Jump to content
SAU Community

Recommended Posts

Hi Guys,

I'm worried my stock boost valve is boosting too low on my 33. It is completely stock besides 3 inch cat back and a pod filter. Watching the stock boost gauge, it only seems to boost to the middle +ve mark (i would assume 3.5 psi) up to 4500 revs and then to about half way up towards the 7 on the gauge (5.5psi perhaps?). This is probably a bit unclear and difficult to explain, but it looks like it is only boosting to 5.5 psi max. Do you guys think this is a fault in the gauge, or the stock boost valve? Or is this normal?

Any help would be extremely appreciated, i don't know whether to be worried or not...

Thanks in advance :rant:

Hi Jeremy,

I can think of three things

1. Yes your boost gauge could be faulty

2. The wastegate spring tension could be worn hence unable to get to the max 7 psi.

3. The turbo could be worn. Maybe the impellars/blades are worn.

My 2c worth

If you're talking about halfway between 0 and +7 on the stock boost gauge, then it is perfectly normal. The scale on stock boost gauge is NOT in psi but in x100mm Hg (mercury)

(1 Bar = 750 mm Hg)

Therefore +7 (maximum value) = 7x100 = 700mm Hg = +/-0.9 Bar = +/- 14 psi.

Stock R33 should boost to a little below the middle mark between 0 & +7 (around 5 psi) up to 4500rpm then around the middle mark (7psi) above that - as said by paulr33.

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

    • Welcome to Skyline ownership. Yes, it is entirely possible parts websites get things wrong. There's a whole world of inaccuracies out there when it comes to R34 stuff (and probably 33 and 32). Lots of things that are 'just bolt on, entirely interchangable' aren't. Even between S1 and S2 R34's. Yes they have a GTT item supposedly being 296mm. This is incorrect. I would call whoever you got them from and return them and let them know the GTT actually uses 310mm rotors. Depending on where you got them from your experience and success will obviously vary.
    • Hi...a bit a "development" on the brakes. I spoke to the guys where i get brakes from...and they are saying that 296mm EBC are for R34 GT-T. I then went to their site: https://www.ebcbrakes.com/vehicle/uk-row/NISSAN/Skyline (R34)/ and search for my car(R34 GT 1998 - it has GTT brakes) and it show me this USR1229 number and they are rly 296mm rotors... So now iam rly confused... The rotors i have now on the car are 310mm asi shown... So where is the problem? Does the whole EBC got it wrong or my calipers are just...idk know what?  
    • Oh What the hell, I used to get a "are you sure you want to reply, this thread is XX months old" message. Maybe a software update remove that. My bad.
    • This is a recipe for disaster* Note: Disaster is relative. The thing that often gets lost in threads like this is what is considered acceptable poke and compromise between what one person considers 'good' looks and what someone else does. The quoted specs would sit absurdly outside the guards with the spacers mentioned and need  REALLY thin tyres and a LOT of camber AND rolling the guards to fit. Some people love this. Some people consider this a ruined car. One thing is for certain though, rolling the guards is pretty much mandatory for any 'good' fitment (of either variety). It is often the difference between any fitment remotely close to the guards. "Not to mention the rears were like a mm from hitting the coilovers." I have a question though - This spec is VERY close to what I was planning to buy relative to the inboard suspension - I have an offset measuring tool on the way to confirm it. When you say "like a mm" do you mean literally 1mm? Or 2mm? Cause that's enough clearance for me in the rear :p I actually found the more limiting factor ISNT the coilover but the actual suspension arms. Did you take a look at how close those were?
    • @GTSBoy yeah sorry i know thery are known for colors bud those DBA are too in colors 🙂 Green will be good enough for me  
×
×
  • Create New...