1. Attachments are working again! Check out this thread for more details and to report any other bugs.

Bored out Throttle Body

Discussion in 'Prius c Accessories and Modifications' started by jdkane527, Jun 1, 2016.

  1. jdkane527

    jdkane527 Junior Member

    Joined:
    Jan 27, 2015
    14
    9
    0
    Location:
    Los Angeles
    Vehicle:
    2012 Prius c
    Model:
    Three
    Has anyone else tried boring out the throttle body?

    I had the throttle body bored out from 55mm to 58mm, per a friend's recommendation as he did it to his Prius. The change in air flow is minor enough for the ECU to adjust, and the additional air flow helps the car keep up on the highway. Boring helps make the Prius C a little less boring. ;)
     
    #1 jdkane527, Jun 1, 2016
    m.wynn and Burna J like this.
  2. priusmatty

    priusmatty Active Member

    Joined:
    May 22, 2016
    304
    108
    0
    Location:
    Louisiana USA
    Vehicle:
    2020 Prius
    Model:
    L Eco
    But did it affect fuel economy?
     
    #2 priusmatty, Jun 1, 2016
  3. Kenny94945

    Kenny94945 Active Member

    Joined:
    Mar 24, 2016
    812
    405
    0
    Location:
    Sausalito
    Vehicle:
    2016 Prius v wagon
    Model:
    Four
    I've done it on other cars.

    Yes, fuel economy would decrease, especially since you are driving as if in a race car.

    Can also run into computer re-tuning issues.

    OP is stating a more responsive Prius at highway speeds, no tuning issues and their fun has increased.
    I can't comment on that.

    One can inspect their current throttle body to look for metal/ flashings smoothing improvements that could be made.
    That is what I would do...I would not bore and increase its size.

    FWIW however, with a Prius restrictive intake channel I think this TB mod is a waste, better money spent in other areas such as car stereo, chassis, rattle and sound proofing even home furnishings.

    Modding can be a fun hobby!!!
     
    #3 Kenny94945, Jun 1, 2016
  4. priusmatty

    priusmatty Active Member

    Joined:
    May 22, 2016
    304
    108
    0
    Location:
    Louisiana USA
    Vehicle:
    2020 Prius
    Model:
    L Eco
    Modding is fun, no doubt about it. Personally though, I want to buy a Prius for the extreme fuel economy. If I had another car, I would find it fun to improve performance, but isn't a Prius all about economy? But, to each his own of course!
     
    #4 priusmatty, Jun 1, 2016
  5. Sean Nelson

    Sean Nelson Active Member

    Joined:
    Dec 30, 2014
    421
    182
    0
    Location:
    Vancouver, BC Canada
    Vehicle:
    2012 Prius c
    That's why I got a Prius C, and I'm really happy with it. But I've found that it's a gateway drug - running with the gas engine turned off is so satisfying-but-frustrating because the car fires up the engine back up at the slightest provocation. So now I'm waiting for the Chevy Bolt EV to come out so I can eliminate gas altogether.
     
    #5 Sean Nelson, Jun 1, 2016
  6. jdkane527

    jdkane527 Junior Member

    Joined:
    Jan 27, 2015
    14
    9
    0
    Location:
    Los Angeles
    Vehicle:
    2012 Prius c
    Model:
    Three
    Fuel economy is approximately the same. The coolant wasn't bypassed, so the air isn't as dense as compared to before to impact fuel economy. Although it consumes more fuel accelerating and under load, when cruising it is able to maintain high fuel economy. Avg mpg is 50+ mpg for long trips on the highway. It is a minor mod to improve throttle response and helps when on the highway. Don't expect it to help you overtake many more cars or any cars as compared to before. :ROFLMAO:
     
    #6 jdkane527, Jun 2, 2016
    priusmatty likes this.
  7. AzusaPrius

    AzusaPrius Senior Member

    Joined:
    May 27, 2020
    2,069
    868
    0
    Location:
    California
    Vehicle:
    2010 Prius
    Model:
    IV
    I want to try this with my short ram intake and magnaflow cat.
     
    #7 AzusaPrius, Nov 26, 2022
(You must log in or sign up to post here.)