Best power boosters

carlos.elliott · 05-16-2004, 04:10 PM

I have a 04 gt 5 speed and want more power. What add ons should I do and what order. I want to do it in the order that makes the best gains.

LX5liter · 05-22-2004, 09:19 AM

The easiest way to get a good seat of the pants increase is to add a supercharger. Keep the boost fairly low (5-6#) on the stock engine. As you add better parts (bigger MAF, throttlebody, injectors, etc...), you can up the boost a bit, but don't go much past 9-10#s of boost on the stock bottom end.
You can also go the nitrous route, its cheaper on the original cash outlay, but you have to re-fill the bottle(s) once in a while.
Then there are turbos. They work great, but take up alot of room. I think next time I build another car it will be a turbo.
Whatever you decide, get a kit designed for your car, it will make installation alot easier.

carlos.elliott · 05-22-2004, 02:36 PM

What is the limit on a stock 4.6 bottem end as far as horepower before I have to open it up. I was thinking about a keene bell and the rest just bolt on stuff.

stangGT95 · 05-22-2004, 03:43 PM

I can't say for sure but I've heard 9-10# like LX5liter said. MM&FF dynoed an '02 4.6 w/ cat-back exhaust (baseline was 247hp/292tq) and 6,9,11, & 15# from a KB (latter 3 were intercooled and had a chip) as well as 36# injectors, boost-a-pump from the KB kit. There was a peak hp/tq of 351/366, 399/427, 430/466 (w/90mm MAF, 75mm TB, boost pipe +6hp at 6, +19 at 9, +26 at 11). Those mods plus race gas at 15# was 504/521. I wouldn't risk going above 9# but they showed what it's capable of. I'm liking the 4.6 more and more.

chrismustang · 06-05-2004, 06:52 PM

hey stanggt95 do you need to increase the rear end axel with out that power? what hp will it hold?

stangGT95 · 06-07-2004, 11:52 AM

I haven't heard how much they withstand or when's a good time to go to a 9" rear end. The only upgrades that I've heard on the 8.8 was lower gears and 31-spline axles. I'd say w/ that kind of horse, 31's probably wouldn't hurt to have.

LX5liter · 06-23-2004, 08:40 PM

In my opinion, anything with 250+ horsepower should get larger axles. The 28 spline stockers may last for a while, but they will break.

05-16-2004, 04:10 PM	#1
carlos.elliott Registered Member Join Date: May 2004 Location: Ohio Posts: 68	Best power boosters I have a 04 gt 5 speed and want more power. What add ons should I do and what order. I want to do it in the order that makes the best gains.

05-22-2004, 09:19 AM	#2
LX5liter dude5l Join Date: May 2001 Location: Grande Prairie, Alberta, Canada Posts: 603	The easiest way to get a good seat of the pants increase is to add a supercharger. Keep the boost fairly low (5-6#) on the stock engine. As you add better parts (bigger MAF, throttlebody, injectors, etc...), you can up the boost a bit, but don't go much past 9-10#s of boost on the stock bottom end. You can also go the nitrous route, its cheaper on the original cash outlay, but you have to re-fill the bottle(s) once in a while. Then there are turbos. They work great, but take up alot of room. I think next time I build another car it will be a turbo. Whatever you decide, get a kit designed for your car, it will make installation alot easier. __________________ Good luck! Brad R. 1992 L.X. 5.0 coupe MODS: A few little bolt ons New Best time ...11.60 @ 128 mph @ 2000+ ft altitude. Rice Haters Club member #39 Users rides #2542

05-22-2004, 03:43 PM	#4
stangGT95 Registered Member Join Date: Jun 2003 Location: Novinger, Mo Posts: 72	I can't say for sure but I've heard 9-10# like LX5liter said. MM&FF dynoed an '02 4.6 w/ cat-back exhaust (baseline was 247hp/292tq) and 6,9,11, & 15# from a KB (latter 3 were intercooled and had a chip) as well as 36# injectors, boost-a-pump from the KB kit. There was a peak hp/tq of 351/366, 399/427, 430/466 (w/90mm MAF, 75mm TB, boost pipe +6hp at 6, +19 at 9, +26 at 11). Those mods plus race gas at 15# was 504/521. I wouldn't risk going above 9# but they showed what it's capable of. I'm liking the 4.6 more and more. __________________ 95 GT w/ AODE and Transgo Shift kit, trans cooler, SpeedCal, KB 1.5 Flowzilla w/ 6# pulley, MAC chrome CAI, chrome radiator hoses, stock MAF w/ center post removed, 70mm PP TB, electrical boost & FP gauges, digital A/F gauge, 1 5/8" unequal headers, 2 1/2" ProChamber h-pipe, Borla catback exhaust, and 3.55's. Cobra RR hood, Saleen double wing, Xenon body kit, chrome Cobra R wheels 17X8 in front and 17X10.5 in the back.

06-07-2004, 11:52 AM	#6
stangGT95 Registered Member Join Date: Jun 2003 Location: Novinger, Mo Posts: 72	I haven't heard how much they withstand or when's a good time to go to a 9" rear end. The only upgrades that I've heard on the 8.8 was lower gears and 31-spline axles. I'd say w/ that kind of horse, 31's probably wouldn't hurt to have. __________________ 95 GT w/ AODE and Transgo Shift kit, trans cooler, SpeedCal, KB 1.5 Flowzilla w/ 6# pulley, MAC chrome CAI, chrome radiator hoses, stock MAF w/ center post removed, 70mm PP TB, electrical boost & FP gauges, digital A/F gauge, 1 5/8" unequal headers, 2 1/2" ProChamber h-pipe, Borla catback exhaust, and 3.55's. Cobra RR hood, Saleen double wing, Xenon body kit, chrome Cobra R wheels 17X8 in front and 17X10.5 in the back.

06-23-2004, 08:40 PM	#7
LX5liter dude5l Join Date: May 2001 Location: Grande Prairie, Alberta, Canada Posts: 603	In my opinion, anything with 250+ horsepower should get larger axles. The 28 spline stockers may last for a while, but they will break. __________________ Good luck! Brad R. 1992 L.X. 5.0 coupe MODS: A few little bolt ons New Best time ...11.60 @ 128 mph @ 2000+ ft altitude. Rice Haters Club member #39 Users rides #2542

05-22-2004, 02:36 PM	#3
carlos.elliott Registered Member Join Date: May 2004 Location: Ohio Posts: 68	What is the limit on a stock 4.6 bottem end as far as horepower before I have to open it up. I was thinking about a keene bell and the rest just bolt on stuff.

06-05-2004, 06:52 PM	#5
chrismustang Registered Member Join Date: Jun 2004 Posts: 9	hey stanggt95 do you need to increase the rear end axel with out that power? what hp will it hold?

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