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Big bore throttle body

Discussion in 'Gen 3 Prius Accessories and Modifications' started by AzusaPrius, Jun 18, 2024.

  1. AzusaPrius

    AzusaPrius Senior Member

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    Got this from a PriusChat member @3rdGNPrius who got it from @Jay J

    This was originally purchased from HybridPit and now I am really excited to install it tomorrow and I will add a throttle body spacer.

    Last image is with the TB on top of the spacer.
    Screenshot_2024-06-18-15-46-16-1.jpeg Screenshot_2024-06-18-15-46-20-1.jpeg Screenshot_2024-06-18-15-46-35-1.jpeg 20240618_155036.jpeg 20240618_155306.jpeg
     
    #1 AzusaPrius, Jun 18, 2024
  2. Georgina Rudkus

    Georgina Rudkus Senior Member

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    Probably won't make any difference with the current programming of the ECU.
     
    #2 Georgina Rudkus, Jun 18, 2024
  3. AzusaPrius

    AzusaPrius Senior Member

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    Probably but you will never know unless you have it in your prius and use it.
     
    #3 AzusaPrius, Jun 18, 2024
    BlainesGarage likes this.
  4. TMR-JWAP

    TMR-JWAP Senior Member

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    Why do the previous owners no longer own it?
    Does anything in the "Details" make sense? Not a single sentence makes sense.

    This product has a new racing butterfly that expands the diameter of the throttle body by about 2mm by machining!

    The intake area is increased by about 20% compared to the genuine throttle!

    In addition, the movement of the hybrid system indicator becomes smooth, and you can experience the engine response and torque increase over the entire engine speed range!

    The ECU settings are within the correction range of the genuine ECU, so you can use it as is without any issues or codes.

    Good luck! Should be good for 20 or 30 more hp. You're in Cali right? Does it need to have a CARB EO #?
     
    #4 TMR-JWAP, Jun 18, 2024
    Last edited: Jun 18, 2024
  5. AzusaPrius

    AzusaPrius Senior Member

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    They both reverted back to stock to sell their prius.

    Just look at all the gear @Jay J
    put on his prius.

    Same with the guy I bought it from, he has lots of gear for it too.
     
    #5 AzusaPrius, Jun 18, 2024
  6. ChapmanF

    ChapmanF Senior Member

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    Hmm, well, ∆diameter of 2 mm means ∆radius of 1 mm.

    What size of a throttle body would have its area 20% increased by adding 1mm to its radius?

    If I did that right, I come out with a radius just under 11 mm (or a diameter just under 22 mm).

    (π(11mm)² ≈ 380mm², π(12mm)² ≈ 452mm², 19% more. From 10.9² to 11.9² is 21% more, so between 10.9 and 11.)

    I think our throttle body is bigger than 22mm diameter, meaning the 1mm ∆radius would be a smaller relative increase. But then, you probably gotta subtract the area blocked off by the throttle shaft to do this right, and if you do that, the claim could be sort of believably in the ballpark.
     
    #6 ChapmanF, Jun 18, 2024
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  7. AzusaPrius

    AzusaPrius Senior Member

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    Stock is 55mm and can be bored to 58mm

    Image courtesy of maxbore.com
    (RIP George)

    Pulled from archive.org Screenshot_2024-06-18-21-02-10-1-1.jpeg
     
    #7 AzusaPrius, Jun 19, 2024
  8. ChapmanF

    ChapmanF Senior Member

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    So the unit under test here is bored out to 57mm (2mm above stock)?

    It might be hard to call that a 20% area increase—unless you subtract a lot more for the shaft area than I'm thinking.
     
    #8 ChapmanF, Jun 19, 2024
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  9. AzusaPrius

    AzusaPrius Senior Member

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    O.D. is 2.5”=63.5mm

    I would say it was bored closer to 58mm 20240619_084333.jpeg
     
    #9 AzusaPrius, Jun 19, 2024
  10. AzusaPrius

    AzusaPrius Senior Member

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    Alright installation is done...

    I did not disconnect the 12v at all.

    Start up was fine and no strange idle.

    First picture is my original throttle body.

    Second picture shows a little oil in intake manifold and two stubborn studs that are hard to remove without the right tools.

    Third picture is of bored throttle body after I cleaned out the oil from the intake manifold.

    Fourth and fifth picture is the throttle body with the spacer.

    Sixth picture is Blitz intake reinstalled.
    Notice the coolant line goes pefectly around the air filter like it was made for it.

    20240619_102142.jpeg 20240619_102739.jpeg 20240619_122922.jpeg 20240619_123020.jpeg 20240619_125855.jpeg 20240619_131621.jpeg
     
    #10 AzusaPrius, Jun 19, 2024
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  11. AzusaPrius

    AzusaPrius Senior Member

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    First picture is while driving.

    Coolant temp shows 183F and quickly cooled down to below 180F while driving.

    MPH 52 @ 972 RPM

    Air intake temp was 113F

    Outside air temp was 90F

    Third picture is after the test drive.

    Coolant temp barely got to 190F at any time and would quickly drop down.

    Overall I noticed little to no lag and no more sluggish feeling, engine was quieter and picked up speed very quick.

    Well worth the money I paid with these two modifications. 20240619_135139.jpeg 20240619_135111.jpeg 20240619_135056.jpeg
     
    #11 AzusaPrius, Jun 19, 2024
  12. Mendel Leisk

    Mendel Leisk EGR Fanatic

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    Maybe you should disconnect the 12 volt. I’ve found doing that I subsequently do get a momentary high rev at start up. I’d guess it’s recalibrating something, which might be good.
     
    #12 Mendel Leisk, Jun 20, 2024
  13. AzusaPrius

    AzusaPrius Senior Member

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    The computers are automatically adjusting and learning as you use the car so it will do the same thing as disconnecting the 12v but just a little slower and over time.
     
    #13 AzusaPrius, Jun 20, 2024
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  14. AzusaPrius

    AzusaPrius Senior Member

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    Just a few pictures of my after work drive.

    Ambient temp today was 97F

    First picture engine coolant at 188F @ 66 MPH, RPM 1143, air intake 123F

    Second picture engine coolant at 185F
    @ 51 MPH, RPM 1008, air intake 131F

    Third picture is on a long incline.
    Engine coolant at 199F @ 61 MPH, RPM 2718, air intake 118F

    I noticed on another shorter but steeper incline, the RPM was 500 less than normal and the coolant temp was 5F less than normal and did not get to 200F.

    Normally on a 97F day it would have broke 200F and got up to 204F and the RPM would be over 3500-3900 on this certain incline I always drive over.

    Really digging this bored throttle body.
    20240621_223155.jpeg 20240621_223139.jpeg 20240621_223148.jpeg 20240621_223203.jpeg
     
    #14 AzusaPrius, Jun 22, 2024
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