Lets assume this gentleman was geared at 3.73, would he have better results if he was geared properly for 35 inch tires?

[Dustin Jackson]

This guy dino'd is 5.3 at 281 HP

 

[swathdiver]

Definitely, mine is stock with a tune and makes more power than that. That's also "dyno" power and every one of them reads differently.

Every additional pound of rotational weight is equal to 8.4 pounds of static weight added to the vehicle.

My 35s add 44 pounds per wheel over stock. That equates to 1,478 pounds added to the weight of the truck and my timeslips prove it.

The only way to know how the actual rear wheel horsepower of the truck is to make a few passes down the quarter mile.

 

[Marky Dissod]

Lets assume this gentleman was geared at 3.73.
Would he have better results if he was geared properly for 35" tires?

If this question assumes that 3.73 is proper gearing for 31.6" tires, then the question is making a faulty assumption.

3.73 is undergeared. Lesser gearing is undergeared even WORSE.
GM undergeared most V8 vehicles to appease CAFE MpG targets. We have all been accustomed to undergearing.

There is no question 4.10 or 4.30 or 4.56 would improve his quarter mile performance, both elapsed time, and trap speed.
I thought dyno results are supposed to take under- or over-gearing into account.

 

[Dustin Jackson]

If this question assumes that 3.73 is proper gearing for 31.6" tires, then the question is making a faulty assumption.

Not making an assumption, I’ve never seen someone dyno a truck on large tires so my question was more to find out if a vehicle will dyno the same about of HP if they are geared properly for 28 inch tires or 35 inch tires.

In my mind there has to be some sort of energy loss as you increase tire Diaz’s and gear ratio or else you could theoretically increase your tires size and gear ratio infinitely and your HP and Torque would stay the same with 1000inch tires but that seems unlikely

 

[Marky Dissod]

Did not say YOU made an assumption. It's splitting hairs, but I split them for a reason.

Larger heavier tires (nevermind larger heavier wheels!), a heavier transmission built to tow / haul heavier loads (4L60E vs 4L80E) ...
We're talking parasitic losses, not just static inertia, but rotational inertia too.

... there has to be some sort of energy loss as you increase tire diameter and gear ratio, or else you could theoretically increase your tires' size and gear ratio infinitely, and your HP and Torque would stay the same with 1000inch tires but that seems unlikely.

Yes, of course, if the static and rotational inertia increases, power through the tires / to the ground gets worse.
Increasing axle gear only to counterbalance the lesser gearing of taller tires', there are 2 reasons why OE gearing is insufficient:
1) Yes, you are absolutely right, bigger tires 'weigh' more, statically AND rotationally, they cost more power to turn.
If you merely aim to restore OE gear ratios, heavier (wheels and/or) tires will always cost more power to turn
Aiming for
3.73 with 31.6" tall tires
absolutely fails to account for the increased inertia of taller tires; more power 'absorbed' by the tires, less power to move the vehicle.
AND FURTHERMORE
2) 3.73 was barely enough axle to begin with using 31.6" tall tires - anything less would be even worse.

Starting with
4.10 and 31.6" tall tires,
using 35" tires would mathematically require a 4.88 axle ...
but I'd recommend EVEN MORE AXLE.