PI head gains for 1/4 mile and horsepower

96redGT · May 2nd, 2008, 08:09 PM

i am going to buy the pi heads but i wanna get an idea of how much faster ill run in the 1/4 and how much horsepower i will gain. right now my mods are slp exhaust, bbk undrive pullies, bbk CAI, plenum spacer, sct 4 bank chip, and 70 mm t/b. i run a 14.5 at 95 mph. if anyone has an idea let me know thanks.

bigmike83 · May 2nd, 2008, 08:11 PM

you should be at mid 13s. make sure you get a tune for it and while your there go ahead and get some long tubes too. they are worth it for sure

96GTRagTop · May 2nd, 2008, 08:12 PM

just the heads?

not the entire swap?

lethal2v · May 3rd, 2008, 02:13 AM

you shouldnt expect a whole lot of gains with just the heads.

noppe180 · May 3rd, 2008, 04:04 AM

the whole swap is like 40+hp

bigmike83 · May 3rd, 2008, 09:03 PM

Originally Posted by noppe180

the whole swap is like 40+hp

maybe with out the tune. its more with the tune

screaming_04_cobra · May 6th, 2008, 12:45 AM

my last car was a 98 gt that i had done the full pi head swap with a typhoon intake manifold 75mm tb and a upper plenum and that car ran 13.6 @ 99mph on motor 12.54 @ 108mph with a 100shot of nos

nes · May 6th, 2008, 10:37 AM

id say mid 13s at 102-103 with the full swap

4POINT6 · May 6th, 2008, 05:39 PM

for the money time and agrivation of a pi sway just buy a nice N2O Kits and hit it with a 100 shot twoce the power easy install and you still keep your good gas mileage.

96GTRagTop · May 6th, 2008, 07:06 PM

are u trying to say he'd loose gas mileage by doing the PI swap?

all of his current mods actually help improve gas mileage as it is...... not much but when u add them together its 1-2 mpg. If he does the PI swap i couldn't posibly see him hurting his fuel economy..... when i did mine i picked up a MPG

nes · May 6th, 2008, 11:32 PM

4point6, u r the only person who i have ever heard speak of the pi swap as if Its not worth it...

Uncle Humjaba · May 7th, 2008, 12:01 AM

That's because his car is God's gift to npi mustangs

Anyway, PI swap definitely worth it, gas mileage is the same (if not better), it's not that hard to do, just grow some balls and do it. Before the swap I ran a 15.2 at 91, and I didn't get to run at the track but my friend did in his 5.0. He pulled a 14.4 and I ran him and had a car on him by 80, you can do the math.

96GTRagTop · May 7th, 2008, 12:02 AM

Originally Posted by Uncle Humjaba

That's because his car is God's gift to npi mustangs

Anyway, PI swap definitely worth it, gas mileage is the same (if not better), it's not that hard to do, just grow some balls and do it. Before the swap I ran a 15.2 at 91, and I didn't get to run at the track but my friend did in his 5.0. He pulled a 14.4 and I ran him and had a car on him by 80, you can do the math.

lethal2v · May 7th, 2008, 12:06 AM

Originally Posted by Uncle Humjaba

That's because his car is God's gift to npi mustangs

Anyway, PI swap definitely worth it, gas mileage is the same (if not better), it's not that hard to do, just grow some balls and do it. Before the swap I ran a 15.2 at 91, and I didn't get to run at the track but my friend did in his 5.0. He pulled a 14.4 and I ran him and had a car on him by 80, you can do the math.

Thats the funniest thing ive read all night.

Blacksunshine98 · May 7th, 2008, 11:50 AM

Before my swap i ran a 14.5 after swap and a great tune my best is a 13.6 thats not to shabby if you ask me. and this was done on street tires!! and 4.6 my gas mileage didnt go down after the swap!!!!!

Mods are Anderson power pipe ,70mm Tb, 90mm Mass air,BBk upper plenum PI intake,PI heads and cams, A custom gasket to bring my compression back down,410's, FRPP Shorty headers, MAC O/R H, Pypes Cat back, and a street tune!!! the runs like a raped ape!!! oHH and it's a auto!!

