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How much boost can a stock 03 mustang GT take safely?

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Old 07-17-2008, 12:41 PM   #1
Dragonus18
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Default How much boost can a stock 03 mustang GT take safely?

I'm curious because I now have the money and am about to buy a procharger. I'm leaning towards the 3-core procharger model but I want to know if my car can handle it. The only mods I have are a roush cold air intake, BBK long tube headers and high flow X-pipe, and a Borla muffler. That's about it. What do you guys think?
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Old 07-17-2008, 12:53 PM   #2
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Default RE: How much boost can a stock 03 mustang GT take safely?

Most people say 450rwhp is where to stop because the rods will bend. I would play it safe at about 400 rwhp.
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Old 07-17-2008, 12:54 PM   #3
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Default RE: How much boost can a stock 03 mustang GT take safely?

I have heard many different thought on this subject. I have heard of ppl running 12 psi on stock bottom ends and never having a problem it all depends on how u drive the car and how well its tuned i guess. I have heard this rule of thumb: 0-4lbs its safe, 4-6lbs might not or might break, 6-10lbs its going to break but no one knows when, 10+ lbs broke LOL this is just based on what some guy told me once. I'd say there is a number of factors to base this info as above tunes and driving method etc. I have the 8lb P1sc kit and my car runs fine i want it at 10lbs but i think i am going to wait till the winter and build my engine and raise my boost where the endine will be relaible.
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Old 07-17-2008, 12:56 PM   #4
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Default RE: How much boost can a stock 03 mustang GT take safely?

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ORIGINAL: defconfire

Most people say 450rwhp is where to stop because the rods will bend. I would play it safe at about 400 rwhp.
I'd watch the pistons also they are very weak in the 4.6l engines, They will break before the rods i would think
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Old 07-17-2008, 01:01 PM   #5
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Default RE: How much boost can a stock 03 mustang GT take safely?

How much horsepower would my car go up to with a 3-core supercharger? Mind you it's intercooled.
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Old 07-17-2008, 01:05 PM   #6
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Default RE: How much boost can a stock 03 mustang GT take safely?

still i wouldnt go over 400-425. The rods are rated at 450. the pistons arn't much better but the rod are by far the weakest link in these engines.


EDIT: a 3 core can make more than enough power to break the stock engine. so be careful
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Old 07-17-2008, 01:10 PM   #7
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Default RE: How much boost can a stock 03 mustang GT take safely?

I wouldn't run no more than 8 lbs of boost on that motor.
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Old 07-17-2008, 01:11 PM   #8
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Default RE: How much boost can a stock 03 mustang GT take safely?

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ORIGINAL: Dragonus18

How much horsepower would my car go up to with a 3-core supercharger? Mind you it's intercooled.
The P1sc is not a 3 core supercharger better yet what is a Numbered core supercharger? The intercooler is 3 core and 2 core the stage 2 kit comes with a 3 core intercooler and you can choose your boost level via smaller dia pulleys when ordering. The stage one kit comes with a 8psi pulley and a 2 core intercooler.
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Old 07-17-2008, 01:13 PM   #9
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Default RE: How much boost can a stock 03 mustang GT take safely?

Procharger recommends 8 lbs on a 2003 GT which will give you around 350-370 rwhp. Most guys will say the maximum is 10 lbs of boost which puts you near 400 rwhp but you have to have a good tune for the engine to take it. Procharger offers a free 1-year or a purchased 3-year warranty if you get the P-1SC with the 8 lbs pulley. For the $75 purchase price of the 3-year warranty you get six bottles of oil so the warranty is basically free. The warranty isvoided with the 10 lb pulley. For the most part the stock MAF will work with the 8 lbs Procharger. I had to get a Diablosport MAFia because of my other mods. It or a Lightning MAF will be required for the 10 lbs Procharger. A lot of guys recommend getting the D-1 Procharger but that is not necessary unless adding forged rods and pistons are in your plans because the P-1SC is capable of providing more horsepower than the stock rods and pistons can take. If your car is a daily driver and you don't want to take chances get the 8 lbs pulley and the 3-year warranty. If your more of a risk taker go with the 10 lbs pulley. But with boost there are no gaurantees.Some guys can run420 rwhp without any trouble. Sometimes (rare, but it happens) the motor comes apart on the dyno at 350 rwhp.
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Old 07-17-2008, 01:13 PM   #10
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Default RE: How much boost can a stock 03 mustang GT take safely?

