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how to get 400 hp

35K views 232 replies 38 participants last post by  gaetz1985  
#1 ·
i have a 2003 v6 mustang with 96,000 miles on it

i am saving a lot of money to improve my horsepower on my mustang. i want around 390-400 horsepower

can anyone tell me a way to get that amount.. i want to get some ideas before i go ahead and start spending money:D:D:D
 
#2 ·
oly damn, 400 on a v6?

Im no expert, but i know you need to beef up the internals, and specially drivetrain to handle that amount of power. Start there

ex. lookin up GT parts, and drivetrain parts, along with this supersixmotorsports.com
 
#4 ·
i mean im just the forum jackass i dont know anything SUPER technical, im here for looks:p

ahh what i suggest before the real guru's get in here is post things like this

Budget
wants for the car
experience level
time frame wanting it done
will you be getting someone else to do the bulk of the work, or DIY
what you were thinking about getting, so they can say yay or nay to

and anything that will help us out to help you out. because as long as you use the search thread button at the top of the page, dont ask repetitive questions, and is respectful, you'll get more information that will surprise your average mechanic or joe shmo at autozone
 
#6 ·
....400 hp on a sixer is gonna require a pretty considerable amount of money and a lot of work.
I'm talking engine rebuild, mainly to be able to handle running above 7 psi of boost in a supercharger or turbo charger (which are mostly the only way to get those kind of numbers from a V6). New rear end to put the power down and not break your stock one. Cam. 3.73 or 4.10 gears ( not horsepower related but it will help). Underdrive pulley. etc etc.
 
#9 ·
What do you want it to run in the 1/4?

Turbo is the way to go, you could make 400 without building the motor but then you start to sacrifice reliability.

A set of forged pistons, rods, and your crankshaft cleaned up with a 62-1 turbo on stock heads and intakes with about 12psi would make 400easy.
 
#11 ·
you could get to 300 with either some engine work and a cam if you want to stay N/A... or you could go turbo or supercharged and run a lower boost and get to about 300.
a 75-100 shot of nitrous wouldn't hurt either.

I mean I'm not an expert on this by any means though. There are a some guys on here with 300+ horsepower v6's that could better answer.
 
#13 ·
The money spent on getting 400 would be equivalent to getting a Mach1 or a supercharged GT.

However, it is possible.

-First, you need to beef up to a 4.2. It is stronger and can easily handle the 400 hp.
-Secondly, replace your stock upper intake with the Windstar kit. Replace lower with a ported/polished one.
-Must replace cams with a cam for turbos.
- Need to replace the rear end or rebuild your 7.5.
-Last, custom turbo set up

That should do it for you.

The 300-320 range is alot easier. Just a vortech or procharger kit and maybe the windstar intake.
 
#15 ·
I dont know honestly, but id keep your mustang now asa DD or whatever it is now and use the money you would have spent into a badass GT, there are some pretty good deals out there. Its just throwing away money into a 6 if you want serious horsepower. Unless your hell bent on staying a 6. Then well do what you want

just my :2cents
 
#16 ·
I agree personally...I'm not planning on doing much to my car really. Dual exhaust, CAI...maybe a windstar swap at some point. Thats about it. Maybe a few non performance mods. It is my daily driver so I don't need a race car or anything. I'll get a GT when I'm done with school and my insurance drops for not being "at risk" for being under 25.
 
#17 ·
^ ha I'll get a GT when cops stop being dicks and pull me out of the pack to pull me over because I'm the one with the shiny black mustang :mad:

just venting, got a ticket today, reckless, almost got arrested, yay for 6th ticket!!

but please dont post your bs about cops doing there job and its ignorant of me to do so because its complete bs im tired of hearing it. Cops have selection, and that selection is me, and im tired of it.

BUT OKAY, back to the thread :p
 
#227 ·
keep your record clean, I have been pulled over so many times and cops yell and scream my tints too dark my exhaust is too loud, then they go back pull up my record see i only have an expired tabs ticket(which was a 2nd degree neg ticket reduced) come back to the car say my record wasnt was they expected and let me go free
 
#18 ·
i like my v6 will never sell it for a GT i rather make my v6 faster than a GT and make fun of the guy with that GT:D

is the power pack stage 3 with nitrous, 3.73 gears with the posi track

other mods i was looking at was:
UDP
Throddle body with spaccer
K&N CAI
SCT Tunner

what numbers will i be at:confused:
 
#22 ·
Not sure what kind of gains you will make from a UDP and throttle body...
the K&N CAI isn't worth the extra money over the American Muscle one so save yourself about a $150. That you will pick up maybe 2-4 horsepower. The Tuner depends on what tune you run and your other mods.
I'd say less than 220 personally with those personally but thats a guesstimate cuz idk about the UDP and throttle body and depending on your tune.
 
#19 ·
Wow...so much misinformation in this thread.

Baby steps...
1.turbo...(I like the pt-67 personally)
2. fuel mods...min of #39 injectors and a focus fuel pump will get you to 400
3. Custom tuning
4. waste gate and bov...you might want to look into a boost controller also
5.custom turbo header and exhaust down pipe
6. oil lines and other misc parts you will need


On a v6 I would set my goal a lilttle lower than 400 out the gate, until you get a good understanding of how things work on your car and know the weak points. over time...upgrade the weak points and when your ready..turn it up.

btw...I'm making the power in my sig with a stock block 3.8l. Havent pushed the envelope to go for 400 yet...but it;s there if I want.
 
