NYTRORYDERAK
Veteran
Have a MPI stage 1 kit. Heres my question in the warm shop when i start it up the boost reading on the prologger is 0 or building a little boost. When I start is where i ride in the cold i see a -1 or so on the prologger for a boost number. Sled still builds boost and runs good just seeing negative numbers at idle when in cold weather or outside riding for that matter. I was wondering if anyone has experenced this also or if I should start looking for a leak in the system somewhere.
Super or Turbo??
I know on my turbo at idle it is common to see negative numbers, because it is reading the vacuum, but once you hit the throttle it goes right up.
I know on my turbo at idle it is common to see negative numbers, because it is reading the vacuum, but once you hit the throttle it goes right up.
NYTRORYDERAK
Veteran
Super i was wondering about the vacum but i thought supers were building all the time
Suoer would be zero or vary close as a turbo would be -3 or-4 at idle.
HYFLYR
TY 4 Stroke Guru
HAHA, no supers dont build boost at idle. There is still a vacuum even at slow speeds. Those are your negative numbers and yes its ok to see at slow speeds.
MRFUSION
Pro
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- 2011 Custom Built Nypex
2008 Custom Union Bay 980 MM Chassis
If you want to be proper you are pulling inches of mercury or Hg at idle. You are on the vacuum side of the throttle plates, when you dump your throttle you build big vacuum opening your blow off valve. My turbo pulls about -7 Hg at idle. 
Shad
Shad
No worries.My charger does the same
No worries.My charger does the same
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