Jump to content
SAU Community

Recommended Posts

okok i have a weird problem that's being going on since i got the car. From memory, the boost on a gts-t is two step, 5psi at 4500 and 7psi til 7000rpm. Now why is that the boost on my boost meter never reaches 0.5? I have a blitz electronic boost gauge connected so it should read an accurate reading.

Any suggestions?

Edited by teng
Link to comment
https://www.sau.com.au/forums/topic/225847-boost-question-on-r33-gts25t/
Share on other sites

Ok the initial post was crap. Wrote that while i just woke up. lol

The question is, looking at the boost meter, a stock gts-t should be able to reach 5bar with no problems right?

If it's only stuck at 4bar all the time no matter if you rev til redline, what could be the problem?

I checked all my lines and they are intact with no leaks. Could the actuator f**k the boost?

Edited by teng

4 bars? that means your running 58psi.

do you mean 0.4 bars = 5.8psi....what does your stock one read?

maybe unplug your soleniod and take it for a spin. if it feels the same then it might be your solenoid. if its slower then it may be your boost guage thats not reading right. just a suggestion.

ok took it for a spin just now without the solenoid connected and ran 0.4bar all the way til 6000rpm. It was the same with the solenoid connected, also 0.4bar. Guess solenoid is ok. If it was f**ked up, it sould only show 0.3bar.

Edited by teng

the question now is did the car feel the same before and after or is the guage just reading the same before and after? if it felt the same then it might be a boost/solenoid thing but if it felt slower dis-connected then its probably the guage. does your stock guage say different.

is the guage new? i dont know the diff in connection between an electronic one and a mechanical one. you might want to check if the hoses for the guage arent pinched or leaking anywhere.

All hoses are new HKS silicon ones. The stock gauge reads the same as the electronic blizt one which i connected myself. The car felt the same with or without the boost solenoid connected. lol

Boost is strong at 0.4 bar though. Felt like an airplane taking off.

Electronic boost gauge has an additional sensor to connect the vac hose from the fuel pressure regulator hence i don't have to run the hose very long while else the mechanical boost gauge needs a very long hose from the fuel pressure regulator to the gauge iteslf. That's the only difference. According to shops, the electronic gauge is more accurate than the mechanical ones cause of the additional sensor included in the package.

post-48477-1214715900_thumb.jpg

post-48477-1214715988_thumb.jpg

Edited by teng

interesting....all i know when i had mine if its d/c then it runs 5psi and the feeling is noticable. I have done the earthing mod and can tell the difference from 5psi to 7psi whilst driving and switching it on and off via a switch in cabin.

I also wired the solenoid up to a water spray kit so when it turns on after 4500rpm it automatically sprays. so i assumed its on and controling boost rather than working only when the car overboosts.

now im doubting myself...ha. maybe someone else can shed some light.

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

    • Hi guys, has anyone either purchased or built themselves a rotisserie for their car before? I can only just justify the need for one hence why I should just make one but at the same time, if I make one I can kiss another 4 weeks of potentially productive car working time goodbye because I'm building a bloody rotisserie....  I mainly want it for the application of the body deadener.  Cleaning the old stuff off, priming and then colour over the deadener doesn't worry me, it's just the application using the Schutz Gun that I feel would achieve a significantly better finish painting it side on and keeping the Schutz Gun upright.  I don't think they would work well on the side let alone almost upside down for some areas.  If the product I use (Terosun, etc) could work through a HVLP ok then it might be ok to apply without the rotisserie.   I can get one of these style ones for about $1200 which is pretty good value-     I reckon if I made one it would cost around $500 but it's more the time that it would take is more of a killer than the cost.  They look to hold their value pretty well second hand so I could always sell it after using it and realistically only lose $200-$300 at worst.  Or keep it and buy another project when this one finally sees the light of day... Anyone selling one...? Cheers!  
    • While it is a very nice idea to put card style AFMs into the charge pipe (post intercooler, obviously), the position of the AFM and the recirc valve relative to each other starts to become something that you really have to consider. The situation: The stock AFM is located upstream the turbo, and the recirc valve return is located between the AFM and the turbo inlet, aimed at the turbo inlet, so that it flows away from and not through the AFM. Thus, once metered air is not metered again, neither flowing forwards, or backwards, when vented out of the charge pipe. When you put the AFM between the turbo outlet and the TB, there is a volume of pressurised charge pipe upstream of the AFM and there is a volume of pressurised pipe downstream of the AFM. When the recirc valve opens and vents the charge pipe, air is going to flow from both ends of the charge pipe towards the recirc valve. If the recirc valve is in the stock location, then the section between it and the TB doesn't really matter here - you're not going to try to put the AFM in that piece of pipe. But the AFM will likely be somewhere between the intercooler and the recirc valve, So the entire charge pipe volume from that position (upstream of the AFM, back through the intercooler, to the turbo outlet) is going to flow through the AFM, get registered as combustion air, cause the ECU to fuel for it, but get dumped out of the recirc valve and you will end up with a typical BOV related rich spike. So ideally you want to put the AFM as close to the TB as possible (so, just upstream of the crossover pipe, assuming that the stock crossover is still in use, or, just before the TB if an FFP is being used) and locate the recirc valve at the turbo outlet. Recirc valve at the turbo outlet is the new normal for things like EFRs anyway. In the even of a recirc valve opening dumping all the air in the charge pipe, pretty much all of it is going to go backwards, from the TB to the recirc valve near the turbo outlet. But only a small portion of it (that between the TB and the AFM) will pass through the AFM, and it will pass through going backwards. The card style AFMs are somewhat more immune to reading flow that passes through them in reverse than older AFMs are, so you should absolutely minimise the rich pulse behaviour associated with the unavoidable outcome of having both a recirc valve and an AFM in the charge pipe.
    • Yep, in my case as soon as I started hearing weird noises I backed off the tension until it sounded normal again. Delicate balance between enough tension to avoid that cold start slip and too much damaging things.
    • I'm almost at a point where I feel like changing the alternator. Need to check the stuff you mentioned first though.
×
×
  • Create New...