do u know wht the topspeed of a 99 f 150 5.4 3 .73 would be casue i can run 100 mph easily and still climbing i was wonderin if anyone used an gps or something to find out.

all i know is it beats a toped out 5.3 CHEVY SUCKS

 

100 mph with the stock computer tune. I hit 104 going downhill, and I thought the truck was going to die, it started running really weird because the computer couldn't slow it down.

 

I dont know about the top speed per say but ive always seen the top end accel to be better on the 5.3 but the 5.4 is stronger down low.

Ive taken my 04 past 120 but i dont know how fast it was going my speedo stops at 120. It was still climbing thow. slowly.

 

my speedo stops at 100.. but its been burried several times before my lean factor came into play

 

Been at around 200 km/h with a Superchip, and believe she had more, didn't want to find out and my speedo is only 160 km/h. The only reason I knew that was the guy I raced said 197 on his speedo.

 

well doesnt the 5.4 have more torque on the lower end at around 2 grand other than the chevy 5.3 which has the torque higher arounbd 2500 or 3
idk tht y i am asking my buddy has a 5.3 and i can beat him off the line up to 25 35 easily but then he ties me then if we both goin 55 and we step them down he has me beat all the way to 65 70 not by alot but just ahead of me thne i can come back and tie him by 85 90 then his tops out at 97
the chip dont let it go any farther


thanks ford rules

 

HI!... When my F-150. 5.4 was stock it topped out at 175KPH (108MPH) due to the top speed limiter. Now with my built N/A 5.4 and 4.10 gears it buries my 220KPH (137MPH) speedo. Can max out at about 205KPH (127MPH) in 3RD gear.

 

yeh here lately my rev limited has limited me to 4,000 RPM in 3rd which is about 85 i think.. but meh.. ive got 24lb injectors and MAF on the way so hopefully ill have my fuel problem fixed here shortly!

 

i must have some real problems then i have a 02 fx4 with electric fans, k&n cold air hypertech 75 mm throttle body and flowmaster cat back with 3.55lsd on 33's and my buddys 03 z71 steadily walks away from me and hes sitting bone stock on 35's both trucks ae reg cabs.

 

Whats his gears?

Keep in mind most truck tires arn't good for over 100, so thats as fast as I go

 

Got up to 100mph a few weeks ago in my 02 SCrew with 5.4. Just left it in drive and gave it some gas and she was at 100 in no time and the rpm was only 4 grand. With 3.55 gearing that's not too bad. With some 4.10's I bet it would really fly.

I need to find out what's the mph in each gear at 6K???

 

I hope you have a tire blow out at 100 mph......

 

Why would you wish that? I don't agree with reckless driving but on an open road without traffic I see no harm in "opening it up" for a moment or two.

I certainly do not wish someone would blow a tire at any speed.

 

he has the same gears withour limited slip. but i think my hubs are staying locked hadnt check it for sure yet but could explain why its happening

 

Easy to calculate -

MPH = (rpm/drive ratio) * (tire dia/336)

Drive ratio is the gear ratio in the trans multiplied by the gear ratio in the axle.