need some input

dpbbnc89 · May 2nd, 2009, 01:22 AM

I currently own an 03 automatic GT with 99k miles.
I'm relatively new to modding cars but my goal is to have a reliable street car that i'd also be able to take to the track. I'd imagine i want to be pushing around 450hp, and i'd want to know my motor could handle it safely, so would it be worth investing a ton of money into building a motor for a 2v, getting heads ported, supercharger, cams, all that.. or would it be a better idea to sell my car and wait for a 03-04 cobra to come along?

How much horsepower can you make from a 2v?

Lefty · May 2nd, 2009, 01:23 AM

Well it depends...do you want to have the fun of building your own 2V? Or would you rather just hold off for the Cobra? That's all up to you my friend

03SuperchargedGT · May 2nd, 2009, 01:26 AM

well most people will say it will be easier to just buy the cobra and go from there casue it will make good power will a pulley swap and a tune. but on the flip side look at jive(another member) he has a sick GT pushing over 600 to the wheels. so its up to you. our GT have potential if you have patience and money. Plus its always a surprise to see a fast ass GT. people suspect a cobra to be fast, but when a GT pulls up and kicks your ass its a nice surprise

casper gt · May 2nd, 2009, 01:41 AM

450 hp is a very lofty goal for someone who is both new to modding & wanting a reliable d/d. my advice would be to do gears, a converter, tune, exhaust, & some minor bolt ons & I bet you'll be pretty happy (for alot less money & have a much more reliable car). but if you insist on that much power you'll want to do a motor if you want to both race it & have it be reliable.

Gee · May 2nd, 2009, 01:45 AM

You can reach the 430-470 power range with a blower and a set of cams as long as you have a enuff fuel and a good tune.

Don't overlook the trans and a torque converter as it will make a night & day differance when stepping up H.P. You don't wanna burn out a high mileage stock tranny with the added mods.

Bush18 · May 2nd, 2009, 01:51 AM

buy a corvette lol

dpbbnc89 · May 2nd, 2009, 02:00 AM

I was planning on a shift kit, and one of my buddies told me something about getting the pressure increased in the lines for faster, firmer shifts? Would there be anything else i'd need for a stock tranny to keep it from breaking with that amount of hp?

What's the recommended stall? is 2700 good?

dpbbnc89 · May 2nd, 2009, 02:03 AM

Originally Posted by Bush18

buy a corvette lol

would only be able to afford an LS1

already had one of those and it had too many problems

casper gt · May 2nd, 2009, 02:06 AM

Originally Posted by dpbbnc89

I was planning on a shift kit, and one of my buddies told me something about getting the pressure increased in the lines for faster, firmer shifts? Would there be anything else i'd need for a stock tranny to keep it from breaking with that amount of hp?

What's the recommended stall? is 2700 good?

generally closer to 4000. if you were to get those kinda h/p #'s you'd still be good with a very minorly built 4r70w (the trans that's in your car) as they are very strong.

ajm · May 2nd, 2009, 02:51 AM

Originally Posted by dpbbnc89

I was planning on a shift kit, and one of my buddies told me something about getting the pressure increased in the lines for faster, firmer shifts? Would there be anything else i'd need for a stock tranny to keep it from breaking with that amount of hp?

What's the recommended stall? is 2700 good?

Theres a difference between a shift kit and increasing line pressure with a tuner. One simply gives you faster/firmer shifts by increasing line pressure. One gives you faster/firmer shifts yet supports weak features of the valve body. Which one you go with is up to you though.

2002 BLK GT · May 2nd, 2009, 05:23 AM

YouTube - Broadcast Yourself.

This should help...

Yep! Stock from the top to the bottom, minus shifter. Stock clutch, flywheel, and all that as well. I never had any clutch slip, or anything... Launched the car at 6200RPM drag racing on DOT slicks, no problems ever.

100% stock longblock. It was running 13psi - and was running out of fuel (needed a larger pump than single focus pump).

The stock block I believe, is capable of 700 bro so if you want more than that go for the cobra but as you can see with the money spent on the cobra the gt will be faster..

Eagle2000GT · May 2nd, 2009, 06:52 PM

450 hp (crank) shouldn't be a problem. For guys with manual transmissions that's around 380-390 rwhp. This is considered fairly safe for a daily driver. Because of the higher parasitic loss through an automatic transmission you would only see around 360 rwhp.

What do you need? An intercooled supercharger at 10 psi, a 75mm TB/Plenum and an off-road mid-pipe should get you pretty close.

Edit: The stock block is capable of 1000 hp. The stock rods and pistons are not.

2002 BLK GT · May 3rd, 2009, 01:50 AM

I thought the cobra block was only capable of that...?

Garhfer · May 3rd, 2009, 02:08 AM

Originally Posted by Big Daddys Stang

I thought the cobra block was only capable of that...?

