Injector Size and Whp output

Thread in 'Technical Questions' started by jon1200, Dec 9, 2008.

  1. jon1200

    jon1200 Active Member

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    I found this and thought i would share it with you as its a much asked Question.


    This is a conservative rating at 3 bar. * indicate side feed injector sizes that can be bought from Nissan, Nismo or Tomei. Alot of the sizes you can not get but are there to help you if you are looking at a cetain flow rate by going to 4 bar.


    3 BAR = 44 PSI, All the Nissan's with Fuel Pressure Regulators operate at 3 bar.

    4 BAR = 59 PSI Running at 4 bar is better than running at 3 bar. Here is why, you can get more WHP from your injector at 4 bar, there is no xtra cost for a 4 bar program from JWT, you get better drivability at 4 bar because of better fuel atomization and you car will do better at the emissions station becasue of better fuel atomization.

    All Nissan Side feed injs are high impedence

    For Low Impedance injectors use 6.8 ohms 10 watt resister

    The GTIR 444cc Inj is low impedance

    91-99 USDM SR20DE = 259 cc side feed injs
    00-02 USDM SR20DE RR = top feed injs

    U12, U13, W10 and W11 SR20DET = 370 cc Side Feed injs
    Pulsar GTIR SR20DET = 444 cc Top Feed injs

    S13 and S14 RWD SR20DET =370 cc Side Feed injs
    S15 RWD SR20DET = 444 cc Side Feed injs

    SR20VET = 444cc Top Feed
    SR20VE 20V = 350cc Top Feed

    Side Feed Injs

    23 cc = 16 WHP
    46 cc = 31 WHP
    93 cc = 63 WHP
    139 cc = 94 WHP
    185 cc = 125 WHP * Pink GA16
    231 cc = 156 WHP
    259 cc = 175 WHP * Red SR20DE
    278 cc = 187 WHP
    324 cc = 218 WHP
    333 cc = 226 WHP * Grey SR20VE
    ---------------------------------------------333 cc @ 4 bar = 261 WHP
    370 cc = 250 WHP * Purple SR20DET
    ---------------------------------------------370 cc @ 4 bar = 290 WHP
    416 cc = 281 WHP
    444 cc = 299 WHP * Brick Brown SR20DET ( S15 )
    ---------------------------------------------444 cc @ 4 bar = 345 WHP
    462 cc = 312 WHP
    509 cc = 342 WHP
    555 cc = 373 WHP * Yellow
    ---------------------------------------------555 cc @ 4 bar = 423 WHP
    601 cc = 405 WHP * Yellow Tomei
    ---------------------------------------------601 cc @ 4 bar = 457 WHP
    647 cc = 436 WHP
    692 cc = 468 WHP
    740 cc = 500 WHP * Red
    ---------------------------------------------740 cc @ 4 bar = 580 WHP

    850 cc = 570 WHP SARD
    ---------------------------------------------850 cc @ 4 bar = 660 WHP

    Nissan Top Feed Injs

    350cc = 275 WHP * Green SR20VE 20V P12

    444cc = 299 WHP * Yellow RNN14 GTIR

    444cc = 299 WHP * Yellow SR20VET




    MSD Top Feed Injs

    36 lb = 250 WHP
    50 lb = 355 WHP
    72 lb = 520 WHP
    96 lb = 690 WHP

    MSD Injs do not run right at 4 bar so don't try it.


    04-07 Subaru STI Yellow Inj
    520 cc = 350 WHP
     
  2. orange_beastie

    orange_beastie Pickup driftin

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    this is a little vauge wot car/engine are these for?
    as my skyline is running standard injectors at 5bar and i get nearly 400bhp at about 15-16psi of boost.
     
  3. jon1200

    jon1200 Active Member

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    what injectors are you running?
     
  4. orange_beastie

    orange_beastie Pickup driftin

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    the standard purple ones that came in the r33gtst..
     
  5. Stavros

    Stavros Active Member

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    He means 4cyl.

    And being wheel figures these are very different from the bullshit flywheel numbers we use in the UK.

    For a 6cyl the max you gonna get is 1bhp per 1cc, so 440cc inj gets 440bhp, and so on, at the fly.
    Usually less to be honest as that means fair lean running etc.
    Id call bullshit on more than that.
     
  6. orange_beastie

    orange_beastie Pickup driftin

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    ahh i see mybad :smash:
     
  7. jon1200

    jon1200 Active Member

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    So guess it is usefull then :)
     

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