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Rb25det c33 sputters at 5k or over 0.5 bar boost

Reecejc33
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Reecejc33 Newbie

Reecejc33

Posted
Posted

Hello everyone I know this topic has been covered a multitude of times but It’s always been plugs and coils plugs and coils, so I bought my c33 about a month ago with an Rb25det series 1 swap car runs idles very well under 5k rpm builds about 0.5 bar of boost but whenever I go WOT after 5k the boost seems to spike to about 1.0 bar of boost causing the car to spit and sputter almost like a limiter/anti lag sound I have recently replaced the coil packs brand new oem and plugs gapped to .8 igniter has been tested and in working condition engine is completely oem from an r33 gtst only thing after market is a Down pipe and a walboro fuel pump any help would be appreciated like I said I know this has been covered but no one seems to include the boost spiking like mine does, thank you

GTSBoy Grand Master

GTSBoy

Posted
Posted
35 minutes ago, Gojira34 said:

No I don’t mean the turbo itself, the ecu can’t handle more than 10psi.

No, not true.

What is true is that the high load high rpm corner of the fuel map is disgustingly rich and the equivalent corner of the ignition map is disgustingly retarded. This means that the engine will drink fuel, make black smoke and no more power as you increase boost above ~ 10 psi. It becomes pointless. And there's nothing you can do to fix it (easily) in an R33 ECU, because there's no easy reprogramming option. R32 and R34 will happily take a Nistune board. R33 (ECU) is the red headed step child that no-one loves.

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