Supercharger Is Loosing Boost!

jerb43 · October 5th, 2006, 11:19 AM

I bought a 1998 mustang GT with a vortech supecharger. I was getting 6lbs of boost, at 3000 rpm, and 10 lbs at 5000 rpm. But now I'm getting 0-1 lbs, and 4-5 lbs! could the supercharger be going out in it? someone help me please!!

mdvaldosta · October 5th, 2006, 11:36 AM

You probably have a slipping belt, look for black dust around the pulleys. A new belt should fix it, Gatorback is preferred, the cheap stuff slips.

itschristorres8 · October 5th, 2006, 01:22 PM

do most s/c get fulll boost that late in the RPM band?

mdvaldosta · October 5th, 2006, 02:02 PM

Centrifugals do.

jerb43 · October 5th, 2006, 04:19 PM

yeah, my supercharger used to get 10 lbs of boost at 5000 rpm, but for some reason its only getting 4-5 lbs now? Should I send it off to be rebuilt?

mdvaldosta · October 5th, 2006, 04:38 PM

No dude, replace the belt first.

Darrell · October 5th, 2006, 04:55 PM

belt slip

jerb43 · October 5th, 2006, 06:59 PM

sweet! thanks guys! i really appreciate it! How freakin hard is to change a belt on a supercharger? Does anyone have a personal preference on a brand? how much are the belts?

MSO · October 5th, 2006, 08:01 PM

Originally Posted by mdvaldosta

You probably have a slipping belt, look for black dust around the pulleys. A new belt should fix it, Gatorback is preferred, the cheap stuff slips.

not to ride ya buddy, but i believe these questions were answered

its ok tho

welcome to MM, i assume u jus joined?

jerb43 · October 5th, 2006, 08:25 PM

Thanks My`StangOpens, but there is still 1 question still that still remains, how hard would it be to change one? Is there any diagrams? Also, the supercharger makes a noise, sorta like a grinding noise, now I know that superchargers make like a whistling noise, but this is somewhat of a grinding noise, that is why i thought the bearings or something was going out.

97TunedMustang · October 6th, 2006, 06:34 PM

The belt their referring to is simply your serpentine belt for the all the motors components. Also suggest you get a gatorback cause the cheaper belts dont cut it for superchargers. Check for dust near the s/c pulley indicating serpentine belt slippage. On the bad side it sounds like your bearings may be going out. I have a vortech v2 centrifugal s/c and when the bearings went out it started making a grinding noise also, although i dont recall it losing boost. i just recall it sounding very unhappy and it got progressively worse.

ChrisJ · October 7th, 2006, 02:39 AM

Belt Slip FTW on this one...

matrixpuba · October 7th, 2006, 08:11 AM

might want to check the bypass to see if it it bleeding boost too.

jimmy_cho-cho · October 14th, 2006, 06:47 PM

did you change your exhaust system to larger pipes after the supercharger upgrade????????

October 5th, 2006, 11:19 AM	#1
jerb43 Regular Join Date: Sep 2006 Posts: 185	Supercharger Is Loosing Boost! I bought a 1998 mustang GT with a vortech supecharger. I was getting 6lbs of boost, at 3000 rpm, and 10 lbs at 5000 rpm. But now I'm getting 0-1 lbs, and 4-5 lbs! could the supercharger be going out in it? someone help me please!! __________________ 1998 Mustang GT Super Charged! CGS Sub frames, Auto Meter gauges, Bassani Exhaust!

October 5th, 2006, 01:22 PM	#3
itschristorres8 SP00LIN V6 2000 Mustang V6 437rwhp 402rwtq V6 Join Date: Aug 2006 Location: south florida Posts: 14,696	do most s/c get fulll boost that late in the RPM band? __________________ The Sickest 6 The reason V8 owners on here hate me

October 5th, 2006, 04:19 PM	#5
jerb43 Regular Join Date: Sep 2006 Posts: 185	yeah, my supercharger used to get 10 lbs of boost at 5000 rpm, but for some reason its only getting 4-5 lbs now? Should I send it off to be rebuilt? __________________ 1998 Mustang GT Super Charged! CGS Sub frames, Auto Meter gauges, Bassani Exhaust!

