Jump to content
SAU Community

Recommended Posts

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
Link to comment
https://www.sau.com.au/forums/topic/426825-r34-gtt-problem/
Share on other sites

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

Link to comment
https://www.sau.com.au/forums/topic/426825-r34-gtt-problem/#findComment-6886514
Share on other sites

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...

Link to comment
https://www.sau.com.au/forums/topic/426825-r34-gtt-problem/#findComment-6886811
Share on other sites

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
  • Like 1
Link to comment
https://www.sau.com.au/forums/topic/426825-r34-gtt-problem/#findComment-6886820
Share on other sites

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

Link to comment
https://www.sau.com.au/forums/topic/426825-r34-gtt-problem/#findComment-6887883
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • What does it look like with highway driving? And yes, I had a similar thought as Duncan. It looks quite similar in my Stagea and I have made myself accept it as normal. Might have to look into it some day  
    • While I was waiting for the new parts to come in for the charge pipe and radiator I decided to do some turbo modification. The drive pressure (exhaust backpressure) was a lot higher that I thought it should be. For 32lbs of boost drive was 55lbs. The turbine housing is a 1.10AR and my turbo builder has suggested to go to a 1.25AR. To test if a larger AR would do anything to reduce drive pressure AND not spend any money I decided to hog out the divider in my current housing. I removed it from the inlet and the whole way through the housing.  After reassembly and testing it doesn't look like this modification did anything for reducing drive pressure or requiring more fuel (making more power). Oh well, it was worth a shot. We'll get some data at the track if it makes it past the 60ft. I also machined a $7 shift knob off Amazon to fit my Stillway shifter since I didn't like the Stillway shift knob. Next on the list was the radiator replacement and fabrication of a new intercooler tube that had no silicon coupler. No pictures of this - I was short on time each night after work to get this done and didn't stop to take pictures.  Next was to get the clutch disks out and replaced. Previously when installing the dogbox I had ordered a set of the same sintered iron disks I had been running because I switched to the 26-spline input shaft. I thought it was odd that they didn't have any markings or brand name on them like all my old disks had but installed them anyway. At the track I could not get the clutch to lock up using my normal strategies. After two track nights I reached out to the clutch manufacturer and ask their thoughts. They said they had to switch the material out because they were having trouble getting the original material and that this new material would not take to being slipped very well.  So out with the first set of 26-spline disks and in with the correct material 26-spline disks. While I had the trans out I added an inspection/service hole. I've wanted one of these for a while. Now I can have a look at things and change the front cover shimming when needed (clutch wear). I hustled and got the clutch change done in a few hours on a Saturday. Hopped in the car and drove home. On the way home I did a 1-3 pull. When shifting from 2nd to 3rd the core plug in the back of the cylinder head popped out and dumped all the coolant. Thankfully I was only 30 seconds from home and coasted it there. Datalog showed nothing unusual and 2.5psi of coolant pressure. That plug has been in there since 1992 but I guess it worked its way out. Pulled the trans AGAIN and replaced the plug, JB welded it in, and made a brace. Also deleted the head drain I had added in during the bearing issue fiasco.  I am currently changing my boost control plumbing to make it cleaner. After that is done I'll make another attempt at getting past the 60.
    • Are you 100% sure this isn't tune related?
    • 140-150 across the board. At this point hoping the grounding harness fixes it. My grounds are all tied to the chassis and none to the battery. For SR and KA that’s never been a problem for me but had a few other guys here and Reddit who told me RB really like a very solid ground setup tied to the battery so going to try that next, I’m stumped if that doesn’t do it. Never had a car have spark and fuel and not fire off before. Only thing I can think is the spark is intermittent/weak because of grounds nothing else really makes sense at this point 
    • I am having close to the same issue. Can you help me with what wire you grounded to get your pump to trigger?
×
×
  • Create New...