build up of stock 1998 GT >>help<<

[Pughman]

I have yet to see Ported PI's with the swirl dams match Renegade Racing's Ported NPI's flow across the board. Johnny Langton's ported NPI's flow 225 CFM at .550 lift with the swirl dams. Fox Lake's Stage II's don't, VT Stage II's don't flow that well and those NPI's outflow those ported PI's across the board. If you want PI's that flow better, you need MPH PI's but those have the swirl dams removed, so they are slow burning heads. Removing the swirl dams from NPI's is one of the features of the SVO head, which ported will OUTFLOW MPH Stage III's. So you might want to rethink that.

PI vs NPI-data

http://forums.modulardepot.com/showthread.php?threadid=2634&highlight=NPI+heads

 

[NPIGT]

This is the route I'm taking. PI heads and intake manifold, mac long tube headers and shorty offroad H pipe. 4.10 ring and pinion, subframe connectors, steeda tri-ax, and vt stage 1 cams. maybe next summer some N2O, upper tb, plenum, and an aluminum driveshaft. I would atleast go with the intake manifold in your setup if your admint on not changing the heads. Good Luck!!!

 

[TGJ]

PI vs NPI-data

http://forums.modulardepot.com/showthread.php?threadid=2634&highlight=NPI+heads

I am aware of that thread and many others. That thread is old as things have changed since then.

 

[DropTopPony]

I am aware of that thread and many others. That thread is old as things have changed since then.

you have a link for renegade racing? I was aware that they got good flow from npi's but not 225. The most I remember reading about was @212 and i think they were done by steen racing.

 

[Pughman]

I am aware of that thread and many others. That thread is old as things have changed since then.

ya ! he got better ! over 300 with the new cams !

 

[TGJ]

you have a link for renegade racing? I was aware that they got good flow from npi's but not 225. The most I remember reading about was @212 and i think they were done by steen racing.

Renegade racing does not have a web-site. His NPI's intake and coolant ports are PI matched and that is where the extra few CFMs come from.

 

[Pughman]

In the mag they only gained like 8hp with the upper/TB/CAI and i think headers...I have to re-read the article...I had lots of boltons when I was all NPI and didn't feel much in the SOP with full exhaust and CNL CAI,Upper and 75mmTB. Car felt stronger down low but @4000rpm's it would just die...when I did the PI swap it was Night and Day....I contribute most of this to the PI intake and cams...I have driven a NPI GT with just the PI intake and PI cams...and it pulled hard past 5000rpm's...something it didn't do with the NPI stuff.

is this the one ?

http://www.musclemustangfastfords.com/tech/mm_0406_mods/

 

[DropTopPony]

is this the one ?

http://www.musclemustangfastfords.com/tech/mm_0406_mods/

no, the one i was reading was recent, in the past 2-3 issues and was tests run on an actual car....not a ringer motor wist fast engine mngt etc..i will find it and tell you what one. It was actually very dissapointing to read....haha..

 

[Pughman]

ya .. im not look'n for the best as of yet .. just want a nice street machine , ill do the big motor in a couple years...

 

[DropTopPony]

article was in oct 05 issue of MMFF...
project "red headed stepchild"
stock dyno = 195rwhp
C&L Inlet tube/MAF housing/Filter =0 hp gain?
C&L upper intake/ accufab 75mmTB=2hp
bbk underdrive pulleys=2hp
tune= 7hp

not very good! I've seen these mods on PI gt's make more HP!!! so I totally believe its the NPI intake. more air=more power

 

[tomustang]

damn that project bombed from the start

 

[DropTopPony]

they want to get 300rwhp and stay completely NPI and NA before they go with the power adder down the road.....I don't think so....but i have to give them props for not sugar coating the numbers and adding these parts to a ringer dyno motor...this was a real 96 that was stock. Damn my car was slow when I bought it....lol

 

[venom97]

can you run a blower with the pi conv. i heard it changes the compression a little bit?

 

[DropTopPony]

can you run a blower with the pi conv. i heard it changes the compression a little bit?

yes you can run a blower with a pi swap, if you just change the intake then the compression doesn't change. I know alot of guys running reasonable amounts of boost on full PI swaps with good tunes. You just cant go crazy with that 10.5:1 or so compression.

 

[tomustang]

Damn my car was slow when I bought it....lol

don't remind me about auto non-pi's.. lol




get on yahoo

 

[Joel's98GT]

no way in hell, they at least need the PI intake, or some super secret aftermarket one.

 

[TweekedGT]

Well here goes, this is going to be a long list.

2004 PI Heads
2004 PI Intake
FRPP 3.73's
VT Stage 2 Cams
Comp Cams Springs
Mac Straight Shot CAI
Mac Longtubes
Mac Prochamber
Accufab 75mm T body
Granatelli Plenum
Magnaflow Magnapack Catback
Pro 5.0 Shifter
Centerforce Dual Friction Clutch
17x9 and 17x10.5 2004 Cobras
Nitto 555R's 315

My only regret is i wish i had lower compression because i want to go blower. I have a 5.0 stroker on order from VT right now to change all that. If you are going to stay NA i would think about going PI. After seeing the ports on my old NPI vs my new heads there is no contest. The new outflow the old way more. A guy with the SVO heads dyno before me with almost my same mods and he dynoed only 255rwhp on a Mustang Dyno. I dynoed 267 with my new set up, stock unported PI's with VT stage 2's. On the Dyno Jet mine put down 293rwhp.

 

[CanadaStang]

get some romeo PI heads+cams, nitrous, port out the stock plenum, get a 75mm tb. you'd be running 12's easy.



you'd need a tune for cams to run good

While some people will disapprove of the nitrous route, it is the quickest easiest way into the 12's, while still leaving you with the stocker's reliability and fuel mileage.

Edit: If you want to keep the NPI heads, getting them ported and swapping in some cams and a PI intake and then an NX nitrous system would be a relatively easy way to get great results.