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Comptech Or Mugen?

Discussion in 'Engine Building' started by FerioVtec94, Apr 15, 2003.

  1. FerioVtec94

    FerioVtec94 Senior Member

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    i have a itr motor with a compression around 11:1, ctr cams, vafc, N1 exhuast, 4.785 final drive, and cam gears....dynoed at 180/136 with a dc sports 4-2-1. I have both a comptech 4-2-1 and mugen 4-1 header that i can put on. I have significant traction problems bc of the jdm final drive so i was leaning towards the mugen. Which header would you guys recommend?
     
  2. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

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    if you have both of them put them both on and see what one you like better
     
  3. liquid00meth

    liquid00meth Senior Member

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    traction problems have nothing to do with final drive.

    What are you talking about?


    If you have traction problems go for the the 4-1, the 4-2-1 will increase your low end and only add fuel to the traction problem fire
     
  4. eyesonlybob

    eyesonlybob Senior Member

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    how does an itr motor with those mods only have 180hp? stock usdm is 195?
     
  5. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

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    high final drive = closer ratio on the tranny = more low end acceleration

    i have the JDM ITR with the 4.785 FD, i cant put it to the floor untill about 1/2 way through 2nd or ill break traction
     
  6. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

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    WHP (at the wheels)

    figure about a 14% loss through the drivetrain
    that puts him at 205.2 at the flywheel
     
  7. GSRCRXsi

    GSRCRXsi Super Moderator Moderator VIP

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    180 to the wheels. the 195 your talking about is measured at the crank. there is substancial loss through the drivetrain so its actually pretty good

    edit: beat me to it, lol
     
  8. dvs_prelude

    dvs_prelude Senior Member

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    Wouldn't 180whp be more like 215-220 at the crank? 180whp is what most IS 300s put out. A stock 5th gen prelude rated at 200hp puts out around 160whp stock... also, S2000s only put out around 195whp.
     
  9. liquid00meth

    liquid00meth Senior Member

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    it's all

    a.) speculation
    b.) not worth arguing about
    c.) not helping him at all
     
  10. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

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    :werd:
    you could be making 3000 hp at the flywheel but if your only getting 200 hp to the wheels what difference does it make
    its all about WHP :)
     
  11. FerioVtec94

    FerioVtec94 Senior Member

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    yeah the shorter final drive definitely worsened my traction, put it this way....i get better 60' when launching in second gear......but it was so worth it.
    for this reason i think the mugen will benefit me more, but i'll test both, i just can't afford all of the dyno time required to tune both headers individually
     
  12. cws13

    cws13 Senior Member

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    The alternative will be slight, but the 4-1 will definately make more high RPM power. For my two cents, my wheel hop and traction problems all but disappeared when I went with an Exedy lightened flywheel and organic clutch. The lightened setup reduced initial shock to the drive line due to less rotational inertia on the flywheel while providing a short path to high RPM horsepower. What you are looking for will be found here faster than a header change. At any rate, the GSR was like a different car after the clutch/flywheel job, lots more power where I wanted it to be, and sooo responsive.
     
  13. dvs_prelude

    dvs_prelude Senior Member

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    True that!
     
  14. pills_PMD

    pills_PMD Super Moderator

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  15. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    E- divide by .86 here, don't multiply by 1.14.... you get the wrong number. You have to divide by .86 to get your 100% number at the crank, not add 14% from the already reduced number.
     
  16. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

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    cool deal thanks :)
    good thing someone is good at math :D
     
  17. JDMilan

    JDMilan Senior Member

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    Go with the mugen 4-1,

    Milan
     
  18. Civic_88ls

    Civic_88ls Senior Member

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    MUGEN all the way!!!! :worthy: :worthy:
     
  19. NewAgeCivicz

    NewAgeCivicz Senior Member

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  20. Spoon-Hatch

    Spoon-Hatch Junior Member

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