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  1. #1
    Jah Guide
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    Default Inj Size And WHP Output,

    --------------------------------------------------------------------------------

    This is a conservative rating at 3 bar. * indicate side feed or top feed inj 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 Nissans with Fuel Presure 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 inj 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 emmisions station becasue of better fuel atomization.

    All Nissan Side feed injs are high impedence

    For Low Impedance injs use 6.8 ohms 10 watt resister

    The GTIR 444cc Inj is low impedence

    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
    VR38DETT = 570cc 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
    ---------------------------------------------185 cc @ 4 bar = 142 WHP
    231 cc = 156 WHP
    259 cc = 175 WHP * Red SR20DE
    ---------------------------------------------259 cc @ 4 bar = 203 WHP
    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 = 305 WHP * Brick Brown SR20DET ( S15 )
    ---------------------------------------------444 cc @ 4 bar = 351 WHP
    462 cc = 312 WHP
    509 cc = 342 WHP
    555 cc = 373 WHP * Yellow
    ---------------------------------------------555 cc @ 4 bar = 423 WHP
    570 cc = 380 WHP * BLUE R35 GTR
    ---------------------------------------------570 cc @ 4 bar = 440 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 = 240 WHP * GREEN SR20VE 20V P12

    444cc = 299 WHP * YELLOW RNN14 GTIR

    444cc = 299 WHP * YELLOW SR20VET

    570cc = 380 WHP * BLUE R35 GTR




    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
    Last edited by Andreas Miko; 07-20-12 at 08:45 AM.
    Good Thoughts Bring Good Vibes Which Bring Good Reasoning

    I Am A JWT Dealer And VRS Dealer.

    If you need any help 305-282-3643

    I sell SR20VE, SR20DE and SR20DET motors

  2. #2
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    Default

    Sticky sticky...

    Maybe we could start adding the injector latencies for certain injectors, at certain voltages?

    Someone asked the question this morning and I got the answer, but I think it would be a good idea to add to this list.

    For instance:
    740cc Deatschwerks Injectors (Manufacturer's data)
    1.94ms @ 9VDC
    1.71ms @10VDC
    1.57ms @ 11VDC
    1.4ms @ 12VDC
    1.3ms @ 13VDC
    1.22ms @ 14VDC
    SR20DEEPMD
    '12 Subaru Legacy

  3. #3
    Weekend Warrior
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    Default

    Quote Originally Posted by TeKKiE View Post
    Sticky sticky...

    Maybe we could start adding the injector latencies for certain injectors, at certain voltages?

    Someone asked the question this morning and I got the answer, but I think it would be a good idea to add to this list.

    For instance:
    740cc Deatschwerks Injectors (Manufacturer's data)
    1.94ms @ 9VDC
    1.71ms @10VDC
    1.57ms @ 11VDC
    1.4ms @ 12VDC
    1.3ms @ 13VDC
    1.22ms @ 14VDC

    ^This is a good idea. We even a flywheel info thread, I know we can get one of these going.
    Bend But Don't Break
    93 SE-R Project 2Door - 2.0VE Gio tune - built 2.3VE up next.
    93 XE-R Project 4Door - DE+T - Money Pit.
    Building N/A and Boost, the best of both worlds.
    Quote Originally Posted by SR20GTi-R View Post
    NA is a thinking man's game, alot of people dont have the stomach to play NA.

