Jump to content
SAU Community

Boost Problem

_MRR33

By _MRR33,
in Engines & Forced Induction

 Share

Recommended Posts

_MRR33 Experienced

_MRR33

Posted
Posted

Hey there,

I've just noticed this today, as I don't really boost my car often but after I took it for a run to make sure it was running well after I was working on the motor I noticed that the car is only boosting to about 2-3PSI?

It had a boost control on it, which was turned right down because I just had a forged rebuild so I took off the boost control and connected it normally, still seems like it's only boosting at 2-3PSI on the stock boost guage as well as a aftermarket boost guage.

Any ideas? All hoses etc seem to be connected well checked everything I could...

Link to comment
https://www.sau.com.au/forums/topic/144683-boost-problem/
Share on other sites
  • 2 weeks later...
_MRR33 Experienced

_MRR33

Posted
  • Author
Posted
when you say 2-3,do you mean 2-3 on the stock gauge?

because that is normal...

Yeah, I do mean on the stock guage. My other guage ain't that great so I can't go off that either.

I'll go over the car this weekend T04GTR make sure all that is alright.

But, Waz - so it's normal only to go to 2-3PSI on the stock guage then? So, It's just me? :(

Link to comment
https://www.sau.com.au/forums/topic/144683-boost-problem/#findComment-2728776
Share on other sites
RANDY Veteran

RANDY

Posted
Posted

Stock boost under 4500rpm is 5psi and 7psi over that.

So 7 on the guage is 7000mmHg or whatever the multiple is, which is about 1 bar I think? So you should see about halfway between 0 and 7 when on full boost.

Link to comment
https://www.sau.com.au/forums/topic/144683-boost-problem/#findComment-2728893
Share on other sites
WazR32GTSt Grand Master

WazR32GTSt

Posted
Posted

stock gauge is in mmHg (that millimetres of mercury)

and the conversions are: 760mmHg = 1bar = 1atmosphere = 14.3(ish) psi

and the stock gauge is read at x100mmHg

so...

+7 on the stock gauge actually means 700mmHg which is a tad under 14psi

and so on a stock R33, which runs 5psi then 7psi higher in the rev range, you would expect the stock gauge to read between +2 and +4 on the stock gauge

that is 100% normal :D

from my experience, the stock gague is pretty accurate. its flaws are that is it hard to read because of its units aren't commonly talked about, its in a hard position to see, and that it can't read over 14psi

Link to comment
https://www.sau.com.au/forums/topic/144683-boost-problem/#findComment-2731327
Share on other sites

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

    • sinn3r
      R34 Skyline climate control unit transistor

      By sinn3r · Posted

      You can’t see much on the other side as the lcd is there I don’t think it’s the same as the m33 beside it as the markings on top is not the same was hoping someone had a good quality photo or if they just happened to have the unit in hand, quickly take the cover off and take a photo to clearly show the marking on top to identify the diode   the unit is currently with an electronics repair shop so I can’t take another photo at the moment hopefully they are smart enough to know if it’s a zener diode or not
    • soviet_merlin
      WGNC34 - floor mats

      By soviet_merlin · Posted

      I'd be very surprised if you can buy new OEM mats. But if you can, I want some too!  Do you have links to the variations you found? Also, where are you located? I found that Nengun is happy to list items to purchase but when you do buy them you'll get an email that it's actually discontinued. As far as I know the variations in floor mats are different colour schemes as well as automatic and manual having a slightly different shape. The automatic ones fit into a manual car without issues, but I think you'd have trouble fitting the other way around. I have photos that show the shape difference if you care. FWIW I bought sets of used floor mats in decent condition at yahoo auctions.
    • Marek
      WGNC34 - floor mats

      By Marek · Posted

      Hi 🙋‍♂️. Just bought my Unicorn but the interior need some minor work so it would match my expectations ;). I noticed it is hard to get used oem floor mats in good condition so i started to dig if there's any chance to buy set of new ones. I found two websites - nengun and amayama and it looks like one can still buy factory new floor mats in Japan, but thers a small issue. Some mats (i assume genuine, oem ones) are marked as G4900 and these are "discontinued". The ones you can buy are marked as G4911 but i have no idea if these are also oem, made by other producer or some lower quality replacements that looks entirely different. Can anyone help? 😃  P.s. there is also some strange indication - 0V005, 0V015 and 0V505. Any idea what does it mean? Would appreciate any help with this 🙏
    • Marek
      Hi everyone.

      By Marek · Posted

      Hi, Marek here 🙋‍♂️. I finally fulfilled my longtime dream - recently bought Stagea and now waiting for it to arrive in Poland. There's only few of these in my country, and one of the owners  recommended mi this forum as a source of all the info i'd need since now i own one  so here i am.  
    • The Bogan
      NC MX5

      By The Bogan · Posted

      Version 1 aluminium airbox is.......not acceptable No pics as I "didn't like the look.....alot" Even after all my "CAD", and measurements, the leg near the fusebox just didn't sit right as it ended up about 10mm long and made the angle of the dangle look wrong, the height was a little short as well, meh, I wasn't that confident that Version 1 was going to be an instant winner I might give Version 2 another go, there's plenty of aluminium at work, but, after having in on and off a few times, and laying in the old OEM airbox without the new pod filter and MAF, there may be an option to modify the OEM air box and still use the Autoexe front cover and filter.... maybe This >  Needs to fit in here, but using the panel, and not the pod, the MAF will need to fit in the airbox though> I'm thinking as the old OEM box and Autoexe cover that is sitting in the shed is just sitting around doing nothing, and they are relatively abundant and cheap to replace if I mess it up and need another, it may well fit with some modifications to how the Autoexe brackets mounts to the rad support, and some dremiling to move it get in there, should give me some more room for activities, as I don't want to move the MAF and affect the tune Sealing the hole it requires to stick it in the air box is simple, a tight fit and some pinch weld will seal it up tight  I am calling this a later problem though
×
×
  • Create New...