Boost gauge flutter

[Redneck47441]

I installed autometer phantom II's. When I had the factory straight piped exhaust on my truck the boost gauge would go up to 27 lbs. and hold steady when I floored it. Now I've installed 4" tb exhaust straight piped and when I floor it goes up to like 30lbs and the needle flutters doesnt stay still its a 60lb gauge.

[Rodslinger]

Do you have it tapped into the MAP line?

[Ditty]

I'm assuming your running a stock turbo. I'm thinking that is Compressor Surge. Also, the stock turbo isn't very efficient at boost pressures over 25-27psi.

[Evil Eye]

x2 on suspecting tapped into MAP line. Mine did that too until I tied it into the intake...

[06TWO50Diesel]

MAP line will give you the flutters. I'm coming right off the intake. The autometer is about 2 seconds behind the stock gauge on reading speed, but they read the same thing and there is no flutter and haven't had a problem yet.

[Ditty]

Mine is in the MAP line and I have never had any flutter...save for surge.

Edit:
YOU KNOW WHAT? I JUST REALISED THIS IS ON A 6.0L. COLOR ME STUPID!!!! LOL

[Rodslinger]

I actually contacted ISSPRO a few years ago when I first installed mine and they were aware of the flutter problem but the only fix they said was to move it from the MAP like Shawn & Nate mentioned.

[Echo]

Congrats Ditty. Oh and what color is stupid by the way?

[Redneck47441]

I put it into the intake elbow as suggested by diesel manor. Is it possible its the wastegate opening up.

[Echo]

6.0's dont have a wastegate.