Jump to content
SAU Community

Car Not Boosting Past 0.6bar...help

flyz33

By flyz33,
in Engines & Forced Induction

 Share

Recommended Posts

flyz33 Rising Star

flyz33

Posted
Posted

hey guys,

I have abit of an issue with my car (r34 gtr) at the moment and just wondering if you guys might be able to lend a hand and give me some ideas on what the issue could be. Installed a pair of HKS2530's that I purchased from a forumer not long ago. Put the car on the dyno for a tune last weekend and the car wouldnt boost over 0.6Bar. We took off the waste gate vacuum line to test the boost but still, it would not go over 0.6Bar.

I did a quick search on here and seems the usual troubleshoots are to check the lines and cooler piping. I went and got a 'smoke test' done on the car to see if there was a leak and where it could be coming from. There was no leak.

Im abit stumped as to what it could be...could cam timing cause this boost issue?

Cheers

Link to comment
https://www.sau.com.au/forums/topic/284746-car-not-boosting-past-06barhelp/
Share on other sites
Johnny Veteran

Johnny

Posted
Posted

Hey man, i had a similar issue with mine; on the dyno getting tuned with a newly installed evc it wouldnt boost past 0.5-0.6 bar. At first they checked vacumn lines n found nothing so we thought it was an issue with actuators or the boost controller but after careful check it turned out to be a vacumn line, not sure which one but it gave rob from creatd ms a headache for a couple of hours.

I remember vaguely somewhere under the plenum???

hope you sort it out mate, good luck!

flyz33 Rising Star

flyz33

Posted
  • Author
Posted
Hey man, i had a similar issue with mine; on the dyno getting tuned with a newly installed evc it wouldnt boost past 0.5-0.6 bar. At first they checked vacumn lines n found nothing so we thought it was an issue with actuators or the boost controller but after careful check it turned out to be a vacumn line, not sure which one but it gave rob from creatd ms a headache for a couple of hours.

I remember vaguely somewhere under the plenum???

hope you sort it out mate, good luck!

thanks for the reply man. I will probably be changing out the vacuum lines just for good measure. Hopefully that fixes things. Although, it should have boosted as we took out the wastegate vacuum line? did your mechanic try that when you had your problem?

Johnny Veteran

Johnny

Posted
Posted
thanks for the reply man. I will probably be changing out the vacuum lines just for good measure. Hopefully that fixes things. Although, it should have boosted as we took out the wastegate vacuum line? did your mechanic try that when you had your problem?

Hey man, npz i jst hope you get it sorted so you can enjoy your car.

we didnt try anything with the gates as that could be quite dangerous, found the problem beofre anything like that had to be attempted. Could it be the turbos? are they new?

maybe check to see if the installation was done right, gaskets etc or maybe its the intake rubber pipes sucking shut when it reaches 0.5bar

i dunno just throwing ideas around now cos i have no idea

goodluck bro, keep us updated

BK Grand Master

BK

Posted
Posted

I had similar problem with hks gt-ss turbos not boosting up, no matter how much I tried winding into them. Same thing with disconnecting actuator lines. Turned out to be collapsed cat converter - the more the car revved, the more backpressure was created so no extra boost. Drop the exhaust at y pipe and see what happens before you go any further. It's turned me off running cats ever again after that.

flyz33 Rising Star

flyz33

Posted
  • Author
Posted
I had similar problem with hks gt-ss turbos not boosting up, no matter how much I tried winding into them. Same thing with disconnecting actuator lines. Turned out to be collapsed cat converter - the more the car revved, the more backpressure was created so no extra boost. Drop the exhaust at y pipe and see what happens before you go any further. It's turned me off running cats ever again after that.

I have actually de-catted my cat (looks like a compliance cat), to prevent that from happening.

definately frustrating as I cant wait to wake up these turbos.

flyz33 Rising Star

flyz33

Posted
  • Author
Posted

update:

still havnt figured out what wrong with it yet.

Pulled off the cam gear cover and found that the car came with Tomei Adjustable cam gears....which brings me to my question. Can cam timing affect boost? As i suspect the timing is off.

