Boosting after PI Swap

k3vin · September 22nd, 2007, 09:15 PM

What would be safest and highest boost I would be able to do after the PI swap? I plan to get supercharged eventually but I don't want a massive boost. I was thinking somewhere between 6-8 psi.

What could I do to compensate for the high compression ratio with a blower on my car?

HMUSN · September 22nd, 2007, 09:16 PM

port your non pi heads

k3vin · September 22nd, 2007, 09:18 PM

Would that be a better idea? Are the PI heads even worth the money?

caintcatchmyGT · September 22nd, 2007, 09:53 PM

If you P&P your PI heads is it going to be good or bad for lots of boost?

ChrisJ · September 22nd, 2007, 11:03 PM

You can run low boost...

Like 6-9 psi with a GREAT tune...

tlr96 · September 22nd, 2007, 11:08 PM

Originally Posted by caintcatchmyGT

If you P&P your PI heads is it going to be good or bad for lots of boost?

normally good but lots of boost wont be good if you have pi heads on a stock npi motor.

caintcatchmyGT · September 22nd, 2007, 11:18 PM

well i plan on running a stroked motor with forged internals...and alot more the 9-12 psi. am i safe with the PI heads?

ChrisJ · September 22nd, 2007, 11:21 PM

With 9-12#'s? NO not on the stocker...

Boost is only a measure of resistance...Even if you port the heads and such the boost will go down but the power would still be there...

With the built stroker you will be fine though...

tlr96 · September 22nd, 2007, 11:24 PM

yeah with pi heads on a stock npi your c/r raise to 10:5 i believe, so since your replacing the internals you will be fine as long as you run a lower c/r.

caintcatchmyGT · September 22nd, 2007, 11:27 PM

so as long as i chang the internals and do what i am talking bout with stroking it i can push more the 12psi and be ok...i wana push closer to 18-22psi on a TT kit. Am i safe?

k3vin · September 22nd, 2007, 11:28 PM

bah screw it im just gonna buy a pi engine!

G.T. Rags · September 22nd, 2007, 11:31 PM

Originally Posted by caintcatchmyGT

so as long as i chang the internals and do what i am talking bout with stroking it i can push more the 12psi and be ok...i wana push closer to 18-22psi on a TT kit. Am i safe?

as long as ur not pushing more then 450 horses.......

otherwise ur gonna need to forge ur bottom end

caintcatchmyGT · September 22nd, 2007, 11:46 PM

ya i plan on putting forged internals from the get go. that way if i need it i am ready. if not..no worries ya know

jersey98gt · September 23rd, 2007, 12:15 AM

sound slike alot of money for a 96 man

G.T. Rags · September 23rd, 2007, 12:18 AM

Originally Posted by jersey98gt

sound slike alot of money for a 96 man

people drop $10-$20kinto 5.0 fox bodies....

i know by the end of year 1 i'll have approx 4k thrown into my 96......

jersey98gt · September 23rd, 2007, 12:24 AM

forged bottom end with a twin turbo set up? thats alot of paper, i can justify that in a 5.0 or a 4v but not ours

G.T. Rags · September 23rd, 2007, 12:28 AM

Originally Posted by jersey98gt

forged bottom end with a twin turbo set up? thats alot of paper, i can justify that in a 5.0 or a 4v but not ours

justify it then......

i don't understand y it makes sense putting 10k into a 5.0, but not a 4.6.

AnglicoGT98 · September 23rd, 2007, 12:32 AM

Running boost after a PI swap GREATLY depends on who tunes your car. With some time and a really good tune you will be fine. It is nothing a compitent shop can't handle. I plan on running about 6psi turboed on my '98 after a full PI swap and a few other mods and my shop says I will be fine. And realistically your C/R will be around 10:1 - 10.2:1. That 10.5:1 figure alot of people say is figuring your engine is brand new and there isn't any sort of leaking. Pretty much in a perfect world that would be your C/R. You can always get your combustion chambers opened up a bit to give you a couple more cc's in there and drop your ratio another .10 or so. you are just going to have to pull alot of timing until you get some bottom end work, but you will be fine.

