My understanding is those formulas calculate estimated wheel hp since they rely on trap speed, and E/T factors relative to weight and distance. Results from chassis dynos and time slips would represent wheel hp whereas it would take putting the engine on a engine (crank) dynamometer to get crank hp. The reason I’m curious is because there’s been some interesting discussions about driveline losses with these cars that have stirred up a lot of opinions. TwinForceFusion did a YouTube video where he used a formula to get from his chassis dyno numbers to crank numbers and there was quite a bit of dissent over his conclusions. I’ve often wondered how inefficient our driveline and accessory load really is (or isn’t). It’s all just semantics, because I’m a rock-steady believer in time slips as the final arbiter of real-world power, but I’m curious nonetheless.There are numerous “Trap Speed Calculators” available online. They’re only estimates but offer a generic perspective for comparison as one progresses thu data logging & tune revisions.
Those are some nice numbers by the way, and I like the look of your car. I’ve attached my PBs. Since they were back-to-back, I consider them validated. I’ve run higher trap speeds with different size tires but this is the best ETs. My car routinely runs anywhere from high 12.70s to low 12.40s in a single night! It’s frustrating, but I’ve learned to deal with it!