pullied cobra difference?

bluestang1724 · February 2nd, 2012, 07:02 AM

how much of a diff will a 2.81 pulley make on the Cobra? I'm all stock besides magnaflow catback. I ran into a 2011 Roush stage 1 with a CAI, exhaust, and a tune and were were dead even. we went around a small curve and i was on the outside, and slowwwwly started to pull from him, i mean like a snail. i just was curious as to how much of a diff id see with a pulley and CAI (and a tune).

Calogero6685 · February 2nd, 2012, 07:59 AM

Stage one is pretty much a 5.0 from a roll. Sounds about right depending on driver.

bluestang1724 · February 2nd, 2012, 10:24 AM

will a pulley make a decent difference?

termi_GT · February 2nd, 2012, 11:47 AM

Pullies do help. Good rule of thumb on boost is for every 1 pound of boost increase equals 8-10 HP. A 2.93 pulley will increase boost 3-4 pounds so a 2.81 should be close to that maybe a tad more. I would say at least a 35 HP increase along with 25-30 TRQ to be on the safe side.

va boy · February 2nd, 2012, 09:09 PM

A 2.8 upper pulley and a tune will be a noticeable difference, no doubt you would be happy with it.

mustangmanv6@yahoo.com · February 15th, 2012, 11:27 AM

Just send it stegmeier and get it ported its not that expensive. For the money you will have lower temps, and you will see more power at a lower boost level. They do good work from what i have heard.

blownsnke · March 5th, 2012, 08:48 PM

just did a 2.81 and a tuner on my 03, noticed a big difference in power. need wider rear tires now for sure, on street tires you will spin 1-2 every time.

SonicBlu03 · March 5th, 2012, 10:51 PM

i had a 2.9, UPR intake, catless x, and magnaflow magnapack exhaust, made 430whp and 470wtq, seemed a bit high but maybe it was just the dyno, id say mustang man is right but personally id send the blower to Brian @ Posi, get his race port, run a 2.76 pulley with an idler set, and smash down 470-490 rwhp, $1000-$1200 in parts for 80-100hp increase over stock is nasty

va boy · March 5th, 2012, 10:56 PM

Originally Posted by blownsnke

just did a 2.81 and a tuner on my 03, noticed a big difference in power. need wider rear tires now for sure, on street tires you will spin 1-2 every time.

Yes, traction is gonna be a problem now, not a bad problem to have, it can be fixed!

89StangGT · March 5th, 2012, 11:28 PM

A pulley will make a huge difference. My car makes 444/447 with JUST a 2.9 pulley, K&N drop in filter (stock intake piping) and a MAC Catback (stock catted H pipe) and it's trapped 116mph.

Willie647 · March 22nd, 2012, 05:05 PM

I am interested in starting to do some mods like you have. Where can I get the pully and do I need to tune if I just do the pully and filter? I already have Bassani cat back exhaust and just want a little more power-for now.

rk_2000_Z/28 · March 22nd, 2012, 05:21 PM

My car made 475 to the rear wheels on a VERY conservative 91 octane tune, which is a little more than 100 over stock and my only horsepower mods are a ported blower, 2.93 upper pulley, CAI, and MAC mid-pipe and exhaust.

Make sure you spend the extra cash to get a nice set of idlers.

rk_2000_Z/28 · March 22nd, 2012, 05:24 PM

Originally Posted by Willie647

I am interested in starting to do some mods like you have. Where can I get the pully and do I need to tune if I just do the pully and filter? I already have Bassani cat back exhaust and just want a little more power-for now.

There are a lot of places but Lethal Performance is my favorite. And yes, you need a tune if you swap pulleys. Some companies sell kits that come with a hand held tuner pre-set for whatever size pulley you go with so you don't have pay for a dyno tune.

February 2nd, 2012, 07:02 AM	#1
bluestang1724 Regular 03 cobra, 95 gt, 00 v6 Join Date: Oct 2011 Location: Savannah, GA Posts: 250 iTrader: 0 reviews	pullied cobra difference? how much of a diff will a 2.81 pulley make on the Cobra? I'm all stock besides magnaflow catback. I ran into a 2011 Roush stage 1 with a CAI, exhaust, and a tune and were were dead even. we went around a small curve and i was on the outside, and slowwwwly started to pull from him, i mean like a snail. i just was curious as to how much of a diff id see with a pulley and CAI (and a tune). __________________ 2003 Redfire Cobra, 6-spd 1995 Laser Red GT 5-spd 2000 Atlantic Blue Metallic V6 5-spd

