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Posts: 7
Join Date: November 2001
Location: Las Vegas, NV
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What is the normal vacuum reading for a 5.0? -
09-30-06, 02:24 AM
I think that I may have a vaccumm leak after swaping intake/plenum combo. What is the factory vaccuum reading?
thanks,
Ron
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Official Member
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Posts: 266
Join Date: September 2006
Location: Deland, Florida
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09-30-06, 08:36 PM
Quote:
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Originally Posted by Dr Ron
I think that I may have a vaccumm leak after swaping intake/plenum combo. What is the factory vaccuum reading?
thanks,
Ron
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A lot of people seem to say that around 15 inches is normal. I tested this on my car today and I got 15-20 inches at idle.
I think if you are 13-20 you are fine, below 13 is a problem
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1989 Mustang GT, Red, 5spd
Engine: Thumper Heads, Explorer Intake, BBK 1 5/8th Headers, Mac Offroad X-pipe, Magnaflows, C&L 73MM, FMS 65MM TB, Electric Fan, 3G Alt., A/C Delete, ASP Underdrive, 155LPH Pump.
Suspension/Misc: LRS Subframes, FMS Front LCAs, FMS Quadrant/Adjuster, Pro3i LCAs, Bullitt Suspension Kit, MM Strut Tower Brace, MM C/C Plates, MM Bumpsteer Kit, SN95 5-lug with 03 Cobra Front Brakes.
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Founding Member
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Posts: 442
Join Date: September 2002
Location: Dudley, MA
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10-03-06, 08:50 AM
Depends on your cam and TB. Normal stock should be 14-16
1993 LX 5.0 T5 Notch - Twin Turbo -
(2) T04B's, (2) Tial 38mm gates, Vecco FMIC, Hallman Pro MBC, Greddy Type S BOV
Stock shortblock, E7 heads, Comp cam, GT40 intake, 42# injectors
531 RWHP, 557 RWTQ @ 16 psi
217 quarter mile runs and counting
2003 WRX (its blue obviously)
231 AWHP, 229 AWTQ @ 17 psi
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Now everyone in the world will know I wanna bang the handicapped.
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Posts: 750
Join Date: December 2004
Location: Indianapolis, Indiana
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10-03-06, 09:00 AM
Quote:
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Originally Posted by VG30DE
Depends on your cam and TB. Normal stock should be 14-16
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My car is bone stock save for a vortech blower, and full exhaust. I see 18-19 inches of vaccum at idle.
when my BOV nipple broke causing a vaccum leak I only seen 11-13... so I would say the 14-16 would be ever so no enough... but thats just me. Maybe it changes with the years 5.0 seeing how ford put slightly different cams in there througout the 5.0 run.
89 GT 5-Speed
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Founding Member
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Posts: 1,784
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Location: MI (Lansing/Howell/Farmington Hillls)
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10-03-06, 08:08 PM
13-14 is way low for a stock cam. I'd say normal is probably more along the lines of 18-20+.
I myself pull 14-15 inches of vacuum at idle with an F-cam and 1.7 rr's.
1989 lx 5.0 (notch)
TFS Track Heat heads, 1.7 rr's, f303 cam, Megasquirt ecu, twin .60/.48 turbos@8psi, Tremec 3550, 42lb injectors, 255 fuel pump, 24x12x3 intercooler, Edlebrock Performer Intake, Nitto 275 40 17's, 3.27's, AJE Tubular k-member/A-arms, maximum lowers, Ford Uppers, 99 Disc Brake Conversion
Best 1/4: 12.066 @ 123.15 489rwhp/527rwtq
http://videos.streetfire.net/video/3...ea0150d4a0.htm
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Founding Member
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Posts: 442
Join Date: September 2002
Location: Dudley, MA
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10-04-06, 12:58 PM
I pull 8-10 with my comp XE276 lol.. and thats at 1100rpm
1993 LX 5.0 T5 Notch - Twin Turbo -
(2) T04B's, (2) Tial 38mm gates, Vecco FMIC, Hallman Pro MBC, Greddy Type S BOV
Stock shortblock, E7 heads, Comp cam, GT40 intake, 42# injectors
531 RWHP, 557 RWTQ @ 16 psi
217 quarter mile runs and counting
2003 WRX (its blue obviously)
231 AWHP, 229 AWTQ @ 17 psi
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Official Member
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Posts: 150
Join Date: August 2006
Location: mission texas
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10-04-06, 03:02 PM
how do you check the vac
tf heads
gt-40 intake tubuler
e-303 cam
3.73 gears
70 thottle
80 mm air
255 fuel pump
291 rwhp & 334 torque
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Member
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Posts: 4
Join Date: July 2006
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10-04-06, 05:52 PM
check out this site---> www.my5oh.com
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Posts: 29
Join Date: August 2004
Location: Streetsboro, Ohio
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10-18-06, 05:44 PM
I am carbd but am pulling 18" vacuum at idle. It was only 15" until i adjusted the idle mixture. I am running the "B" cam and a 4180C with a 6.5 power valve, lightest secondary spring Holley has, and the primary is jetted two sizes up and the secondary metering plate is drilled two sizes up.
George
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