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Thread: Exhaust systems for 150's which is best?

  1. #106
    Senior Member
    Join Date
    Jun 2010
    Location
    Gippsland, VIC
    Posts
    457
    would like to see a dyno before and after with just muffler replaced and then one with a bigger exhaust compared to standard.

    For those with a 2010 model, my 2012 went better better than my 2010 model. If you haven`t had the auto upgrades and ecu upgrade done, might be worth checking in to make sure you are running the latest auto and engine programs.
    stepped up the a 200 LC for towing,
    but had a 2012 and 2010 150 Prado GXL auto diesel in Graphite with Bridgestone D697 A/T. Dobinson C59-300/325 and Bilsteins. Accessories : two baby seats. Sidewinder`s Dual Battery isolator and rear power outlet kit. Pirana Battery tray, Hayman Reese towbar with Toyota wiring kit and Brains`s guard.

  2. #107
    sorry if this is a dumb question but from reading this thread the redback muffler only seems to be a good way to go? is this correct?

    If so can i get the muffler and fit it directly to the existing system? If so whats the part no.

    Also does this increase the turbo whistle? anything moving toward a mack truck 'spooling up' sound would be nice....
    2013 (12 build) GX Auto.......with safari snorkel, toyota bar, tow bar, roof racks, led spots with fancy newpro switchgear, uniden remote UHF and aerial, ARB bash plates, Roadsafe recovery points, digoptions radio, general grabber AT2s, cheap ebay roof rack that has stood up surprisingly well.....

  3. #108
    Quote Originally Posted by MelbournePark View Post
    I have read this thread, and am confused by those that say that a wider exhaust will create less back pressure (true) but that will lower torque.

    In a turbo, lowering back pressure ie behind the turbo exhaust - will allow the turbo to spin faster, hence increasing torque, since the turbo will operate at higher RPMs hence pushing in more air into the motor.

    However ... how does the diesel know how much fuel to push into the motor? EFI system often read the air flow going into the motor ... does the D4D sence the air flow into the motor? I presume it must, hence why a D4D operates well in high altitudes.
    The engine management knows the correct boost and monitors it, putting a bigger exhaust won't do jack as the computer will adjust the boost to suit. If it can't control the boost it will throw an engine light.

    Big exhaust will help the engine breath easier and may improve response and pickup but peak power and torque won't change while the computer is in full control.

    Once you remap the computer, best done with a programmable chip or if possible complete refresh of the entire onboard computer with new boost and fuel settings to take advantage of the easier breathing. Obviously done on a dyno.

    An exhaust on its own will improve the turbo response, but not its peak output with comprehensive engine management.
    -=2014 GXL D4D Auto Graphite, Tow Bar, Roof Bars, ARB/D34 Dual Battery=-

  4. #109
    Junior Member
    Join Date
    Feb 2015
    Location
    Mount Isa, FNQ
    Posts
    39
    Slighlty off topic, but to answer re how diesels know how much fuel, Isn't there a MAF sensor and a MAP sensor?
    MAF is the 'Mass air flow' which is located just after ther airbox and is simply a temperature dependant resistor to calculate volume and density.
    'Manifold absolute pressure', or MAP, is found just before the manifold splits to each individual cylinder. It takes another reading of the density of the charged air after the turbo and intercooler because it is cooler, hence denser, and thus controls fuel input and EGR system (which is mixed into charged air). This is partly why physically blocking EGR can throw codes.

    Correct me if i'm wrong there.
    Last edited by Early; 02-03-2015 at 12:23 AM. Reason: slightly off topic

  5. #110
    I'm not exactly experienced with this kinda thing, but am looking to get a bit more punch out of her, and bang for buck a high flow muffler and cat seems the best option.

    Is fitting a high flo muffler and cat something that's easy to do at home? Are they just bolt in, or do they need to be cut and welded?

    If there are bolt in options, is anyone who has done these mods able to provide part numbers? Been looking around on the net, but not finding much.
    2011 Prado GX D4D Auto White

  6. #111
    Advanced Member
    Join Date
    Feb 2014
    Location
    Ipswich, Qld
    Posts
    577
    You would be lucky to find anything bolt in, I would say impossible. It's weld in, any good exhaust shop should be able to help you out for not too much coin
    Silver 150 Facelift
    TJM Bullbar, Lightforce Genisis Spots, Dual Battery System with bits from everyone, Powerful 4x4 slider/steps, Kaymar rear bar, "Genuine" Roof Racks, MSA Seatcovers, Dashmat, Tint, LED Interior Globes, Bridgestone D697s

  7. #112
    Junior Member
    Join Date
    Feb 2015
    Location
    Mount Isa, FNQ
    Posts
    39
    anybody tried ScottsRods exhausts?

  8. #113
    Advanced Member
    Join Date
    Feb 2014
    Location
    Ipswich, Qld
    Posts
    577
    Quote Originally Posted by Early View Post
    anybody tried ScottsRods exhausts?
    Sure have, on my old cruiser I had a full exhaust including extractors done by Scott, mate has full exhaust including extractors done by Scott on his petrol cruiser, dad has a Scott's exhaust on his turbo cruiser. Any exhausts we do through work are done through Scott. His workmanship is very good value for money, he can do anything from standard exhausts right through to show car quality. Waiting for my bank account to catch up with me then the mighty Prado will be going in to get one on too. He is local to me, so even though I am capable of fitting it myself I get them to do the work. One of the few people I trust to work on my car.
    Silver 150 Facelift
    TJM Bullbar, Lightforce Genisis Spots, Dual Battery System with bits from everyone, Powerful 4x4 slider/steps, Kaymar rear bar, "Genuine" Roof Racks, MSA Seatcovers, Dashmat, Tint, LED Interior Globes, Bridgestone D697s

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