Max 5Psi On Gauge

[jamie curran]

I have hooked up a new boost gauge (psi) but it stops at 5psi and slowly creeps to max 6psi, can anyone help me out with where i have gone wrong, ill post a pic with it.

There is a copper restricter or something in the t-piece that you can roughly see on top there, is it meant to be there?

btw i have a atomic mbc from gfb installed and running .75 on the standard gauge which is just under 11psi if my math is correct.

Edited June 4, 2011 by jamie curran

[GTScotT]

Probably a pin hole in that plastic fish tank hose your using.

[jamie curran]

Probably a pin hole in that plastic fish tank hose your using.

the hose is fine as i just put it on, i know its a common issue people have had, just need to know if ive hooked it up right

[paulr33]

whats the common issue people have had?

not being able to install boost guages properly?

that hose is ordinary as dude

seriously go and buy some real hose from autobarn/repco/bursons

its probably flexing under pressure and then leaking

there is no "common issue" of aftermarket boost guages not working

[jamie curran]

wow, i am so glad i could get on here and get some useful support from people.

@paulr33 im really sorry the words "common issue" annoys u so much but the reason i said it was a common issue is because when u look it up u get around 100 results from all different cars and gauges.

whats the common issue people have had?not being able to install boost guages properly?

I am not saying i know how to install a boost gauge properly, this is the reason i am posting on here.

[scotty nm35]

It may be crimping where it goes through the firewall, that hose isn't reinforced, and when it heats up it will just collapse like an old garden hose. Like the guys have said, you want some good reinforced rubber hose, or a solid nylon airline type hose.

[jamie curran]

ok cheers guys, im in the process on putting new hose on.

[jamie curran]

ok nylon hose is on, still the same problem, only reading 5psi. Tried change the t-piece to one without the restricter in it but no change. any ideas?

[scotty nm35]

Try another port? The brass restrictor is to help control boost pressure to the actuator.

What brand of gauge? My first cheap one was reading 3psi low.

[jamie curran]

Try another port?

can you explain that in dumb terms please

The brass restrictor is to help control boost pressure to the actuator.

so i should put the brass restrictor back on?

What brand of gauge? My first cheap one was reading 3psi low.

its a glowshift gauge, just a defi copy.

[Beer Baron]

yes the restrictor is there to limit the volume of pressured air making it to the gauge. think of a straw with 5psi through it. now think of a 4 inch pipe with 5psi through it. both have 5psi of air. think about what psi is. pounds per square inch. so 5psi through a straw may do nothing more than blow bubbles in your milkshake. through a 4 inch hose 5psi might be enough force to push open a steel door. cheap gauges have cheap insides and having a big volume of compresed air in there is not good for them. it's there to protect the gauge. it also effectively shortens the intake tract as all those little hoses need to be filled with compressed air when your engine goes onto boost. not likely you'd notice 1 length of 4mm or 6mm hose but they can add up.

[GTScotT]

Is it possible you can borrow a gauge from a mate to test it?

The best place to tee that hose is from your fuel regulator. You either currently have it hooked up to the blow off or the vacuum canister's source...

Meaning either the blow off or the vac can could be bleeding some boost and making the guage read wrong.

As stated, the most fool proof place to tee it from is your fuel regulator. Tee it there and if you do not see accurate readings try another boost gauge.

GL

[jamie curran]

ok cheers guys, ill put the restricter back on and relocate the tee and update on how it goes.

jamie