what is your idle vacuum reading - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 12 Old 07-26-2012, 10:23 PM Thread Starter
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what is your idle vacuum reading

just trying to get an idea of compression and efficiency of this engine. Whats everyone showing in vac at idle. Assuming your between 800 -1000 rpms.

first turbo car, up on jacks still and not moving. cant wait to put real load and see what she does. hard to spool it standing still.


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post #2 of 12 Old 07-26-2012, 10:37 PM
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I think mine is 15 vac at idle. Stock long lock with ecam


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post #3 of 12 Old 07-27-2012, 01:07 AM
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somewhere around 15. also an e-cam

12.7s motor, 11.7s spray, turbo 400/460. [email protected]
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post #4 of 12 Old 07-27-2012, 06:28 AM
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My notch idled in drive @ 825-850 RPM with 12-14in . The combo was an f303, TFS Track Heat Heads, Eddy performer intake and 1.7rr's.

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Last edited by millhouse; 07-27-2012 at 02:49 PM.
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post #5 of 12 Old 07-27-2012, 09:10 AM
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Mine is around 15-16 at idle...stock block and cam...TF-TW 170 heads,TF street heat intake...

Turbo installed!!!!
87 GT Vert.On3 turbo making 14 psi,Trickflow TW 170cc heads,TF street heat intake,70mm TB,stock cam,1.6 roller rockers,Snow performance stage 2 meth kit,42# injectors,340 lph fuel pump,AOD,Lentech VB,electric OD 3000 stall.3.55's
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post #6 of 12 Old 07-27-2012, 01:02 PM
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mine is always 13-14 with a custom freezy cam...

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post #7 of 12 Old 07-27-2012, 02:34 PM
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9-10 inches. F303, TFS heads, Victor EFI intake, stock shortblock. Last leak-down test showed 5-7% in all cylinders.

1989 5.0 T5 LX Hatch - Explorer Short Block with an FMS F-303 cam, TFS TW170 heads, Tmoss Ported Cobra Intake, an On3 Turbo Kit with a 67mm Ceramic Ball Bearing Turbo, and backed by a T56 Magnum 6spd with 3.55's
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post #8 of 12 Old 07-28-2012, 01:07 PM
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18 in/hg idle at 750 rpms, comp stage 2 cam.

07 Grabber Orange GT Prem/Vert/6060/3.55
S&H Twin turbo kit, 6262 oil-less Comp turbos
9:1 compression 281, turbo cams, e85
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post #9 of 12 Old 07-28-2012, 07:25 PM
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4.6 4 valve stock 98 cams 20-21, 900 rpm.

It will vary with cams.

I only use vacuum to tell if something is "wrong" if normally the car runs at 20 and all of a sudden its around 14 then something is wrong.
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post #10 of 12 Old 07-29-2012, 12:20 AM
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12 in. when it's cold and 14-15 when it's warm. tfs stage 1 cam.


I'm not a magazine racer, my car is actually fast.
I also have a Honda civic but, mine has a bigger, uglier driver.
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post #11 of 12 Old 08-01-2012, 12:39 AM
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12ish with an FTI Cam

89 Coupe: 362CI, 227cc HP Heads, Super Vic EFI, 80mm Turbo, C4, and MS2 Extra
9.89 @ 142mph on 16psi
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post #12 of 12 Old 08-01-2012, 10:09 AM
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20, stock heads and cam
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