How much RWHP can the stock 03 Cobra handle?

xenon · Feb 1, 2004

I originaly posted this question in the SVT section but man is it ever dead there. Anyways, here is my question.

I am looking into buying a 03/04 Cobra to replace my 01 GT.

How much RWHP can the stock cobra motor handle? The KB s/c looks like a good choice. Would the stock block handle 21-psi? What other mods would be needed to support all this power? I know the stock clutch would need to be replaced but what else?

Thanks guys.

Firemanz · Feb 1, 2004

Hey dude, post this question over on www.svtperformance.com also.

I have a friend that is running about 15-16psi with a K/B and is in the process of getting her shortblock rebuilt and installed. She posts on that site as well....

Lawrence

xenon · Feb 1, 2004

Has anybody ever seen the 1/4 mile specs on a stock cobra with the KB s/c?

http://www.kennebell.net/techinfo/ford-techinfo/cobraBoostPulleyRatio.pdf

Stock with Eaton s/c @ 8# - 12.7 @ 107mph
Stock with Kenne Bell s/c @ 9# - 12.0 @ 115mph
Stock with Kenne Bell s/c @ 21# - 10.8 @ 130mph!

These tests have been done on a bone stock 03 Cobra so I guess I can assume the stock block can handle at least 627hp with 21# of boost.

neoclasiccl · Feb 1, 2004

The only problem with the heads is the valve springs and the cooling problem. Dennis reinhart posted a thread on running cooling hoses off the back of the heads out the freeze plugs. I spoke with Tim (Cobra Killer)and he said these motors if built right should easily handle 600-700 HP

xenon · Feb 1, 2004

neoclasiccl said:
The only problem with the heads is the valve springs and the cooling problem. Dennis reinhart posted a thread on running cooling hoses off the back of the heads out the freeze plugs. I spoke with Tim (Cobra Killer)and he said these motors if built right should easily handle 600-700 HP

I would think this would help with the cooling issue

http://www.vortechsuperchargers.com/news/cobra_tank.html

yellow5.0cobra · Feb 1, 2004

SNEAKY PETE dipped into the 9's.

These engines can take a lickin.

4.6modular · Feb 1, 2004

1100 flywheel hp in one of the magazines that I've read. The fastest 03 Cobra has been running 9.59 at 144mph. But since then I think that Cobra has ran faster. It's a stock Cobra motor with stock heads and internals running a k/b supercharger at like 20-21 lbs. of boost and maybe, but maybe a shot of nitrous. Don't quote me on that. I've got a picture of that same Cobra on my locker at work but it's been a while since I've read the article.

ROBW9999 · Feb 1, 2004

nitrous pete did too

xenon · Feb 1, 2004

4.6modular said:
1100 flywheel hp in one of the magazines that I've read. The fastest 03 Cobra has been running 9.59 at 144mph. But since then I think that Cobra has ran faster. It's a stock Cobra motor with stock heads and internals running a k/b supercharger at like 20-21 lbs. of boost and maybe, but maybe a shot of nitrous. Don't quote me on that. I've got a picture of that same Cobra on my locker at work but it's been a while since I've read the article.

Whoa.. Ok im sold.. 03/04 Cobra its going to be.. I dont even see myself outgrowing this car. Thanks for the input guys

Roush97 · Feb 1, 2004

xenon said:
Whoa.. Ok im sold.. 03/04 Cobra its going to be.. I dont even see myself outgrowing this car. Thanks for the input guys

You're gonna love it, two things as simple as a catback and cai and you'll have around 400 hp...

xenon · Feb 1, 2004

Roush97 said:
You're gonna love it, two things as simple as a catback and cai and you'll have around 400 hp...

Thats funny I have been reading everything under the sun on the kennybell website and dyno test after dyno test they dont have any hp increase with any headers/xpipe/catback system under 600hp.

4.6modular · Feb 1, 2004

Get this. One of either MM&FF, or 5.0 and Super Fords did a K/B swap running something like 14-16 lbs. of boost and they had 600+hp. That was with the stock exhaust. Imagine 20+ lbs. of boost with a stroker motor , stage III ported heads, supercharger cams, and a full exhaust and a moderate tune.

xenon · Feb 1, 2004

4.6modular said:
Get this. One of either MM&FF, or 5.0 and Super Fords did a K/B swap running something like 14-16 lbs. of boost and they had 600+hp. That was with the stock exhaust. Imagine 20+ lbs. of boost with a stroker motor , stage III ported heads, supercharger cams, and a full exhaust and a moderate tune.

Yes that would be an insane combination.. Read this. I found this on the Kenne Bell website.

Many of our customers have run 128-131 mph in the 10's at over 600HP with ONLY the Kenne Bell Supercharger Kit (Supercharger, SWITCH CHIP, BOOST-A-PUMP) and Kenne Bell Cool Air Kit, Big Oval Throtle Body and Drag Street Radials. These times are with 18 psi boost and 93 octane pump gas. ET is dependant on traction. The ideal ET for 130 mph is 10.2 sec. Robert Juliana, a moderator on the Modular Ford Website, ran a 10.85@129 at 18 psi on 93 octane with the above combination. Tha was his goal - a "pure street" car in the 10's on 93 octane for under 40,000 (35,000 car and 5,000 in bolt ons)

Badd GT · Feb 2, 2004

i live about 15 miles from procharger & i was told a local guy is over 670rwhp from the procharger kit & he got about every bolt-on ready to install when they are done.

xenon · Feb 2, 2004

I would prefer buying a s/c that has been tested and true. Im sure Procharger made a nice solid kit for the Cobra but I dont enjoy bieng a test mule. I absolutely hate down time due to technical issues. I will definately keen an eye out for the kit thou. Sounds sweet.. Thanks

san~man · Feb 2, 2004

Why don't you just upgrade your current setup instead of taking a beating selling your car and then purchasing another car. I know you have the money now, but in some ways, it doesn't make sense.

With a stroker/built motor, a larger SC or a KB, and some other modifications, you would be well ahead/equal to a KB cobra, with less money output. And you can say you did it with a 2V.

Dunno, just a thought.

2K1GtfromSC · Feb 2, 2004

Anything over 15psi I would get 55lb injectors. Read more over @ svtperformance.com there is a lot of info on KB there.

wjfawb0 · Feb 2, 2004

The cobras seem to handle 550rwhp with ease. Once you get over 600rwhp I have heard that the clutch will more than likely slip. With a stock block and the eaton blower probably the best number to shoot for without nitrous is 500rwhp. The KB by itself should put you around 550rwhp. I don't plan on getting my car around 600rwhp for a few more years. It is plenty of fun on the interstate and around town right now. Believe me, if I had the money, T&J Performance would have my car right now doing all sorts of things to it. It'll happen sometime.

-Jason

Roush97 · Feb 2, 2004

xenon said:
Thats funny I have been reading everything under the sun on the kennybell website and dyno test after dyno test they dont have any hp increase with any headers/xpipe/catback system under 600hp.

are you saying what i posted previously is bs? if you would take a look in my sig, the second car down is an 03 cobra...with nothing more than a Pauls hp cai and borla stinger catback i made 397rwhp and 377rwtq...if infact you were saying bs about what i said, you need to take a look at things before you call bs...come on over to svtperformance.com and do some research and you'll see what im saying is not bs

mogs01gt · Feb 2, 2004

X2C racing has a turbo kit on a stock block and heads 03 cobra. I think its like 700rwhp, that is over 800 motor.

How much RWHP can the stock 03 Cobra handle?

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