Jump to content
SAU Community

Rb25Det Not Boosting Well

rb25debt

By rb25debt,
in Engines & Forced Induction

 Share

Recommended Posts

rb25debt Contributor

rb25debt

Posted
Posted

Hi guys, i have a r32 with a rb25det neo in it from a rs4 Stagea. Car was originally auto but is now manual converted.

the problem i have is, it will boost up to around 8 psi and the gate opens. But it doesn't really feel like its boosting. Its also a bit hesitant.

It has a master power t04e, front mount, all the basic mods. Ive only recently got it and have just began tidying it up. I'm pretty sure it hasn't been tuned for the t04e so that could be the problem. But the thing is when it hits boost it almost feels like its letting all the boost out, sort of like a exhaust leak.

Im just learning things atm and trying not to use the turbo in the mean time.

Any ideas?

Thanks for any help guys

Link to comment
https://www.sau.com.au/forums/topic/449751-rb25det-not-boosting-well/
Share on other sites
GTSBoy Grand Master

GTSBoy

Posted
Posted

Nonononononojnononopnonononodondonondonooooooo

You can't try to boost up a Neo ECU past about 11 psi on a STANDARD turbo without causing it to clip the air-flow meter, hit the boost limit (there is a boost sensor connected to the crossover pipe) and various other shits and giggles.

If you try to boost it up on a BIG turbo, then expect the shits and giggles to start happening at lower boost. 8 psi would be about right.

The thing will make boost, but the ECU will overfuel and cut timing so badly that it will be slow slow slow. Push it further and they will actuall give you a very nasty hard cut.

If you keep driving it like this you will damage it. You have to either piss that shitful turbo off or do something about the ECU (and the AFM and the injectors and probably the fuel pump).

rb25debt Contributor

rb25debt

Posted
  • Author
Posted

Nonononononojnononopnonononodondonondonooooooo

You can't try to boost up a Neo ECU past about 11 psi on a STANDARD turbo without causing it to clip the air-flow meter, hit the boost limit (there is a boost sensor connected to the crossover pipe) and various other shits and giggles.

If you try to boost it up on a BIG turbo, then expect the shits and giggles to start happening at lower boost. 8 psi would be about right.

The thing will make boost, but the ECU will overfuel and cut timing so badly that it will be slow slow slow. Push it further and they will actuall give you a very nasty hard cut.

If you keep driving it like this you will damage it. You have to either piss that shitful turbo off or do something about the ECU (and the AFM and the injectors and probably the fuel pump).

Ok sweet as man, theres not much that can be done with a neo ecu aye. would my best option just be to put a standard 25det turbo on it? I don't want to make big power, i'd prefer it to be reliable and standard.

GTSBoy Grand Master

GTSBoy

Posted
Posted

Ok sweet as man, theres not much that can be done with a neo ecu aye. would my best option just be to put a standard 25det turbo on it? I don't want to make big power, i'd prefer it to be reliable and standard.

Yes, there is something you can do about the Neo's ECU. It is actually far better than an R33 ECU in that regard. You can get it Nistuned (which is a tunable daughterboard which gets installed inside the ECU) for, well, about $600 I guess. If it then needs to be tuned you pay for dyno tuning too.

You'd actually be well advised NOT to put a std 25 turbo on there. They are all getting a bit old. They are ceramic. They can and will die at random.

I suggest that you do some searching on here amongst the millions and millions of posts about what a good turbo option would be for you. I'm not going to type it all out again.

rb25debt Contributor

rb25debt

Posted
  • Author
Posted

Yes, there is something you can do about the Neo's ECU. It is actually far better than an R33 ECU in that regard. You can get it Nistuned (which is a tunable daughterboard which gets installed inside the ECU) for, well, about $600 I guess. If it then needs to be tuned you pay for dyno tuning too.

You'd actually be well advised NOT to put a std 25 turbo on there. They are all getting a bit old. They are ceramic. They can and will die at random.

I suggest that you do some searching on here amongst the millions and millions of posts about what a good turbo option would be for you. I'm not going to type it all out again.

Cool, cheers for the help man, i appreciate it. I'll look into the Nistune daughterboard as it sounds like the best option for me. I also noticed there was a hole in the hose that comes of the j pipe. Would you know what that part is called as i need a replacement one.

rb25debt Contributor

rb25debt

Posted
  • Author
Posted

If you're in Sydney and want a road tune for your basic mods for your Nistune I have both software, hardware and a portable wideband.

Cheers bro i live in New zealand though, i'm pretty keen on getting a Nistune

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
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • Dose Pipe Sutututu
      UniClutch

      By Dose Pipe Sutututu · Posted

      That ring thing is interesting how it's holding everything together 
    • elir32
      Rv37 400r questions

      By elir32 · Posted

      Hey guys. I have a 400R on its way to Australia from Japan currently and have a few questions I’m hoping others may be able to help with.   Wondering if anyone here has had any luck getting the Sat nav unit to work in Australia!? Assuming the Stereo is as simple as a band expanded and tv won’t work?  Seeing as they’re based off a Q50 which is Aus delivered is there any way to link that system to the nav? Nav modules and head unit are different part numbers and appear slightly different at the rear with plug ins etc. can I put my xtrail sd card into the rv37 and will that convert the maps or update to Australian? Has anyone got any advice here?     also has anyone fitted the factory remote start and Security system once it’s landed in Australia? I put an enquirey to Nissan Japan in via a third party, and they suggested it needs a Nissan Japan dealers device to setup and couldn’t guarantee if one here could do it or not. They can supply and I can physically fit it but to setup I would need a dealers device. Any information here would be appreciated also. I’ve seen one here with it fitted already prior to leaving Japan at a dealer/inporter, so clearly passes compliance and works when fitted Japan and doesn’t need changing here.      also, does the tyre inflation sensors work here? Does anything change with them when the vehicle arrives? Where are they actually situated? I’ve read they have batteries and they need to changing at times and seems like resetting involves the nav system?    any help here would be appreciated and any other aust specific information to help would be great. Looking forward to see what the current generation skyline is like and eager to see how many of the gadgets can be utilised here.  Thanks in advance 
    • Butters
      UniClutch

      By Butters · Posted

      Do need to take it with a pinch of salt. One of the adapter failures, they clearly had setup issues with the flywheel.  One of the slipping ones I spoke to and it was pretty clear the throwout was riding, rather than fix, just swapped to a new clutch.    These clutches are being put in anything from 5k offroad 4x4 beaters, GR yaris, 500hp commodores to 1200hp barra monsters. Bound to be some issues in some of them when they are not a simple bolt in affair due to the changes in height.    There is a lot going on in this picture and unless I did the job myself no way to tell what really happened. 
    • NZ-GTT
      R34 GTT Battery Relocation To Trunk

      By NZ-GTT · Posted

      I did this mod in 2019  You just have to modify the top bracket of the ABS/TC/Fuel Pump Control ECU so it sits more upright and closer to the back seat and run a good quality positive battery lead from the engine bay, the negative lead i just bolted down to the body in the boot.
    • Dose Pipe Sutututu
      UniClutch

      By Dose Pipe Sutututu · Posted

      Damn... Not the feedback I want to hear.
×
×
  • Create New...