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3.5L Atkinson Exhaust

Discussion in '3rd Gen. Tacomas (2016-2023)' started by KB Voodoo, Feb 26, 2015.

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  1. Mar 2, 2015 at 5:27 PM
    #21
    NEAScott

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    NEAScott Well-Known Member

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    You'd be awfully surprised at how much the sound files are doctored on the commercials.

    Had a nice conversation at one time with the audio engineer for the Ford F-150 Torture Test videos. Heavily modified audio here ... F-150 Torture. Said that the only thing that was pretty well left alone was Mike Rowe's voice.
     
    NEAScott, Mar 2, 2015
    #21
  2. Apr 6, 2015 at 3:36 PM
    #22
    rme

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    rme Well-Known Member

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    I wear hearing aids so it really doesn't really matter.....:D
     
    rme, Apr 6, 2015
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  3. Apr 6, 2015 at 6:22 PM
    #23
    TotalAutoParts

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    TotalAutoParts Well-Known Member

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    TotalAutoParts, Apr 6, 2015
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  4. Apr 6, 2015 at 6:26 PM
    #24
    chris4x4

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    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    FlimFlubberJAM
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    Incorrect. Exhaust systems should have NO back pressure. Tuning the exhaust to maximize scavenging is the key. The new Pentastar engine from Chrysler has a fully tuned exhaust system, and the best after market systems yield a 5 hp loss. Given that exhaust systems have to meet certain sound requirements, and manufactures are on the cheap side, they do this by using baffled mufflers, which can fuck up the inherent scavenging designed in the exhaust, OR, they are forced to make it fit a certain way, and for a certain cost, thus killing some of the scavenging. Aftermarket exhaust systems can use a "better" muffler to make this less noticeable, but the best gains come from a properly tuned exhaust system. As for the "Atkinson" cycle thing.......Its still an Otto cycle engine, that mimics an "Atkinson" cycle when under low loads, by using the intake valves to reduce compression.
     
    chris4x4, Apr 6, 2015
    #24
  5. Apr 6, 2015 at 6:37 PM
    #25
    chris4x4

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    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    chris4x4, Apr 6, 2015
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  6. Apr 6, 2015 at 6:52 PM
    #26
    KB Voodoo

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    KB Voodoo [OP] Well-Known Member

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    It's so strange seeing the tach peg at redline but the speedometer keeps climing.
     
    KB Voodoo, Apr 6, 2015
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  7. Apr 6, 2015 at 8:37 PM
    #27
    snowmanwithahat

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    snowmanwithahat Well-Known Member

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    that is really bizarre but kind of awesome at the same time.
     
    snowmanwithahat, Apr 6, 2015
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  8. Apr 7, 2015 at 11:48 AM
    #28
    TotalAutoParts

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    TotalAutoParts Well-Known Member

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    Interesting explanation of what Toyota calls "Atkinson" Chris is technically right regarding the cycle and design.


    http://blog.toyota.co.uk/toyota-use-atkinson-cycle-engines


    Also, this explains the cycle - Our Point of View: Atkinson Meets Otto
     
    Last edited: Apr 7, 2015
    TotalAutoParts, Apr 7, 2015
    #28
  9. Apr 7, 2015 at 11:51 AM
    #29
    TotalAutoParts

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    TotalAutoParts Well-Known Member

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    Have you ever driven one? Its such a weird feeling. We had an Altima rental car at a show once, always seemed like it was about to blow up.
     
    TotalAutoParts, Apr 7, 2015
    #29
  10. Apr 7, 2015 at 4:35 PM
    #30
    chris4x4

    #30
    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    The CVT in the Altima, and Prius for that matter.......and Rogue, Morano, etc., aren't very refined, or programmed very well. The CVT in my Accord is incredibly impressive, however for 2015 Honda reprogrammed its behavior, and performance characteristics. That being said, it is an interesting driving experience.
     
    chris4x4, Apr 7, 2015
    #30
  11. Apr 8, 2015 at 4:20 AM
    #31
    rme

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    rme Well-Known Member

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    Did you feel like you were getting better mpg's or had the power to do what you wanted...or was it just different? Did it affect handling in anyway?