The GT's have cast iron blocks the same as 03-04 Cobras do only difference is the heads and internals... etc...

2002 BLK GT · May 3rd, 2009, 02:09 AM

I see now..

Exodus · May 3rd, 2009, 03:12 AM

GT Mustang..........10k
Supercharger...........5k
the ear to ear smile accross a the face of whoever is in the passenger seat.............priceless

oh and did I mention the other 10k thats still in your bank because you didnt buy a snake

dpbbnc89 · May 3rd, 2009, 03:20 AM

whats the hp limit for the stock internals?

Garhfer · May 3rd, 2009, 03:31 AM

Originally Posted by dpbbnc89

whats the hp limit for the stock internals?

450 rwhp is borderlining the limit of the rods so you might as well swap everything out for forged internals if you want to stay at that power range or above... and seeing as you have 99k miles already on the clock who knows how much more stress the stock internals you have can take.

Eagle2000GT · May 3rd, 2009, 08:45 AM

I've seen several posts where motors came apart after a few weeks at 420 rwhp and I've read posts where they've lasted a couple of years at that power. The difference is in the other supporting mods such as cams, heads, etc. Some have even pushed the stock internals further but they had all of the supporting mod available.

I believe that all of them were manual transmissions. You have to remember for an automatic that it takes a lot more horsepower at the crank than for a manual transmission to make the same horsepower at the wheels and if you use rwhp as a measuring stick you will be pushing your motor a lot farther than they did. The same horsepower at the block results in 30-35 less horsepower at the wheels for an automatic. If you want to go much beyond 360-380 rwhp you should probably rebuild the motor with forged rods and pistons.

450 rwhp takes a lot more money than 450 hp. 600 rwhp is possible in a 2v. It just takes money.

P.S. Just because automatics put down less at the wheels doesn't necessarily make them slower. With a shift kit automatics are just as fast and they never miss a shift.

00GT5spd · May 3rd, 2009, 04:42 PM

so you would be good sticking right around 400rwhp and not have to change much? wich would be what.. 455hp

May 2nd, 2009, 01:22 AM	#1
dpbbnc89 Regular 2003 Mustang GT Join Date: May 2009 Location: Concord, NC Posts: 57 iTrader: 3 reviews	need some input I currently own an 03 automatic GT with 99k miles. I'm relatively new to modding cars but my goal is to have a reliable street car that i'd also be able to take to the track. I'd imagine i want to be pushing around 450hp, and i'd want to know my motor could handle it safely, so would it be worth investing a ton of money into building a motor for a 2v, getting heads ported, supercharger, cams, all that.. or would it be a better idea to sell my car and wait for a 03-04 cobra to come along? How much horsepower can you make from a 2v?

May 2nd, 2009, 01:23 AM	#2
Lefty The Doctor '01 Cobra Vert. Join Date: Jun 2007 Location: Mechanicsburg, PA Posts: 27,386 iTrader: 11 reviews	Well it depends...do you want to have the fun of building your own 2V? Or would you rather just hold off for the Cobra? That's all up to you my friend __________________ 2008 Acura TL Type-S (the daily) 2006 Yamaha R6 50th Anniversary Edition (the other toy)

May 2nd, 2009, 01:26 AM	#3
03SuperchargedGT Enthusiast 2008 Cadillac CTS4 Join Date: Jul 2008 Location: Vancouver,BC Posts: 720 iTrader: 0 reviews	well most people will say it will be easier to just buy the cobra and go from there casue it will make good power will a pulley swap and a tune. but on the flip side look at jive(another member) he has a sick GT pushing over 600 to the wheels. so its up to you. our GT have potential if you have patience and money. Plus its always a surprise to see a fast ass GT. people suspect a cobra to be fast, but when a GT pulls up and kicks your ass its a nice surprise __________________ 2003 Mustang GT See Garage for mod list....360RWHP,360RWTQ....SOLD 2008 Cadillac CTS4

May 2nd, 2009, 01:41 AM	#4
casper gt Moderator 2010 mustang gt auto Join Date: Mar 2008 Location: creighton pa Posts: 7,470 iTrader: 3 reviews	450 hp is a very lofty goal for someone who is both new to modding & wanting a reliable d/d. my advice would be to do gears, a converter, tune, exhaust, & some minor bolt ons & I bet you'll be pretty happy (for alot less money & have a much more reliable car). but if you insist on that much power you'll want to do a motor if you want to both race it & have it be reliable. __________________ MM BRACKET RACING CREW CO-FOUNDER BAMA Performance Drag Team Founder 2010 GT auto

May 2nd, 2009, 06:52 PM	#12
Eagle2000GT MM Fanatic 2000 Mustang GT 12.73@111.36 Join Date: Aug 2007 Location: Shelbyville, IN Posts: 4,733 iTrader: 1 reviews	450 hp (crank) shouldn't be a problem. For guys with manual transmissions that's around 380-390 rwhp. This is considered fairly safe for a daily driver. Because of the higher parasitic loss through an automatic transmission you would only see around 360 rwhp. What do you need? An intercooled supercharger at 10 psi, a 75mm TB/Plenum and an off-road mid-pipe should get you pretty close. Edit: The stock block is capable of 1000 hp. The stock rods and pistons are not. __________________ ProCharger P-1SC, 9 psi, STD 396/383; Uncorrected 388/375; SAE 383/370 Mods list in Garage. Last edited by Eagle2000GT; May 2nd, 2009 at 06:54 PM.

