[mkcobra]

mr fixit,
i would whole heartedly disagree,

Nascar uses chassis dynos regularly , Dynojet is the offical Nascar dyno. they have units that will go to 1200hp , i know i have one. as for load testing they even have setup that will apply differential load so you can check for load related problems, yes the wheels have to have traction but remember you are not starting from a dead stop. this is done from what is called a roll on traction is less of a problem since your car is in 4 th gear or which gear gives your axle 1:1 ratio. we have had 700hp drag cars and no tire slipping. this is even with shooting nitrous in the middle of the run. you should check into the chassis setup first i think you will see it is used more than you think. as for tuning either can tune you motor. but if its installed why do you need to pull it out and make adjustments, second you can use the exact exhaust setup for better tuning not just headers attached to pipes. You can quickly make changes in the car and see results even after you did your engine dyno work. engine builders like engine dynos simple tool for their requirements. they dont care what car it goes into or what tranny it bolts to. every car tuner uses chassis dynos they dont what to pull the engine everytime they need to modify a car and still can prove gains or loss. not a flame war but over the last 4 years we have modified and tuned cars that no one would ever consider pulling the motor out to do. prime example when you supercharge an new vette (LS1) it has to be tuned under load for Fuel recalibration and timing . who would pull the motor after they just installed the supercharger . it bolts to the car not free standing. make some adjustments and then drive it home. went from 422 rear wheel HP to 472 Hp with a simple test run and LS1 edit software. just letting you know its not hype and a piece of paper. looking forward to commentary.