Hi, I was wondering how much my total hp would be on my 03 Gt with these mods... K&N air filter, C&L plenum, Accufab 75 tb, 3.73 gears, steeda tri-ax shifter, steeda underdrive pulleys, intake spacer, bassani x-pipe. My mustang now has 248 at the wheels how much will it be after these are installed at the wheels? Should I replace stock springs with eibch drag springs? Thanks

 

On a bone stock car, if you added those mods the increase in hp would be:

K&N: 3 - 5
C&L w/ 75 TB: 14 hp
3.73: -3 hp
Tri-Ax Shifter: 0 hp
UPD's: 8 hp
Intake Spacer: Waste of time...not needed with the plenum
X-Pipe: 10 - 15hp

A stock GT 5 speed has 225 hp, so these mods would give you about 40 hp tops for a total of about 260 rwhp. However, in reality expect about 245 - 250 hp.

Your value of 248 hp is simply not possible on your car w/o those mods unless you have added heads or cams or something significant.

If you look at my mods which are all of the above PLUS a high flow catback, CAI, and an SCT tune - I am lucky if I have 265 rwhp.

You will loose rwhp with gears, but don't loose any sleep over it. It is really an effect of how the dyno works with a gear ratio in 4th that is no longer 1:1. It is really not a hp loss, but rather a limitation of a dyno.

 

In muscle mustangs and fast ford magazine they tested a new stock 03 Gt on the dyno and got 246 hp at the wheels i don't know what ya'll are sayin cause stock is 246 ON THE DYNO! Not 225!!!!

 

They are smoking crack. If they did, then they found the fasted stock GT on the planet.

I have seen a few dozen dyno results on stock GT's and those with various bolt-ons. The accepted value for a stock GT in mustang circles is 225-228. Keep in mind that there are many factors that determine dyno results such as altitude and air quality, so if they did not compensate correctly you will get different numbers.

At the end of the day, HP does not matter much. It's all about how quickly the car gets down the track.

If you did all the mods that you listed above, you might be looking at 245 rwhp.

 

Yea there is no way a bone STOCK gt made 248 at the wheels. Those mods that you have listed MIGHT get you to that point.

 

You mean to tell me the shifter didnt add any hp since its made from light weight material

 

Sorry, no hp gain there. But if you got one of those Tornado things you would see an easy 75hp gain, haha

 

How about and electric supercharger "Turdonator"

 

Oh that is a good 95hp right there I have 4 of them in my car.

 

Blue, I hope ya don't feel like everyone is busting on ya. When I first got involved with stangs, I put up in a thread that I was gonna add some mods and then stated that the car would have 325 hp at the flywheel when it would only be more like 280.

 

BTW, I have a friend with an '02 GT Automatic. Car has the normal bolt-ons such as exhaust, plenum, TB, TA, and UDP's. Car dynos at 245 HP but runs the 1/4 mile in 13.05. He has 150 passes on the car this season. The best mod is practice and the right set of wheels and tires don't hurt either.

 

MT, I have a 02 5spd and am lookin for times like this maybe even 12.90's. Do you think this is possible with boltons? Currently flowmaster mufflers, 2 cats removed, udp, mac straight shot cold air, steeda timing adjuster +2 dregees.Plenum and TB, x pipe and maybe 3.73's next.As money comes in. Any help would be great as i am new to these 4.6 cars.
Thanks,
Scott

 

What do you currently run in the 1/4? Are you going with a offroad X pipe? If you don't have emissions then go with an o/r X pipe, you wouldn't imagine how much our stock H pipe weighs, so you would be loosing some weight also. The best thing that will help you get those times are practice shifting, and get some sticky tires. It is possible to hit 13's with bolt ons. Practice with your launches and get some gears and have fun.

 

Have not run the car on the track yet.I will be going with a o/r X pipe for sure. I'm not sure what brand yet as i may be going with L/T headers in the future, so I only want to buy one X pipe.I'm lookin at Hooker, MAC, and SLP. Also the MT X pipe is lookin good.

 

Well if you go with the SLP you can stay with cats and then when you want lt's, you can go with the long tubes and keep the same X pipe, which is a great feature. And it's all stainless steel

 

FEW THINGS:

1 - Practise
2 - Loose weight
3 - Suspension mods (helps get the weight transfered correctly and the power to the road)

You will need to get your 60 foot under 1.8 and drop a few lbs off the car. Also, track altitude makes a big difference. Hitting 13.0 is very possible especially if the times are corrected to sea level. Know this, there are plenty of guys with just bolt-ons (no cams or heads) breaking into the 12's.

I type more later when I have the time.

 

Thanks, I look forward to reading more. You guys are a big HELP.

 

If you really want to get into drag racing, then I would start by loosing the back seats unless you use them, as well as other weight reduction things like removing the spare tire, jack. Get some pounds off that heavy car. You will loose a good 30lbs just by going with an o/r pipe rather than the stock H pipe. I would say with the cats and all, it is a good 50lbs. Get you a new shifter also with the mods.

Also how do you like the MAC straight shot? I have been looking at that for about a month now. Also any pics? And how hard was it to install? I have heard it was a tight fit.

 

A 99-04 5sp GT makes 260 at the flywheel...I assume you're talking 225 RWHP?

 

I think you are correct, no need in doing Flywheel HP estimates IMO.

 

Yea, that was a typo guys. Thanks!

Stock GT's do 260 fwhp and about 225 rwhp.

 

Here is a great thread to read that should help you out!

http://forums.modulardepot.com/showt...&threadid=1877

 

All dynos will read different to some degree my gt when only cold air intake, x pipe, and catback were done only pulled 221 at the wheels on a hot humid day but the same setup was around 10 higher a few weeks later on a cool day btw its a five speed car and pull was done on mustang dynomometer

 

I have an 02 automatic with the following mod's.
Steeda pullies
Steeda timing adjuster set at 14 (93 octane)
Steeda X pipe with cats
Steeda catback
C & L plenum and Accufab 75mm throttle body
C & L tru flow inlet pipe, stock air box w/K & N
I dynoed this spring at 243 hp 280 tq.
Stock is around 210-214 for an automatic.

I run consistant 13.2's @ 102 mph.
Best of 13.05 @ 103.82

I am Blake's buddy he referred to earlier in this thread.
I have put 138 passes on the car this year. The best mod's I made were practice and alot of listening to guy's who have been there done that. The only power mod I added this season were pullies, 5 hp at best. Yet I went from 14.323 down to 13.05. I concentrated on making the most of the power I already had. I put on upper and lower control arms, drag struts, 4.30 gears, a 3500 stall speed converter and drag radials. With a few tweaks and good weather I will run 12.7's to 12.8's next April.
My car is a daily driver and my goal is low 12's through an automatic daily driver without a power adder, and I will get there unless of course I run out of money first.