vortech not making full boost - MustangForums.com


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Old 06-03-2013, 12:43 PM   #1
jwallz23
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Default vortech not making full boost

hey guys im still new at this forum thing so maybe someone can direct me. I have a vortech v1 in my 2003 gt, theres a code on for the fuel rail pressure sensor but my fuel pressure is fine(have an external gauge. my vortech also isn't making full boost which is 8-10 lbs before and now barely goes over 5, cant find any vacuum leaks either. if im not posting in the right place just let me know. thanks
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Old 06-03-2013, 08:37 PM   #2
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hard to trouble shoot that one, are you sure you trust the pressure guage?
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Old 06-03-2013, 09:14 PM   #3
97stanger
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belt slip? Whats your setup?
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Old 06-04-2013, 07:53 AM   #4
jwallz23
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I have a low mile 03 cobra shortblock, stock gt heads n cams, hps lower intake, accufab upper plenum and 75mm tb, vortech v1 with 3.6 in pulley, 42lb injectors, svt fuel pump with KB BAP, full exhaust, drag springs, Lakewood shocks n struts, subframe connectors, driveshaft loop...I think that's it...it's for sale once I get everything back to normal. Got it all done last year an I was runnin 8lbs, changed the gauge n ran the same. Now boost barely gets to 5lbs. I kno I Gtta replace my fuel rail pressure sensor today but I don't think that's my issue as fat as boost goes. Belt slip sounds very likely, I replaced the belt and tensioner last year but I put 20k miles on it since then.
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Old 06-04-2013, 08:18 AM   #5
uberstang1
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s trim or t trim?
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Old 06-04-2013, 08:18 AM   #6
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S-trim
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Old 06-04-2013, 08:22 AM   #7
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3.6 Seems like an awfully big pulley for a s trim, I would guess it would make around 6 pounds with it.
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Old 06-04-2013, 08:36 AM   #8
jwallz23
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yup uberstang1 youre right, I went out n measured it to make sure and I goofed, its a 3.33. I was consistently makin 8-10 lbs before...higher during the winter of course
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Old 06-04-2013, 04:23 PM   #9
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If you have long tubes that would affect it as well.
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Old 06-04-2013, 11:34 PM   #10
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Pull your intake tube and check out your impeller. Make sure there is no play in the bearing and the impeller hasn't started rubbing on the volute.
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2003 mustang gt, fuel rail pressure sensor, vortech v1 supercharger

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