hi guy i need an expert on a problem that im having ok today i noticed my bros expedition is faster and more powerful then my expedition i have a 1998 5.4triton 4wd w/coldairintake and pipes and well kept and my bros is a 2001 4.6triton non 2wd and is not so well kept its bone stock and needs oil/transmission fluid/spark plugs and today he was hualing a car and with a heavy trailer and today we were riding up hill and he started to leave me behind! i was so embarrassed i have a 5.4 and he has a 4.6 how is his truck more powerful???is there somthing wrong with my transmission???do u thing theres something wrong with my motor? PLEASE HELP!!!!

 

depends on what gears he has and hes 2wd? less weight and moving parts. it helps alot.

 

we were riding on the highway i was behind him all the time or at least try to keep up

 

yea i would say its gears.

 

If he was pulling a trailer & you weren't, I'd say you have a problem.

 

I'm sure it's the gears, plus you have a NPI motor and he has a PI motor

 

what u mean npi, pi motor?

 

In 1999 Ford motor company redesigned the cylinder heads on the 4.6L and 5.4L SOHC engines. NPI=Non performance improved heads PI=Performance improved heads. The main differences being the PI heads have more threads for the spark plugs and have much better flow characteristics then the 98 and older style non pi heads. There might be some other changes as well but those are the 2 major ones. Better flow always = more HP

 

If you really want to kill your brother ride Ill make you a killer deal on an L swap with very low miles. L swap meaning Lightning"Supercharger" it makes lot of heat and thats why i hate all postive displacment blowers but it is what it is.

 

i have a question. not to hijack but are the exhaust ports the same on a no pi as a pi head? i am in need of a motor and would like a pi but dont wana mess with headers again.

 

I’m not sure but summit lists the headers as being the same part number if that helps. I don’t blame you I wouldn’t want to buy stuff over and over again like i've done in the past LOL. I think there the same if the part numbers are the same. John

P.S. put a blower on there you got the exhaust already so feed her. All you need is the fuel and air now!! you can find great deals on the blowers right now with the way the economy is " ITS A BUYERS MARKET ON EVERY THING RIGHT NOW" powerdyne is a great way to start out for a taste of what a SC will do for you plus there dirt cheap An almost complete kit will only set up back a grand or less. There’s no other upgrade that will give the HP for the buck like a SC or turbo will. Not even heads and cams can do the same and that’s for real.

 

5.4L NPI - 235 hp
5.4L PI - 260 hp

4.6 NPI - 220 hp
4.6 PI - 231 hp

Your '98 Ford 5.4L NPI -235 hp
His '01 Ford 4.6L PI - 231 hp
Also your 4x4 is heavier and it's probably higher so, all things being equal he should edge you.

But if he was pulling a trailer and still spanked you, something else is going on.

 

dont wana hijack but its bassically just puttin a motor in to get by till i either get a super duty body or decide to drop the diesel in the expy.

 

ok thanks now i know what im have to improve or just buy another expedition, so basically 97 98 was the retarted edition right? well this suxs well at least my expedition tops at 120 and his cuts off 100

p.s. would the year 99-02 5.4 engines fit in my expedition with no problems?

 

ofcourse...