03 Cobra
Launching!
Joined: Jul 2003
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From: Baytown TX
Re: 03 Cobra http://www.blueovalnews.com/2003/pow...ead.072903.htm
2003 Mustang Cobras Have Defective Engine Cylinder Heads
29 July 03
Robert Lane
According to a Ford Motor Company memo, 2003 Ford Mustang Cobras may have defective engine cylinder heads. The memo noted that the Cobras may exhibit an unusual engine noise that is present at all temperature ranges during engine idle. The memo also states that the noise may be due to bad cylinder head valve guides in the left hand cylinder head. The noise may be heard at the rear of the left hand cylinder head, thought the left side exhaust or at the left front wheel of the vehicle.
If your 2003 Cobra Mustang exhibits this condition, Ford may replace the cylinder head and cam assembly. The replacement cylinder head part number is: 3R2Z-6049-GA. Owners are advised to have their vehicles inspected before the warranty period expires.
This is considered a "silent recall" where upon Ford may NOT notify owners of this condition. For more information, it is suggested that owners contact Pat Hoye (313) 248-8336 at Ford World Headquarters.
Updates at BlueOvalNews.com
Makes me want to go sell the Vette and get one
2003 Mustang Cobras Have Defective Engine Cylinder Heads
29 July 03
Robert Lane
According to a Ford Motor Company memo, 2003 Ford Mustang Cobras may have defective engine cylinder heads. The memo noted that the Cobras may exhibit an unusual engine noise that is present at all temperature ranges during engine idle. The memo also states that the noise may be due to bad cylinder head valve guides in the left hand cylinder head. The noise may be heard at the rear of the left hand cylinder head, thought the left side exhaust or at the left front wheel of the vehicle.
If your 2003 Cobra Mustang exhibits this condition, Ford may replace the cylinder head and cam assembly. The replacement cylinder head part number is: 3R2Z-6049-GA. Owners are advised to have their vehicles inspected before the warranty period expires.
This is considered a "silent recall" where upon Ford may NOT notify owners of this condition. For more information, it is suggested that owners contact Pat Hoye (313) 248-8336 at Ford World Headquarters.
Updates at BlueOvalNews.com
Makes me want to go sell the Vette and get one
HMMMMMM. CT sure this is nothing you dont know about but still.
TECH Resident
Joined: Mar 2002
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From: Kemah, Tx.
Re: 03 Cobra A pulley swap is a minor bolt-on for a Cobra though. With MINOR mods a cobra is at 460rwhp and around 11.8 @ 119mph.
Teching In
Joined: Aug 2003
Posts: 36
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From: The hot Desert
Re: 03 Cobra I think the issue with 03 Cobras not running real real quick 1/4 times is 3 things.
1 is their gears.
2 is their IRS.
3 Weight
Bob Cosby on the corral.net and on LS1.com has run 11.6's on his 99 Cobra. He only has 312 rwhp. Had 4:56's in the rear and has his cars weight below 3100 lbs.
So bu putting a Cobra on a diet, and changing up the gears you could hit 11's real easy.
I also think most people who see slow 03 Cobras and have beat them with stock or near stock cars may have possibly been beating the drivers of those Cobras.
I have a 98 Cobra with a 125 shot. It's a vert, I have droped the weight to 3250 and am running mid 11.6's on a 28" slick with 4:10's.
1 is their gears.
2 is their IRS.
3 Weight
Bob Cosby on the corral.net and on LS1.com has run 11.6's on his 99 Cobra. He only has 312 rwhp. Had 4:56's in the rear and has his cars weight below 3100 lbs.
So bu putting a Cobra on a diet, and changing up the gears you could hit 11's real easy.
I also think most people who see slow 03 Cobras and have beat them with stock or near stock cars may have possibly been beating the drivers of those Cobras.
I have a 98 Cobra with a 125 shot. It's a vert, I have droped the weight to 3250 and am running mid 11.6's on a 28" slick with 4:10's.
Re: 03 Cobra 
Uh....... 6's BSBSBSBS wow, is that your eighth mile I hope, either way that is way way way too fast for that car with no major mods other then nitrous. If that is your 1/4 mile time then get off the site because you know nothing about cars, and are making some serious claims. If you are running 6's in the 1/8 congrats, you are one person I want t see race. 
Administrator
Joined: Jan 2002
Posts: 45,841
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From: Earth
Re: 03 Cobra
Unit213, was that you I was playing with on Outer drive and later Rotunda a couple weeks ago?
TECH Senior Member
Joined: Jun 2003
Posts: 9,339
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From: NYC metro area
Re: 03 Cobra
If my g/f was in the car there is no chance of me having any fun.
heh heh. 
Launching!
