Jump to content
SAU Community

R34 Help Over Boosting And Dont Know Why

gttiwanna

By gttiwanna,
in General Maintenance

 Share

Recommended Posts

gttiwanna Collaborator

gttiwanna

Posted
Posted

i have an r34 sedan

mods are:

front mount full 3in exhuast and 3in cat, pod filter no after market ecu

now the issue is that no matter what i do it always seems to wanna boost to at least 1bar i had a manual boost controll on it didnt fix the prob and just brought a new hdi ebc-r

and same thing isnt controlling the boost at all just seems to do what it wonts and answers people?

i have done a boost leak test on the cooler pipes once before and wasnt leaking

please help i wanna rev my car past 5 but hits boost cut/fuel cut hmmmmm??????

jjman Mentor

jjman

Posted
Posted

maybe the actuator diaphram is fkd...

If your wastegate can open then somewhere the signal of boost pressure in ur vaccum lines is not being translated to the actuator/opening the actuator properly...

RB25DETC33 Community Regular

RB25DETC33

Posted
Posted

Might sound like a silly question but do you have the vac lines connected correctly to the solenoid and actuator, I agree with JJMAN (I had this issue also at one stage), could be an issue with the boost pressure signal to the solenoid which is causing the wastegate to remain closed. Maybe a pic of your val line setup?

mad082 Grand Master

mad082

Posted
Posted

Why does the hose do a loop out of the cooler hose?

And does it boost up that high with no boost controller on there at all?

There seems to be an aweful lot of hoses in that pic. Try running a new hose from the intake plenum (such as.from the bov feed) straight to the wastefate and pull all those other hoses off and block them and see what happens

RB25DETC33 Community Regular

RB25DETC33

Posted
Posted

What is your boost controller set to in terms of pressure or percentage of boost?

Try disconnecting the solenoid an run a hose directly from the turbo to the waste gate do a run up the street. See if the new gate opens. If it does then maybe something to do with ur solenoid.

If they dont work try using another source of boost pressure further along the cooler piping like near the bov.

gttiwanna Collaborator

gttiwanna

Posted
  • Author
Posted

The hose coming out of the cooler piping is for the steering

As the piping I got didn't have a nipple I made one up

As the factory hose went there :)

I don't know what the controller is set at coz no matter where I set it it always boost to 1 bar or lil bit higher

And on that note changed my bov back to an after market one yesterday and its not very loud at all

And it use to be very loud :/

And the boost solinod is brand new only 1 day old so can't be broken

RB25DETC33 Community Regular

RB25DETC33

Posted
Posted

Well the wastegate should open when u hit boost pretty much straight away when connected directly to a pressure soucre as there is no solenoid valuve in the way. A manifold leak wont increase boost pressure as that is escaping exhaust not reaching the turbo.

What kind of turbo have u got fitted?

If the gate is still opening when ur on throttle and ur still make stupid boost level sounds like there could be a blockage preventing the exhaust from leaving through the dump.

RB25DETC33 Community Regular

RB25DETC33

Posted
Posted

Well the wastegate should open when u hit boost pretty much straight away when connected directly to a pressure soucre as there is no solenoid valuve in the way. A manifold leak wont increase boost pressure as that is escaping exhaust not reaching the turbo.

What kind of turbo have u got fitted?

If the gate is still opening when ur on throttle and ur still make stupid boost level sounds like there could be a blockage preventing the exhaust from leaving through the dump.

gttiwanna Collaborator

gttiwanna

Posted
  • Author
Posted

so heres a new one it was pretty average day hotish and i decided to block of the map/boost sensor(one on the back fire wall) and the boost was able to be controled

WTF???

so meaning is that thing stuffed ot what?

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

    • GTSBoy
      new 1.5 LSD issues/concerns

      By GTSBoy · Posted

      A 1.5 way is a 2 way. It is just a 2 way with a less aggressive ramp on overrun.
    • GTSBoy
      Boost cut after swap(RB25DET NEO) R34

      By GTSBoy · Posted

      The ABS and/or TCS being missing/broken will not cause the engine to misbehave. It just casues CEL to come on and annoy you. The CEL is useless if it is always on, so you have to do the things you have to do to get rid of it, so it can be useful. Being a Stag ECU, then yes, it will not expect TCS to be present. But it will expect ABS to be present and working. You will need to either make the ABS CU talk to the ECU (don't ask me what that will take on an NA R34), and make sure the hardware is working....or, you just need to blank it out in Nistune. Do not persist with the stock ECU. You will just have problems. Gte it Nistuned. Start from there. DO YOU HAVE A BOOST SENSOR? The ECU's boost sensor that it. It is connected to the loom at the rear of the coil cover. Usually rides on the firewall on an R34, but is usually bolted down to a bracket along with all the other crap at the back of the coil cover when a Neo is dropped into another car. If you do not have it, the ECU will shit the bed. So, do you have one?
    • Kapr
      Boost cut after swap(RB25DET NEO) R34

      By Kapr · Posted

      So sadly the fuel pump etc was not it. The pump and filter is new and it is still cutting around 4000 rpm. A read something about ABS/TCS (engine is from stagea and ECU too so no TCS) and i dont know for 100% that my car has ABS. It has ABS "cube" in engine bay but i dont think it works(or at least from my braking experience). Can be something like that?  I will be driving the car next week to Nistune tuner to properly see what is wrong...  
    • JC71
      new 1.5 LSD issues/concerns

      By JC71 · Posted

      the Tomei LSD fluid with lsd kit. frustrated that it was shaking the car to crap and affecting everything else negatively, I pulled the diff last night, and removed the lsd carrier, could not find anything wrong, however it seem to be 100 locked up acceleration, and deacceleration, wondering if they sent me a 2 way not a 1.5??  either way I installed the stock open carrier back in place. test drove everything smooth as butter again. no shake, shutter, random, what felt like clutch slip and grab or drive shaft play, etc. something differently wrong in side the lsd. I might bother taking it apart (if possible) to figure out what's going on inside this carrier, as bought too long ago to return.  only draw back is its back to a one wheel wonder.
    • TurboTapin
      Most women will agree that parking is the most taxing part of driving

      By TurboTapin · Posted

      What a time to be alive!!
×
×
  • Create New...