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Hf To Si

Discussion in 'HYBRID -> EG-EK / DC' started by chad123, Apr 1, 2003.

  1. chad123

    chad123 Member

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    OK i have 1988 honda crx hf..I found a 89 crx si head and ecu for cheap and i was wondering if i swaped my hf head and ecu with si head and ecu will i get any more horse power out of my car???
     
  2. D See 2

    D See 2 Senior Member

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    definitely. try to find the intake manifold as well. you will DEFINITELY notice a gain. your hf has an 8 valve head and is fueled for better gas economy. the si head is a 16 valve and will make a difference.
     
  3. whatdahieu

    whatdahieu Senior Member

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    you would also have to switch from dual to multi point fuel injection
     
  4. biglee414

    biglee414 Senior Member

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    no you dont have to convert to multi point fuel injection, an hf is already multi point, a dx is dual point fi
     
  5. D See 2

    D See 2 Senior Member

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    werd
     
  6. chad123

    chad123 Member

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    SO if i switch to an SI head and ECU im gonna get more power correct??..
     
  7. whatdahieu

    whatdahieu Senior Member

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    true story, i don't know what i was thinking :eek:
     
  8. Civic_88ls

    Civic_88ls Senior Member

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    Yeah, u will get quite a bit more of a boost in speed. Use the si manifold tho.
     
  9. chad123

    chad123 Member

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    do yo uknow about how much more horse power i could get out of switching to si head ,ecu,manifold??
     
  10. Mech

    Mech Banned

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    D15B6 (hf, your motor)
    .
    Displacement (cc): 1493
    Power (bhp@rpm): 62@4500
    Torque (ft/lbs@rpm): 83@3000
    Compression Ratio: 9.1:1
    Bore (mm): 75
    Stroke (mm): 84.5
    Cam Design: sohc
    VTEC?: no
    OBD: 0
    Year(s) Produced: 1988-1989
    In the following car(s): Honda Civic HF / CRX HF

    With manifold, ecu, and head..... vwalaaa!!:
    D16A6 (si.... your upgrade)
    .
    Displacement (cc): 1590
    Power (bhp@rpm): 108@6000
    Torque (ft/lbs@rpm): 100@5000
    Compression Ratio: 9.1:1
    Bore (mm): 75
    Stroke (mm): 90
    Cam Design: sohc
    VTEC?: no
    OBD: 0
    Year(s) Produced: 1988-1991
    In the following car(s): Honda Civic Si/ CRX Si

    All in all.... Very worth it. :spin:
     
  11. chad123

    chad123 Member

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    WOW thats a nice gain!!!! and i can use my hf TRANSMISSION CORRECT??
     
  12. Mech

    Mech Banned

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    yeah, but I'm not sure if the si has shorter gears or not. Look into getting the si tranny if it has shorter gears. But yeah, it's a very nice gain.
     
  13. chad123

    chad123 Member

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    HF is alot lighter than the si soo thats gonna be a PLUS when i swap correct??
     
  14. Mech

    Mech Banned

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    The Si tranny is a little different but I don't know if it's really worth spending your money. I think the HF is lighter because of the motor size mainly, and maybe a couple of interior things. Once you add all this stuff it should be about equall to the DX. The Si has the sunroof and power everything so it will wieght more.
     
  15. chad123

    chad123 Member

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    so the HF transmission will work fine right??
     
  16. Jeef

    Jeef NO MA'AM Moderator VIP

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    Yes but you will be slower with it.
     
  17. chad123

    chad123 Member

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    where is my ECU located in my 88 honda crx HF
     
  18. crxswap

    crxswap Junior Member

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    your ECU is under the carpet on the right hand side under the dash
     
  19. saturn_boy96

    saturn_boy96 88 C1V1C 53D4N DR1V3R

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    your numbers are not going to be the same as the d16a6, you don't have the same displacement.
     
  20. farmer_jason

    farmer_jason Senior Member

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    your displacement will stay the same which means less torque then the d16a6
     
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