    I'm waiting for the 2017 Tacoma! (Want to give the 2016 a chance to shake out all the bugs)
     
    rme, Apr 8, 2015
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  12. Apr 8, 2015 at 5:54 AM
    #32
    chris4x4

    #32
    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Are you asking about engine, or the CVT transmission?
     
    chris4x4, Apr 8, 2015
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  13. Apr 8, 2015 at 5:58 AM
    #33
    KB Voodoo

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    KB Voodoo [OP] Well-Known Member

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    Transmission, I believe.
     
    KB Voodoo, Apr 8, 2015
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  14. Apr 8, 2015 at 6:07 AM
    #34
    rme

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    rme Well-Known Member

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    Both...I know you can adjust the transmission but the feeling of the output of the engine thru the xmsn is what I was trying to feel out. I've read alot of your post so I'm not sure I'm able to put into words what I'm trying to say. I guess is how did it feel to you? Normal (whatever that is) or did you feel like you had plenty of power to get the speed you needed or the job done you were trying to accomplish?
     
    rme, Apr 8, 2015
    #34
  15. Apr 8, 2015 at 6:29 AM
    #35
    mach1man001

    #35
    mach1man001 eh whatever

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    None of you guys have ever ridden a snowmobile or an ATV? They are the same way. At full throttle the transmission slips just enough to let the motor be at the right RPM for max power and pretty much just stays there while your speed increases
     
    mach1man001, Apr 8, 2015
    #35
  16. Apr 8, 2015 at 6:40 AM
    #36
    KB Voodoo

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    KB Voodoo [OP] Well-Known Member

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    The last four wheeler I rode was a traditional manual.
     
    KB Voodoo, Apr 8, 2015
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  17. Apr 8, 2015 at 7:42 AM
    #37
    rme

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    rme Well-Known Member

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    I did not know that.....
     
    rme, Apr 8, 2015
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  18. Apr 8, 2015 at 1:01 PM
    #38
    TotalAutoParts

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    TotalAutoParts Well-Known Member

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    The Altima has belts and the Accord has a chain right? The altima belts would smell like burning.
     
    TotalAutoParts, Apr 8, 2015
    #38
  19. Apr 8, 2015 at 2:21 PM
    #39
    StAndrew

    #39
    StAndrew Wait for it...

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    Chris
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    Intake, exhaust, lift. Typical stuff.
    That's pretty cool :thumbsup: I was a little baffled on how Toyota was getting such good power numbers from the Atkinson motor...

    So it appears that when power is needed, the variable valve timing will adjust so the engine operates like a typical Otto cycle engine. It can then dynamically adjust to operate like an Atkinson cycle engine as needed.

    Like Ford's eco boost, I predict rated MPG's and observed MPG's are going to be a little off for those with a heavy foot.
     
    StAndrew, Apr 8, 2015
    #39
  20. Apr 8, 2015 at 4:14 PM
    #40
    chris4x4

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    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Honestly, I have always hated CVT's. They never gave a "connected" feeling, and felt as though the power was transferred via a rubber band. That being said, the CVT in the Accord is dam near perfect. Torque converter seems to lock up at around 20 mph, and stays locked, until you come to a stop. Under normal driving, RPM's never go above 2k rpm. Brisk driving never goes above 3k rpm, and seems to mimic an auto with a shit load of gears, as rpm's have a definitive "drop" as you are accelerating. The power delivery feels just as connected to your foot, as if it was a really good auto tranny. If you need to pass, you push on the throttle, and revs jump immediately to the perfect spot to give the desired acceleration.
     
    chris4x4, Apr 8, 2015
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