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Thread: F2K5 vs B2K5 Transmission Ratio

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    F2K5 vs B2K5 Transmission Ratio

    Well, I just bought my B20A manual Transmission (oh yeah)

    I got the B2K5 Model (came from a Gold Top B20A)

    I was wondering if anyone had the gear ratio for both of these transmissions?!?!

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    250 Canadian :)

    But I'll need the flywheel guard (under the block) the flywheel itself and the clutch/pressure plate

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    I need these parts!
    https://www.3geez.com/forum/showthread.php?t=67742

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    B2K5 ratios are:
    1st 3.166
    2nd 1.857
    3rd 1.259
    4th 0.967
    5th 0.794
    Reverse 3.000
    Final reduction 4.066

    BTW, the ratios are the same for all B2K5's whether it came from an Accord or Prelude.
    No idea about the F2K5.
    Major modifications include:
    JDM Accord B20A engine swap
    89 SEi rear disc conversion
    3geez member since Aug 18, 2000

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    I'll soon start to rebuild my B20a with some *special* parts :smokin: This is when I'll be enjoying it the most I think.

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    LX User Versanick's Avatar
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    I have a b20a, and I have higher RPM in every gear than my buddy with his 92 GSR w/ys1 tranny. Those gear ratios are:
    3.307
    2.105
    1.459
    1.107
    .875
    reverse: 3.00
    final 4.40

    I don't know any way that we could possibly have gears that are that much longer than the ys1... His slightly larger rims and tires can't be completely making up the difference. I don't know if I believe those gear ratio numbers. I would like to test them when I take my tranny apart this next winter..

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    Re: F2K5 vs B2K5 Transmission Ratio

    LX-R coming soon Here's a hint. 89mm stroke/ 41.60cc head /ARP head & main stud's /SRP piston's 81.5mm 9:5:1/Crower Rod's & more to come

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    Re: F2K5 vs B2K5 Transmission Ratio

    Move this thread to JDM B18A / B20A Swap Tech
    LX-R coming soon Here's a hint. 89mm stroke/ 41.60cc head /ARP head & main stud's /SRP piston's 81.5mm 9:5:1/Crower Rod's & more to come

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    Re: F2K5 vs B2K5 Transmission Ratio

    Still nobody knows the difference between the b2k5 and the f2k5 B20A gearboxes. I now own both boxes. Wonder if theres a difference in the lengths of the gears

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    Re: F2K5 vs B2K5 Transmission Ratio

    Quote Originally Posted by AccordB20A View Post
    Still nobody knows the difference between the b2k5 and the f2k5 B20A gearboxes. I now own both boxes. Wonder if theres a difference in the lengths of the gears
    i had both and i could not tell the difference.
    LX-R coming soon Here's a hint. 89mm stroke/ 41.60cc head /ARP head & main stud's /SRP piston's 81.5mm 9:5:1/Crower Rod's & more to come

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    Re: F2K5 vs B2K5 Transmission Ratio

    I know that my digi dash is accurate on the f2k5 and its 10 km/h out on the b2k5 lol

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    Re: F2K5 vs B2K5 Transmission Ratio

    There is a difference in the ratios between the two trannys but I dont know the numbers for the F2K5. Someone take one apart and count the teeths. No? :)


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    Re: F2K5 vs B2K5 Transmission Ratio

    Quote Originally Posted by thegreatdane View Post
    There is a difference in the ratios between the two trannys but I dont know the numbers for the F2K5. Someone take one apart and count the teeths. No? :)
    i just had mine apart to dam.
    LX-R coming soon Here's a hint. 89mm stroke/ 41.60cc head /ARP head & main stud's /SRP piston's 81.5mm 9:5:1/Crower Rod's & more to come

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    Re: F2K5 vs B2K5 Transmission Ratio

    i blew one a while back. man it was a cunt to get apart to strip it down for scrap lol

    why did they change the gearbox between 86 and 88 i wonder.. probably so the underpowered craptop (blacktop) could still propell the car haha

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    Re: F2K5 vs B2K5 Transmission Ratio

    Quote Originally Posted by AccordB20A View Post
    i blew one a while back. man it was a cunt to get apart to strip it down for scrap lol

    why did they change the gearbox between 86 and 88 i wonder.. probably so the underpowered craptop (blacktop) could still propell the car haha
    I had mine apart in under five minutes. AccordB20A the next one you tare apart i will buy the gears from you let me know.
    LX-R coming soon Here's a hint. 89mm stroke/ 41.60cc head /ARP head & main stud's /SRP piston's 81.5mm 9:5:1/Crower Rod's & more to come

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    Re: F2K5 vs B2K5 Transmission Ratio

    Quote Originally Posted by TWOLOUDNPROUD View Post
    I had mine apart in under five minutes. AccordB20A the next one you tare apart i will buy the gears from you let me know.
    that hopefully wont happen. I dont wanna blow another one lol

  18. #18
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    Re: F2K5 vs B2K5 Transmission Ratio

    Tire Size
    205/40/17
    Tire Diameter in 23.46
    RPM Redline 7500

    Transmission & Gear Ratios

    B2K5 ratios are:
    1st 3.166 40.68MPH
    2nd 1.857 69.35MPH
    3rd 1.259 102.3MPH
    4th 0.967 133.19MPH
    5th 0.794 !62.2MPH
    Reverse 3.000
    Final reduction 4.066

    And

    F2K5 ratios are:
    1st 3.166 40.68MPH
    2nd 1.772 72.68MPH
    3rd 1.185 108.68MPH
    4th 0.967 133.19MPH
    5th 0.794 162.2MPH
    Reverse 3.000
    Final reduction 4.066

    Here the Calculator i used
    http://www.fatboyraceworks.com/gears...raph&Compare=1

    And a special Thanks to thegreatdane for telling me where i can find these Number's.
    Last edited by TWOLOUDNPROUD; 08-23-2008 at 09:03 AM. Reason: update
    LX-R coming soon Here's a hint. 89mm stroke/ 41.60cc head /ARP head & main stud's /SRP piston's 81.5mm 9:5:1/Crower Rod's & more to come

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    Re: F2K5 vs B2K5 Transmission Ratio

    ^^^^^^^^^^^^^^^^Update^^^^^^^^^^^^
    LX-R coming soon Here's a hint. 89mm stroke/ 41.60cc head /ARP head & main stud's /SRP piston's 81.5mm 9:5:1/Crower Rod's & more to come

  20. #20

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    Re: F2K5 vs B2K5 Transmission Ratio

    mean. so there is a difference in 2nd and 3rd lol. nice to know. i run a f2k5 box and now i know theres not much of a difference i will probably install my other b2k5 when i swap motors.

    I cant tell the difference between the two.

  21. #21
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    Re: F2K5 vs B2K5 Transmission Ratio

    Quote Originally Posted by AccordB20A View Post
    mean. so there is a difference in 2nd and 3rd lol. nice to know. i run a f2k5 box and now i know theres not much of a difference i will probably install my other b2k5 when i swap motors.

    I cant tell the difference between the two.
    The F2k5 is 3.33mph faster in 2gear and 6.38mph faster in 3gear then the B2K5 that not much of a difference between the two trany's
    LX-R coming soon Here's a hint. 89mm stroke/ 41.60cc head /ARP head & main stud's /SRP piston's 81.5mm 9:5:1/Crower Rod's & more to come

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