boost gauge problem

[Cariboo]

I just installed an Isspro 2-50 mechanical boost gauge, plumbed with a piece of 1/4" rubber hose to the manifold test port. When the engine is under load, pulling about 16-17 psi, the gauge makes this sort of buzzing noise and the needle flutters a little. Is this a bad gauge, or does the pressure fluctuate when the waste gate starts to open, causing the gauge to wig out? It seems to work fine, it's just an irritating sound. I can always turn up the stereo if I have to.

 

[Archive]

Check your connection to the gauge... it sounds like a small leak back there.

 

[Dieselnerd]

I always get a slight needle flutter when my wastegate opens. I know it's the wastegate. Mine doesn't make any noise though.

 

[Alan Reagan]

Part of the buzzing (rattling as I call it) also comes from the #4 valve. My analog gauges did it and it disappeared when I went digital.

 

[dresslered]

Tap the intake horn for your boost connection and your flutter will go away (I'm assuming that your're using the plug on your engine currently).

 

[EMDDIESEL]

That buzzing is common when you are drawing boost readings from the Intake directly. Drill and tap the intake "Pipe" and be sure and use a stiff type of hose. The clear 1/8" tubing is the best way to go. Avoid rubber since rubber will expand under boost and pissible cause erratic readings. Just order a replacement Intake gasket (About 4 bucks) and remove the 4 bolts holding the pipe in place. Then drill and tap it, then reinstalll it and your good to go.

 

[Steve Campbell]

Installing a second small orifice in the line will quiet the guage and slow the needle.

 

[Cariboo]

I took Emddiesel's advice, and tapped the intake horn. I didn't remove it; I only disconnected the rubber hose to the intercooler, stuffed some newspaper into the intake to intercept metal chips, tapped in a hole on the elbow about an inch above the detent where the rubber connection hose ends (slathering lots of white grease onto the tap to grab stray chips), and installed a hose barb for my gauge connection. No more noise.



What a great bunch of people in the TDR willing to help each other out. Thanks for the replies.