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wwwaaayyy too many RPMs

Discussion in 'General Tech and Maintenance' started by Hellbert, Jun 2, 2005.

  1. Hellbert

    Hellbert Senior Member

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    i have an 89 b16 5 speed tranny on a 93 ls and its turning 3000 rpms give or take a few at 55 mph...and i cant figure out why. there is no clutches in the tranny to make it slip like an auto. my clutch grabs and holds fine. i dont understand why its turning that high. any help would be greatly appriciated thanks in advace
     
  2. 92civicb18b1

    92civicb18b1 The Trisexual

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    i think the gears are just short
     
  3. Hellbert

    Hellbert Senior Member

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    i know there short but that short?!?!? looks like my tranny might be going to the man for an LS 5th....:(
     
  4. HollowJDM

    HollowJDM Senior Member

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    my tranny 2700rpm 4th gear is 50 mph, now i know your gears are close than my dx tranny but still, 3 grand at 55 in 5th gear? somebody try to make a franken tranny?
     
  5. 92civicb18b1

    92civicb18b1 The Trisexual

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    yea....I know they're short, do the math and figure it out. I don't remember the formula though.
     
  6. 92civicb18b1

    92civicb18b1 The Trisexual

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    Engine RPM / 5th gear ratio / final drive ratio = axle RPMs

    axle RPMS / Tire Rotations per mile (Found Here) = Miles per minute

    then...

    Miles per minute x 60 = Miles per hour
     
  7. CoreyR

    CoreyR Senior Member

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    yes thats how short the B16 gears are. there is nothing wrong or changed in the tranny thats just how it is.
     
  8. 92civicb18b1

    92civicb18b1 The Trisexual

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    the math puts it at 55.3 mph at 3k
     
  9. 92civicb18b1

    92civicb18b1 The Trisexual

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    I bet you have 14s also
     
  10. HollowJDM

    HollowJDM Senior Member

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    all i can say is if you daily drive highways a lot, you may want to consider a quiet exhaust system, lol, some of my friends were about 4 carlengths behind me the other day on interstate and we was doin 80 or so, 4 grand ish on reg. throttle and they called me telling me to coast...

    :p
     
  11. asmallsol

    asmallsol Super Moderator

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    lol, my car goes down the highway at 80 at 4000 rpms. Its a honda. This isn't really that weird in imports or 4 cylinders. My dads mini is about 3500, and same with his Miata.
     
  12. B16CRX

    B16CRX Senior Member

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    at 55 my tranny puts me around 3K. Its not that bad. I hit vtec at 90mph
    (4500 rpm)
     
  13. jamesA

    jamesA Well known pissed off telephone guy VIP

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    in 5th gear with a 4.4 final drive:
    55 mph - 3000 rpm
    65 mph - 3500 rpm
    72 mph - 4000 rpm
    80 mph - 4500 rpm
    110 mph - 5500 rpm

    That's just the way the B16 trannies are man.
     
  14. ksrcivic

    ksrcivic Senior Member

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    my b16a did exactly that.... 80mph@4500 thats just how short the b16 tranny is
     
  15. b16coupe

    b16coupe Senior Member

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    :werd:

    I've driven for for about 20 mins in vtec goin like 80-90mph the whole time. Goodbye gas mileage and hello acceleration.
     
  16. jamesA

    jamesA Well known pissed off telephone guy VIP

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    It's even worse at 120. 17 mpg owns... :ph34r:
     
  17. sihatchback_RL

    sihatchback_RL Senior Member

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    that's just how b16 trannies are, SHORT. i used to have one on my gsr, pulls good when you're racing, but i hate to take it on the free way. think b16 are short, try type r.
     
  18. Hellbert

    Hellbert Senior Member

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    alright, thanks, i was worried it was something wrong with mine. this is actually the first b series swap i have done. ive done many mini me swaps and stupid little things here and there. ive helped friends do them but this is the first one ive done and driven at highway speeds. usualy it was wide open or putting around so i didnt realize what rpms it was turning. befor the crx i drove a 93 3.0 ford ranger and it turned about 23-2500 at highway speeds and all the civics ive rode in turn about the same so.... i appriciate the help, im gonna put a thread in some other forum on here with a list of all the stuff ive done to it and a not so finished picture so look out for it and let me know what you think! thanks again! later
     
  19. wanderinman

    wanderinman Senior Member

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    I wrote that :-D
     
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