October 5th, 2006, 04:55 PM	#7
Darrell Feb 08 ROTM 1990 Mustang LX 9.36@143 mph Join Date: Jan 2006 Location: Fond du Lac, Wisconsin Posts: 7,389	belt slip __________________ Racing in memory of Dave Bandt 11/19/69 - 3/23/08 "he's traded his wheels for wings" Professor of Natural Aspiration Thanks to: Artie at Trick Flow, Dave at Team Z Motorsports, Brian at Total Engine Airflow and Harold at Furo Racecraft

October 5th, 2006, 06:59 PM	#8
jerb43 Regular Join Date: Sep 2006 Posts: 185	sweet! thanks guys! i really appreciate it! How freakin hard is to change a belt on a supercharger? Does anyone have a personal preference on a brand? how much are the belts? __________________ 1998 Mustang GT Super Charged! CGS Sub frames, Auto Meter gauges, Bassani Exhaust!

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October 5th, 2006, 11:36 AM	#2
mdvaldosta Maintenance Man 2002 Mustang GT 11.47@120.58 Join Date: Aug 2005 Location: Valdosta, GA Posts: 3,943	You probably have a slipping belt, look for black dust around the pulleys. A new belt should fix it, Gatorback is preferred, the cheap stuff slips.

October 5th, 2006, 02:02 PM	#4
mdvaldosta Maintenance Man 2002 Mustang GT 11.47@120.58 Join Date: Aug 2005 Location: Valdosta, GA Posts: 3,943	Centrifugals do.

October 5th, 2006, 04:38 PM	#6
mdvaldosta Maintenance Man 2002 Mustang GT 11.47@120.58 Join Date: Aug 2005 Location: Valdosta, GA Posts: 3,943	No dude, replace the belt first.

October 5th, 2006, 08:25 PM	#10
jerb43 Regular Join Date: Sep 2006 Posts: 185	Thanks My`StangOpens, but there is still 1 question still that still remains, how hard would it be to change one? Is there any diagrams? Also, the supercharger makes a noise, sorta like a grinding noise, now I know that superchargers make like a whistling noise, but this is somewhat of a grinding noise, that is why i thought the bearings or something was going out. __________________ 1998 Mustang GT Super Charged! CGS Sub frames, Auto Meter gauges, Bassani Exhaust!

October 6th, 2006, 06:34 PM	#11
97TunedMustang Enthusiast Join Date: Jan 2006 Posts: 963	The belt their referring to is simply your serpentine belt for the all the motors components. Also suggest you get a gatorback cause the cheaper belts dont cut it for superchargers. Check for dust near the s/c pulley indicating serpentine belt slippage. On the bad side it sounds like your bearings may be going out. I have a vortech v2 centrifugal s/c and when the bearings went out it started making a grinding noise also, although i dont recall it losing boost. i just recall it sounding very unhappy and it got progressively worse. __________________ New block with forged internals running 16psi, tuned by Lasota Racing Too many mods to list... 3.73's and Truetrac Finally Done! Water-methanol injection? Dyno Tune fo sho, Street tune FTL!

October 7th, 2006, 02:39 AM	#12
ChrisJ MuchCoolerThanGTsetGO 2002 Mustang GT SLOW Join Date: Jun 2006 Location: Shepherdsville, Kentucky Posts: 16,286	Belt Slip FTW on this one... __________________ My Junk www.myspace.com/cjobe

October 7th, 2006, 08:11 AM	#13
matrixpuba Hardcore Enthusiast Join Date: Sep 2006 Location: tennessee Posts: 2,379	might want to check the bypass to see if it it bleeding boost too. __________________ http://img.photobucket.com/albums/v2.../matrixsig.jpg

October 14th, 2006, 06:47 PM	#14
jimmy_cho-cho Newbie Join Date: Oct 2006 Location: Augusta,Ga Posts: 6	maybe exhaust did you change your exhaust system to larger pipes after the supercharger upgrade????????

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Supercharger Is Loosing Boost!

Supercharger Is Loosing Boost!

maybe exhaust