goes up in the stroke pushing the gasses out of the cilynder, it goes thru the exhaust as a "puff" of exhaust. In front of this pulse, is a positive pressure wave. Behind the pulse is a negative wave. The negative wave actually helps fill another cilynder with air ( or the same one, depending on the cycle timeing of the pistons) by creating a slight vaccume in the combustion chamber. If you speed or slow down this process by increasing the diameter of the pipe (allowing the gasses to cool to soon, thus slowing them down), or by reducing restrictions in the system, it affects the overall efficiency of the engine, altering how much of a "scavenging effect" the exhaust pulses have on the intake charge in the cilynder. By going with a higher flowing cat, and exhaust, and muffler, you may gain some h.p. in the upper rev. range, but you will loose power at the bottom. And vice versa. Too much restriction, and you loose on the top. I have found the best gains to be had with a quality header, stock cats, 1/4" increase in the dia. of the "Y" pipe, 2.5" pipe to and from a Dynomax Super Turbo muffler. This set up has shown a 1-2 h.p. gain to about 2000 rpm, 4-7 from there to 3500 rpm, and from 3500 to 5500 rpm a gain of 8 and a peak of almost 16 h.p.
    FWIW, Im working on an exhaust system that actually ovals out the pipes in the bends, very similar to this:
    http://www.hardracing.com/Exhaust%20Systems/MicronSerpent.htm
    Im thinking that it will keep exhaust velociy up, and without turbulance. A Mandrel bent pipe still has "hot spots" indicating turbulance in the bends. :)
     
  6. Jun 15, 2008 at 6:25 PM
    #26
    Johnny_knox69

    Johnny_knox69 Well-Known Member

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    Hey sounds realistic....... SO Why would someone want to spend 1000 bucks on headers/pipe/cats/muffler for a few horses?

    I don't want it for the sound.

    thanks


     
  7. Jun 22, 2008 at 12:00 PM
    #27
    4x4x4trd

    4x4x4trd My other ride weighs 200 tons

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    Good write-up. I have been looking at several pictures on this subject and seems to me that the stock Toyota exhaust would actually flow better than the aftermarket headers if it weren't for the front cat's. I have also read that Toyota cat's don't restrict that much at all.

    My question, does anybody make a aftermarket pipe connection off of the stock headers behind the front cat's, therefore removing the second cat's but still having a fitting for the sensors? This would eliminate one pair of cat's and run into the aftermarket muffler that I now have without throwing codes? Am I off on the way I'm looking at this?

    [​IMG]
     
  8. Jun 22, 2008 at 2:01 PM
    #28
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    If Im reading you correctly, check out URD. They have some good stuff. Check out the "pipe bomb". I think it is what you are looking for. :)
     
  9. Jun 22, 2008 at 2:35 PM
    #29
    BLOCKADE

    BLOCKADE [OP] Well-Known Member

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    FINALLY, Someone who knows what there talking about (or really sounds like they do ;)). Thank you for your input. You deserve some rep chris4x4.
     
  10. Jun 22, 2008 at 2:37 PM
    #30
    BLOCKADE

    BLOCKADE [OP] Well-Known Member

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    I have dumps on my '69 Camaro, I can really feel the difference when I take the flanges off... Sounds a LOT meaner too.
     
  11. Jun 22, 2008 at 2:57 PM
    #31
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    Thank you, my good man! :) In the last 11 years, I have learned alot about these trucks, what works, what doesnt, etc, and I have run many different mods on the dyno (70 or so runs on different vehicles), so I have a REALLY good idea of real world numbers, not seat-of-the-pants results. :D
     
