Take a look on this thread:
https://www.f150online.com/forums/sh...d.php?t=243688

 

I have to disagree on this one...2nd gear pull from idle to rev-limiter will suffice...

 

Are you going to disagree with the manufacturer of the edge programmer ?? At the same day and dyno my truck reached 400rwtrq in 3rd gear !

 

Yes I am. He is an old Superchips guy to begin with. And I have seen too many of their dyno tests with SC products on the 04-06 truck and ALL were done in 2nd gear....NO other devices needed to unlock torque management, etc. 1000 or 5000 rpm in 1st, 2nd, or 3rd gear will produce the SAME results...its a given, think about it....
Your 400 horsepower will be there in any gear whether its 1st,2nd,3rd,or even OD if your truck were capable of attaining the speeds necessary to get there...gear ratios have no effect on the engines output figures, they just enable a vehicle to get there quicker..
If Ford would have used better driveshafts then we could dyno in 3rd and you could do the comparison yourself.

 

Marc, i am not here to get into any fight and i have all respect for your comments but what explains the huge difference between the dyno pulls in 2nd and 3rd ? Take a look on graph.






Sorry for the graph but here are the numbers:
1) 2nd gear= 343.63.
2) 3rd gear= 397.64.

 

I can't explain it, and did not intend my statement as a flame or disrespect to you at all. All I can go by is what I have witnessed in the past. Horsepower is horsepower no matter where it is attained....
I have taken part in many dyno runs and have seen very little difference in several vehicles between 2nd and 3rd gear...(not worth mentioning as I have actually seen a 5-10 Hp difference in the same vehicle between runs) but that can also happen on the same vehicle, same gear between runs.

 

I tried to make a 3rd gear run in my truck starting at 3000 rpm but it would down shift causing false readings. I know that my truck will start in 2nd gear with the OD button off and stay there till it either hits the rev limiter or speed limiter and not shift into third and I had good results. I did see a 10hp difference between pulls but I also ran 300 rpm higher on my second pull. I would think that you would see higher torgue in second due to the multiplication factor of not being 1 to 1 but I may be wrong on that.


What are the two spikes caused from? shifting?

also what is the rpm of the torque readings, the chart is just showing MPH would like to see at what RPM you are making your TQ at
looks like first peak TQ reading was at 65mph and 2nd was at 88mph after a spike. having a spike in your chart will skew the data it really needs to be a smooth transitional pull with no shifting.

 

Hell, if I can find a Tranny that adds HP I'M BUYING IT! Seriously, the power is made in the engine not the tranny so I'm guessing it's just the Dyno software burping with the ratio change.

 

I used to run the dyno machine for a motorcycle shop and i will tell you that id does make a difference as to what gear you are in to the HP output showed on a dyno sheet. The reason why this is is that what you are doing with a chassis dyno is simply turning the drum under the tires and the computer in the system does a calculation using whatever formulas they are, don't ask me exactly as i am not a physics guy, and end up coming up with a number for you. I have actually done pulls on the bike i used to drag race in each and every gear so that i could put together a shift pattern of when to hit the next gear under ultimate torque both for gains and loss in the next gear. I beleive the way it works is a time to speed ratio the the computer deals with, knowing the the drum is X amount of lbs and it takes X amount of hp to make it go X amount mph in X amount of time.

I hope this clears things up a little bit.

Now the only true way to get you actual HP is to use an engine dyno but i don't know about you guys but i can't afford to mine done.