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Si or GS-R transmission

Discussion in 'Engine Building' started by labe lincoln, Mar 29, 2009.

  1. labe lincoln

    labe lincoln New Member

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    I am swapping in a B18a into my 95 civic. I do not have my transmission yet because im not sure which i want. I will have about 200hp+ n/a and then about 300 with nitrous. Im not sure whether i should go with an si tranny or gsr tranny for my combo. About where would an si top out on the highway. How do they compare?
     
  2. YBLEGAL

    YBLEGAL Regular Member w/ Cheese

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  3. Slow&Delirious

    Slow&Delirious isn't fast or furious

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    the fatboy race works link is awesome
     
  4. eg6sir

    eg6sir Supa Mod Moderator VIP

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    i say GSR, SI has better gears but the GSR tranny has a stronger differential .. and the gearing isnt too much different, slightly longer gears.. better for nitrous

    SI tranny at 80mph/5th sits at 4400 rpm , GSR sits at 4k rpm...
     
  5. 99sidude

    99sidude Moderator Moderator VIP

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    werd. being 400 rpm's lower during cruising makes all the difference for noise. Take it from me, I used to drive a 99 si, and now have a gsr hatch. Idk if it's the lower gearing, but I also get better mileage (3-4 mpg better on the highway) now than with my old civic.
     
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