RandoGT · September 23rd, 2007, 12:38 AM

Originally Posted by 96GTRagTop

Originally Posted by jersey98gt

forged bottom end with a twin turbo set up? thats alot of paper, i can justify that in a 5.0 or a 4v but not ours

justify it then......

i don't understand y it makes sense putting 10k into a 5.0, but not a 4.6.

i have to agree. as long as you have a passion for your car, you drop as much paper as you want for all i care. i love my Stang and i'm gonna drop enough into it til i'm satisfied and when one of those 10K invested 5.0s or 4Vs tell me "Gaaaahhhhhh damn"

anyway, aren't there pistons to lower our compressions in those stroker kits?

jersey98gt · September 23rd, 2007, 12:40 AM

with 5k in a 5.0 it takes about 10k 4.6L to do the same

September 22nd, 2007, 09:15 PM	#1
k3vin Newbie Join Date: Aug 2007 Posts: 28 iTrader: 0 reviews	Boosting after PI Swap What would be safest and highest boost I would be able to do after the PI swap? I plan to get supercharged eventually but I don't want a massive boost. I was thinking somewhere between 6-8 psi. What could I do to compensate for the high compression ratio with a blower on my car?

September 22nd, 2007, 09:16 PM	#2
HMUSN Doc 1986 SVO 48.47@ 12.58 Join Date: Nov 2006 Posts: 37,050 iTrader: 11 reviews	port your non pi heads __________________

September 22nd, 2007, 09:53 PM	#4
caintcatchmyGT Regular Join Date: Jul 2007 Location: still here in Ft. Sill, Oklahoma Posts: 349 iTrader: 0 reviews	If you P&P your PI heads is it going to be good or bad for lots of boost? __________________ 1996 Mustang GT -MAC CAI -Polished 75mm TB and upper plentum -PI Intake Manifold -BBK underdrive pulleys -MAC Long Tube headers -Shorty H-pipe -Flowmaster Exhaust -18x9 275x35xR18 all around

September 22nd, 2007, 11:03 PM	#5
ChrisJ RLY SRS Join Date: Aug 2005 Location: Ft. Meade, MD Posts: 38,220 Blog Entries: 4 iTrader: 10 reviews	You can run low boost... Like 6-9 psi with a GREAT tune... __________________ 2008 Acura TL Type-S - 2008 EB Ford Expedition - 2002 Boosted GT - Sold Facebook Google+

September 22nd, 2007, 11:18 PM	#7
caintcatchmyGT Regular Join Date: Jul 2007 Location: still here in Ft. Sill, Oklahoma Posts: 349 iTrader: 0 reviews	well i plan on running a stroked motor with forged internals...and alot more the 9-12 psi. am i safe with the PI heads? __________________ 1996 Mustang GT -MAC CAI -Polished 75mm TB and upper plentum -PI Intake Manifold -BBK underdrive pulleys -MAC Long Tube headers -Shorty H-pipe -Flowmaster Exhaust -18x9 275x35xR18 all around

September 22nd, 2007, 09:18 PM	#3
k3vin Newbie Join Date: Aug 2007 Posts: 28 iTrader: 0 reviews	Would that be a better idea? Are the PI heads even worth the money?

September 22nd, 2007, 11:21 PM	#8
ChrisJ RLY SRS Join Date: Aug 2005 Location: Ft. Meade, MD Posts: 38,220 Blog Entries: 4 iTrader: 10 reviews	With 9-12#'s? NO not on the stocker... Boost is only a measure of resistance...Even if you port the heads and such the boost will go down but the power would still be there... With the built stroker you will be fine though... __________________ 2008 Acura TL Type-S - 2008 EB Ford Expedition - 2002 Boosted GT - Sold Facebook Google+