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Re: 03 Cobra Blown281 at LS1.com has the best performance numbers I have seen for a bolt-on 03 Cobra. He had all the bolt-ons(pulley, exhaust, chip, etc..), he was also running 20 lbs of boost on the stock blower(which is not good, the blower will not last long), and made 515rwhp and ran 10.8x at 126mph. Now he has a Kenne Bell Blower at 19 lbs of boost and makes 620ish rwhp. He has also run 10.3s at 130 mph with the kenne bell blower. He is planning on being the first 03 Cobra with the stock 6 speed, stock irs, and no nitrous in the 9s.
Administrator
Joined: Jan 2002
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From: Earth
Re: 03 Cobra The eaton blower can only take 13-14psi without over spinning it. Anything more than that and you're shooting yourself in the foot due to lack of efficiency and heat soak. It is a piece of cake to get to 460rwhp on an '03 Cobra. Getting to and past 500rwhp is the expensive part.
Teching In
Joined: Aug 2003
Posts: 36
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From: The hot Desert
Re: 03 Cobra I haven't seen a comparo of the current 03 heads with the new FRPP heads but they may be able to get you past 500 RWHP.
The new head and intake package is getting guys with 98 Cobras past 400 RWHP N/A
The new head and intake package is getting guys with 98 Cobras past 400 RWHP N/A
TECH Resident
Joined: Jul 2003
Posts: 765
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From: Petersburg, MI
Re: 03 Cobra
If my g/f was in the car there is no chance of me having any fun.
heh heh. 
. What can I say though, she's killer. She also wants a 30th anniversary TA. Maybe after we get married next year we'll get a 30th and have his & hers TA's. Administrator
Joined: Jan 2002
Posts: 45,841
Likes: 5
From: Earth
Re: 03 Cobra
I haven't seen a comparo of the current 03 heads with the new FRPP heads but they may be able to get you past 500 RWHP.
The new head and intake package is getting guys with 98 Cobras past 400 RWHP N/A
The new head and intake package is getting guys with 98 Cobras past 400 RWHP N/A
Teching In
Joined: Aug 2003
Posts: 36
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From: The hot Desert
Re: 03 Cobra
I haven't seen a comparo of the current 03 heads with the new FRPP heads but they may be able to get you past 500 RWHP.
The new head and intake package is getting guys with 98 Cobras past 400 RWHP N/A
The new head and intake package is getting guys with 98 Cobras past 400 RWHP N/A
For pre 03 Conbras that intake kit isn't that bad in $$$ considering it comes with MAF, injectors, computer, upper and lower intake and the actuator for the variable geometry for the runners.
Teching In
Joined: Aug 2003
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From: The hot Desert
Re: 03 Cobra
I got a good deal and spent nearly 7 G's
They should allow the 4.6 to hit 400 RWHP with no problems. They will also give me a better range of available HP when I reinstall my N20 or if I go to a Turbo which Im thinking about soon here in the future.
TECH Senior Member
Joined: Jun 2003
Posts: 9,339
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From: NYC metro area
Re: 03 Cobra
Heads, cams, valves, and the intake package. The intake alone is nearly 3K. The heads bare are almost 2K. The cam package with valves, springs, etc is 1500 bucks. Tax etc and it comes out to about 7K.
They should allow the 4.6 to hit 400 RWHP with no problems. They will also give me a better range of available HP when I reinstall my N20 or if I go to a Turbo which Im thinking about soon here in the future.
They should allow the 4.6 to hit 400 RWHP with no problems. They will also give me a better range of available HP when I reinstall my N20 or if I go to a Turbo which Im thinking about soon here in the future.
Teching In
Joined: Aug 2003
Posts: 36
Likes: 0
From: The hot Desert
Re: 03 Cobra
Heads, cams, valves, and the intake package. The intake alone is nearly 3K. The heads bare are almost 2K. The cam package with valves, springs, etc is 1500 bucks. Tax etc and it comes out to about 7K.
They should allow the 4.6 to hit 400 RWHP with no problems. They will also give me a better range of available HP when I reinstall my N20 or if I go to a Turbo which Im thinking about soon here in the future.
They should allow the 4.6 to hit 400 RWHP with no problems. They will also give me a better range of available HP when I reinstall my N20 or if I go to a Turbo which Im thinking about soon here in the future.
Can't forget Im buying 4 cams, 32 valves, 32 Springs and 32 of all the other hardware.
The intake is pretty trick with variable geometry intake runners which make great low end and upper rpm HP. The heads should flow (velocity) better or damn near as good as 03 Cobra heads (although I think the exhaust valves is just smaller)they also can handle a much higher volume. The cams will actually give me a big increase in power. Ford skimped us a little bit on the cams for emission rerasons. I could very well get over 400RWHP. 425 like you mentioned is a very realistic possibility with a good tune in conjunction with the rest of my mods but the guys at Ford are making a flat claim (although not offical) of about 400rwhp after the swap. People are getting 330RWHP NA in 99+ Cobra motors and this head and intake package is tons better than their setups.