Just curious as to what kind of numbers the 5.4's are putting down. We have a chassis dyno at work and I will probably put my SC on there. I may try to slap on an Airraid while it's on there. I will definitely post the results when I get some pulls.

 

That would be great, please keep us posted.

 

I put my 99 on a dyno once and the guy would only do second gear. He stated I did not have speed tires so he would only do 2nd gear as I stated. Then I was told that the results would be wrong for not using 3rd gear. Anyway it dyno'd at 218 hp and I don't remember the torque. That was with superchip,k&n fipk, flowmasters. I ran a 15.498 best with it once in not perfect weather, so I think it may have more than that showed. Keep us posted

 

Yes, a second gear pull will produce slightly lower #'s than a 3rd gear. Basically cause there isn't much of a load on the engine in 2nd as would a 3rd gear pull. My calculations come to be 273hp using the 218rwhp #'s. I would say prolly another 5-10 to that would be the actuall #'s the engine is making. I hope my 01 is making about that stock as they are rated more than the previous years, correct? I think the ratings are 260 vs the 230 previous?? Someone correct me if I'm wrong.

 

HI!... SOOPERCREW : The "97" - "98" 5.4's were 235H.P. The "99" to current 5.4's are all 260H.P. The majority of stock 5.4's with the 4R70-W tranny make about 195RWH.P. In stock trim the drivetrain loss is about 65H.P, but will slightly increase with more power being produced. If I'm not mistakin, doing the dyno test in 2ND gear will actually give you higher H.P #'s than actual.

 

Hey Neal, not to contradict you but my 99 owners manual says the 5.4 is rated at 250 HP @ 4500 RPM and 345 LB-Ft of torque @ 2250 RPM

 

Phew, that's a long sig!! Are you sure you didn't forget anything in there.....!! As for the dyno, it's best to make pulls in 3rd gear for auto's and 4th gear for standards. More load on the engine will produce the most accurate #'s.

 

HI!... F-150FREAK : The F-150 owners manual are full of misprints. It's a well known thing. "99" - "2002" 5.4's are 260H.P.

 

HI!... SOOPERCREW : I know what gear to run a vehicle on the dyno. Look at my lower SIG, I'm no "NEWBIE" to the H.P game. When on the dyno you need to have your vehicles tranny in a gear that will yeild you exactly or as close as you get get to a true 1-1:00 ratio for the most accurate H.P/TORQUE readings. The SIG is that long because that is the mods I have. I got sick of people asking me all the time what mods I had done to my truck to make it so fast N/A. Now they can read it, and not bother me.

 

Well Mr Neal.....explain to me how your making 80hp more than stock with those mods? Have you dyno tested your truck? If so, then you should be pulling about 272rwhp. My guess your truck would be around 20-30more hp than stock cause 90% of everything you bought didn't do anything. The only thing I can see that gave you some good hp would be the modified air intake and the underdrive pulleys. So people always asked about your window tint? Ford locking lug nuts? OK!! I guess there are no rules about keeping sigs short and to the point on these forums. People don't want to scroll through 10 pages of sigs. Now, back to the dyno #'s in question.....your exactly right in this post about running 1:1 ratio as it will give the most accurate #'s. However, if you make a pull in a lower gear(ie. 2nd gear), it will produce inaccurate #'s that will be a little low.

 

I would have to agree that the second gear pull will cause a higher reading. Torque converters will multiply the reading. Having seen several magazine tests, I agree with Neals statement, most stock 5.4s will dyno in the 190s.

Some places will use second gear, as third gear runs with a taller gear ratio will often hit the speed limiter and cause an incomplete run. From what I've seen posted, second gear runs are erratic at best, probably due to the fact that the converter lock up hasn't occurred yet.

As for the comments on the sig, I agree it is long. Having been on the board for a while, I can understand why he puts it all in there. I've seen first hand why he tires of explaning what he did to get a NA 5.4 in the mid 14's.

As for the statements on the output of Neals' truck.......

This theory of him only gaining 20-30 HP doesn't jive. How many full size trucks that only put 220 to the wheels pull mid 14s in the 1/4 mile? I don't know if he's had it on the dyno or not, but the track times are more in line with a early second generation Lightning than they are with a "regular" F-150.

 

Oh great, here we go again. More doubters. Neal, just ignore 'em. Add a couple of your videos to your sig and they can see what your truck really can do. Personally I would get real tired of having to defend my truck all the time against those who can't comprehend a normally aspirated truck turning your numbers.

Later.

 

Neal seems like a nice guy. In fact I've gotten advice from him before and it was good. However, everyone that I spoke to about the 2nd gear said it would be low including my neighbor who is a ford certified something mechanic. If I remember correctly, when I posted the numbers in the computer chip section, Neal responded to take my truck back and demand them to do it in 3rd gear so it would be correct. By the numbers being stated about the 190's stock 218 seems pretty close to what it would be with the mods I've made, but I would like to do it in 3rd gear just for the hell of it!!!

 

Signmaster and SilverScrew,

Hello.....did I ever say anything about his 1/4 mile times? I can believe his truck ran those times. I'm not doubting that. I'm saying there is no way his truck is making 340hp. Do you actually believe that. Lets say a single cab truck weighs in at 4500lbs. If you use his mph and weight, that factors in to be making about 290 hp roughly. That is very believable. He is no where near 340hp though. I also agree that auto's and torqe convertors do some wierd things on a dyno, however if the motor doesn't have much of a load on it, won't it make less hp? For example, do you think your engine is making 260hp in neutral when you just rev it up? Not even close. This is because there is no load on it. Another example would be a turbocharged engine. To produce the most accurate #'s on a dyno a torqe brake is used to build up boost. If you don't use the brake the engine won't make the boost and therefore will make less hp. Also, once a torque convertor locks up the #'s are higher than a convertor unlocked. Kind of like a stick car as there isn't as much frictional hp loss(only about 15% as compared to 20%). Working at a speed shop with a Dynojet chassis dyno for 2 years, I've learned a good bit. I see what works and what doesn't.

 

Soopercrew.....Uh what are you looking for? If you work in a "speed shop" is that in the front or back? You really want to tell how much that 5.4 is making run it at the track. MPH don't lie. Truth is 190 rwhp stock for ballpark. Already said, done. Let's not play a numbers game as your numbers????? 290rwhp+4500lbs=93mph trap speed?????? Get real. Just alittle off. Dyno all you want, the only #'s that matter are on that little slip of paper; they don't lie. Personally I don't like the things, they're no fun.