  4. #4
    SR20 Veteran/ Nissan Tech
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    Default

    Quote Originally Posted by Andreas Miko View Post
    00-02 USDM SR20DE RR = top feed injs
    does anyone know what size/flow rating these are?
    92 SE-R "BRE" Autocrosser!:bigthumbup:

    71 MGB/GT "The Great Pumpkin"

    07 Frontier SE/Nismo.... Daily Driver

  5. #5
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    Default

    They are 259cc injectors, last I had checked.
    SR20DEEPMD
    '12 Subaru Legacy

  6. #6
    Sr20det B12 to be
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    Default

    is it just the msd top feed injectors that dont like 4bar or all top feeds?
    1990 B12 MKII undergoing Sr20DET conversion, one day
    http://www.sr20-forum.com/showthread.php?t=342 clickey clickey

    Quote Originally Posted by 91grayDET View Post
    There are 2 types of asses in this world i like to look at, Hot chicks and Skylines.
    Whats so bad about turbo lag? It gives u a chance to wave at the guy next to u b4 u take off :)

  7. #7
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    Default

    Just the MSD's IIRC. I haven't heard of anyone locally running with topfeeds other than MSD's at over 59psi of pressure having issues.
    SR20DEEPMD
    '12 Subaru Legacy

  8. #8
    Jah Guide
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    Default

    Quote Originally Posted by Andreas Miko View Post



    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.

    Taken from up top.
    Good Thoughts Bring Good Vibes Which Bring Good Reasoning

    I Am A JWT Dealer And VRS Dealer.

    If you need any help 305-282-3643

    I sell SR20VE, SR20DE and SR20DET motors

  9. #9
    Sr20det B12 to be
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    Default

    i understand that. so its just the MSD injectors?
    1990 B12 MKII undergoing Sr20DET conversion, one day
    http://www.sr20-forum.com/showthread.php?t=342 clickey clickey

    Quote Originally Posted by 91grayDET View Post
    There are 2 types of asses in this world i like to look at, Hot chicks and Skylines.
    Whats so bad about turbo lag? It gives u a chance to wave at the guy next to u b4 u take off :)

  10. #10
    Jah Guide
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    Default

    Quote Originally Posted by L4t3ncy View Post
    i understand that. so its just the MSD injectors?
    I am trying hard to understand why this is so hard.

    My quote below form the begining of the page.


    Quote Originally Posted by Andreas Miko View Post

    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.

    Now if you read the last line it clearly states MSD Injs do not run right at 4 bar so don't try it.

    I does not say Nissan, MSD and some other brands do not run right at 4 bar so don't try it.
    Good Thoughts Bring Good Vibes Which Bring Good Reasoning

    I Am A JWT Dealer And VRS Dealer.

    If you need any help 305-282-3643

    I sell SR20VE, SR20DE and SR20DET motors

  11. #11
    Sr20det B12 to be
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    Default

    ok thanks. sorry for the noobness
    1990 B12 MKII undergoing Sr20DET conversion, one day
    http://www.sr20-forum.com/showthread.php?t=342 clickey clickey

    Quote Originally Posted by 91grayDET View Post
    There are 2 types of asses in this world i like to look at, Hot chicks and Skylines.
    Whats so bad about turbo lag? It gives u a chance to wave at the guy next to u b4 u take off :)

  12. #12
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    Default

    Guess I'll be swapping my injectors now lol. Thought the stockers were good for more than 175. To add to it mine probably have 200k miles on them as well lol.

  13. #13
    Master
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    Default

    Does the Ecu NEED to know that im running four bar or can I just turn the pressure up at idle and compensate with my SAFC?

  14. #14
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    Compensating with the SAFC is the same as the ECU being programmed for 4bar. The ECU doesn't really KNOW you're running at four bar, it's what you program as the K value, etc.

    For instance, we know that 370cc injectors at 4bar are ~420cc injector equivelants. Now you just need the K value for 420cc injectors w/ your specific MAF, as well as fine tuning the latency values etc. and you're done.
    SR20DEEPMD
    '12 Subaru Legacy

  15. #15
    SR20 Veteran/ Nissan Tech
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    Default

    ok so i have a few questions....

    im working on trying a GTi-R manifold/plenum assy on my 10:1 DE(w/shaved head and .020 head gasket.... so obviously more than 10:1). the ECU is for stock 259 side feeds.

    so... if i go to B15 (00-01) Grey 259's... the mapping should stay the same, at least for a starting point, assuming i have the same fuel pressure, right? there isnt anything hidden that im missing, is there?

    according to the FSM, the B15 injectors should be 13.5-17.5 ohms, and the B13 injectors are 10-14 ohms. sound right to you guys, or will i need to put resistors in it?
    92 SE-R "BRE" Autocrosser!:bigthumbup:

    71 MGB/GT "The Great Pumpkin"

    07 Frontier SE/Nismo.... Daily Driver

  16. #16
    The People's Mod
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    You should read this:
    injector impedance

    Also, start your own thread.

