Hondata 04-06 TSX Reflash
Part Number: K24A2

Hondata 04-06 TSX Reflash
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    Will It Fit Your Vehicle?


    The TSX reflash advances the ignition, alters the cam timing and optimizes the fuel for better driving and advanced performance. It adds up to 29hp and up to 26 ft/lbs fo torque.

    The Hondata TSX reflash is designed for use with an intake and headers. It will work very well with a stock airbox and stock headers. Testing was done with a stock cat back system.


    You are responsible for paying for and sending your ECU to Hondata. You can send your ECU as fast as you would like and shipping costs normally start at $10.00 for ground and $60.00+ for next day air. We recommend using an express service (2 day or next day) through FedEx or UPS because they have the least amount of delivery problems, provide proper insurance, and have good package tracking. We recommend that you do not use USPS because of delivery issues. You are not sending your ECU to K Series Parts you will be sending it to Hondata directly and we provide all of the instructions on where it needs to be sent once your order is approved.


    After we approve your order we will send you two emails, one email will be a Hondata form and the other email will be instructions for shipping and what items need to be included. Orders submitted by 3:00pm Mountain Standard Time Monday to Friday are normally approved same day. Orders places after 3:00pm MST or on Saturday and Sunday are processed the next business day.

    Hondata normally reflashes ECU's the same day they receive them but they do get busy and it might take an extra business day. We recommend that you plan on a 3 day total turnaround time from the day that Hondata receives your ECU.

    Return Shipping

    Hondata uses K Series Parts FedEx account to next day air the ECU back to you once the reflash has been installed. This means that you do not have to pay for return shipping. Your ECU will arrive by 3:00pm the day after Hondata completes the reflash installation. Hondata does not provide us with a tracking number or notification when they ship the ECU back to you.

    ECU Serial Number

    The serial number is located on the ECU. Hondata has provided instructions on how to remove the ECU.

    International Customers

    K Series Parts cannot sell reflashes to customers outside of the United States per Hondata request. The shipping address must be a US based address.


    Any K24A2 TSX Manual transmission owner with the ECU part numbers:
    • RBB-A02 - 04 TSX
    • RBB-A03 - 05 TSX
    Any K24A2 TSX Auto transmission owner with the ECU part numbers :
    • RBB-A54 - 04 TSX
    • RBB-A55 - 05 TSX


    • 5000 rpm VTEC point decreased from 6000 rpm
    • 7600 rpm Rev limit, increased from 7300 rpm (for auto trans must be in sportshift mode)
    • Maximum torque gain 26 ft/lbs torque at 6000 rpm
    • Maximum power gain 29 hp at 6000 rpm
    • Peak torque increases from 169ft/lbs at 4500 rpm to 175 ft pounds at 7500 rpm
    • Peak power increases from 206 hp at 7100 rpm to 210 at 6800 rpm
    • Very wide flat smooth torque curve. 90% of peak torque available from 2000-7000 rpm
    • Fully dealer compatible - works with all Honda scan tools and equipment


    Any increase in RPM limit is at your own risk. If you suffer engine damage that is related to excessive revs Honda / Acura will not cover your warranty.

    With regard to aftermarket parts, the law is that warranty coverage cannot be denied simply because such parts are present on the vehicle, or have been used. For more details read the K series FAQ.


    Honda may not cover mechanical damage to the engine under warranty resulting from exceeding the factory red line. Hondata & K Series Parts will not cover any damage as a result of installing this product.


    Brand: Hondata
    Part Number: K24A2
    CARB Approved: Yes
    Hondata: Reflash

    Vehicle Fitment

    Acura TSX

    5 reviews for Hondata 04-06 TSX Reflash

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    5 out of 5.0

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    5 out of 55 out of 55 out of 55 out of 55 out of 5

    6/18/2012 by Jake

    Great bang for the buck mod!

    Great value for the cost to benefit ratio. Doesn't add a huge amount of peak power BUT makes the car much more enjoyable all around..and definitely more eager to rip through 1st to 3rd - redlining them all of course! And I could be crazy but my mileage seems better but def as good as before but with the car being much quicker. My car is stock otherwise..looking to add an intake next which should further enhance the Reflash and the cars performance.

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    10/31/2011 by RSS06TSXAuto

    Definitley worth while

    Besides road noise, one thing that has always annoyed me about the TSX Auto, is the transmission always seems to stay in too high of a gear, and the engine just didn't do much until it hit 6000 rpm. This fixed that by providing more power sooner, as well as I notice a 3% improvement in fuel economy. Passing without needing to use the sport shift mode can be done with more confidence. Note that below 4400rpm the car seems the same. Turnaround is very quick, and Club RSX handled the order and questions with no nonsense.

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    10/2/2009 by Danny (rsxd23)


    **10/2/2009** I have had the reflash on now for a month and I love the power& the way the car picks up speed much faster then before. When in the high RPMS you can just keep pushing it and it keeps going it really feels like a different car. The gas millage has not changed it has stayed the same or a little better. I have Injen CAI, Comptech header, and Tanabe SHM exhaust and it really woke the car up even more with he reflash. The extra torque really helps on hills on my way to work no more need to downshift. Overall great upgrade for this car and worth every penny.

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    2/17/2009 by Delwayane Ferraro

    06 TSX with reflash

    All I can say is wow! My god! I have an 06 TSX with CAI system DC 421 headers, NGK spark plugs and a hondata heat shield. I just got my car back from my boys shop. I took it for a test drive and coming out of first gear the the car through my head back. Its like a totally different car. Is getting this reflash the best bang for your buck? yes it is. I think anybody with a TSX should get it done if you want some serious power. The thing is I'm not done with my car. I still have to put in my exhaust system. I wait to see what that does for me

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    11/10/2008 by aaron knight

    Worth the Money!!!

    Excellent ECU upgrade, especially since TSX has no tuneable ECU options. Great power under the curve, clears up alot of the notchiness of the TSX ECU from Honda. Worth buying if you plan to keep your car a little while. Best bang for the buck HP upgrade out for the TSX.