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d series transmissions

Discussion in 'Civic and CRX - EF' started by GlassHeadlights, Jun 7, 2008.

  1. GlassHeadlights

    GlassHeadlights West West Yall

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    in my ef si, with a si tranny i get 100kmh in 5th @ 3000 ish rpm. in my dads ef si, with a dx tranny he gets 130kmh in 5th @ 3000 ish rpm. what gives:confused: could i put a dx 5th gear in my si case with 1,2,3,4 si and dx 5th gear? is there any other tranny with a higher ratio i could use?thx
     
  2. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    Yes you can do it, no I don't know for sure if there's a taller 5th. Our reference section should have specs for the D transmission ratios.
     
  3. stock98EKcoupe

    stock98EKcoupe New Member

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    yes you can swap gears like that. The EX/SI D series transmissions all have shorter gears, which makes them quicker. VX/DX/LX trannys all have long gears, good for higher top speeds and better gas mileage.
     
  4. K2e2vin

    K2e2vin Senior Member

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    You can swap gears but you won't notice a gain; the 1-5 in the DX is the same as the Si. The difference is the final drive; DX is 3.888 while the Si is 4.25. If you only want to change 5th; just drop in a HF 5th gear.

    Also, lower revs don't always mean better MPG. I got 57mpg hwy while cruising at 4000rpm(70mph) and another user on HT and D-series.org noticed gains from switching to a shorter(numerically high) final drive ratio.
     
  5. GlassHeadlights

    GlassHeadlights West West Yall

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    hf is a crx right? well we dont have them in canada eh.
     
  6. t3t4delsol

    t3t4delsol New Member

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    here read this I know its long but its should help you understand gear ratios in honda trannys

    bensebuilt
     
  7. GlassHeadlights

    GlassHeadlights West West Yall

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    I looked at a sticky and it says that the gearing is all the same but the final drive is differnt?
     
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