Need More Power

99_F250_SD · #1 (**permalink**) 01-04-2008, 11:55 PM

I have a 99 5.4 f250 sd stick shift with a hypertech tuner, flowmaster, k&n fipk, leveling kit, and 35in tires, i dont know what to get for more power that i need badly.

galaxie641 · #2 (**permalink**) 01-05-2008, 01:04 AM

Looks like you need higher gears with those tires.

fun_suv · #3 (**permalink**) 01-05-2008, 01:05 AM

Welcome to the more power club. I have the 5.4 in my 99 Expedition and i think its a joke that Ford put this same engine in the heavier trucks (ie f250).

FLHRCforD · #4 (**permalink**) 01-05-2008, 08:26 AM

I think Galaxie mean to say lower hears. I have a 2001 F250 w/ 5.4 and have recognized that I will not pull the heaviest load or be the first one there. When I need that, I will buy a new truck. Later.

D

snowdog79 · #5 (**permalink**) 01-05-2008, 09:14 AM

I had the 2v 5.4 in my '00 7700, and pulled a 6k boat, 8k dump trailer and a large slide-in camper with it a lot, and never had any power issues. I would suspect the 35" tires are causing the problems. Lower gears would help. I think the 7700 had 4.10s, but I would want something closer to 4.56 in an SD because of the the much higher curb weight.

galaxie641 · #6 (**permalink**) 01-05-2008, 01:17 PM

Yeah I meant lower gears, my head cold is screwing with me today. It would be interesting to know what that truck has stock for gears.

99_F250_SD · #7 (**permalink**) 01-05-2008, 07:46 PM

Yeah i was looking in to gears i just didnt want to have to do that. But i guess i will go ahead and buy 4.88 gears. Got any other power adders?

fun_suv · #8 (**permalink**) 01-05-2008, 08:12 PM

Gears are gonna be the best way to get back to stock intended power. Im only on 33" MTR's and i can feel how slow the truck is now compared to when i had lighter 33" Pro Comps on the wheels. You might wanna try finding a nice light set of wheels to compliment the gears so you dont have all that rotating mass sucking away at the power.

Green Ford · #9 (**permalink**) 01-06-2008, 10:45 AM

Lower gears will help for sure. I'm running 38.5's on mine and noticed a big difference with the 4.88 gears. I don't tow any more but really love the lower gears for better acceleration. Yours most likely has 3.73's in it from the factory.

anfo · #10 (**permalink**) 01-06-2008, 10:53 AM

Theres always a supercharger, I would go for a whipple or kenne bell if available for your engine. I know I had a v10 with 4:30's and wished I had 4:56 or preferably 4:88's (I had a 6in. lift with 38's. with 35's I would look at 4:56's personally (and it will be expensive if you cant do it yourself, nearly 1500-2000 for both axles.)

99_F250_SD · #11 (**permalink**) 01-08-2008, 11:11 PM

how much power do you think i would gain stepping down to 33x11.5 tires?

LxMan1 · #12 (**permalink**) 01-09-2008, 12:54 AM

3.73 was the standard F250 2wd gearing with a 5.4L.
4.56 gears and a supercharger will make it fly!!