need some basic information

03SuperchargedGT · July 10th, 2008, 11:51 PM

Hey everyone im new to this forum, and ive got a couple questions. First off i drive a 2003 mustang GT thats automatic and Vortech supercharged with flowmasters and bbk off-road x pipe and 3:73 gears. My questions is what is the most RWHP my engine and tranny can take? My next question is if i change the pully to a 3.40" and add the accufab plenum/throttle body combo, as well as some bbk shortys can i hit the 400RWHP mark and will the car hold up. my goal is 400RWHP.Thanks for your input

BLK01SS · July 10th, 2008, 11:53 PM

I think just around 400 is what a stock driveline will hold as for the pully Im not sure

03SuperchargedGT · July 10th, 2008, 11:57 PM

ok well thanks i appreciate the response

Abe02GT · July 10th, 2008, 11:58 PM

400 maybe a little extra before stuff starts shittin the bed.

SWEET2KSTANG · July 11th, 2008, 12:45 AM

if clutched correctly, it will hold more than 400. if you overclutch it you will do what i did on mine. the motor will hold low 400's tuned correctly, it can hold more if the motor is and has been properly maintained and the tune is spot on.

MeZ · July 11th, 2008, 12:50 AM

If you're intercooled, 400 is fine as long as you know how to drive the car, but I'd keep it under 400 ...

SWEET2KSTANG · July 11th, 2008, 12:55 AM

nothing wrong at all going past 400 if the car is tuned correctly.

MeZ · July 11th, 2008, 01:10 AM

It just becomes ALOT more likely that you're gonna end up with a thread titled:

Motor Blew: Time for a rebuild, where do I start ?

Better to be safe than sorry, even with the safest tunes ... once you eclipse that 400-425 rwhp mark .. you're just asking for it

SWEET2KSTANG · July 11th, 2008, 01:20 AM

how do you figure???

MeZ · July 11th, 2008, 01:47 AM

because I've seen it happen time and time again, these cars are unpredictable even on good tunes, I've seen some gt's handle 450 rwhp for years and I've seen some blow on 400 rwhp after a few months .. these comming from the same tuners etc .. granted in general .. 400 rwhp on with a good tune should carry you a ways .. you never know with these cars .. esp on turbo apps, but this concerning a centri blower .. I've seen rods go numerous times

jaxdawg · July 11th, 2008, 02:13 AM

but aren't you around 400-425hp anyway if you have a manual tans and a blower? and maybe a few supporting mods

SWEET2KSTANG · July 11th, 2008, 02:37 AM

if a vehicle is properly maintained, there is no reason it should have any trouble with 425 and a good tune.

MeZ · July 11th, 2008, 02:42 AM

Originally Posted by jaxdawg

but aren't you around 400-425hp anyway if you have a manual tans and a blower? and maybe a few supporting mods

A good intercooler, Small pulley with Long Tubes, and a good tune you're 400 easy ..

MeZ · July 11th, 2008, 02:43 AM

Originally Posted by SWEET2KSTANG

if a vehicle is properly maintained, there is no reason it should have any trouble with 425 and a good tune.

Yet it happens all the time ..

jaxdawg · July 11th, 2008, 03:16 AM

i have an automatic right now but i'm bout to put a t-56 in soon hopefully. i made 350hp with the auto, i'll see what i'll make with the manual

SWEET2KSTANG · July 11th, 2008, 04:33 AM

Originally Posted by MeZ

Yet it happens all the time ..

yet it doesnt

dude496 · July 11th, 2008, 05:07 AM

wow, there is no way at all to argue either side of this. Some will hold strong, some will blow...thats just how it is. Seen some last for a long time and others blow really early. I honestly don't like the stock 4.6 bottom end, its pretty much garbage imo.

I will say this much though...400 whp through an auto is asking for troubles. Drivetrain loss through an auto is around 20% vs drivetrain loss of a manual that is around 12%. In otherwords (lets say 10% manual 20% auto just for easy numbers)...400 whp in a manual is about 440 crank hp but on a manual 400 whp is 480 crank hp....see where i am going with that?

SWEET2KSTANG · July 11th, 2008, 07:27 AM

the drivetrain loss in a manual i a little more than that. manuals are roughly 15-17% loss. we are talking rwhp #"s, not fly #'s. if headwork is done, that will allow more as well. VE of a head is a key in making power, especially with the 2v set up. that is also where supporting mods and tuning is the key. i am not saying that these will not blow at 400, buit if ecerything is done correctly then it will hold beyond that. the condition of the motor is a key factor as well.