4POINT6 · May 7th, 2008, 05:34 PM

Originally Posted by 96GTRagTop

are u trying to say he'd loose gas mileage by doing the PI swap?

all of his current mods actually help improve gas mileage as it is...... not much but when u add them together its 1-2 mpg. If he does the PI swap i couldn't posibly see him hurting his fuel economy..... when i did mine i picked up a MPG

More compression more Hp More fuel being dispursed .o yea gas mileage is gettin way better ..

Originally Posted by nes

4point6, u r the only person who i have ever heard speak of the pi swap as if Its not worth it...

True storie...

So my hunk of shit NPI car went 14.50s at 95mph with 4.10s and a cold air intake flowmasters on stock car back

Since that run i installed a 75mm T-body, Plenum spacer, Gutted Stock H-Pipe ,10.4 Taylor wires,Screamin demon coil packs,k&nGranitelli tuner .4% More fuel ,2-4 deg Adv, EGR OFF,Rear O2's Off,Raised Rev limmiter to 6250rpm..

On a Used set of 315-35-17 M-t Et Streets the car went 13.77 at 102mph 2 weeks ago with a 1.9 60 Foot..

And i was told many time before that its impossible for my car to rev to or make power up to 6k rpm(Old Video)

YouTube - 1998 4.6 20-125mph

nes · May 7th, 2008, 06:01 PM

bottom line dude, is your not gunna make the same power as u wuld with simple pi components. with your set up and a piswap, u can hit 12s easily. my car went 14.4 at 97 with an xpipe, k&n, and stock gears(my last car).

MustangMatt96GT · May 7th, 2008, 06:05 PM

4POINT6....

The stock limiter should be set at 6250 anyway. Shutting off the rear O2s do nothing other than CEL, and turning off the EGR also does nothing but ruin gas mileage.

And your times are not impressive at all....

RandoGT · May 7th, 2008, 06:20 PM

lol, owned by Matt.

not tryin to thread-jack but Matt! i just read on sn95forums that you blew the motor? that sucks dude. great slips though. what all was your set-up? it kinda scared me cause i'm gonna be running P&P'd PI heads, VT Stage II N/As, PI intake, 4.10s (after a little while), and full exhaust (check other thread i made) and i know you ran something similar.

jlaw98gt · May 7th, 2008, 06:35 PM

a 13.7 is pretty impressive with just minor bolt ons and slicks...the only big bolt on being gears...

May 2nd, 2008, 08:09 PM	#1
96redGT Newbie Join Date: Sep 2007 Posts: 6	PI head gains for 1/4 mile and horsepower i am going to buy the pi heads but i wanna get an idea of how much faster ill run in the 1/4 and how much horsepower i will gain. right now my mods are slp exhaust, bbk undrive pullies, bbk CAI, plenum spacer, sct 4 bank chip, and 70 mm t/b. i run a 14.5 at 95 mph. if anyone has an idea let me know thanks.

May 2nd, 2008, 08:11 PM	#2
bigmike83 Regular 1997 mustang gt 8.06 at 87mph 1/8th mile on a 50 shot Join Date: Nov 2006 Location: clarksville TN Posts: 267	you should be at mid 13s. make sure you get a tune for it and while your there go ahead and get some long tubes too. they are worth it for sure __________________ 97 gt with 2004 pi motor,acufab intake and 75 mm bbk cold air kit,bbk long tube headers, off road h pipe,2 chamber flow, 3:73, diablo chip with dyno tune 269rwhp 301rwtq

May 3rd, 2008, 02:13 AM	#4
lethal2v Hardcore Enthusiast Join Date: Feb 2007 Location: Grand Island, Ne Posts: 1,410	you shouldnt expect a whole lot of gains with just the heads. __________________ 1996 Mustang GT, Full PI Swap, MGW Shifter, Magnaflow Cat-back, K&N Filter

