Boost Gauge isn't working right...
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Disabled USMC Veteran
Joined: Jan 2011
Posts: 637
Likes: 2
From: Pilot Point, TX
Boost Gauge isn't working right...
So I just finished installing my gauges (EGT, boost, and fuel press) and they all work great except boost. the lights come on the way they should, shut off the way they should, but it doesn't register any boost. I tee'd into the map line, and i've checked all the connections and can't figure out why nothing's registering... would it be a problem with the gauge internally, or is there something else going on here?
Posting Guru
Joined: Aug 2004
Posts: 2,417
Likes: 4
From: Braham MN
I assume you went out on the road and drove it, wont build boost reving in the yard.. I always take out the tiny screw that is inside the threaded nipple on the back of the boost gauge, its designed to cut down on needle chatter but all it seams to do is make the gauge slow.
Other then that only other problem is you might have kinked a line somewhere.
Diesel Rod
Other then that only other problem is you might have kinked a line somewhere.
Diesel Rod
Cargo Master
Joined: Nov 2010
Posts: 3,244
Likes: 40
Your best bet for boost is to tap into the intake neck into the manifold. This location is downstream from the turbo and will show boost the best. It is a real easy process, just remove a few bolts and the neck can be drilled and tapped on the work bench. Clean it up good before re-installing and and your done.
Outside of that and looking at your method of doing it. I would guess your boost line is kinked, your sensor blew out of the hose or pulled off the gauge, or the line is cracked.
Yeah if you are yard revving it nothing will happen. Get out on the highway about 60 and floor it. If boost doesn't register then the above is true.
Outside of that and looking at your method of doing it. I would guess your boost line is kinked, your sensor blew out of the hose or pulled off the gauge, or the line is cracked.
Yeah if you are yard revving it nothing will happen. Get out on the highway about 60 and floor it. If boost doesn't register then the above is true.
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Disabled USMC Veteran
Joined: Jan 2011
Posts: 637
Likes: 2
From: Pilot Point, TX
ok, yeah, i just revved it up in the garage, so maybe that was the problem... tomorrow morning i'll take it out for a spin and see if anything works different... i've heard that the map line way makes the gauge really jumpy... is that true or is it different with every case?
Lead Driver
Joined: Oct 2010
Posts: 5,132
Likes: 45
From: Columbus, Oh
I had this exact same problem last weekend. I ended up having a kink in the line as well as the cheap plastic T wouldn't hold pressure. I went to napa and got a NPT fitting and tied into the spyder. Now I have boost. You also must take it for a drive. Like said earlier, it won't build boost in the driveway.
Hotshot
Joined: Oct 2003
Posts: 17,799
Likes: 103
From: Ashland City, TN
ok, yeah, i just revved it up in the garage, so maybe that was the problem... tomorrow morning i'll take it out for a spin and see if anything works different... i've heard that the map line way makes the gauge really jumpy... is that true or is it different with every case?
If its a mechanical gauge, they don't read the same at idle.
You cannot really tell if its working anyways unless you get on it.
If there is a kink in the hose, it will screw everything up.
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Fleet Owner
Joined: Aug 2004
Posts: 20,419
Likes: 197
From: AZ
x2, I had one go bad. A easy way to test it is to take a small 12v air pump and put on a small attachment that will fit into the boost line. But, don't fit it in all the way, just hold it up to the line. You don't want to blow it to hard. Turn the pump on and apply a little air and see if the gauge comes up. I do this with my water injection to see if the nozzle will blow water. My water injection is turned on by boost. If I'm seeing boost on the gauge and the nozzle is not shooting out water my screen needs cleaned.
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Lead Driver
Joined: Oct 2010
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From: Columbus, Oh
Heard of plenty of guys doing that, hell even the directions say to do it that way, just didn't work for me. Oh well...
Postmaster
Joined: Jun 2009
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From: Monroe/Ellensburg, WA
Been great for two years, even with the plastic t...
FOREIGN GURU
Joined: Jul 2006
Posts: 7,655
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From: Celaya, Gto. MX
, and with the IC you loose 2-4 psi of boost. 
Thread Starter
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Disabled USMC Veteran
Joined: Jan 2011
Posts: 637
Likes: 2
From: Pilot Point, TX
well, took it out for a drive today and everything works just fine! outta curiosity, what are the normal readings everyone gets? the highest my egts went was 1k* at 80MPH, boost was 18 PSI, and fuel was about 80PSI... sound right to you guys?