  12. Jun 23, 2008 at 2:55 PM
    #32
    Brunes

    Brunes abides. Staff Member

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    Inside: Tint, Wet Okole 1/2 Piped Red/Black Covers, Black Weathertech Digital Fit Mats, URD Short Throw w/ TWM Weighted Knob, USA Spec iPod adapter. Outside: 4300K Retro w/ Angel Eyes and Red Shrouds, 5000K Blazer Fog Light Retrofit, Debadge, Bed Locking Handle, Satin Black Rims Performance: TRD/Steigmeier Blower w/ 2.7 Pulley. 668 Injectors and 320 LPH AEM Fuel pump. URD UCON and 7th Injector. DTLT Headers, URD Y-Pipe, Wicked Flow Muffler. Suspension: Both: OME Shocks Front: 886X's and TC UCAs Rear: Dakars Armor: Relentless Front Bumper Relentless High Clearance Rear w/ Tire/Rotopax Swing Out Relentless Front, Mid, and TCase skids BAMF Diff Skid Recovery and Spares: Fullsize Spare Tire 2x2 gal Rotopax 1x1 gal Rotopax 1x1 gal Water Rotopax Warn 9.5XP-S Winch Hi-Lift Extreme 60" Ironman Off-Road Recovery Kit Upcoming: ATO Gas Tank Skid and Sliders w/ kickout. ATO Shackle Flip Kit. Down the line: Front/Rear ARB Lockers w/ OBA. 4.56 Gears
    Someone might or might not do only those things. As soon as you get into the intake (Higher Flow Natual Aspiration or Force Induction), or any other modificiations (Valves, Cam Shafts, Weight Redux) you'll see the stuff chris was talking about- Different combinations work together REALLY well..and some are downright horrible.

    You have to figure out what you want the truck to do and then work all your mods together to get that in the end.
     
  13. Jun 25, 2008 at 12:59 PM
    #33
    95.5taco

    95.5taco Well-Known Member

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    air raid cold air intake, throttle body spacer, rear 2.5" add-a-leafs, downey headers, dynomax ultroflo muffler,new carbon fiber tail lights, warn transformer grille guard, Alpine mp3 player,Kicker competition speakers. Rancho 5000 shocks
    if you can try to buy hearders, exhaust etc, not from TRD, they are a big waste of money for items you can buy elsewhere, for instance, gibson, downey and a few others make headers for half the price, and mbrp makes a sweet dual exhaust kit for cheaper than borla...shop around, also keep in mind what you have for an intake will help out lots
     
  14. Jun 27, 2008 at 9:52 AM
    #34
    4x4x4trd

    4x4x4trd My other ride weighs 200 tons

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    Thanks Chris that's what I was looking for. But at $300 + for a couple HP I'll have to leave it alone. :eek:
     
  15. Jun 27, 2008 at 5:00 PM
    #35
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    Any decent exhaust shop should be able to make you a nice "Y" pipe for a couple hundred dollars. A guy in AZ got a full Y-pipe back, 3" with a Flowmaster :)rolleyes:), for under $300.00. Just call around. :)
     
  16. Jul 17, 2008 at 7:38 PM
    #36
    Brunes

    Brunes abides. Staff Member

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    This thread is as good as any- I guess I'll throw this out there. Has anyone found a cat-back or full set up (non custom) that dumps out in front of the rear tire insted of behind it??

    I'm thinking that in the next few months I'm going to get a set of DT Headers, the URD Y-pipe, and a MBRP tail, unless I can find an exhaust that goes out in front of the time. (I'll be getting the URD TCAI too)
     
  17. Jul 17, 2008 at 8:15 PM
    #37
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    I thought that Gibson makes one like that. Check with them. I think its called the "Side Swept" exhaust.
     
  18. Jul 23, 2008 at 7:28 PM
    #38
    cajun1_us

    cajun1_us Member

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    just curious if anyone has tried to use an "x" pipe from cats to duel mufflers? If so how was sound and performance. I have a muffler shop that tells me they can probably do this for me.
     
  19. Jul 23, 2008 at 7:44 PM
    #39
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    I have only used an "X" pipe to replace an "H" pipe. Give it a shot and report back. :)
     
  20. Jul 27, 2008 at 9:46 AM
    #40
    danusa

    danusa Well-Known Member

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    TRD does not make headers.



     
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