#36 ·
I'm running 10-11psi with a supercharger and stock internals.

You'll easily see 300-325hp to the wheels out of an intercooled supercharger with 10-11psi.

Doesn't cost that much, you can do it yourself(except the tune) and then you'll have power that's always there.
 
#29 ·
this is looking like another post of questions that will never see reality. If you know this little about your car or cars in general then your goals are very unlikely. But that being said, if you have the money to build your 6 up to that power why not get yourself one of the 2011 v6s? That way you can still laugh at the older model gt owners by having a v6 stock making more power.
 
#31 ·
this is looking like another post of questions that will never see reality. If you know this little about your car or cars in general then your goals are very unlikely. But that being said, if you have the money to build your 6 up to that power why not get yourself one of the 2011 v6s? That way you can still laugh at the older model gt owners by having a v6 stock making more power.
I was kind of thinking the same thing...
 
#33 ·
Being knowledgeable about your car and the task in hand will yield better results, no matter what you think you know.

But for know just read and read and read a ton about your car and engine set up, like know your 3.8 like its tattooed on your dick
 
#37 ·
if you really have the $ to spend on the stage 3 powerpack then yes do it,

call someone from supersixmtorsports and tell them what your goal is, they have crate engines if you wanna spend some real $$

just remember that if your really going to want to get into that range your going to upgrade more than the stuff under your hood...8.8 rear end, suspension

research through many threads and find out from people who have already done such things on how to proceed before going all out
 
#39 ·
so many people post useless ****, he told you his goals, he wants 400 hp. The fastest way to get there is to spend money, and not on bolt on **** that will not help much.

ssms has whole engines you can purchase that bolt in, you would need to buy that engine + a new tranny and new rear end. these pre built engines come with superchargers and cost about 8grand and give like 600 hp im sure you could get less hp for less money aswell.

Essentially if you wana use your current engine youl want a new cam, Forged internals will help prevent blowing up your engine under boost (which you will need) I personally like superchargers rather than turbo's they give a better sound, same amount of power with less work and less potential to explode and look cooler IMO turbos are for ricers. You will want an 8.8 rear end which isnt very expensive or hard to install, you will need a new clutch and or transmission, clutch at minimum though. Back to the engine, you will want to port and polish your heads, you will need a bigger TB and bigger gas pump. Trivial items will be needed aswell, plugs/wires, probably a better exhaust unless yours is already a dual. Im sure im forgetting all kinds of stuff, but essentially you need to completly rebuild your engine and drivetrain and suspension.
 
#40 ·
so many people post useless ****, he told you his goals, he wants 400 hp. The fastest way to get there is to spend money, and not on bolt on **** that will not help much.

ssms has whole engines you can purchase that bolt in, you would need to buy that engine + a new tranny and new rear end. these pre built engines come with superchargers and cost about 8grand and give like 600 hp im sure you could get less hp for less money aswell.

Essentially if you wana use your current engine youl want a new cam, Forged internals will help prevent blowing up your engine under boost (which you will need) I personally like superchargers rather than turbo's they give a better sound, same amount of power with less work and less potential to explode and look cooler IMO turbos are for ricers. You will want an 8.8 rear end which isnt very expensive or hard to install, you will need a new clutch and or transmission, clutch at minimum though. Back to the engine, you will want to port and polish your heads, you will need a bigger TB and bigger gas pump. Trivial items will be needed aswell, plugs/wires, probably a better exhaust unless yours is already a dual. Im sure im forgetting all kinds of stuff, but essentially you need to completly rebuild your engine and drivetrain and suspension.
Well you can have a loud whining supercharger, and get blown away buy a turbo car... If thats what you want! Personally I would take fast over loud, besides have you ever heard a turbo spool? bov's make magical sounds...

And no turbo's will make MORE power than a supercharger.

And you don't "completely" need to rebuild anything to get 400hp... Shiner is on 100% stock suspension running 10s
 
#41 · (Edited)
i think you forgot the part where turbo's and superchargers do the same thing, if you have a supercharger putting 10lbs into the car or a turbo putting 10lbs into the car you are still getting 10lbs. and the fact remains that turbo's explode a hell of a lot more than supers do and supers cost less and are easier to install and still allow for LT headers. and yes ive owned turbo and supercharged cars before, i had a quad turbo skyline that literally exploded leading me to buy my mustang because i didnt have 15 grand to get a new engine for it.

And yeah you can run 400hp on stock suspension but if you wana do anything without ripping the axel off the bottom of the car you will want to upgrade it.

*edit* i just wanted to add for cool factor, that i blew the pistons right through the engine block in all directions, my mechanic mounted it on his wall :p
 
#42 ·
Nope I didn't forget anything, maybe you should learn the part where boost is only a measure of restriction. a turbo at 10psi will make more horsepower than a supercharger that makes 10psi. I've never seen a turbo "explode" , what are you talking about? You sound like one of those people who always say "NOS will make my engine explode" Buy the time you do a S/C and a set of long tubes (new prices here) you've got close to turbo prices and if you can install a SC and Long Tubes you can most likely install a turbo kit. Shiner's 600hp hasn't ripped his axle off the bottom yet and hes made multiple 10 second passes, all you need is an 8.8 so you don't brake the weak 7.5.

Quad turbo skyline? Are we talking Nissan like RB? R32,33,34? Just wondering how you quad turbo a car with 6 cylinders.