Jump to content
SAU Community

Recommended Posts

today i have just installed my boost gauge thanks to tutorial i used from here but came across a problem when i took it for a drive. The thing is it only boosts to 5 psi but i have a cat back and a pod filter so shouldnt it be at least 7 psi. Another thing, when i start the engine the needle goes to 20 ngm, is this right or should it be on 0. I have a speco gauge. any help would be much appreciated. thanks

Link to comment
https://www.sau.com.au/forums/topic/42802-boost-gauge-query/
Share on other sites

So the gauge is working perfectly fine. What about my boost pressure, i would have though it would be at 7 or 8 psi with a cat back and pod. I's also mention that havent fiddled with increasing the boost before either.

Link to comment
https://www.sau.com.au/forums/topic/42802-boost-gauge-query/#findComment-874031
Share on other sites

Nozila when you complete the exhaust you should see an increase. Mine with a full 3" ran 8 psi non-stop with no bleed valve. If you just install a bleed in the boost and set the boost to the levelo you want you will hold and hit the desired amount of boost a lot better.

Link to comment
https://www.sau.com.au/forums/topic/42802-boost-gauge-query/#findComment-874132
Share on other sites

was that my guide???

to explain yr set up. if you tapped yr hose into the intake manifold (as u should) yr gauge will read a vacuum while idling as the manifold holds a both a vacuum or boost depending on yr throttle position. now if tapped in before yr throttle body, thats a boost only source, and as such yr boost gauge would read all sorts of wonderful spacko figures as it would be reading a greater and 0 reading at all times (theoretically). This would give you a high point when idling ( as the air enters in intake pipe before the throttle body but doesnt escape through it) and a second high point when the throttle body is open and the boost is at full... what readings you'd get in between is anyones guess.

As for the boost yr getting. thats normal, remember that yr exhaust and intake will only vary your cars intake capacity, it will be easier to suck and to blow, but you havnt really changed the way the bov turb and waste gate function, so you wont see any great boost increase.

as above a 33gtst will boost to 5psi at low revs then up to 7 later... or the other way round i cant remember,

Link to comment
https://www.sau.com.au/forums/topic/42802-boost-gauge-query/#findComment-874169
Share on other sites

yes i think it was messaih, cheers mate.

boost gauge shows an idle reading of 20 ng/h. I tapped the aftermarket vaccum line in the factory one. btw can someone tell me how to get the vaccum hose from the engine bay into the dash im having problems after searching around the firewall near the peddles.

Link to comment
https://www.sau.com.au/forums/topic/42802-boost-gauge-query/#findComment-874758
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


  • 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...