May 2nd, 2009, 01:45 AM	#5
Gee Regular Super Stang never quick enuff Join Date: Dec 2008 Location: Indy Posts: 215 iTrader: 4 reviews	You can reach the 430-470 power range with a blower and a set of cams as long as you have a enuff fuel and a good tune. Don't overlook the trans and a torque converter as it will make a night & day differance when stepping up H.P. You don't wanna burn out a high mileage stock tranny with the added mods.

May 2nd, 2009, 01:51 AM	#6
Bush18 Regular 2000 Mustang GT Join Date: Jan 2009 Posts: 191 Blog Entries: 1 iTrader: 0 reviews	buy a corvette lol

May 2nd, 2009, 02:00 AM	#7
dpbbnc89 Regular 2003 Mustang GT Join Date: May 2009 Location: Concord, NC Posts: 57 iTrader: 3 reviews	I was planning on a shift kit, and one of my buddies told me something about getting the pressure increased in the lines for faster, firmer shifts? Would there be anything else i'd need for a stock tranny to keep it from breaking with that amount of hp? What's the recommended stall? is 2700 good?

May 3rd, 2009, 01:50 AM	#13
2002 BLK GT Hardcore Enthusiast 4.6L Coupe' 5spd *************** Join Date: Apr 2009 Location: S. California Posts: 2,185 iTrader: 0 reviews	I thought the cobra block was only capable of that...?

May 3rd, 2009, 02:09 AM	#15
2002 BLK GT Hardcore Enthusiast 4.6L Coupe' 5spd *************** Join Date: Apr 2009 Location: S. California Posts: 2,185 iTrader: 0 reviews	I see now..

May 3rd, 2009, 03:12 AM	#16
Exodus Regular 02 mineral grey GT SORC 29 miles 13 mins 14 secs Join Date: Aug 2008 Location: Nebraska Posts: 411 iTrader: 0 reviews	GT Mustang..........10k Supercharger...........5k the ear to ear smile accross a the face of whoever is in the passenger seat.............priceless oh and did I mention the other 10k thats still in your bank because you didnt buy a snake __________________

May 3rd, 2009, 03:20 AM	#17
dpbbnc89 Regular 2003 Mustang GT Join Date: May 2009 Location: Concord, NC Posts: 57 iTrader: 3 reviews	whats the hp limit for the stock internals?

May 3rd, 2009, 08:45 AM	#19
Eagle2000GT MM Fanatic 2000 Mustang GT 12.73@111.36 Join Date: Aug 2007 Location: Shelbyville, IN Posts: 4,733 iTrader: 1 reviews	I've seen several posts where motors came apart after a few weeks at 420 rwhp and I've read posts where they've lasted a couple of years at that power. The difference is in the other supporting mods such as cams, heads, etc. Some have even pushed the stock internals further but they had all of the supporting mod available. I believe that all of them were manual transmissions. You have to remember for an automatic that it takes a lot more horsepower at the crank than for a manual transmission to make the same horsepower at the wheels and if you use rwhp as a measuring stick you will be pushing your motor a lot farther than they did. The same horsepower at the block results in 30-35 less horsepower at the wheels for an automatic. If you want to go much beyond 360-380 rwhp you should probably rebuild the motor with forged rods and pistons. 450 rwhp takes a lot more money than 450 hp. 600 rwhp is possible in a 2v. It just takes money. P.S. Just because automatics put down less at the wheels doesn't necessarily make them slower. With a shift kit automatics are just as fast and they never miss a shift. __________________ ProCharger P-1SC, 9 psi, STD 396/383; Uncorrected 388/375; SAE 383/370 Mods list in Garage. Last edited by Eagle2000GT; May 3rd, 2009 at 08:49 AM.

May 3rd, 2009, 04:42 PM	#20
00GT5spd Enthusiast 2000 Mustang GT 258.7 RWHP 301.1 RWTQ Join Date: May 2009 Location: Burton MI Posts: 731 iTrader: 0 reviews	so you would be good sticking right around 400rwhp and not have to change much? wich would be what.. 455hp __________________ 2000 Mustang GT 2009 Kawasaki Ninja 250R (For Sale) 2002 Yamaha yzf R6

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