Quick Boost Question

racinjason89 · 03-10-2006, 08:52 PM

I'm not sure where to post this, so here it is. I have a 96 mystic with a kenne bell on it. I've adapted a 2.2L Blowzilla, but it's putting out more boost than I want. Unfortuately, I can't go bigger on the blower pulley because of the belt routing (it will rub itself). My question is: If I get an underdrive crank pulley that is 25% smaller than stock, will this take away 25% of the boost? Or is there some equation I need? Someone please help!

Dave B. · 03-11-2006, 11:10 PM

how much boost is it making?

racinjason89 · 03-12-2006, 02:02 PM

20-22 PSI

blk04cobra1 · 03-12-2006, 03:18 PM

that's definitely not the stock pulley...

racinjason89 · 03-12-2006, 05:47 PM

It's the 12 psi pulley that comes with a 2.2L blower (or so KB says). There is no actual 2.2L kit for my car. I custom fabricated a bypass for it! I think the underdrive crank will do the trick, but I just wanted someone elses input!

Dave B. · 03-12-2006, 10:34 PM

I must admit that I am not qualified to answer your question on that kind of problem

NO 5 OH · 03-13-2006, 12:47 AM

Jason... you are correct in your thoughts in that the smaller the crank pulley is the less boost you will see. To give you an idea... all the "lower" kits for the 03/04 Cobras make their boost by increasing the size of the lower crank pulley. I can't say as to how much boost you'll drop with a 25% underdriven crank pulley but it will be less than the current 21-22 psi you're seeing now.

You could always run race gas and get it tuned for that boost... it would be really fun

Hope this helps,

Shannon

Ram77mus · 03-14-2006, 08:13 PM

I WOULD START WITH THE UNDER DRIVE PULLEY- THAT A LOT OF BOOST ,AND IF IT'S A STOCK SHORT BLOCK- OOOOO'BOY

racinjason89 · 03-14-2006, 10:52 PM

I ordered the pulley today. The problem with all that boost, my car hates any timing! Therefore, HP numbers aren't what they should be! So my thought was to lower the boost a few psi and add timing. I should know in about a week. I appreciate all the help. I'll try to repost about the results. And by the way, not a stock short block! I'm not quite that crazy!!

03-10-2006, 08:52 PM	#1
racinjason89 Registered User Join Date: May 2003 Location: N. Augusta, S.C. Posts: 126	Quick Boost Question I'm not sure where to post this, so here it is. I have a 96 mystic with a kenne bell on it. I've adapted a 2.2L Blowzilla, but it's putting out more boost than I want. Unfortuately, I can't go bigger on the blower pulley because of the belt routing (it will rub itself). My question is: If I get an underdrive crank pulley that is 25% smaller than stock, will this take away 25% of the boost? Or is there some equation I need? Someone please help! __________________ '03 Torch Red Anniversary '96 mystic (Sold) '99 5.0 Exploder '89 GT (Gram's Car) Check out the all new mustang only website: www.stangbay.com

03-11-2006, 11:10 PM	#2
Dave B. Registered User Join Date: Dec 2003 Location: Florida Posts: 479	how much boost is it making? __________________ 03 Cobra 10th Anniversary Red Stiegermeier Stage 4 ported Eaton 511.9 RWHP 467.7 RWTQ 2,76 Billetflow SC pulley Billetflow Aux-idler all billetflow idler pulleys Accufab single blade MAC cold air BBK Ceramic LT headers X-pipe Magnaflow exhaust Gordsford heat exchanger PST Carbon fiber drive shaft lowered 1.5 inches 18 X 9's AFS running Toyos 275/35/18's front 18 X 10.5's AFS running Toyos 295/35/18's rear Cobra "R" rear wing Cobra "R" hood 4:10 gears Pedator tuned Pro short shifter Hurst "T" handle Promotion Clutch Quad AEM widband gauge Boost & fuel Press gauges drilled & slotted rotors

