I have checked fuel mileage while towing my 11.5k 5th wheel from the PNW to Martinsville, VA where I am presently (watching the NASCAR race). In the Rockies averaged 7.37 - 7.93 mpg, Midwest averaged 7.56 - 8.07, In KY, TN and VA running through the Smokies averaged a pathetic 6.89 - 7.82. Leaving here next Tuesday for a run down the Blue Ridge Parkway and then to Biloxi, MS. Will be in Biloxi about two weeks and will install the Accufab SCTB96-98 then.

 

You're going to love that True Trac and 4.30 combo. When all the snow came through Texas the last two Februarys, I was able to run around with tons of grip. I have no regrets choosing that over a locker.

 

I have not had the pumpkin open yet, but i strongly suspect there is already a posi or LSD in there because when i intentionally burn out with the truck i get both tires going, now whether that's just because they both have enough traction that one wheel does not free spin, or its actually already been upgraded previously to some form of Posi, etc, not sure.

I mentioned that to the shop and they said well if there is already a good equivalent differential already in there they are happy to inspect it, make sure its solid and if so, just keep it and save the cost, so i guess we will see soon enough.

I have taken it out in deep sand, rocky terrain, deep mud, and at least since the lift and new wheels and tires, i have not had even a slight issue with traction or flotation, it has done quite exceptionally, even cross a dry creekbed half the time going to the ranch, and once recently, the day after it had been running with 5 feet deep of flow after a flash flood.

it was a little squishy, but no stucky.

 

Hopefully everything goes to plan today, we shall see in about an hour or two...

 

Three cheers to the man who nearly suffocated for our curiosity.

Y'all are gonna like the numbers...

 

So i setup the gopro to record from behind the truck(so i thought), it didnt record ****, which goes to show i need to go out and practice using the damn thing, because it is very much not user friendly to me apparently.





Factor in whichever % of power loss you think there is in the factory 4R100 transmission, and you see what kind of power im probably making, people like to argue so im just posting this so people can use whatever efficiency they believe the drivetrain has

By comparison, a 7.3 Godzilla on a wheel dyno pulls about 327HP, and 358 torque - Reference: Livernois Motorsports:

 

So the next question is, how much HP and Torque do we factor loosing in the Torque Converter, Trans, Rear Axle, Gears, Tires, and such.

For reference, This was with factory 3.73 gears, on 305 tires. And my torque numbers hit Fords factory numbers, but at the wheels.

Factory exhaust manifolds, factory rams horn exhaust pipe but with Magnaflow Large Truck Cat and Magnaflow muffler.

Factory intake pipe with K&N filter.

@JAck19 got the numbers live as they happened, had him on my cell, when we were all done i had to go across the street to a restaurant and chill for 30 minutes because ventilation was really bad, and i got super light headed in their dyno room, and home was an hour plus away via highway, so no un-safe driving needed.

Hence his post foreshadowing mine, lol

 

So doing some math, using various percentages of loss in the drive train, i am liking the numbers no matter which line is accurate...

 

This is great information, it will be interesting to see the results after you get the new gears installed. Those results should also give us an idea of how much was lost in the power train.
I have been following this closely, and as much as I already wanted to swap the throttle body over, now I really want to. I will be making the purchase as soon as I can.
thank you for all the great information you have provided.

 

No doubt impressive numbers, but hard to compare to factory numbers. Borderline irrelevant. Unfortunately, there’s no baseline before any tuning changes on the same dyno.

If I’m talking out of turn, light me up!

 

having driven the truck back when it was stock, and through all the modifications, i can feel the difference, the new motor, and then the SCTB were the two biggest jumps, if i had to choose a third, probably the new magnaflow high flow cat and muffler combo, but that one was more minor.

 

i actually thought it was interesting that i hit max torque at lower RPM than most, starting to wonder if that is influenced by the throttle body, and exhaust combo, more flow in and out, so it is able to hit max torque earlier, rather than taking another 500 RPM to get there.

It kinda seems to confirm mid range power gains... It also explains why its so fun to drive, im pulling that kind of torque in the lower RPM band so it makes the vehicle much more peppy and responsive, and makes it pull really nicely when you step into it.

Truth be told i was hoping for a tad more horsepower at the wheels, but I am also not disappointed either, for the torque I was actually surprised, i was expecting to loose more in the drive train to be honest, we hit the factory torque numbers on the first pull which was also a bad pull, and i was taken back happily by that development.

Going back to this i was really hoping for 290-300 hp at the wheels, but i guess that's kinda lofty, but factoring drivetrain losses using this little chart, honestly, im still happy with the accomplishment, im sure people will argue over which percentage is most accurate, but the fact that they all reflect really good numbers makes me not really care, even if you weight it conservatively, its still a win.

 

I just looked at my phone gallery and realized i recorded the first pull we did freehand right after getting it strapped down, i forgot i had done that right after walking around taking pictures, so its not a complete bust, but its crappy cell phone video, but you get to hear it, and see some of the screen.

 

So today Dauntless' rear axle got torn all apart for its overhaul, it had 2 leaks, 1 i knew about on the cover, and one at an axle seal which i didnt know about, its all apart at the shop now, factory open differential was still in there and 3.73 gears which i already knew.

its getting bearings and seals end to end, 4.30 gears, true track differential, and they are getting all that put togeather before they tackle building the driveshaft for it, they have both 4 inch and 5 inch options, once its all together they are going to assess whether 5 inch will clear everything good, i personally think a 4 inch is probably fine, but when i told them about the dyno results they decided to see if a 5 inch would clear just for extra strength.

4 inch vs 5 inch they said would be no change in cost overall, they are going to build it custom to fit once the axle is all done.

 

Since a new driveshaft is in the works, if you're currently setup with a yoke it's a solid opportunity to go to a flange