I am looking for cams and a new intake for my 98 4.6 and everything I have read in the search says PI cams and intake, but when I look at other websites to buy the parts they are are always called something different. When people say PI do they really mean an original part that is off of the 99's to 04?
I am probably going to start with long tube headers and a better intake manifold(I am assuming the PI original equipment) and to save money I was wondering how hard it is trim down my excisting H-pipe to make the long tubes fit, or if that was even possible. Also how much is it going to cost to make the intake manifold work on my heads?
My car has 75,000 miles on it, and if I swap the cams will i need to put in new cam bearings?
I am looking for cams and a new intake for my 98 4.6 and everything I have read in the search says PI cams and intake, but when I look at other websites to buy the parts they are are always called something different. When people say PI do they really mean an original part that is off of the 99's to 04?
I am probably going to start with long tube headers and a better intake manifold(I am assuming the PI original equipment) and to save money I was wondering how hard it is trim down my excisting H-pipe to make the long tubes fit, or if that was even possible. Also how much is it going to cost to make the intake manifold work on my heads?
My car has 75,000 miles on it, and if I swap the cams will i need to put in new cam bearings?
just finished the PI intake and PI cam swap on my 98 last month (oct. for the intake), and as far as different companies calling them different things, the intake manifold is always known as PI intake manifold. do a search on the forums to see if anyone is selling a used one, or look on ebay. i got mine from MPS for $200, but thats because i didnt want to buy a used one and have it be broken or anything by the time it got here. usually about $100. make sure its the original one that has the "Ford" stamping on it. there are replacement intakes out there, mainly the ones made by dormain, which i have heard have fitment problems. the PI cams are probably going to have to be used, i got mine from ebay. if you dont want to take off the timing chain cover, make sure you get 01+ PI cams.
cant help you out with the longtube headers question, but as far as how much it is going to cost you to get the intake to work on your heads, its a perfect direct swap, if you get the PI intake manifold with the aluminum crossover thats already tapped for the 2nd coolant sensor. if its not tapped for it, there is a spot on the alumium crossover that you can tap, but you are going to have to look up what size taps you are going to need. you are also going to need to buy the heater return tube, alternator bracket, PI intake manifold gaskets, and maybe the water pump nipple, but you probably wont need the nipple, 98 GTs for the most part already have the PI nipple. total on parts (aside from the manifold) you are looking to spend about an extra $50-100,
on a side note, my car is a full bolt-on GT, with the exception of headers, and the PI intake/cams really woke up my car.
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RIP Gloria A. Torres
4/26/61 - 10/30/07
The best Mom-lady I could have ever asked for
I am looking for cams and a new intake for my 98 4.6 and everything I have read in the search says PI cams and intake, but when I look at other websites to buy the parts they are are always called something different. When people say PI do they really mean an original part that is off of the 99's to 04?
I am probably going to start with long tube headers and a better intake manifold(I am assuming the PI original equipment) and to save money I was wondering how hard it is trim down my excisting H-pipe to make the long tubes fit, or if that was even possible. Also how much is it going to cost to make the intake manifold work on my heads?
My car has 75,000 miles on it, and if I swap the cams will i need to put in new cam bearings?
SHouldnt cost much at all to install the PI intake on your car. All the 98s i know have the correct water pump nipple which makes things easier and u dont have to change it, all u need is a tube of RTV, PI gaskets and the coolant tube that runs under the PI intake, u need a PI specific one as the intake sits further down in the valley making u need the one that goes with that intake.
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1998 Mustang GT automatic stock gears, some mods...sold
Best et 14.690@94.37 with a terrible 2.24 60ft
New ride 2000 GTP, gutted air box with K&N, 180 thermo
Best Et 14.57@93.35
*mods after run, Autolite 605s, GMPP STB , MPS 3.7
Thanks guys, did you guys go with the plastic manifold or is there an aluminum one out there? If there is whats the price difference and is it worth it and will I need to do something to my computer? Also, what parts are needed for the PI cam swap, is there some kind of manual out there that I could read?
Thanks guys, did you guys go with the plastic manifold or is there an aluminum one out there? If there is whats the price difference and is it worth it and will I need to do something to my computer? Also, what parts are needed for the PI cam swap, is there some kind of manual out there that I could read?
i went with the plastic one because there werent really that many aluminum ones to go with, but there should be more coming out soon. also, for n/a cars that dont go past the stock revv limiter, the alumium intakes wont be too much of an improvement over the plastic ones seeing as to how most of those out-perform the plastic one above 6200rpm. there are manuals out there that take everything step-by-step on the PI cam swap, go to Modular Mustang Performance from Modular Depot 4.6L / 5.4L Mustang Performance and do a thread search there, there are lots of people who have posted on there. all i needed were the PI cams, PI cam bolts, the ford cam removal tool, 2 small c-clamps, torque wrench, and some assembly lube. after i got the valve covers off, it took me about an hour and a half for the drivers side, and less then an hour for the passanger side.
as far as the computer work goes, like i said i have pretty much all the bolt-ons on my car, along with the pi intake and cams, and still havent touched the computer. id probably get more power out of my car if i did, but i just havent gotten around to it yet.
__________________
RIP Gloria A. Torres
4/26/61 - 10/30/07
The best Mom-lady I could have ever asked for
if you decide to do it without taking off the covers, buy the ford tool, not the andersons one, ive heard too many horror stories involving the anderson tool.
