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Hello

So its sorta hard to explain, but ill try my best.

I have a 1998 R34 GTT Skyline, It has a rb25det NEO. It has no engine mods other then an oiled HKS Pod filter, Apexi Front mount intercooler and an Apexi AVC-R Boot contoller.

I have a problem (is most noticable in 3rd gear) where when i hit apoximatley 5000rpm power drops and from outside the car it sounds like im on red line apprently. I am still obtaining the same out of boost and injection percentage according to the Apexi AVC-R. When i set the boost at stock pressure the problem goes away. However the problem accours again when i turn the boost up. Starting at 9 psi and onward up to 11 psi! (i havent tried to go any higher) iver also tried it with traction control on and off and it makes no difference.

Please help, Do i need a tune or new plugs and coils, etc...

Thanks for your help, Im new to all this.

Alex

Edited by Shelford93
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jase_c I have hit boost cut before, this problem isn't as violet as that it doesn't jerk or throw me around it just looses power when I hit about 5000rpm and then it seems to get past it at about 6500rpm

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I would use a compressor and regulator, but you could perhaps use a bike pump and gauge?

Just remember the pressure it takes to open the actuator is completely different to where it will crack open normally, as the manifold is filled with pressure when the engine is running.

Best to simply leave it on low boost if bumping it up is causing issues, unless you tune it...

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Seems your running the stock ECU as you don't mention an aftermarket.

34GTT NEO's seem to always encounter this issue.

you could put an R32 actuator on there and stay on/around 10PSI

until you do get an aftermarket ECU or 'Nistune' and get it tuned as suggested by others.

Edited by Sinista32
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My 34 is doing something similar around 4500rpm under load on the dyno but i think it has something to do with maxing my air flow meter out (240kw). i have some video of it i might try and upload, see if its what yours is doing

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