03-12-2006, 02:02 PM	#3
racinjason89 Registered User Join Date: May 2003 Location: N. Augusta, S.C. Posts: 126	20-22 PSI __________________ '03 Torch Red Anniversary '96 mystic (Sold) '99 5.0 Exploder '89 GT (Gram's Car) Check out the all new mustang only website: www.stangbay.com

03-12-2006, 03:18 PM	#4
blk04cobra1 Registered User Join Date: Nov 2004 Location: Charlotte, NC Posts: 1,374	that's definitely not the stock pulley... __________________ 2004 Cobra HP Twin 67's 785rwhp on 9lbs of boost

03-12-2006, 05:47 PM	#5
racinjason89 Registered User Join Date: May 2003 Location: N. Augusta, S.C. Posts: 126	It's the 12 psi pulley that comes with a 2.2L blower (or so KB says). There is no actual 2.2L kit for my car. I custom fabricated a bypass for it! I think the underdrive crank will do the trick, but I just wanted someone elses input! __________________ '03 Torch Red Anniversary '96 mystic (Sold) '99 5.0 Exploder '89 GT (Gram's Car) Check out the all new mustang only website: www.stangbay.com

03-12-2006, 10:34 PM	#6
Dave B. Registered User Join Date: Dec 2003 Location: Florida Posts: 479	I must admit that I am not qualified to answer your question on that kind of problem __________________ 03 Cobra 10th Anniversary Red Stiegermeier Stage 4 ported Eaton 511.9 RWHP 467.7 RWTQ 2,76 Billetflow SC pulley Billetflow Aux-idler all billetflow idler pulleys Accufab single blade MAC cold air BBK Ceramic LT headers X-pipe Magnaflow exhaust Gordsford heat exchanger PST Carbon fiber drive shaft lowered 1.5 inches 18 X 9's AFS running Toyos 275/35/18's front 18 X 10.5's AFS running Toyos 295/35/18's rear Cobra "R" rear wing Cobra "R" hood 4:10 gears Pedator tuned Pro short shifter Hurst "T" handle Promotion Clutch Quad AEM widband gauge Boost & fuel Press gauges drilled & slotted rotors

03-13-2006, 12:47 AM	#7
NO 5 OH Registered User Join Date: Nov 2001 Location: Hickory, NC Posts: 1,613	Jason... you are correct in your thoughts in that the smaller the crank pulley is the less boost you will see. To give you an idea... all the "lower" kits for the 03/04 Cobras make their boost by increasing the size of the lower crank pulley. I can't say as to how much boost you'll drop with a 25% underdriven crank pulley but it will be less than the current 21-22 psi you're seeing now. You could always run race gas and get it tuned for that boost... it would be really fun Hope this helps, Shannon __________________ 03 Torch Red 10th Anniversary Convertible A few bolt-on's, a black supercharger and some boost... The replacement for displacement has "Whipple" cast into it. Chuck Norris built my Cobra. It runs off the tears of small children and makes 10,000 horsepower. He calls it his "street version."

03-14-2006, 08:13 PM	#8
Ram77mus Registered User Join Date: Feb 2006 Location: SC Posts: 168	I WOULD START WITH THE UNDER DRIVE PULLEY- THAT A LOT OF BOOST ,AND IF IT'S A STOCK SHORT BLOCK- OOOOO'BOY __________________ SCT Level 4 Trained Tuner with over 12 years of experience in the automotive performance industries. Throttle, Bottle or Boost - First to the Finish Line "WINS" www.powercurvemotorsports.com

03-14-2006, 10:52 PM	#9
racinjason89 Registered User Join Date: May 2003 Location: N. Augusta, S.C. Posts: 126	I ordered the pulley today. The problem with all that boost, my car hates any timing! Therefore, HP numbers aren't what they should be! So my thought was to lower the boost a few psi and add timing. I should know in about a week. I appreciate all the help. I'll try to repost about the results. And by the way, not a stock short block! I'm not quite that crazy!! __________________ '03 Torch Red Anniversary '96 mystic (Sold) '99 5.0 Exploder '89 GT (Gram's Car) Check out the all new mustang only website: www.stangbay.com

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