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Old 09-20-2003, 04:33 PM   #1
SleeperGT
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Default Boost Gauge Questions

I just had the AutoMeter Lunar gauge cluster installed, along with a boost and fuel pressure pillar gauges. Question I have concerns the Boost gauge. What exactly does the vacuum side of the gauge mean? When I'm just motoring around town under moderate throttle, it ranges from 10 to 5 or so. When I hammer it in 1st or second gear I might see 0, maybe 1 or 2 on the Pressure. It seems I really only get into the Pressure side of the gauge when I really hammer it in 3rd gear and I'm really at high speed I'm registering up to 8 psi at this point, which is what I expected. And it is a very gradual build up to the 8 pounds. Can someone explain the progression from the VAC side of the gauge through to the Pressure side of gauge? Thanks!
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Old 09-30-2003, 09:05 AM   #2
jonnyk
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Vacuum is when your throttle blade is mostly closed, the outside air can't get in and the engine is still spinning, trying to suck it in, so it forms a vacuum. Once you stomp on the gas the throttle blade opens, air rushes in and fills the vacuum, and your manifold will be close to ambient air pressure (the 0 marker). Once the blower starts to work, up goes the boost.
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Old 09-30-2003, 10:12 AM   #3
BilLster
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this is normal with a vortech style blower they dont make boost till high Rpm .

Vacum is the motor trying to suck air in boost is the blower forcing air in.

jonnyk explained it better than i could.
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Old 10-01-2003, 12:39 PM   #4
SleeperGT
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Thanks guys! Very helpful.
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'00 GT
5-spd
Vortech S-Trim
3.1" Pulley
Paxton Air-to-Air Aftercooler
90 mm MAS
42 lb injectors
Cobra Fuel Pump
70 mm AccuFab Throttlebody
C & L Intake Plenum
2 1/2" X-pipes
Anderson PowerPipe
MagnaFlow Mufflers
Diablo Custom Chip
3.73's
Steeda Lower Control Arms
358 rwhp (Mustang Dyno)

New Track Times Coming Soon
SleeperGT is offline   Reply With Quote
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