2 more psi ?

Wally1968 · May 25th, 2007, 10:30 AM

I have a roush s/c in my 2006 vert stang right now. I told our local ford dealer that I wanted more power. He suggested a smaller pulley for the s/c that would give me another 2psi. Does anybody know about how more HP that would give me?

HMUSN · May 25th, 2007, 10:36 AM

about 15 crank HP per pound of boost.

rondaw3g0410 · May 26th, 2007, 08:36 AM

I put a smaller pulley on my Roush S/C and got 3 lbs more of boost
with a custom tune now puttin over 400 hp at the rear wheels

Wally1968 · May 26th, 2007, 04:36 PM

Thats awsome rondaw3g0410! Did you have the smaller pulley put in after you had the S/C installed or was it done all at the same time? If you had the pulley installed after could really feel the difference?

Modern_Muscle · May 26th, 2007, 09:17 PM

watch for belt slip on that new pulley wally, my buddy with an 06 roush did the same, and his belt would not quit slipping...I think they finally got it fixed, but I left before they told me the problem...

Wally1968 · May 27th, 2007, 12:43 AM

Thanks for the advice Modern_Muscle.

Grabber427 · May 27th, 2007, 05:42 AM

According to the Roush site the pulley adds 15 Hp. That sounds a little on the conservative side. Let me know how it goes if you do it, it's on my list. I'm wondering if it voids the warranty?

Modern_Muscle · May 27th, 2007, 07:06 PM

yes, voids warranty from what I was told, because you ahve to send in your cpu to roush and have them reprogram it, therefore, they void your warranty since they saw it come in. I would check to see if you can just get the pulley by itself, and then have a great tuning shop make a better tune....

Wally1968 · May 28th, 2007, 03:09 AM

Then what can I do to get more power without spending a ton of money? I'm already at about 420hp, I would love to get to almost 500hp. At this moment from what I've read in this forum for the past 6months, I'm regreting getting a roush s/c. I should have gone with a procharger or kennel bell.

Modern_Muscle · May 28th, 2007, 06:04 AM

n2o...lol

Wally1968 · May 28th, 2007, 10:29 AM

Ya that would work lol. I mean something that is more perminent. Anyways II hear that NOS is not good for the motor when you already have a s/c.

May 25th, 2007, 10:30 AM	#1
Wally1968 Regular Join Date: Jan 2007 Posts: 92 iTrader: 0 reviews	2 more psi ? I have a roush s/c in my 2006 vert stang right now. I told our local ford dealer that I wanted more power. He suggested a smaller pulley for the s/c that would give me another 2psi. Does anybody know about how more HP that would give me?

May 25th, 2007, 10:36 AM	#2
HMUSN Doc 1986 SVO 48.47@ 12.58 Join Date: Nov 2006 Posts: 37,047 iTrader: 10 reviews	about 15 crank HP per pound of boost. __________________

May 26th, 2007, 09:17 PM	#5
Modern_Muscle Hardcore Enthusiast Join Date: Jan 2007 Location: Texas Posts: 1,347 iTrader: 1 reviews	watch for belt slip on that new pulley wally, my buddy with an 06 roush did the same, and his belt would not quit slipping...I think they finally got it fixed, but I left before they told me the problem... __________________ 1998 Trans Am WS6. (Anti Venom) Forged 347, stage 3 T56, and a 76mm Turbo... 659rwhp @ 13.5# ~725rwhp @ 15.5# Meth, C16, and 20psi coming soon 03 Z71 (H/C/I/E/T)...sold 2005 GT, Full Bolt-Ons...12's... GONE

May 27th, 2007, 05:42 AM	#7
Grabber427 Regular 2007 Roush 427R Join Date: Jan 2007 Location: Vestal, New York Posts: 106 iTrader: 0 reviews	According to the Roush site the pulley adds 15 Hp. That sounds a little on the conservative side. Let me know how it goes if you do it, it's on my list. I'm wondering if it voids the warranty? __________________ 2007 Roush 427R #07-486 FRPP 3.73 Gears Roush short throw shifter Roush 73mm pulley and tune

May 27th, 2007, 07:06 PM	#8
Modern_Muscle Hardcore Enthusiast Join Date: Jan 2007 Location: Texas Posts: 1,347 iTrader: 1 reviews	yes, voids warranty from what I was told, because you ahve to send in your cpu to roush and have them reprogram it, therefore, they void your warranty since they saw it come in. I would check to see if you can just get the pulley by itself, and then have a great tuning shop make a better tune.... __________________ 1998 Trans Am WS6. (Anti Venom) Forged 347, stage 3 T56, and a 76mm Turbo... 659rwhp @ 13.5# ~725rwhp @ 15.5# Meth, C16, and 20psi coming soon 03 Z71 (H/C/I/E/T)...sold 2005 GT, Full Bolt-Ons...12's... GONE

May 26th, 2007, 08:36 AM	#3
rondaw3g0410 Newbie Join Date: Aug 2006 Posts: 25 iTrader: 0 reviews	I put a smaller pulley on my Roush S/C and got 3 lbs more of boost with a custom tune now puttin over 400 hp at the rear wheels

May 26th, 2007, 04:36 PM	#4
Wally1968 Regular Join Date: Jan 2007 Posts: 92 iTrader: 0 reviews	Thats awsome rondaw3g0410! Did you have the smaller pulley put in after you had the S/C installed or was it done all at the same time? If you had the pulley installed after could really feel the difference?

May 27th, 2007, 12:43 AM	#6
Wally1968 Regular Join Date: Jan 2007 Posts: 92 iTrader: 0 reviews	Thanks for the advice Modern_Muscle.

May 28th, 2007, 03:09 AM	#9
Wally1968 Regular Join Date: Jan 2007 Posts: 92 iTrader: 0 reviews	Then what can I do to get more power without spending a ton of money? I'm already at about 420hp, I would love to get to almost 500hp. At this moment from what I've read in this forum for the past 6months, I'm regreting getting a roush s/c. I should have gone with a procharger or kennel bell.

May 28th, 2007, 06:04 AM	#10
Modern_Muscle Hardcore Enthusiast Join Date: Jan 2007 Location: Texas Posts: 1,347 iTrader: 1 reviews	n2o...lol __________________ 1998 Trans Am WS6. (Anti Venom) Forged 347, stage 3 T56, and a 76mm Turbo... 659rwhp @ 13.5# ~725rwhp @ 15.5# Meth, C16, and 20psi coming soon 03 Z71 (H/C/I/E/T)...sold 2005 GT, Full Bolt-Ons...12's... GONE

May 28th, 2007, 10:29 AM	#11
Wally1968 Regular Join Date: Jan 2007 Posts: 92 iTrader: 0 reviews	Ya that would work lol. I mean something that is more perminent. Anyways II hear that NOS is not good for the motor when you already have a s/c.

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