[mystang0673]

ok... anyone that has done a pi swap... what kind of hp did you increase because i know it ups the compression. im looking for every number that change. 1/4 mile, 60ft, mph, hp, tq. im tryin to help a buddy but if its only a few hp he doesnt wanna do it. any feedback would help

[HessiaN257]

From what I hear its somewhere around 40. But I'm sure someone who has done the swap can give you more accurate numbers.

[mustangmanic]

a pi swap will put you at 260 hp at the crank... basically the same as a 99-04 gt, all the 99-04 gt's gave that are different than the 96-98's are the PI heads and cams. so it will up it from 240 to 260 or so.

[mustangmanic]

my bad... it will give you 35-40... boosting it from 225 to 260

[40thmustanggt]

i thought is was more like 260 to the wheels?? maybe im wrong maybe lower but when they do a pi swap on there motor wont it bump there compression up higher then ours?? try posting this in the 96-98 part of the forum they will know more..

[HessiaN257]

It won't give you 260 to the wheels.

[B0B]

instead of a complete pi swap, just buy the heads and intake, then get some better cams

[mystang0673]

thats what im asking... bumping the compression up to 10.5 to 1 is supposed to up it like 100 hp. from what i have heard. has anyone done this yet?

[G.T. Rags]

Originally Posted by mystang0673 thats what im asking... bumping the compression up to 10.5 to 1 is supposed to up it like 100 hp. from what i have heard. has anyone done this yet?

who the hell told u that and was he smoking a crack pipe with bobby brown?

[RandoGT]

no way on the 100HP. they were smoking a HUGE crack pipe when they told you that. horsepower isn't that easy to come by with our motors. stock, a 98 GT should have somewhere around 180-190 at the wheels (correct me if i'm wrong) and with the swap you should be past the 200s. maybe 220-230. (again, correct me if i'm wrong)

[memphismustang87]

Originally Posted by RandoGT no way on the 100HP. they were smoking a HUGE crack pipe when they told you that. horsepower isn't that easy to come by with our motors. stock, a 98 GT should have somewhere around 180-190 at the wheels (correct me if i'm wrong) and with the swap you should be past the 200s. maybe 220-230. (again, correct me if i'm wrong)

a 96-97 has 215, 190 at the wheels. a 225, and i guess 200 at the wheels so it has about ten more hp. The PI swap gives u the intake manifold, heads, and cams that the 99-04s have. They work alot better with grasping some more hp than the stock 96-98 parts that restrict that those larger hp gains. It's just a cheaper resolution to hp than exspensive aftermarket intakes and ported heads and other cams. I have heard hp gains mainly around 40hp. But I have had a reputable mechanic tell me that with a good setup and good tune that u can boost that to more like 75. So I'm not sure. I would think that the PI intake and heads and maybe some better cams would do that for ya w/ a nice tune.

Hopefully someone w/ experience in this swap and a dyno tune afterwards will tune in and give some hard factual info.

[RandoGT]

talk to Fryrice, he'll know for sure

[Fryrice]

Sup fellas. Yo Rando.

The first time I had my car on the dyno, I had an all NPI motor. Mods at the time were K&N filter,off road MAC H-pipe and Flowmasters.

With that set-up I dynoed at 201.2 rwhp .


Now I got the full PI swap with VT Stage2 n/a cams and tune along with MSD/FRPP ignition parts and the mods previously mentioned..And you can see the numbers in my sig. Its well over 300 at the crank also.

The PI swap is a big improvement ,but the aftermarket cams really crank it up. I used to have a 2000GT ,so the difference was obvious to me.

[memphismustang87]

^ See, I knew fryd come to back up what I said. I mean hey, I pretty much know that cuz he explained all that to me.

BTW- Fry, do u know ur 1/4 time?

[G.T. Rags]

even 'f he doesn't know, my s'g should gve u a good 'dea of 't

[RandoGT]

lol, yeah. steroid abuser! if you need a direction to go with your GT then listen to what Fry has to say. made a lot of stuff clear to me

[Fryrice]

Originally Posted by RandoGT lol, yeah. steroid abuser! if you need a direction to go with your GT then listen to what Fry has to say. made a lot of stuff clear to me

haha . Thanks for the vote of confidence man. I definitely like to help out/ I know how it feels to be searching for the power.




Memphis ,no ETs on this set-up yet unfortunately . Haven't had a chance yet. It should be fairly low on street tires.




RAG,you got like the coolest sig up here.

[MustangMatt96GT]

Okay if you just swap only PI heads intake and cams all stock 99-04 parts. You should see around 255 to the wheels. The bump in compression from 9.3:1 to 10.4:1 with pI head with the 11cc dished piston makes it a little more powerfull than a 99-04 Stcok gt! And with after market cams 290 is easily achievable.

When i finally swap mine on i plan on around 305 to the rear wheels!

[RandoGT]

awesome Matt. can't wait to see vids of that either. and maybe you could answer a question i've asked a million times and still no answer.

what size or kind of pistons do i need to lower the compression after the swap? just for later FI applications

[mystang0673]

he just said.. with just the pi swap and some ignition stuff he went from 201 to 290 rwhp. so.. an 89 rwhp increase is well over 30-40. thank you very much for the info man..