I CURRENTLY HAVE A 2003 GT AND I AM SUPRISED AT THE FACT THAT IT SEEMS HARD TO BOLT ON HORSEPOWER. I HAD A 91 GT AND THERE WAS A WHOLE BUNCH OF STUFF YOU COULD DO TO IT. THERE ARE NO GT-40 INTAKES OR HEADS YOU CAN PUT ON THE 2003, SO I AM BUMMED OUT. I RESCENTLY PUT A STEEDA COLD AIR INTAKE, EIBACH PRO KIT LOWERING SPRINGS, BF GOODRICH G-FORCE KDW TIRES, 3:55 GEARS, BBK 2 CAT X-PIPE, AND FLOWMASTER AMERICAN THUNDER EXHAUST KIT ON. BUT AFTER LOOKING FOR MY NEXT PURCHASE, I FOUND THAT THERE IS NOT MUCH ELSE OUT THERE OTHER THAN A SUPERCHARGER. YEAH THERE ARE EASY BOLT ONS LIKE PULLYS, BUT THEY DONT INCREASE HP, THEY JUST DISTRIBUTE POWER DIFFERENTLY. I WANT TO GET MY CAR TO ABOUT 350 HP, BUT I DONT KNOW WHAT ELSE IS OUT THERE. TRICK FLOW MAKES A HIGH FLOW UPPER PLENUM http://www.trickflow.com/product/man...per_plenum.asp
BUT I DONT KNOW WHAT ELSE IS OUT THERE THAT CAN ADD SIGNIFICANT HP TO MY RIDE? ANYONE KNOW HOW I CAN GET 350HP OR MORE WITHOUT A SUPERCHARGER?
Dont you have the option to change cams? add a chip? isnt there a high flow intake available from Steeda as well as larger throttle body's and MAF? And why not add the pulleys? They will free up a few ponies.
just a couple of things to note here. on my 1991 gt, i ran a 14.3 at the track and after i added the ford motorsport e 303 cam, i ran slower. as far as pulleys go, i had ford motorsport pulleys on my 1991 and they worked fine, except for my amps would drop drastically at idle, and with a sound system, i went through a few batteries and alternators a year. i know that there is a power and amp pulley set that march and probably a few others had set out, but i feel that something else will be compromised if my amps arent. the intake from steeda might be the one i have been seeing out there which is the improved intake that the 2002-2004's came with. my next upgrade will be in one week when i send my oem chip to steeda for them to calibrate it for my improved intake/exhaust and 3:55 gears i just had put on. with all that you described earlier, i still dont think that will add up to 350hp. what else is there that might be a little bit more expensive but will add some significant hp?
what good would an aftermarket maf do over the stock one? just curious because i have never messed with that. are they just larger? with a maf improvement and a 70mm throttle body, and possibly a dragon plenum.........would that allow for larger fuel injectors?
what good would an aftermarket maf do over the stock one? just curious because i have never messed with that. are they just larger? with a maf improvement and a 70mm throttle body, and possibly a dragon plenum.........would that allow for larger fuel injectors?
The maf will do nothing.
If you want 350 at the crank you need to forget about the mafs, cold air kits and other worthless bolt ons and start with a good exhaust consisting of long tubes and a quality mid pipe. Then put cams and probably some sort of ported heads on it. Then take it and have it DYNO tuned not mail order steeda crap. Youll spend about the same money and get better results.
If you want 350 to the wheels plan on a serious amount of cash, a dam good engine builder and alot of luck.
Improved intake from steeda? If your talking about the whole manifold you already have the same exact thing. You can go to a bullitt or a fox lake P51 and gain some power.
There are many many people out there with that power and its all in the heads and cams.
The motor responds to bolt-ons as well as any other. The EASY bolt-on is a supercharger; a standard Vortech V2 SQ1 should make around 330-340rwhp, properly tuned, on a late GT. If you go for intercooled setup, car should do 380-390rwhp, again, properly tuned. If desire to stay N/A, a quality set of CNC-ported heads & aftermarket cams, coupled w/normal exhaust/intake mods should get you close to 300rwhp and up the grin factor. Explore Fox Lake Racing or VT Engines. Fox Lake's P-51 intake seems to be making good HP as well.
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I'm back - 2002 GT Convertible, auto: Continental Extreme Contacts, KYB GR-2 shocks/struts, Ford Racing "G" springs, Maximum Motorsports camber plates, 3 pc grill delete, Mach I chin spoiler.
The list to get the most naturally aspirated power from a 4.6 is long and expensive. The logical choice is to cut the gordian knot and go directly to a blower install, but...
1. Have heads cnc ported. Fox Lake will do them both for $750. Maybe 25hp
2. Comp cams (270h maybe) $750 plus lots of labor $1200 or so. Maybe 30hp
3. Exhaust . X pipe (bassani my fav. - w/cats if you need to get checked out each year, long tube headers, then after cat system. SLP is loud but good quality. $2000 or more.
