Quote:
Originally Posted by Speedofsound
So how does a 435hp car dyno 370whp on a dyno and a 460hp car dyno 437whp on the same dyno and they're 20hp apart.
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Lol. A dyno from 2 years apart ? Were they in the same gear. Same gear ratio. Air pressure in tires. How tightly strapped down. Conditions of the day. Operating temp of the engine. Weight of drivetrain/efficiency. Driveshaft and half shaft weight. Fluid viscosity. Dyno calibration and or correction. The list of variables is ridiculous
VS
A controlled environment directly measured at the engine.
I’ve seen my own cars on the very next pull change by 8 rwhp for no reason. A rear wheel dyno is just a tuning tool. Most shops will do money pulls as well. Let the car sit for an hour. Fire it up cold and produce a pass about 10 rwhp higher. Was that done with every car compared ? There’s too many variables
Hennessy had the new SS at 43x rwhp as soon as it came out as well. Seen Scat pack autos in the 43x range.
Manufacturers are making everything more efficient. A huge chunk of this is an efficient drivetrain. Which = less hp losses with every new model. Not under rating of the engine.
Even compared side by side with a 15 model I’m sure it could show possibly more than 25 hp gain. But there’s 100 reasons why other than the engine being under rated