Tuning RB25DET NEO

Thread in 'Technical Questions' started by RedDuckRacing, Nov 14, 2015.

  1. RedDuckRacing

    RedDuckRacing New Member

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    Hi guys, im curently swapping my R33 with a NEO and am looking for some advises for powerupgrades. Going for 450-460hp and 550-600nm.
    Setup:
    Honed block with new rings and polished head.
    Masterpower T3 ar.71 turbo (with upgrade internals and jacket)
    ACL bearings
    Custom twinscroll manifold
    Custom intake manifold
    750cc injectors
    044 fuelpump
    60L fuelcell
    Nuke fuel filter
    Spitfire coilpacks
    NGK BKR7EIX plugs
    Cometic stealheadgasket
    38mm Tial Wastegate
    Apexi intercooler
    Japspeed oilcooler
    Custom oil resticktors and return
    Performance timingbelt
    3" sidepipe exaust
    100mm throttlebody
    Megasquirt 2 ECU
     
    #1 RedDuckRacing, Nov 14, 2015
    Last edited: Dec 9, 2015
  2. BenRice

    BenRice Well-Known Member

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    T3 will run out of puff. Go for something bigger, Holset and RB25 are a proven match. And look to go for a 60mm wastegate too for better boost control.

    Injectors will be on the small side, go for 800cc to be safe. Would also go ARP headstuds too

    What clutch you running? Am guessing twin plate at this power level. And stock up on axles, or try find a GTR rear end.
     
  3. C35Rob

    C35Rob Member

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    444's are too small, you don't need a 100mm throttle body, don't bother with MS2, get a MS3.
     
  4. RedDuckRacing

    RedDuckRacing New Member

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    Thinking about the ARP studs also Yes :)

    Seen this setup making 508hp at 1,3Bars on the GTR injectors.

    Using a SPEC stage 4 clutchkit.
     
  5. RedDuckRacing

    RedDuckRacing New Member

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    The MS2 is fine for me, dont need alle the MS3 features, and its only 1000£ fully installed and track ready.
    The 100mm throttlebody is welded on the intake (wanted 80mm but can't afford to shift it)
     
  6. Stavros

    Stavros Active Member

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    Stock inlet would've been fine, in fact better.

    T3 flange turbo is fine, but T3 turbo, too small.

    Any car that got over about 440bhp on GTR injectors is a bullshit dyno. Even 1bhp per cc/min with 6x injectors is almost impossible and a bit risky.

    Wastegate is fine, deffo don't need a 60mm, a 38mm will be fine even.
     
  7. RedDuckRacing

    RedDuckRacing New Member

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    The turbo i rated to 620hp's (but has got upgrade internals) and made 448hps at 1bar on my friends RB25 (see pic) so it'll do the job just fine.

    The injectors is my biggest concern but it has been proven before (i have seen it).

    [​IMG]
     
  8. Stavros

    Stavros Active Member

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    If the turbo is fine, it's fine. It's not a T3 as we know it then, just T3 flange. Some T3 flange turbos are good for 700bhp, no problem there.

    Believe what you like about injectors, but it's fact. Anyone can make a dyno read anything, but there's no magic with injectors.
     
  9. RedDuckRacing

    RedDuckRacing New Member

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    Anyone use lightweight flywheel? I have been using a Stock RB26 flywheel but i Think its to heavy :/
     
  10. yannixx

    yannixx New Member

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    I'm using a lightweight exedy flywheel with a exedy organic clutch and it's the easiest car I've shifted. (R34 GTT Neo with around 300bhp).
     
  11. RedDuckRacing

    RedDuckRacing New Member

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    Cool, think i'll try a stock rb25 wheel slightly lightet, some people told me something about the inertia would be wrong, and i would have problems with keeping up the rpms caus i'll drop to fast, and also i would lose a lot of torque..
     
  12. Stavros

    Stavros Active Member

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    You need to stop listening to who ever you listening to, as they haven't got a clue.

    None of that is correct.
     
  13. RedDuckRacing

    RedDuckRacing New Member

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    "They", are Danish pro drifters who knows what they are talking about, but ofc. i don't need a flywheel with Stock weight, im thinking of 7kg/15,5lb, remember my clutch is only sintermetal so that is'nt heavy at all :)
     
  14. Stavros

    Stavros Active Member

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    You don't lose torque and even with 3kg flywheels there's no rev drop problem.

    Maybe people drive different to me, but...
     
  15. diamondsink

    diamondsink Kyouto Drift

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    The stock inlet and TB should done 600+ without problem. Your going to want 550-600cc injectors.
     
  16. RedDuckRacing

    RedDuckRacing New Member

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    600+ what? Hp? Im looking for some 750cc at the moment Yes
     
  17. Mr Bizzle

    Mr Bizzle In Safe Hands

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    Standard Unopened block
    Standard Inlet manifold and throttle body
    Standard Exhaust Manifold
    Standard Flywheel
    Standard Timing belt
    1.1mm mls head gasket
    ARP head studs
    Garrett GT3071R
    740cc ID injectors
    Cheap copper 7 grade plugs
    Oil cooler
    Some sort of clutch that'll take the power
    Any old eBay intercooler
    Any old eBay exhaust with any old eBay turbo elbow
    Decent Aeromotive Fuel Pressure Regulator
    Link G4 or Haltech Elite 1500 or Platinum Pro with boost solenoid

    Then read this and do the oil restrictors and return while the head is off.

    Anything else is just waisting your money.

    The above will give you 500hp. Which is bonkers levels of power. If you want anymore than 500 reliably then you're better of fitting pistons. The NEO engine will do more power, sure - but it's a question as to how long it lasts. Some will do 600 on a standard block no problems. Some crap out at 520. It's down to the map and the person driving/looking after the car.
     
    #17 Mr Bizzle, Nov 26, 2015
    Last edited: Nov 26, 2015
  18. H05TYL

    H05TYL Member

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    You forgot a bigger fuel pump :p

    Seriously though, that list is absolutely the most cost effective way of reaching your goal.
     
  19. RedDuckRacing

    RedDuckRacing New Member

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    Cost effective Yes but i dont Think there is room for that Big a turbo on the Stock manifold? Also im not sure how fast the boost would kick in?
     
    • Creative Creative x 1
  20. H05TYL

    H05TYL Member

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    You need a 10mm spacer to fit on a stock manifold. This is a gt3076r on an R33 rb25.
    [​IMG]

    As far as when/how the boost kicks in, I've quoted my mate who owns the cars thoughts:
    .82 rear internal gate housing. That's 362 wheel horsepower on 1bar/15psi
    [​IMG]
     

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