Different track, different conditions, different surfaces, different builds, different trucks, different drivers, different elevation, different weather conditions, different everything i guess..
What I dont get is how 541 hp on a dyno turns into 480..
Let's keep this simple so even a Canadian can understand.
1. The 541 was an actual dyno reading on a DynaPack. The rear wheels are removed (you probably missed that while watching the video) so I wasn't spinning over 180 lbs of rotating mass. It was the race tune, on race fuel (not a 91 octane street tune). Sort of like how an engine on an engine stand will make more horsepower than the same engine, installed in a truck or car will make less horsepower because of drivetrain loss.
2. It's 485 not 480. It was on a Dynojet (different dyno). It was on pump gas, 91 octane. It was the street tune, not the race tune. So big difference.
3. Different dyno, different day, different weather conditions, different tune, different gas, not spinning the heavy stock wheels and tires, different everything I guess.....you answered your own question.
4.So let's see what I'm really making and how that makes you feel. 485 rwhp times .92 (your precious 8% for your Mustang dyno) gives me an actual , for real number of 446.2 rwhp. Now I have a truck with a stock engine that makes 446.2 rwhp to your $20,000+ dollar built motor that makes at least 120+ (if you're at 560 on your precious Mustang dyno) and you ran a whole Earth Shattering .12 (twelve hundreths) of a second quicker. Money well spent! I don't think my light weight reductions and a pair of slicks cost even 15% of what you spent.
5. Now I have a truck making less horsepower than just about everybody else on the forum ( I think everybody makes more than 446 rwhp) and with just some simple weight reduction, which on Monday after a race no one can tell my truck has ever been modified (weight wise)....and I'm almost 2-3 seconds quicker than everybody else except Justin, Rick and Scott. I don't know how I do it. Maybe after I break the NA record I will never run the 1/4 mile again.....makes sense to me. If I had a truck run 11.51 @ 121 on street tires at full weight I would never run it again either.