R34 Gtt Problem

[Shelford93]

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 June 11, 2013 by Shelford93

[wolverine]

Nistune (or any aftermarket ecu) + tune = rich and retard gone

Needless to say if you search "rich and retard" either in google or SAU search engine you will have plenty of information to trawl through.

[Ben C34]

f**k! you always need a tune.

[Shelford93]

Sweet fair enough. So do you have any recommendations for a dealer or tuner either on this forum or on the Queensland coast, brisbane or Sunshine Coast area?

[jase_c]

sounds like you are hitting boost or fuel cut

[Shelford93]

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

[Sinista32]

Perhaps actuator

[Shelford93]

Yes true. How would one test an actuator?

[scotty nm35]

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...

[Sinista32]

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 June 11, 2013 by Sinista32

[Shelford93]

I am looking into a nistune, done by east coast customs in brisbane, has anyone had any experience with these fellas before.

Thanks for you help guys

[r34unit]

I'm running a fmic tbe and I'm on 12psi and I don't see any problems in my r34.

[r34unit]

Oh yeah standard every thing else !

[jase_c]

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

[Tommmay]

How close is your afm to your filter

Oil filters are not the best near AFMs

[Shelford93]

Yeah I have used some sensor clean on my air flow sensor and it doesn't seem to make a difference.

Thanks jase_c would be interesting to see if it's the same

[RandomHero83]

I recommend EFI for Nistunes, Sean did the Tune on my 32 and it was crazy good when I got it back.