se 58mm throttle body to big??

Discussion in 'Engine, Fuel and Exhaust' started by jlouden, Jan 28, 2011.

  1. jlouden

    jlouden Member

    18
    1
    0
    hello all.i was wondering if the se 58mm tb w/larger injectors would be to big for my build. right now i have an 08SG,106s&s big bore kit,s&s 583 cams,s&s air cleaner,v&h 2 into 1 exhaust,pcv w/auto tune. gettin ready to put the s&s 89cc heads on this winter. thanks
     
  2. R.Bingham

    R.Bingham Active Member

    317
    0
    4
    Yes it's too big. That throttle body is meant for the 120R. A SE 50 will do just fine, or send your stock unit to HPI for a work over.
     
  3. FishHunter

    FishHunter Active Member

    134
    26
    1
    Not to argue, or contradict, but the S/E 58 flows so poorly, it will be fine, and probably show some worth.
    Recently installed a 58mm FBW, with HPI's 1.800" "Y" manifold on a 107", that was dynoed 9000 miles earlier, with a good combination.
    Port matched the heads and brought a 2.00" Ferrea intake valve to it.
    Intial dyno testing has shown a HUGE increase.:D
    Scott
     
  4. jlbeebe

    jlbeebe Member

    77
    0
    0
    I have a heritage softail with a se stg iv big bore kit. It includes the 58mm throttle body. After going with some woods cams and having the right person tuning this bike I got 104hp and 118tq. I am pleased with this set up. My indy guy did say he thought that a smaller throttlebody would make it more "responsive".
     
  5. FishHunter

    FishHunter Active Member

    134
    26
    1
    The engine combo I'm describing, vastly improved from the bottom to the top, and apparantly the OE t/body was a huge choke point.:s
    Scott