May 3rd, 2008, 04:04 AM	#5
noppe180 Regular 1998 GTvert Join Date: Nov 2006 Location: Houston,TX Posts: 110	the whole swap is like 40+hp __________________

May 6th, 2008, 05:39 PM	#9
4POINT6 Enthusiast 1998 Mustang GT Join Date: Dec 2007 Location: Orlando Posts: 502	for the money time and agrivation of a pi sway just buy a nice N2O Kits and hit it with a 100 shot twoce the power easy install and you still keep your good gas mileage. __________________ 1998 Gt 5-Spd.Bolt On's,Tune,Gears,Eibach Drag Springs

May 6th, 2008, 12:45 AM	#7
screaming_04_cobra Newbie screaming yellow 04 cobra 11.92@117.78 Join Date: Apr 2008 Location: houma Posts: 9	my last car was a 98 gt that i had done the full pi head swap with a typhoon intake manifold 75mm tb and a upper plenum and that car ran 13.6 @ 99mph on motor 12.54 @ 108mph with a 100shot of nos

May 7th, 2008, 12:01 AM	#12
Uncle Humjaba Enthusiast 1996 Mustang GT Premium 15.2@91 Join Date: Aug 2007 Location: Tracy, CA Posts: 521	That's because his car is God's gift to npi mustangs Anyway, PI swap definitely worth it, gas mileage is the same (if not better), it's not that hard to do, just grow some balls and do it. Before the swap I ran a 15.2 at 91, and I didn't get to run at the track but my friend did in his 5.0. He pulled a 14.4 and I ran him and had a car on him by 80, you can do the math. __________________ "He is no fool who gives up what he cannot keep to gain what he cannot lose."

May 7th, 2008, 11:50 AM	#15
Blacksunshine98 Regular 98 Mustang GT 13.6 @ 102 Join Date: Jan 2008 Location: Delawhere Posts: 118	Before my swap i ran a 14.5 after swap and a great tune my best is a 13.6 thats not to shabby if you ask me. and this was done on street tires!! and 4.6 my gas mileage didnt go down after the swap!!!!! Mods are Anderson power pipe ,70mm Tb, 90mm Mass air,BBk upper plenum PI intake,PI heads and cams, A custom gasket to bring my compression back down,410's, FRPP Shorty headers, MAC O/R H, Pypes Cat back, and a street tune!!! the runs like a raped ape!!! oHH and it's a auto!! __________________

May 7th, 2008, 06:05 PM	#18
MustangMatt96GT I Post Entirely Way Too Much 1996 Mustang GT 14.631@93.51 @ 5800 FT Join Date: Dec 2006 Location: Lakewood, CO Posts: 6,958	4POINT6.... The stock limiter should be set at 6250 anyway. Shutting off the rear O2s do nothing other than CEL, and turning off the EGR also does nothing but ruin gas mileage. And your times are not impressive at all.... __________________ We expect shit to break, look foward to realizing exactly when it is happening, and than obsess about dropping plenty of cash to rebuild stronger, so we can try to run it hard as hell and break again. We are sick individuals.

May 7th, 2008, 06:20 PM	#19
RandoGT Enthusiast 1998 Mustang GT Need to hit the track Join Date: May 2007 Location: Katy, TX Posts: 816	lol, owned by Matt. not tryin to thread-jack but Matt! i just read on sn95forums that you blew the motor? that sucks dude. great slips though. what all was your set-up? it kinda scared me cause i'm gonna be running P&P'd PI heads, VT Stage II N/As, PI intake, 4.10s (after a little while), and full exhaust (check other thread i made) and i know you ran something similar.

May 7th, 2008, 06:35 PM	#20
jlaw98gt Hardcore Enthusiast 1998 mustang gt 12.6@110 Join Date: Dec 2007 Location: northern new jersey Posts: 1,748	a 13.7 is pretty impressive with just minor bolt ons and slicks...the only big bolt on being gears... __________________ ECCAFA NJS 98 gt with a few bolt ons

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