03SuperchargedGT · July 11th, 2008, 12:25 PM

thanks for all the information so basically it would be smart on my part to keep it aorund 350-370 RWHP. keeping in mind all internals and bottom end is stock except for gears

Eagle2000GT · July 11th, 2008, 08:22 PM

I've worked with two tuners and talked to several others. The word I get from them is that if your car is a daily driver you shouldn't go higher than 370-380 rwhp. Every one of them knows of a car running 420 that has lasted a couple of years. I was also told that they've seen motors blow on the dyno at 350. It just depends on the motor.

July 10th, 2008, 11:51 PM	#1
03SuperchargedGT Enthusiast 2008 Cadillac CTS4 Join Date: Jul 2008 Location: Vancouver,BC Posts: 717 iTrader: 0 reviews	need some basic information Hey everyone im new to this forum, and ive got a couple questions. First off i drive a 2003 mustang GT thats automatic and Vortech supercharged with flowmasters and bbk off-road x pipe and 3:73 gears. My questions is what is the most RWHP my engine and tranny can take? My next question is if i change the pully to a 3.40" and add the accufab plenum/throttle body combo, as well as some bbk shortys can i hit the 400RWHP mark and will the car hold up. my goal is 400RWHP.Thanks for your input

July 10th, 2008, 11:58 PM	#4
Abe02GT Enthusiast 2002 Mustang GT Join Date: Apr 2008 Location: San Diego Posts: 506 iTrader: 0 reviews	400 maybe a little extra before stuff starts shittin the bed. __________________ Check my garage for pics and mods! Originally Posted by svtkidd23 *if my gears were a vagina.. id beat it up!*

July 11th, 2008, 12:45 AM	#5
SWEET2KSTANG mm's nitrous mod 2000 mustang gt 11.79@115.83 (old set up) Join Date: Oct 2006 Location: N.W. AR Posts: 12,541 iTrader: 8 reviews	if clutched correctly, it will hold more than 400. if you overclutch it you will do what i did on mine. the motor will hold low 400's tuned correctly, it can hold more if the motor is and has been properly maintained and the tune is spot on. __________________ project warhorse under construction wagon burner under construction as well (04 lightning) being built by MP2 Performance

July 11th, 2008, 12:50 AM	#6
MeZ Enthusiast 2004 Mustang GT Join Date: Mar 2007 Location: Concord, North Carolina Posts: 966 iTrader: 0 reviews	If you're intercooled, 400 is fine as long as you know how to drive the car, but I'd keep it under 400 ... __________________ Car For Sale on Autotrader.com 04 Silver GT 32K Miles Parts 4 Sale: 18" Wheels SSR GT3 replicas w/ tires Steeda Tri-Ax 10lb N20 Bottle w. gauge (2) Kirkey Racing Seats w/ RCI 5 Pt. belts Steeda & Momo shift knobs SB GT Spoiler

July 11th, 2008, 12:55 AM	#7
SWEET2KSTANG mm's nitrous mod 2000 mustang gt 11.79@115.83 (old set up) Join Date: Oct 2006 Location: N.W. AR Posts: 12,541 iTrader: 8 reviews	nothing wrong at all going past 400 if the car is tuned correctly. __________________ project warhorse under construction wagon burner under construction as well (04 lightning) being built by MP2 Performance

July 10th, 2008, 11:57 PM	#3
03SuperchargedGT Enthusiast 2008 Cadillac CTS4 Join Date: Jul 2008 Location: Vancouver,BC Posts: 717 iTrader: 0 reviews	ok well thanks i appreciate the response

July 11th, 2008, 01:10 AM	#8
MeZ Enthusiast 2004 Mustang GT Join Date: Mar 2007 Location: Concord, North Carolina Posts: 966 iTrader: 0 reviews	It just becomes ALOT more likely that you're gonna end up with a thread titled: Motor Blew: Time for a rebuild, where do I start ? Better to be safe than sorry, even with the safest tunes ... once you eclipse that 400-425 rwhp mark .. you're just asking for it __________________ Car For Sale on Autotrader.com 04 Silver GT 32K Miles Parts 4 Sale: 18" Wheels SSR GT3 replicas w/ tires Steeda Tri-Ax 10lb N20 Bottle w. gauge (2) Kirkey Racing Seats w/ RCI 5 Pt. belts Steeda & Momo shift knobs SB GT Spoiler

July 11th, 2008, 01:20 AM	#9
SWEET2KSTANG mm's nitrous mod 2000 mustang gt 11.79@115.83 (old set up) Join Date: Oct 2006 Location: N.W. AR Posts: 12,541 iTrader: 8 reviews	how do you figure??? __________________ project warhorse under construction wagon burner under construction as well (04 lightning) being built by MP2 Performance

