GTX2863R on 98 Octane - what size injectors?

Discussion in 'Technical' started by chewy, Aug 22, 2016.

  1. chewy

    chewy Active Member

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    What size injectors should be used for 98 Octane fuel with GTX2863R running at their max boost of 36psi?

    And if anyone knows what size injectors for GTX2867R @ 32psi boost?

    I've read lots of varying answers so would like to know from someone who actually runs these turbos.
     
  2. Fists

    Fists Well-Known Member

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    This might help.

     
  3. kickerzx

    kickerzx Member

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    Well you are NOT going to run 36psi on 98, thats for sure.
    On 98 the 740 will be alright as long as the rest of the fuelsystem is upgraded. Fuellines included
     
  4. Zano

    Zano Member

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    I'm heading that way, onnnne day lol.
    Injector dynamics 1000cc or 1300cc are the common choice for the GTX2863's and the big builds.
    I chose ID1000cc for mine : 0
     
    Last edited: Aug 23, 2016
  5. MagicMike

    MagicMike Moderator Staff Member

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    No real benefit on using gtx without big boost (ethanol).

    98 only, 1000s will do. But with your build, why stop there. Do it once, do it right.

    I am using bosch 1650s.
     
  6. badxtc

    badxtc kirby's bitch

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    Id 1700. With a triple pump set up.
    Id 2000. With 4 pump set up.

    Either one will do the trick.
    70 or 80 psi full flight should do the trick..
    I would run 6k rpm and 7k rpm a little richer as well.
    Alow 500rpm for over rev as well. Limit to 7500.
     
  7. BLACK BEAST

    BLACK BEAST SLICKTOP TT R-SPEC

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    This is what you run with E85 with 50psi fuel pressure .
    plenty
    .

    .

    I'm maxing out my ID1300cc with dual pumps (which will make 600rwkw)

    On 98 1300cc injectors are better (and handle E85 WHEN you convert :p)
    (The ID1300 has a minimum fuel mass compatible with gasoline use, and will provide exceptional idle and cruise behavior under these conditions)

    8AN fuel feed/return on E85. minimum

    You wont run more than 24psi on 98 (even then you are pulling back timing to be safe)

    Both turbos GTX63 and 67 will make up to 600rwkw on E85
    I would run the GTX63 as it will spool better and doubt you will make more power with the GTX67 as the GT28 NS111 turbine wheel with the .64 is at its flow limit.

    .
    If you want bigger go GTX2967R :zlove:


    .
     
  8. SRB-2NV

    SRB-2NV #TEAMROB

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    36PSI and 98RON fuel, that's cute. You NEED ethanol to run that much boost, full stop.
     
  9. ProckyZ89

    ProckyZ89 Senior Member

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    If on 98 you'll find 23-26 will be your peak

    You'll only just start seeing a gain from gtx/gt at that level.

    750cc will cover the comfortably and can be in side feed if funds are an issue with a single walbro 460

    If you want to unleash the potential.
    Twin in tank pumps
    With 1300 and some line work will see you there but pray you have a strong head set up / studs as US guys have seen some head lift issue that high
     
  10. chewy

    chewy Active Member

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    thanks. Most likely will go with 1300cc with BDE top feed rails

    Just need to work out what machining is done to the lower plenum injector ports to get the injectors to sit at standard height. I'm hoping the right sized end-mill bit plunged into the existing ports to the base of the countersunk hole is all that is needed.



     
  11. rob260

    rob260 Moderator Staff Member

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    With the newer kits you don't need to machine the lower plenum -shoot me a PM if you have any questions I have both types of kit sitting here and happy to explain anything (including specs for machining to suit glue in adapters if that's what you're after)
     
  12. chewy

    chewy Active Member

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    don't the new ones make the injectors sit 11mm higher

    I would think that might affect the spray pattern.

     
  13. rob260

    rob260 Moderator Staff Member

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    That's right -any bolt on adapter (regardless of brans/kit) is going to sit the injector higher than OEM position although for most people this preferable to machining the lower plenum and the cars that I have fit to or supplied for don't seem to know the difference. If you're a stickler for detail and want stock injector depth then yes machine lower plenum and glue old style adapters in. I have both here and can supply machining specs for retaining OEM depth. If you're planning to use 1300cc injectors at OEM depth you'll need specially machined adapters due to the position of the connector on the injector body -I have those too ;)
     
  14. BLACK BEAST

    BLACK BEAST SLICKTOP TT R-SPEC

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    no entirely right ?

    part of the reason I run my fuel set up is because of spray pattern and position

    here is mine ...series 2 plenum with winfactory top feed .. allows the injector sit close to oem.
    series 1 obviously is a different story


    [​IMG]
     
  15. rob260

    rob260 Moderator Staff Member

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    Hi Rob only said slightly higher than stock as you can see with that step. If you wanted it to sit flush you'd have to machine the seat inside the lower plenum. Series 2 would definitely be ideal shame the heads are NLA.
     
  16. BLACK BEAST

    BLACK BEAST SLICKTOP TT R-SPEC

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    Oh really no longer available?
    Z1 ?

    Motor value just went up :)
     
  17. rob260

    rob260 Moderator Staff Member

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    yeah Nissan have nil stock -might be some 3rd party retailers that still have stock but certainly making any more
     
  18. Z32 TT

    Z32 TT Active Member

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    i have 2200cc with the bolt on adapter and Magnafuel 750 fuel pump with surge tank. More than enough fuel but after running out last time I don't want it to ever be a problem especially with dry nitrous.

    Turbos will be gt2871 with gtx wheel and .86 housings running so hot I'll weld with the air :D

    I agree about injector positioning but povo spec slap together build can't justify it.
     

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