September 22nd, 2007, 11:24 PM	#9
tlr96 Hardcore Enthusiast 1996 Mustang GT Join Date: Mar 2007 Location: Effingham, IL Posts: 1,795 iTrader: 0 reviews	yeah with pi heads on a stock npi your c/r raise to 10:5 i believe, so since your replacing the internals you will be fine as long as you run a lower c/r. __________________ view my garage for pics and modifications listen to my exhaust video 1 video 2 video 3

September 22nd, 2007, 11:27 PM	#10
caintcatchmyGT Regular Join Date: Jul 2007 Location: still here in Ft. Sill, Oklahoma Posts: 349 iTrader: 0 reviews	so as long as i chang the internals and do what i am talking bout with stroking it i can push more the 12psi and be ok...i wana push closer to 18-22psi on a TT kit. Am i safe? __________________ 1996 Mustang GT -MAC CAI -Polished 75mm TB and upper plentum -PI Intake Manifold -BBK underdrive pulleys -MAC Long Tube headers -Shorty H-pipe -Flowmaster Exhaust -18x9 275x35xR18 all around

September 22nd, 2007, 11:28 PM	#11
k3vin Newbie Join Date: Aug 2007 Posts: 28 iTrader: 0 reviews	bah screw it im just gonna buy a pi engine!

September 22nd, 2007, 11:46 PM	#13
caintcatchmyGT Regular Join Date: Jul 2007 Location: still here in Ft. Sill, Oklahoma Posts: 349 iTrader: 0 reviews	ya i plan on putting forged internals from the get go. that way if i need it i am ready. if not..no worries ya know __________________ 1996 Mustang GT -MAC CAI -Polished 75mm TB and upper plentum -PI Intake Manifold -BBK underdrive pulleys -MAC Long Tube headers -Shorty H-pipe -Flowmaster Exhaust -18x9 275x35xR18 all around

September 23rd, 2007, 12:15 AM	#14
jersey98gt Enthusiast Join Date: Jan 2007 Posts: 661 iTrader: 0 reviews	sound slike alot of money for a 96 man __________________ -BBK CAI, BASSANI CB + X, SCT 93 tune, 4.10s, Cobra brakes, Cobra R wrapped in nitto 555 tire. -College Football and studies take up the bulk of my time.

September 23rd, 2007, 12:24 AM	#16
jersey98gt Enthusiast Join Date: Jan 2007 Posts: 661 iTrader: 0 reviews	forged bottom end with a twin turbo set up? thats alot of paper, i can justify that in a 5.0 or a 4v but not ours __________________ -BBK CAI, BASSANI CB + X, SCT 93 tune, 4.10s, Cobra brakes, Cobra R wrapped in nitto 555 tire. -College Football and studies take up the bulk of my time.

September 23rd, 2007, 12:32 AM	#18
AnglicoGT98 Enthusiast Join Date: Feb 2007 Location: Coral Springs, FL Posts: 630 iTrader: 2 reviews	Running boost after a PI swap GREATLY depends on who tunes your car. With some time and a really good tune you will be fine. It is nothing a compitent shop can't handle. I plan on running about 6psi turboed on my '98 after a full PI swap and a few other mods and my shop says I will be fine. And realistically your C/R will be around 10:1 - 10.2:1. That 10.5:1 figure alot of people say is figuring your engine is brand new and there isn't any sort of leaking. Pretty much in a perfect world that would be your C/R. You can always get your combustion chambers opened up a bit to give you a couple more cc's in there and drop your ratio another .10 or so. you are just going to have to pull alot of timing until you get some bottom end work, but you will be fine. __________________ Parting out 2003 SVT Cobra Air/Fuel http://www.moddedmustangs.com/forums...003-cobra.html Engine http://www.moddedmustangs.com/forums...003-cobra.html

September 23rd, 2007, 12:40 AM	#20
jersey98gt Enthusiast Join Date: Jan 2007 Posts: 661 iTrader: 0 reviews	with 5k in a 5.0 it takes about 10k 4.6L to do the same __________________ -BBK CAI, BASSANI CB + X, SCT 93 tune, 4.10s, Cobra brakes, Cobra R wrapped in nitto 555 tire. -College Football and studies take up the bulk of my time.

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