    Also, you can expect to get slightly less fuel with the B15 injectors I think.

  17. #17
    SR20 Veteran/ Nissan Tech
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    sweet thanks. if i dont get a difinitive answer on the thread you posted i'll start a new one.

    and if it does go lean i'll find another route. like i said its a trial run. im not sure it will even idle. im doing all the mounting stuff on my original US highport, which has a good bottom end but what i suspect is a warped head (im thinking eventually that bottom end will get a VE head.)
    92 SE-R "BRE" Autocrosser!:bigthumbup:

    71 MGB/GT "The Great Pumpkin"

    07 Frontier SE/Nismo.... Daily Driver

  18. #18
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    So I have a question. Are these figures taking into consideration that with a boosted app the regulater will keep increasing pressure under boost? Or are these whp figures just based off the base pressure?
    2.0 218/153- 12.9@106
    2.3 270/190- 11.6@116
    2.4 285/210- 11.5@118
    Retired...

  19. #19
    Jah Guide
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    Quote Originally Posted by cory View Post
    So I have a question. Are these figures taking into consideration that with a boosted app the regulater will keep increasing pressure under boost? Or are these whp figures just based off the base pressure?
    Cory

    Just ask yourself why does the fuel presure go up when you go into boost and then you will have your answer.
    Good Thoughts Bring Good Vibes Which Bring Good Reasoning

    I Am A JWT Dealer And VRS Dealer.

    If you need any help 305-282-3643

    I sell SR20VE, SR20DE and SR20DET motors

  20. #20
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    it goes up because its seeing pressure, I understand that, but I was wondering if these calcs are figures before any pressure has increased the fuel pressure. I figure how often are guys running 600cc injs in an na set up that's why I was asking...
    2.0 218/153- 12.9@106
    2.3 270/190- 11.6@116
    2.4 285/210- 11.5@118
    Retired...

  21. #21
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    Idk maybe I'm missing something lol
    2.0 218/153- 12.9@106
    2.3 270/190- 11.6@116
    2.4 285/210- 11.5@118
    Retired...

  22. #22
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    If only we were all as smart as Miko.

  23. #23
    Jah Guide
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    Quote Originally Posted by cory View Post
    Idk maybe I'm missing something lol
    NA motor injector 370cc @ base 44 PSI

    flows the same as

    Turbo injector 370cc @ base 44 PSI ( 10 PSI boost presure 54 PSI fuel presure )


    Think about it for a second and you will understand
    Likes gti-r93 Liked this post
     
    Good Thoughts Bring Good Vibes Which Bring Good Reasoning

    I Am A JWT Dealer And VRS Dealer.

    If you need any help 305-282-3643

    I sell SR20VE, SR20DE and SR20DET motors

  24. #24
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    Anyone know if denso 75lbs injectors are a good choice for a det? Should get me to about 530whp? fyi going on a rwd sr20det.

  25. #25
    Master
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    Can we Sticky this please? I thought it was stickied but I had to look for it. I think alot of people check this thread because I use it as a reference all the time.

  26. #26
    This will not end well
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    Quote Originally Posted by Johnny wangwang View Post
    Can we Sticky this please? I thought it was stickied but I had to look for it. I think alot of people check this thread because I use it as a reference all the time.
    its in the manifesto and that is sticky'd.
    1992 NX2000 - GTX28 - RS6
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