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ORIGINAL: 02 Ninja

I wouldn't run no more than 8 lbs of boost on that motor.
+1 my kit is rated 8lb but i am only getting 6.4lbs so i am going to buy a power Pipe to get it around 8psi
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Old 07-17-2008, 01:15 PM   #11
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Default RE: How much boost can a stock 03 mustang GT take safely?

Wait, What does prochargers warranty cover. Is it your whole engine?
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Old 07-17-2008, 01:19 PM   #12
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Default RE: How much boost can a stock 03 mustang GT take safely?

No i don't think it covers the full engine i thinks it just the Procharger Kit itself
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Old 07-17-2008, 01:22 PM   #13
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Default RE: How much boost can a stock 03 mustang GT take safely?

Damn. If it did i would have just purchased a procharger and would be chewing through an engine a month
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Old 07-17-2008, 01:26 PM   #14
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Default RE: How much boost can a stock 03 mustang GT take safely?

How can a 3-core make enough to blow my engine? I went to the procharger website and they said that was the highest I could get. I only want to make the supercharger get a max of 10psi. That's what I was told was the highest I could go safely without blowing anything. On the website they show a pic of my car which is a 03 mustang GT and the gains they get but mention nothing about changing anything in the car in order to be able to handle this. http://procharger.com/FORD/ford_auto.shtml
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Old 07-17-2008, 01:48 PM   #15
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Default RE: How much boost can a stock 03 mustang GT take safely?

Go with the 3 core so you have it and you will be ok to run 3.33" pulley. You will probably be around 400-420 rwhp with 11 psi with a complete bolt on car. I would keep it around 400 with a good tune. I am running 11 psi at 5950 rpms on a stock block 3,000 miles on it. I am at 390 rwhp on mustang dyno.
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Old 07-17-2008, 02:27 PM   #16
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Default RE: How much boost can a stock 03 mustang GT take safely?

Yea i just raised mine to form a 9psi pulley to a 10psi pulley and iam running kenne bells tune and its very conservitive so its all in the tune i guess.
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Old 07-17-2008, 04:36 PM   #17
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Default RE: How much boost can a stock 03 mustang GT take safely?

I plan on having this car as my daily driver so I'm going to take what you guys say here to heart when I consider my purchase. I just don't want to over-do it. Yet I don't want to under-do it ether. Are there any cons to getting a supercharger? I know someone told me that I have to use premuim gas when I get it. Now I know that the car is going to whine even at idle. Is there anything else I should know? I just want to get the most amount of info possible so I can really know what I'm getting myself into. Thanks to everyone who's replied so far. I truly value your input.
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Old 07-17-2008, 04:50 PM   #18
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Default RE: How much boost can a stock 03 mustang GT take safely?

As the gas issue goes i know when you order a kb they ask you want your tune for 91 or 93 octane. i picked 93 just to be on the safe side of any detonation especially with 10psi. as for your daily driver thats a toss up cause you can keep your car at low rpms on the street with the kb but thats no fun lol but a centri i think would be better on gas milage if thats what your concered of. as for the whine procharger and vortech whistle pretty loud at idle but very descreet at WOT and the kenne bell is just the oposite mine has very little whine at idle if any but at WOT you can hear it bout 1/2 mile down the road. All in all its what you plan on doing with the car taking it to a track frequently or just a street car. KB street car, Centri more for track car
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Old 07-17-2008, 05:57 PM   #19
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Default RE: How much boost can a stock 03 mustang GT take safely?

get the 3-core and its all in the tune...about 10psi...12psi is a ticking time bomb
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Old 07-17-2008, 08:45 PM   #20
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Default RE: How much boost can a stock 03 mustang GT take safely?

The procharger warranty only covers the charger, not the engine it's going on. You'll be fine with a 3.5 pulley.
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Old 07-17-2008, 08:45 PM
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