You guys don't seem to understand what horsepower really is. It's just a way of measuring how much work is done in a specified amount of time. You can take horsepower from the engine (bhp) and that can be directly compared with other engines because it's like apples and apples. But take that same engine and put it on two different cars, say a Semi and a Mustang, you are going to get very very different rear wheel horsepower numbers. The semi is going to go way slower down the 1/4 mile than the mustang can, therefore less work done in a specified time, therefore less horsepower. A dynojet however will dyno the Semi as having the same rwhp as the Mustang because to it, the wheels spin without any resistance. This obviously is innacurate as compared with the 1/4 mile run! From what I have read, the Mustangdyno attempts to factor in these problems such as wind resistance and vehicle weight to give you an accurate hp rating down the 1/4 mile track. Which is what you want!!
Summed up, if your friends car gets the same rwhp as your car, don't expect the performance to be the same in the 1/4 mile. Weight, wind, it all matters. That's why the ET calculator has A WEIGHT FACTOR duh!
Trust me, you want the HP rating of your car as it goes down the 1/4 mile, not the HP rating of your car as it spins up the dyno.
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