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Discussion Starter · #1 ·
I recently noticed that when I am cruising on the freeway 70+mph my vacuum gauge begins fluttering quickly about 2 to 4 psi. I tested it below 70 with overdrive off and it appears to be rpm related. Above 2,500 rpm it becomes more pronounced. It does this regardless of throttle position or load from off the throttle to mild boost under cruise situations only. My question is can this be attributed to the roots blower. I know the eaton pulsates the air and it is not a smooth transition like screw or other blowers. I have no other symptoms and the truck is running fine otherwise. This is also a new build for me and this may just be the first time I noticed it as I have not had a lot of highway miles.

Should I be concerned??
 

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Discussion Starter · #2 · (Edited)
I just double checked the vacuum port that the gauge is hooked up to and it is right below the outlet for the eaton before it goes thru the intercooler. This is also a fair distance from the bypass valve. So I am betting that my readings are a result of the buffeting air from the blower.

If anyone can confirm, deny or have any comments to add I would appreciate it.
 

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never had boost flutter at cruising....it was always in the vac side and steady
 
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