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Author
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Topic: HOW DO I FIND OUT HOW MUCH PSI I AM RUNNING IN MY SUPERCHARGER
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96cobra/svt
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Member # 4240
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posted
 
 
IS A VORTEC SUPERCHARGER IN A 96 COBRA
WHEN I AM IN NEUTRAL WITH THE CAR IN IDLE WHAT SHOULD MY BOOST GAUGE BE AT?
Posts: 200 | From: NAPA | Registered: Mar 2004
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wilit
Mustang Messiah
Member # 3367
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posted
You should be pulling a vaccuum at idle. Something like -5 to -10 psi.
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"If a man hasn't found something worth dying for, he isn't fit to live." - Martin Luther King Jr.
Posts: 4793 | From: 37.78514° North 122.40100° West | Registered: Oct 2003
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98slowhoe 'FIFTYLX'
Uncle Frank
Member # 895
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posted
This is what you need to figure that out 
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AKA Franky Freaking 5 liter
Advanced Engine Development
SCT dealer
Dynotuning
Engine building
916*275*8212
88 4runner on 42's
Posts: 4206 | From: Folsom | Registered: Feb 2002
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Fostang
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Member # 3752
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posted
You should not be making any boost at idle.
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67' Fastback TT 408
67' Camaro Lsx
64' Corvette Fuelie
57' Chevy Bel Air Lsx
68’ Pony Convertible
66’ Pony Coupe
Posts: 3011 | From: Stockton/Danville | Registered: Nov 2003
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FasterDamnit
Bad Attitude
Member # 442
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posted
quote:
Originally posted by wilit:
You should be pulling a vaccuum at idle. Something like -5 to -10 psi.
Make that -5 to -10 in Hg (inches of Mercury.)
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'92 LX T5
Looked stock, went 11's 11.90 at 115mph.
'65 Mustang 347
www.fordmuscle.com
Livin' in the Carolina Pines
Posts: 2971 | From: NorCal | Registered: Sep 2001
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96cobra/svt
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Member # 4240
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posted
so if my car is reading -18 vac. my car is really out of tune
Posts: 200 | From: NAPA | Registered: Mar 2004
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2stangs69-91
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Member # 1951
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posted
no it means you don't have much of a cam(cams) in there and it pulls good vacuum. Having alot of vacuum is a good thing
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69 Mustang on hold
1991 LX hatch getting a make over
1994 F150 4X4 351
2006 Yamaha V-max 1200 Modded
Posts: 3711 | From: Redding | Registered: Oct 2002
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Blu50Stang
CAFords OG
Member # 489
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posted
At idle, you should be seeing vacuum around 17-19 in Hg.
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Ross
'88 GT - 5.0&SF 4/04 | MM&FF 8/09 | MM&FF 79-93 Mustang Performance Cover 12/12
'17 GT350R
Posts: 1916 | From: Not CA | Registered: Oct 2001
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wilit
Mustang Messiah
Member # 3367
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posted
quote:
Originally posted by FasterDamnit:
Make that -5 to -10 in Hg (inches of Mercury.)
Whoops. That's right.
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"If a man hasn't found something worth dying for, he isn't fit to live." - Martin Luther King Jr.
Posts: 4793 | From: 37.78514° North 122.40100° West | Registered: Oct 2003
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NO MANRZ
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Member # 566
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posted
Normal vacuum on 4 valves is around 23-18 inches.
You can't get boost in the driveway reving the motor because you have no load on the engine.
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Bring It . . .
Posts: 1938 | Registered: Nov 2001
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96cobra/svt
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Member # 4240
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posted
how do I find out find out how many psi I am running
size of the pulley?
Posts: 200 | From: NAPA | Registered: Mar 2004
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AJBlackGT
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Member # 3936
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posted
Did you not read the entire post or something? You need a boost gauge, and you need to go out and drive it to see how much boost you are making, there are more variables than the size of the pulley.
Posts: 1896 | From: Sacramento | Registered: Dec 2003
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