Maybe 20hp
4. Tuneable Cold Air Intake system. DeMolet my pick. $150 appx. Maybe 5hp
5. Accufab throttle body and C&L intake plenum or if money no object, new P51 item from Fox Lake ($1500) Maybe 12hp
6. Steeda or March underdrive pulleys (less water pump pulley if....) $150 Maybe 7hp
7. Electric water pump with idler pulley $350 plus labor Maybe 5hp
8. SCT X-Calibrator tune for premium fuel $400 plus dyno time Maybe 6hp
By this time you're probably close the limit for your fuel injectors (set of 24# units will set you back $200 plus labor), and your Mass Air sensor will need adjustment or replacement when you change the injectors.
All this will get you close to 350hp at the flywheel (some of these estimated "gains" usually overlap/conflict...), probably under 300 at the rear wheel with a 5 speed and strong clutch... If you mean 350rwhp, you're looking at a rebuild on the block with forged internals and stroke to 5.0 or so ($4000+++).
We're all waiting for the good heads. But as joemoe once said, "There's no replacement for displacement." A 4.6 naturally has less room to grow than a rather under-utilized stock '91 5.0, and most of the changes are pricey at best.
There's a reason so many people are using power-adders rather than na part swaps on these cars, and there's a reason there are relatively few aftermarket alternatives (though this will change as more of these cars enter the "overhaul" mileage range). To get 350 cubic inch power out of a 281 cubic inch engine costs lots of dollars and is relatively hard.
tripleblack
Quote:
Originally Posted by outcry
I CURRENTLY HAVE A 2003 GT AND I AM SUPRISED AT THE FACT THAT IT SEEMS HARD TO BOLT ON HORSEPOWER. I HAD A 91 GT AND THERE WAS A WHOLE BUNCH OF STUFF YOU COULD DO TO IT. THERE ARE NO GT-40 INTAKES OR HEADS YOU CAN PUT ON THE 2003, SO I AM BUMMED OUT. I RESCENTLY PUT A STEEDA COLD AIR INTAKE, EIBACH PRO KIT LOWERING SPRINGS, BF GOODRICH G-FORCE KDW TIRES, 3:55 GEARS, BBK 2 CAT X-PIPE, AND FLOWMASTER AMERICAN THUNDER EXHAUST KIT ON. BUT AFTER LOOKING FOR MY NEXT PURCHASE, I FOUND THAT THERE IS NOT MUCH ELSE OUT THERE OTHER THAN A SUPERCHARGER. YEAH THERE ARE EASY BOLT ONS LIKE PULLYS, BUT THEY DONT INCREASE HP, THEY JUST DISTRIBUTE POWER DIFFERENTLY. I WANT TO GET MY CAR TO ABOUT 350 HP, BUT I DONT KNOW WHAT ELSE IS OUT THERE. TRICK FLOW MAKES A HIGH FLOW UPPER PLENUM http://www.trickflow.com/product/man...per_plenum.asp
BUT I DONT KNOW WHAT ELSE IS OUT THERE THAT CAN ADD SIGNIFICANT HP TO MY RIDE? ANYONE KNOW HOW I CAN GET 350HP OR MORE WITHOUT A SUPERCHARGER?
The list to get the most naturally aspirated power from a 4.6 is long and expensive. The logical choice is to cut the gordian knot and go directly to a blower install, but...
1. Have heads cnc ported. Fox Lake will do them both for $750. Maybe 25hp
2. Comp cams (270h maybe) $750 plus lots of labor $1200 or so. Maybe 30hp
3. Exhaust . X pipe (bassani my fav. - w/cats if you need to get checked out each year, long tube headers, then after cat system. SLP is loud but good quality. $2000 or more.
Maybe 20hp
4. Tuneable Cold Air Intake system. DeMolet my pick. $150 appx. Maybe 5hp
5. Accufab throttle body and C&L intake plenum or if money no object, new P51 item from Fox Lake ($1500) Maybe 12hp
6. Steeda or March underdrive pulleys (less water pump pulley if....) $150 Maybe 7hp
7. Electric water pump with idler pulley $350 plus labor Maybe 5hp
8. SCT X-Calibrator tune for premium fuel $400 plus dyno time Maybe 6hp
ok....it turns out that steeda has an improved intake and heads that i can bolt on. after looking at foxlake, i can save some cash by sending them my heads and having them work on them. their intake looks cool and brings in more air. so now i am torn between these two. steeda quotes a 35 hp increase as soon as you bolt on these heads, but they will only fit with the improved intake. 70hp is quoted with these two together. over 60 hp is quoted by foxlake with their cnc heads and p-51 intake. i just got off the phone with a rep from steeda. he says the heads and intake are improved over what i have now, but what bothers me is he said "you might not notice a difference right away, but after you add a cam you will". for the money i am about to spend on this project.......i want to smile as soon as i start the car. i know that these two(heads and intake) will get me closer to 350 rwhp, but i am not sure which ones are the better buy. does anyone have heads that were cnc'd by foxlake? does anyone use the p-51? also, with foxlake i would spend abut $2300 bucks as opposed to steedas products that will run about $3400.