February 2nd, 2012, 10:24 AM	#3
bluestang1724 Regular 03 cobra, 95 gt, 00 v6 Join Date: Oct 2011 Location: Savannah, GA Posts: 250 iTrader: 0 reviews	will a pulley make a decent difference? __________________ 2003 Redfire Cobra, 6-spd 1995 Laser Red GT 5-spd 2000 Atlantic Blue Metallic V6 5-spd

February 2nd, 2012, 11:47 AM	#4
termi_GT Hardcore Enthusiast 12.41@114 Join Date: Dec 2011 Location: Joplin, MO Posts: 1,320 iTrader: 1 reviews	Pullies do help. Good rule of thumb on boost is for every 1 pound of boost increase equals 8-10 HP. A 2.93 pulley will increase boost 3-4 pounds so a 2.81 should be close to that maybe a tad more. I would say at least a 35 HP increase along with 25-30 TRQ to be on the safe side. __________________ MM FOBRA CLUB CO-FOUNDER

February 2nd, 2012, 09:09 PM	#5
va boy Regular 2003 Cobra Join Date: Dec 2010 Location: VA Posts: 320 iTrader: 0 reviews	A 2.8 upper pulley and a tune will be a noticeable difference, no doubt you would be happy with it. __________________ Whippled 03 Sonic Blue Terminator

March 5th, 2012, 10:51 PM	#8
SonicBlu03 Got twins? 2003 Mustang SVT Cobra Join Date: Jul 2010 Location: Lancaster NY Posts: 184 iTrader: 2 reviews	i had a 2.9, UPR intake, catless x, and magnaflow magnapack exhaust, made 430whp and 470wtq, seemed a bit high but maybe it was just the dyno, id say mustang man is right but personally id send the blower to Brian @ Posi, get his race port, run a 2.76 pulley with an idler set, and smash down 470-490 rwhp, $1000-$1200 in parts for 80-100hp increase over stock is nasty __________________ 2003 Ford Mustang SVT Cobra, Sonic Blue, 100+K miles MM Cobra Club #113

February 15th, 2012, 11:27 AM	#6
mustangmanv6@yahoo.com Newbie Join Date: Dec 2009 Posts: 27 iTrader: 0 reviews	Just send it stegmeier and get it ported its not that expensive. For the money you will have lower temps, and you will see more power at a lower boost level. They do good work from what i have heard.

March 5th, 2012, 08:48 PM	#7
blownsnke Newbie 2003 cobra Join Date: Sep 2011 Location: indianapolis Posts: 13 iTrader: 0 reviews	just did a 2.81 and a tuner on my 03, noticed a big difference in power. need wider rear tires now for sure, on street tires you will spin 1-2 every time.

March 5th, 2012, 11:28 PM	#10
89StangGT Moderator SVT Cobra Mustang Join Date: Aug 2006 Location: Toledo, Ohio Posts: 1,876 iTrader: 0 reviews	A pulley will make a huge difference. My car makes 444/447 with JUST a 2.9 pulley, K&N drop in filter (stock intake piping) and a MAC Catback (stock catted H pipe) and it's trapped 116mph. __________________ There's a reason Ford codenamed them the Terminator

March 22nd, 2012, 05:05 PM	#11
Willie647 Newbie Join Date: Dec 2008 Posts: 17 iTrader: 0 reviews	I am interested in starting to do some mods like you have. Where can I get the pully and do I need to tune if I just do the pully and filter? I already have Bassani cat back exhaust and just want a little more power-for now. __________________ www.westendelectric.com 2004 Screaming Yellow Cobra Terminator 2009 GT-500 Shelby 1964 Falcon Sprint,302 roller,cam etc. 2005 SRT-10 Viper Truck 1973 Corvette Stingray 2012 Ford f-350 diesal dually lariot Crew Cab

March 22nd, 2012, 05:21 PM	#12
rk_2000_Z/28 Forever in our hearts travis_afx 2003 SVT Cobra Join Date: Apr 2007 Location: Enid, OK Posts: 4,311 iTrader: 0 reviews	My car made 475 to the rear wheels on a VERY conservative 91 octane tune, which is a little more than 100 over stock and my only horsepower mods are a ported blower, 2.93 upper pulley, CAI, and MAC mid-pipe and exhaust. Make sure you spend the extra cash to get a nice set of idlers. __________________ 03 Cobra-Slow 02 SS, 00 Z/28-Gone Rest In Peace Travis Billings

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