I know of a Cam/heads/fast intake LS1 that put down 445hp at the wheels. As I said before, there a lot of variables, but in a lot senses they are acurate. I have seen magizine articles where 150 shot put down 200 hp at the flywheel. I've also seen less hp on the same shot. Every engine is different.

 

Thats not THAT far off of you though, you have the 4l80e trans as well as the 14 bolt rear end, and 2 piece driveshaft. All this stuff is going to make the rwhp much lower than the crank hp would be. If you had the 10 bolt 4l60e combo you would be closer to a 20% loss, but the 80e is worth another 3% on its own over the 60e. The Allison is running a 27%-29% drivetrain loss, same as the 5 speed auto Dodge Ram trans.

Using a 25% correction for your truck I get 520 crank hp from your 416 rw, that 478 rwtq becomes 596 crank tq.
Using a 20% correction factor it becomes 5000 crank hp and 573 rw tq. The 25% drivetrain loss would be more accurate for your 2500 series truck.

There are obviously a lot of variables but for your 2500 series truck, but 30 hp for just punching in numbers is pretty close, who knows excatly how accurate the dyno was either????

peace
Hog

 

Im not sure if this would affect the number either, but here we go. Like in DanaliHD'd, case, he dynoed in 2wd, but runs 4wd at the track. I think that with the extra traction that he gets from the 4wd could through off his mph numbers inturn it woudl affect his calculated rwhp numbers. Does this sound like a viable reason or not???? Please tell me if it doesnt. Its late and I am just shootin from the hip here

 

don't most of the HP calculators tell you rwhp? I'm sure i am over 500fwhp.

 

HP calcs are not just rear wheel hp it is hp to the ground to be specific. And yes the drivetrain losses would be greater running in 4wd vs 2wd.

 

What was your 60' on your 12.58 @ 109 run?

 

424 on motor? That is VERY optimistic. That is about the norm for a heads/228+cam/M6 fbody with a good tune and supporting boltons. Auto are usually around the 400 mark. Hard for me to believe a cam only LS1 in a truck with a 80 is putting that to the wheels. Just for referance, I am looking to get around 380/400 with my h/c ls1 thru a built 65.

 

That's what I thought too. Guess I'll just have to put it on the dyno and see.

 

the calculation doesn't work for me either

 

60' 1.7x I think. I was launching pretty easy.