Cheers

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

    • Duncan
      Replacing Fuel Pressure Regulator

      By Duncan · Posted

      I'm going to slap an old nismo logo sticker on my spare one and sell it to the land of the free for a thousand bucks
    • Duncan
      Replacing Fuel Pressure Regulator

      By Duncan · Posted

      lol, probably should have read further!
    • R32 TT
      33 GTR Broken front wheel knuckle

      By R32 TT · Posted

      Well - they have arrived.  And they are easy on the eye to put it mildly... These only have three bolts - but for a start there is a key that fits with vacuum like precision..  And as you can see by my ruler, the interface is large..   I listened to a podcast on HP Academy about Dan (KiwiCNC) and I'm more than comfortable he knows what he is doing. R35 Bearing assembly should arrive later today so can mock that up for a look. Can't wait to get these on and get some brake pressure logging too. IMG_3860.MP4
    • GTSBoy
      Nismo GT Pro LSD configurations

      By GTSBoy · Posted

      I would be very confident that they are the same parts (the 2 different SKUs). It seems very clear that you can drop the cam in the 2-way opening, or in the other opening. If you arrange it in the other opening in the same way that you see any other 1-way diff, ie, with the flat of the cam up against the 1° side of the opening, then it would work as a 1-way. It can only spread the ramps when driving forwards - cannot spread the ramps on overrun. It would then appear obvious that if you put the cam into the opening "backwards", that you would get the angled flats of the cam working onto the "points" of the 1° side of the opening, which would give you ramp spread in both loading directions. I do wonder if the forward direction of the 1.5-way config is equivalent to the forward direction of the 2-way, seeing as the cams are flipped and the angled surfaces on those would need to be the same on each side - AND - clearly when installed in either the 2-way or 1-1ay configuration they are not intended to work exactly the same (the ramp angles on the 2-way are 10° different between forward and backward, and the ramp doesn't exist in the 1-way config). 'twere me, I think I would rather actually have a set of rings that offered the 2-way with two different sets of ramp angles, say the 55/45 of the existing design and maybe a 45/37.5 combo for a less aggressive effect), AND another set of rings with a dedicated 1.5-way opening and a dedicated 1-way opening. The 1.5-way opening would actually have the steeper angle on the overdrive side that causes it to be less pushy than the forward drive angle, like you see in many other diffs. But really - if this Nismo thing is thought out properly and all those surfaces work on each other the way that they need to, who am I to argue?
    • GTSBoy
      Nismo GT Pro LSD configurations

      By GTSBoy · Posted

      I would be very confident that they are the same parts (the 2 different SKUs). It seems very clear that you can drop the cam in the 2-way opening, or in the other opening. If you arrange it in the other opening in the same way that you see any other 1-way diff, ie, with the flat of the cam up against the 1° side of the opening, then it would work as a 1-way. It can only spread the ramps when driving forwards - cannot spread the ramps on overrun. It would then appear obvious that if you put the cam into the opening "backwards", that you would get the angled flats of the cam working onto the "points" of the 1° side of the opening, which would give you ramp spread in both loading directions. I do wonder if the forward direction of the 1.5-way config is equivalent to the forward direction of the 2-way, seeing as the cams are flipped and the angled surfaces on those would need to be the same on each side - AND - clearly when installed in either the 2-way or 1-1ay configuration they are not intended to work exactly the same (the ramp angles on the 2-way are 10° different between forward and backward, and the ramp doesn't exist in the 1-way config). 'twere me, I think I would rather actually have a set of rings that offered the 2-way with two different sets of ramp angles, say the 55/45 of the existing design and maybe a 45/37.5 combo for a less aggressive effect), AND another set of rings with a dedicated 1.5-way opening and a dedicated 1-way opening. The 1.5-way opening would actually have the steeper angle on the overdrive side that causes it to be less pushy than the forward drive angle, like you see in many other diffs. But really - if this Nismo thing is thought out properly and all those surfaces work on each other the way that they need to, who am I to argue?
×
×
  • Create New...