__________________
RIP Gloria A. Torres
4/26/61 - 10/30/07
The best Mom-lady I could have ever asked for
Thanks reivaxtorres, i just came across some 02 PI heads and cams all together. I know markwondi has said that all you need to do is change the cams and intake and they are the same, but how much would I get from the heads, cams and intake over just the cams and intake?
Thanks reivaxtorres, i just came across some 02 PI heads and cams all together. I know markwondi has said that all you need to do is change the cams and intake and they are the same, but how much would I get from the heads, cams and intake over just the cams and intake?
yea, the pi cams and intake are good enough to put you with a 99+ gt, and the heads, while im not sure on the numbers, will put you slightly above a stock 99+. the most important factor in the heads (in regards to the PI swap) is the increase in compression. you will now be running somewhere around 10.5:1 ratio, which is not good if you want to go s/c, turbo, or spray, but really good if you want to stay n/a. a friend with a supercharged s2000 (11:1 ratio) just blew his head gasket this weekend for that very same reason. dont quote me, but i believe the heads will add about 15rwhp to the npi motors. (PI motors have smaller combustion chambers and different/deeper pistons than the npi, which have bigger combustion chambers and shallower pistons).
also, if you swap the heads, you will need to run higher octane gas, out here in cali you would need to run 91. i think most other states have 92.
Quote:
Originally Posted by hooligan98
Also what is the cost of a set of PI cams?
the cost varries on who and where you get them. if you get them brand new from ford, a local dealership quoted me about $220 for both. i got a set of used ones off a 2002 GT with about 20k miles on them on ebay for about $75 ($90 with shipping), and have seen them go for as low as $50. just depends on how lucky you are and how long you search.
most people go with just the intake and cams for 2 main reasons: 1) cheaper than the complete PI swap, and 2) keeps the lower compression ratio for going s/c later on. i did it because of #1.
Quote:
Originally Posted by hooligan98
Ps, I like your car in your avatar pic!
haha, thanks. it was taken during a drifting competition out here that got rained out, so i never saw where i ended up in the standings. i think i would have done good too...
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RIP Gloria A. Torres
4/26/61 - 10/30/07
The best Mom-lady I could have ever asked for
yea, the pi cams and intake are good enough to put you with a 99+ gt, and the heads, while im not sure on the numbers, will put you slightly above a stock 99+. the most important factor in the heads (in regards to the PI swap) is the increase in compression. you will now be running somewhere around 10.5:1 ratio, which is not good if you want to go s/c, turbo, or spray, but really good if you want to stay n/a. a friend with a supercharged s2000 (11:1 ratio) just blew his head gasket this weekend for that very same reason. dont quote me, but i believe the heads will add about 15rwhp to the npi motors. (PI motors have smaller combustion chambers and different/deeper pistons than the npi, which have bigger combustion chambers and shallower pistons).
also, if you swap the heads, you will need to run higher octane gas, out here in cali you would need to run 91. i think most other states have 92.
PI Heads are worth ~10rwhp, with most of that power being made due to the compression increase. The heads themselves are worth very little power over the PI's. 96-98 gt's had 49-51cc chambers and 11cc dish pistons. 99-01 had 17 cc pistons, while 02-04's got a slight bump with 14cc pistons.
As for the 10.5:1 compression on a PI swap, nitrous in fact LOVES compression. The more the merrier, the N/A engine i built was built around nitrous, and i had 13:1 compression when all is said and done.
As for as a blower goes, a PI headswapped car is fine with boost, as long as it's kept relatively low (ie. 8-10 lbs). Our motors can run with increased compression and boost relatively easy... in fact, our engine prefer to have more compression.
As for the 10.5:1 compression on a PI swap, nitrous in fact LOVES compression. The more the merrier, the N/A engine i built was built around nitrous, and i had 13:1 compression when all is said and done.
i didnt know that about nitrous, i always thought the less the better. i stand corrected. listen to mark on this one, he knows more than i do on this subject (and from experience, ive just read up on it).
Quote:
Originally Posted by markwondi
... in fact, our engine prefer to have more compression.
this i kind of figured, but didnt want to say anything. on a side note, what would be the bad side of running 11:1 compression on an n/a 2v?
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RIP Gloria A. Torres
4/26/61 - 10/30/07
The best Mom-lady I could have ever asked for
I priced some cams at a ford dealership today just to get an idea and they said it was 175 for each cam for a 2002 Gt. Are there any cams out there that dont need a stiffer spring and will be able to work with the computer without a tune that is alittle hotter?
yeah, i heard that ford might be increasing their prices on some stuff. what i like about the PI cams is that they give you a good improvement and they arent too complicated. i believe the rest of the cams require that you at least degree them, which i have no experience with, and that you at least tune ur car. with just the pi intake and pi cams, a tune is not required, neither is premium gas. i just run it to be safe. go to the "wanted to buy" section or "for sale" section of Modular Mustang Performance from Modular Depot 4.6L / 5.4L Mustang Performance forums and look around there or post there for some good used PI cams, someone is bound to have them cheap.
__________________
RIP Gloria A. Torres
4/26/61 - 10/30/07
The best Mom-lady I could have ever asked for
Confused on PI cam and intake swap! 