July 11th, 2008, 01:47 AM	#10
MeZ Enthusiast 2004 Mustang GT Join Date: Mar 2007 Location: Concord, North Carolina Posts: 966 iTrader: 0 reviews	because I've seen it happen time and time again, these cars are unpredictable even on good tunes, I've seen some gt's handle 450 rwhp for years and I've seen some blow on 400 rwhp after a few months .. these comming from the same tuners etc .. granted in general .. 400 rwhp on with a good tune should carry you a ways .. you never know with these cars .. esp on turbo apps, but this concerning a centri blower .. I've seen rods go numerous times __________________ Car For Sale on Autotrader.com 04 Silver GT 32K Miles Parts 4 Sale: 18" Wheels SSR GT3 replicas w/ tires Steeda Tri-Ax 10lb N20 Bottle w. gauge (2) Kirkey Racing Seats w/ RCI 5 Pt. belts Steeda & Momo shift knobs SB GT Spoiler

July 11th, 2008, 02:13 AM	#11
jaxdawg Regular 2004 mustang GT Join Date: Feb 2008 Location: Jacksonville FL. Posts: 189 iTrader: 0 reviews	but aren't you around 400-425hp anyway if you have a manual tans and a blower? and maybe a few supporting mods __________________ flowmasters, no cats, 3.73's, sct xcal2, eibach pro kit, CC plates, 75mm TB, plenum, T56 Cobra manual transmission,and last but not least a procharger P1SC. 400hp and 376ft-lbs

July 11th, 2008, 02:37 AM	#12
SWEET2KSTANG mm's nitrous mod 2000 mustang gt 11.79@115.83 (old set up) Join Date: Oct 2006 Location: N.W. AR Posts: 12,541 iTrader: 8 reviews	if a vehicle is properly maintained, there is no reason it should have any trouble with 425 and a good tune. __________________ project warhorse under construction wagon burner under construction as well (04 lightning) being built by MP2 Performance

July 11th, 2008, 03:16 AM	#15
jaxdawg Regular 2004 mustang GT Join Date: Feb 2008 Location: Jacksonville FL. Posts: 189 iTrader: 0 reviews	i have an automatic right now but i'm bout to put a t-56 in soon hopefully. i made 350hp with the auto, i'll see what i'll make with the manual __________________ flowmasters, no cats, 3.73's, sct xcal2, eibach pro kit, CC plates, 75mm TB, plenum, T56 Cobra manual transmission,and last but not least a procharger P1SC. 400hp and 376ft-lbs

July 11th, 2008, 05:07 AM	#17
dude496 Hardcore Enthusiast 04 Mustang GT Join Date: May 2007 Location: somewhere Posts: 1,371 iTrader: 2 reviews	wow, there is no way at all to argue either side of this. Some will hold strong, some will blow...thats just how it is. Seen some last for a long time and others blow really early. I honestly don't like the stock 4.6 bottom end, its pretty much garbage imo. I will say this much though...400 whp through an auto is asking for troubles. Drivetrain loss through an auto is around 20% vs drivetrain loss of a manual that is around 12%. In otherwords (lets say 10% manual 20% auto just for easy numbers)...400 whp in a manual is about 440 crank hp but on a manual 400 whp is 480 crank hp....see where i am going with that?

July 11th, 2008, 07:27 AM	#18
SWEET2KSTANG mm's nitrous mod 2000 mustang gt 11.79@115.83 (old set up) Join Date: Oct 2006 Location: N.W. AR Posts: 12,541 iTrader: 8 reviews	the drivetrain loss in a manual i a little more than that. manuals are roughly 15-17% loss. we are talking rwhp #"s, not fly #'s. if headwork is done, that will allow more as well. VE of a head is a key in making power, especially with the 2v set up. that is also where supporting mods and tuning is the key. i am not saying that these will not blow at 400, buit if ecerything is done correctly then it will hold beyond that. the condition of the motor is a key factor as well. __________________ project warhorse under construction wagon burner under construction as well (04 lightning) being built by MP2 Performance

July 11th, 2008, 12:25 PM	#19
03SuperchargedGT Enthusiast 2008 Cadillac CTS4 Join Date: Jul 2008 Location: Vancouver,BC Posts: 717 iTrader: 0 reviews	thanks for all the information so basically it would be smart on my part to keep it aorund 350-370 RWHP. keeping in mind all internals and bottom end is stock except for gears

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July 11th, 2008, 08:22 PM	#20
Eagle2000GT I Post Entirely Way Too Much 2000 Mustang GT 12.73@111.36 Join Date: Aug 2007 Location: Shelbyville, IN Posts: 5,312 iTrader: 1 reviews	I've worked with two tuners and talked to several others. The word I get from them is that if your car is a daily driver you shouldn't go higher than 370-380 rwhp. Every one of them knows of a car running 420 that has lasted a couple of years. I was also told that they've seen motors blow on the dyno at 350. It just depends on the motor. __________________ ProCharger P-1SC, 9 psi, STD 396/383; Uncorrected 388/375; SAE 383/370 Mods list in Garage.

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