If you want 350 at the crank you need to forget about the mafs, cold air kits and other worthless bolt ons and start with a good exhaust consisting of long tubes and a quality mid pipe. Then put cams and probably some sort of ported heads on it. Then take it and have it DYNO tuned not mail order steeda crap. Youll spend about the same money and get better results.
If you want 350 to the wheels plan on a serious amount of cash, a dam good engine builder and alot of luck.
Improved intake from steeda? If your talking about the whole manifold you already have the same exact thing. You can go to a bullitt or a fox lake P51 and gain some power.
There are many many people out there with that power and its all in the heads and cams.
The MAF by itself wont do anything but it will with the right supporting parts as it does with any other Mustang. He does not have "the same exact thing" its a totally different intake and the Bullit will not fit his car, it fits 99-02 his is 03.
The MAF by itself wont do anything but it will with the right supporting parts as it does with any other Mustang. He does not have "the same exact thing" its a totally different intake and the Bullit will not fit his car, it fits 99-02 his is 03.
No the MAF is not a power mod. The sole and only reason to change it is if you peg the output voltage at 4.86V which you will not do N/A.
Origionally I thought they were selling a plastic PI intake which he has. I did look and it is infact a bullitt.
The bullitt intake fits ALL 99+ PI headed cars. The only difference in the heads on 4.6 and 5.4's from 99 to 04 is the number of bolts holding the valve covers on. The 99-02 statement from steeda is a misprint.
No the MAF is not a power mod. The sole and only reason to change it is if you peg the output voltage at 4.86V which you will not do N/A.
Origionally I thought they were selling a plastic PI intake which he has. I did look and it is infact a bullitt.
The bullitt intake fits ALL 99+ PI headed cars. The only difference in the heads on 4.6 and 5.4's from 99 to 04 is the number of bolts holding the valve covers on. The 99-02 statement from steeda is a misprint.
At no point have I said that its a power mod, but it does aid to make more power supporting other mods. I dont understand your reasoning behind "The sole and only reason to change it is if you peg the output voltage at 4.86V" If you change to larger fuel injectors, a manifold that will accept a larger throttle body and a larger throttle body, than it stands that a larger MAF calibrated to the injector size will help.
The intake were talking about is not a Bullit (yes its on their site but it isnt the one were talking about) If you go to Steeda and click on fuel and induction its the first manifold kit. the "4.6L GT High-Flow Intake Kit: 96-04" to be exact. Its possible that Steeda has a misprint, only one way to find out.
At no point have I said that its a power mod, but it does aid to make more power supporting other mods. I dont understand your reasoning behind "The sole and only reason to change it is if you peg the output voltage at 4.86V" If you change to larger fuel injectors, a manifold that will accept a larger throttle body and a larger throttle body, than it stands that a larger MAF calibrated to the injector size will help.
What your thinking and what actually happens are two completely different things. The stock MAF allows more air to flow through it than the engine actually uses so its not a restriction. You do not need to calibrate a MAF to injectors, instead that is done in the tune. You rescale the displacement and transfer function to reflect the larger injectors.
The intake were talking about is not a Bullit (yes its on their site but it isnt the one were talking about) If you go to Steeda and click on fuel and induction its the first manifold kit. the "4.6L GT High-Flow Intake Kit: 96-04" to be exact. Its possible that Steeda has a misprint, only one way to find out.
Ok that is the SVO intake and it origionally came out for the 96-68 cars. That is designed for NPI intake ports specifically for the SVO heads. A ported SVO head will outflow any CNC Pi head out there. The problems he will have with that intake is it will have to be port matched to the heads and the SVO head have an open chamber whereas his are closed this will drop compression because the piston dish on his is bigger than the NPI motors. And the bullitt is basically the same thing but with PI shaped flanges.
I work part time at a dyno shop and I have yet to see one single N/A 4.6 2V come in and make more power at the same A/F ratio and timing with a bigger MAF. Usually youi can hardly tune them without taking the crap maf and cai off.
so with intake, heads and cam........which is better for the money? steeda racing heads, improved intake, and cam? or foxlakes cnc heads and intake and cam? foxlake seems to be a lot cheaper, but steeda advertised 70hp with the two pieces alone (intake and heads)
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"rollin......in my five point O.........put my rag top down so my hair can blow!"
How Do I Get To 350hp? 
