Jump to content
SAU Community

Recommended Posts

Evening fellow car lovers...

My car - R33 GTST

Recently i did the following modifications... upgraded to R34 GTT intercooler, installed Turbo Smart Dual Stage Boost Controller (switch mounted in cabin to switch between a high and low boost setting) and a Drift Boost Guage. Installed everything myself...

Now... with the boost controller at its minimal settings (as low as the dials can go), im getting 2 different boost readings between the factory guage and the aftermarket one. I installed the aftermarket one onto the thicker hose commin off the intake manifold goin to the fuel pressure regulator (so the guages are taking readins of opposite sides of the intake manifold).

Stock guage is telling me about 8-9 psi... aftermarket guage is telling me 0.75 bar... thats like near 11psi??

Why/Which is correct??? :down: lol in oversight whats the point of having a dual stage boost controller if at its low boost setting its already at the limit of the factory turbo :D (i wasnt planin on upgradin the turbo)

Any input would be greatly appreciated :)

Link to comment
https://www.sau.com.au/forums/topic/199271-different-boost-readings/
Share on other sites

Firstly, a gauge is only as good as the manufacturer. It's not beyond the realms of possibility for 2 different gauges to give 2 different readings of the same thing. The Nissan factory gauges are notoriously inaccurate, though.

And a boost controller cannot lower the boost below standard. It can only raise boost above standard.

Firstly, a gauge is only as good as the manufacturer. It's not beyond the realms of possibility for 2 different gauges to give 2 different readings of the same thing. The Nissan factory gauges are notoriously inaccurate, though.

And a boost controller cannot lower the boost below standard. It can only raise boost above standard.

Like the man says, if you are concerned get your aftermarket boost gauge calibrated.

Cheers GW

The aftermarket boost controller, should be able to get boost BELOW 7PSi, if installed correctly.

The factory actuator is only a 3PSi setup.

The question is, did you remove the factory solenoid?

Also, have you removed the ball and spring from the Turbo Smart tee-piece?

Those boost controllers aren't that great... I ran one, switched for the little $20 boost controller and haven't looked back!

The aftermarket boost controller, should be able to get boost BELOW 7PSi, if installed correctly.

The factory actuator is only a 3PSi setup.

The question is, did you remove the factory solenoid?

Also, have you removed the ball and spring from the Turbo Smart tee-piece?

Those boost controllers aren't that great... I ran one, switched for the little $20 boost controller and haven't looked back!

Uhhh no Im pretty sure the stock R33 GTST actuator is set at 7psi...

Have you ever actually seen a 33 hold 3psi on a stock turbo with everything functioning correctly?

I did remove the factory boost solenoid... and what spring inside tpeice???? lol i just hooked the tpeice between the turbo nd wastegate like the instructions said and blocked off the other top hose which went to the factory boost solenoid... nd yeah at its minimal settings its at like .75 bar lol

What sort of things would i need to check to see if anythin went wrong in installation?? Im pretty sure i did everything correctly though cause it all works lol

Uhhh no Im pretty sure the stock R33 GTST actuator is set at 7psi...

Have you ever actually seen a 33 hold 3psi on a stock turbo with everything functioning correctly?

Yeah the stock actuator is two stage. 5psi to 5000rpm then 7psi to redline :thumbsup:

I take it that your Drift boost gauge just a cheap knock off, in which case its properly as useless as the stock one. Go out and get a proper brand gauge, personally i wouldnt use any thing less than autometer (not autogague) so that means around the 100-150mark depending where you get it from, if you want to spend more on apexi and the like thats all good, you'll probably get an even more accurate reading but in your case an autometer should serve you well.

If you have the basic breathing mods done, ie fmic, turboback exhaust and filter than on low boost with no solinod you should be around the 6-7psi mark.

The location on the manifold where you get your vacuum/boost reading doesnt matter as long as its definately a manifold feed.

LOL, where do you go about getting boost guages caliibrated?

Nearly missed this, first off gauge needs to be cabable of being opened without terminal damage being inflicted. (best option) if not can get correction chart? The yellow pages is always a good place to start, mechanical gauge range = press - 0 - vacuum, electrical = take sensor also. Any NATA instro calibration company or connections to airforce/airlines/altimeter calibration joints, know anyone in the sky-diving game.......breathing? :thumbsup:

Cheers GW

Heya, i dont think the drift guage is faulty, it sells for 90 bux... nd is pretty lol...

I havent done air intake or exhaust mods yet... pod filter is on its way from ebay :banana: nd exhuast wont be for a while. Ahwell i dont really need the turbo to boost more than it is at the moment anyway lol, after i get the exhaust and a safc ill get tuned on a dyno and they can look at it then :down:

thanx for input guys

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

    • Have a look at that (shitty) pic I posted. You can see AN -4 braided line coming to a -4 to 1/8 BSPT adapter, into a 1/8 BSPT T piece. The Haltech pressure sender is screwed into the long arm of the sender and factory sender (pre your pic) into the T side. You can also see the cable tie holding the whole contraption in place. Is it better than mounting the sender direct to your engine fitting......yes because it removes that vibration as the engine revs out 50 times every lap and that factory sender is pretty big. Is it necessary for you......well I've got no idea, I just don't like something important failing twice so over-engineer it to the moon!
    • Yup. You can get creative and make a sort of "bracket" with cable ties. Put 2 around the sender with a third passing underneath them strapped down against the sender. Then that third one is able to be passed through some hole at right angles to the orientation of the sender. Or some variation on the theme. Yes.... ummm, with caveats? I mean, the sender is BSP and you would likely have AN stuff on the hose, so yes, there would be the adapter you mention. But the block end will either be 1/8 NPT if that thread is still OK in there, or you can drill and tap it out to 1/4 BSP or NPT and use appropriate adapter there. As it stands, your mention of 1/8 BSPT male seems... wrong for the 1/8 NPT female it has to go into. The hose will be better, because even with the bush, the mass of the sender will be "hanging" off a hard threaded connection and will add some stress/strain to that. It might fail in the future. The hose eliminates almost all such risk - but adds in several more threaded connections to leak from! It really should be tapered, but it looks very long in that photo with no taper visible. If you have it in hand you should be able to see if it tapered or not. There technically is no possibility of a mechanical seal with a parallel male in a parallel female, so it is hard to believe that it is parallel male, but weirder things have happened. Maybe it's meant to seat on some surface when screwed in on the original installation? Anyway, at that thread size, parallel in parallel, with tape and goop, will seal just fine.
    • How do you propose I cable tie this: To something securely? Is it really just a case of finding a couple of holes and ziptying it there so it never goes flying or starts dangling around, more or less? Then run a 1/8 BSP Female to [hose adapter of choice?/AN?] and then the opposing fitting at the bush-into-oil-block end? being the hose-into-realistically likely a 1/8 BSPT male) Is this going to provide any real benefit over using a stainless/steel 1/4 to 1/8 BSPT reducing bush? I am making the assumption the OEM sender is BSPT not BSPP/BSP
    • I fashioned a ramp out of a couple of pieces of 140x35 lumber, to get the bumper up slightly, and then one of these is what I use
    • I wouldn't worry about dissimilar metal corrosion, should you just buy/make a steel replacement. There will be thread tape and sealant compound between the metals. The few little spots where they touch each other will be deep inside the joint, unable to get wet. And the alloy block is much much larger than a small steel fitting, so there is plenty of "sacrificial" capacity there. Any bush you put in there will be dissimilar anyway. Either steel or brass. Maybe stainless. All of them are different to the other parts in the chain. But what I said above still applies.
×
×
  • Create New...