Jump to content
SAU Community

Overboosting At 5000rpm

mags33

By mags33,
in Engines & Forced Induction

 Share

Recommended Posts

mags33 Newbie

mags33

Posted
Posted

Hey guys, have an overboosting problem with my r33 gtst s1 with the wastegate fully open. It makes no boost with the gate open until 5000rpm where it builds up very quickly to 14psi + . Being a GCG highflow I sent it back to them thinking the wastegate needed to be bored out. . The wastegate was bored out to the largest size possible with a new flap assembly. Got it back and still have the problem. I have also checked the cat for anything restricting flow and that the wastegate is not rubbing on the dump, both are fine.

mods:

power fc

power fc EBC

GCG highflow

batmbl dump

3in exhaust after cat

any thoughts welcome, cheers...

mitch.

Link to comment
https://www.sau.com.au/forums/topic/142025-overboosting-at-5000rpm/
Share on other sites
WogsRus Veteran

WogsRus

Posted
Posted

my mate has same problems, exacty thesame. Give a ydawak PM. he is usually on every couple of days. But so far the turbo has been off 3 times to fix it, turns out the way the turbo was put back together, ment the westage was not openning fully or something. He has yet to get the car back after having everything put back together, so wait and see

r33_racer Grand Master

r33_racer

Posted
Posted

check you have the hoses for your ebc plumbed in for internal gate, not external. There are three possible fittings on the solenoid unit, i think you want for internal the middle one and one of the side ones..check the apexi handbook for setup.

WogsRus Veteran

WogsRus

Posted
Posted

it's actually something to do with the angle of the wastgate actuator to the push rod that opens it. My mate, broght a CGC turbo, same problem, it was ok on the bench, but as soon as it was bolted to the car, and the wastage rotaed round to fit the engine bay, it simply made boost and it could not be limited back.

mags33 Newbie

mags33

Posted
  • Author
Posted
check you have the hoses for your ebc plumbed in for internal gate, not external. There are three possible fittings on the solenoid unit, i think you want for internal the middle one and one of the side ones..check the apexi handbook for setup.

Hey guys thanks for the replys, the ebc should not come into play because the actuator arm is disconnected and I wired the wastegate open, so it shouldn't make boost, but it still does..

thanks again for you imput...

cheers mitch.

cameron Mentor

cameron

Posted
Posted (edited)
Hey guys thanks for the replys, the ebc should not come into play because the actuator arm is disconnected and I wired the wastegate open, so it shouldn't make boost, but it still does..

thanks again for you imput...

cheers mitch.

Woop,

Another one that does the same, unsolved mistery!

This is the 4th R33 that has this problem...

We have just about tried everything from dumping the exhaust to getting a new hks turbo! still boost creep at 5000rpm...

Same thing with the wastegate flap fully open, makes 15 or so psi!

Oh with the flap fully open it will make some boost should be a max of 7psi at around 7000rpm... but 14 and more aint normal.

Edited by cameron

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

    • Murray_Calavera
      Steps to DIY sanding car back ready for respray....

      By Murray_Calavera · Posted

      Yeah in that case, pulling the dent out. Event a very slight dent can create a lot of work filler-wise and there is a strong chance the panel won't be the factory shape when you are done (as the dent will result in a new high point created somewhere, then everything is brought up to that new high point... but the panel shouldn't be that high if that makes sense).  So you've filled and primed the panel and it is flat, why would you go back and remove the primer and add more filler? 
    • CRSKmD
      R32 Sedan - Grip and Drift (have my cake and eat it too build)

      By CRSKmD · Posted

      Something else I have been faffing with while the car was off the road is making the AC work. Assuming the car isn't at a thermal limit the idea of having AC while waiting in line to go on track sounds delightful. I have actually been lugging around the weight of the entire system since 2018 when the RB25NEO went in without it working at all.  The main reason was in the first few events before I got around to re-gassing it the rubber hose that runs under the manifold had the factory heat wrap/sleeve fail resulting in this: ~2 years ago I purchased a complete used R32 AC line set but when I finally went to install it the line i needed was different where the expansion section is I found a local place that was able to replace the rubber section and re-crimp. They also added some modern heat sleeve to the hose Tight fit but fingers crossed this is the last physical piece of the puzzle needed
    • CRSKmD
      R32 Sedan - Grip and Drift (have my cake and eat it too build)

      By CRSKmD · Posted

      the top black section is bonded to the silver section with some form of rubber. I assume to isolated NVH from the box
    • GTSBoy
      R32 Sedan - Grip and Drift (have my cake and eat it too build)

      By GTSBoy · Posted

      Plan B? Get someone to machine up a metal bush/collar/whatever it needs to be to replace the rubber? I haven't had a close look at that part recently to have a proper feel for whether that's possible. But it might be easy.
    • CRSKmD
      R32 Sedan - Grip and Drift (have my cake and eat it too build)

      By CRSKmD · Posted

      I do not want to install a short shifter and the only other stock throw shifter I have seen is the Nismo "Rigid shifter" for $290 So plan A is to fill it with sikaflex to stiffen it up and hope for the best
×
×
  • Create New...