Jump to content
SAU Community

Noob Boost & Boost Gauge Help

Mayuri Krab
 Share

Recommended Posts

Mayuri Krab Grand Master

Mayuri Krab

Posted
Posted (edited)

Hey all, sorry if this is a noob/stupid question, but I want to know wether my car is boosting as it should be.

I have a dead stock auto R33 GTS-T (only mod is CAT, & a random "turbo" sticker :thumbsup: )

Heres what I learnt from searching the fourms so far:

-The stock boost gauge (R33) reads in 100 mmHgs, so 760mmHg = 1bar = 14.7psi.

-Stock boost for stock R33 should be 5psi (~260mmHg) upto 4500rpm then 7psi (~360mmHg) thereafter till redline.

-stock boost gauge from the R33 is not very accurate, but it should atleast be accurate enough for use as an rough indication right?

What I want to know is, on stock does the car only boost when you drive it properly (ie the way its meant to be driven,ie ie atleast 1/3 floor it)? Coz most of the time, I drive "normally" like my parents (ie grandma style), the boost needle never seem to go above 0, infact its mostly in the -ve region. Which means its not boosting right?

Only time I saw it going into the +ve region (only slightly, which I think is about 260mmhg ~5psi) is this one time on the free way I was overtaking a series of "even grannyer" drivers (some BMWs doing something like 65km/h on the free way :D ).

So basically is this normal, or do I have problems with my turbo or something? Sorry about the "noobness" of the question.

I know my way around the current generation of comptuers but don't know sh*t when it comes to cars.

Thanks all.

Edited by Mayuri Krab
Link to comment
https://www.sau.com.au/forums/topic/209956-noob-boost-boost-gauge-help/
Share on other sites
White GTS-T Mentor

White GTS-T

Posted
Posted

From what you are saying, i would say your car is fine. Positive pressure is usually dependent of throttle percentage and how it is applied.

For example, if you ease onto the throttle in second from 1500rpm at 5% throttle to 3500rpm at 15% throttle you can stay in vacuum the entire time. But if you were to go from 1500rpm at 5% throttle to 3500rpm with say 50% throttle you would be making positive pressure (boost).

It's very dependent of the way you drive, hope that helps.

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

    • sunsetR33
      ugently need expert / experienced opinion

      By sunsetR33 · Posted

      I'm hoping I just don't have to do an engine rebuild NOW. Doesn't mean I won't do it at some point. I think a plus point is that the car presumably ran on or close to stock power nearly all it's life so far. Only the Owner I bought it from actually increased power with a standalone ECU and blew the OEM turbos. And after it got thee 2860s it wasn't driven an awful lot either.   That is what I meant. With the twins coming on so late (4500-5000rpm) I hope the rods won't want to exit the block prematurely. And it still being a 26 means the torque curve isn't gonna hike up all that much.   It didn't blow up on the dyno when they tuned it to 500ish crank. So I suppose it'll be okay for now. They did put a Tomei head gasket on first though which did not seal at all, and they redid it with a Cometic one. Which I hope won't be my water leak.   Mainly anything oil. So far all it has is the N1 pump, oil restrictor and a filter relocation kit with a cooler.
    • GTSBoy
      Comfortable replacement seats for R32 GTR

      By GTSBoy · Posted

      15000? ish? Something like that anyway. It wasn;t so much a wear as a tear that then spread. Might have lasted a lot longer if not bothered by just one incident, whatever it was. I took a punt. They are really comfortable and do a good job of holding. My daughter HATED it when I first put them in, and probably still does now. She has sensory issues and hates the way they are all up your business. I'm 197cm and 95kg. Not fat or particularly wide, and the XL size seat is the rigth fit. If I was any fatter it would start to get too snug. Any skinnier and you'd possibly want the smaller width.
    • r32-25t
      Comfortable replacement seats for R32 GTR

      By r32-25t · Posted

      Mrs rs focus came factory with recaro cs  sportsters in it and they a pain in the ass to get in and out of with the really high bolsters, once you were in them they were one of the most comfortable seats I have ever sat in
    • GTSBoy
      Shifting questions

      By GTSBoy · Posted

      The NA 2.5 has very little torque. You won't feel much. Those trannies are also a million years old now and it could well be f**ked. First generation electronically controlled autos will often refuse to kick down, ete, etc, depending on what's wrong with them.
    • GTSBoy
      ugently need expert / experienced opinion

      By GTSBoy · Posted

      Yes, but no but yes but no. Those "it's fine up to 500HP" rules and everything else like it were all determined back when the cars were 10 years old. As they are now 30 years old.....what do you reckon the chances of something shitting the bed are? I'd say they are much higher now than they used to be. You might be lucky. You might be unlucky. Spin the wheel and find out. Yeah, nah. It's actually exactly the opposite. Making boost early and having heaps of torque able to be generated right in the middle of the rev range will do more to damage an engine than having to rev it high to make the power. Think about the load on the conrods, bearings, etc, to make 400HP at 4000 rpm, vs 400 HP at 6500 rpm. So someone has already "let the Nissan out" which is how we describe the increased chance of a fiddled with engine to have had something done wrongly. Many more engines that have been opened die than stock ones do - even if you into consideration how they are treated wrt power levels and the like. Again, not saying that yours will definitely have been put back together by a moron. But the possibility does exist. It's still a lottery. Spin the wheel. What weakspots?
×
×
  • Create New...