{"id":66305,"date":"2022-11-12T08:47:01","date_gmt":"2022-11-12T13:47:01","guid":{"rendered":"http:\/\/www.dodgegarage.com\/news-api\/?p=66305"},"modified":"2024-03-25T11:20:14","modified_gmt":"2024-03-25T15:20:14","slug":"a-look-at-how-dodge-measures-engine-power-under-sae-standards","status":"publish","type":"post","link":"https:\/\/test.api.dodgegarage.com\/news\/showcase\/2022\/11\/a-look-at-how-dodge-measures-engine-power-under-sae-standards.html","title":{"rendered":"A Look at How Dodge Measures Engine Power Under SAE Standards"},"content":{"rendered":"\n

Over the past seven years, the Dodge brand has issued a collection of the most powerful production cars to ever grace the road. It started back in 2015 with the 707-horsepower Challenger and Charger SRT\u00ae<\/sup> Hellcat models. For 2018, the Challenger SRT Demon set the standard for power by which all American performance cars are compared, packing 808 horsepower on pump gas and 840 horsepower on 100-octane racing fuel \u2013 numbers which still haven’t been matched by any other American road car. For the 2019 model year, the original SRT Hellcat models climbed to 717 horsepower while the Challenger SRT Hellcat Redeye debuted with 797 horsepower; and for 2021, the Charger got the Redeye treatment as well. Most recently, the Challenger Super Stock and Redeye Jailbreak models for Challenger and Charger each got official ratings of 807 horsepower. Even the roomy Durango has gotten the big-power treatment with the 710-horsepower SRT Hellcat model, further securing Dodge\u2019s title as the American horsepower leader.<\/p>\n\n\n\n

Regardless of which supercharged Dodge vehicle you drive, the odds are good that if you had the vehicle tested by an independent dyno shop, your Challenger, Charger or Durango made far more power than you expected. Many people like to use a drivetrain loss factor of 15%, and when you apply that relatively conservative number to dyno results, you will almost always get a much larger number than the official power rating. For example, my stock 2017 Challenger SRT Hellcat made 644 horsepower at the rear wheels on the dyno. If you add back in the assumed 15% drivetrain loss, that leads to a crankshaft number of 757 horsepower. Drivetrain loss of 15% on 707 horsepower should be around 600 horsepower, while 644 horsepower represents a loss of just 9% from the crankshaft to the wheels.<\/p>\n\n\n\n

So is the output of my 2017 Challenger SRT Hellcat grossly underrated from the factory? That is what many people like to think when they see that their Dodge lays down much bigger dyno numbers than expected, but that isn\u2019t the case. In reality, the difference in what Dodge advertises and what third-party dyno shops see in terms of calculated horsepower is due to a very different method of testing and today, we bring you a look at the details of those different testing methods.<\/p>\n\n\n\n

Testing on a Shop Dyno<\/strong><\/h2>\n\n\n\n

If you have never been to a performance shop that has a dynamometer (dyno for short), the video below shows a pretty average dyno pull for a performance shop. As you can see, this is a mobile chassis dyno that has been moved to the Modern Street HEMI\u00ae<\/sup> Shootout parking area at the Woodward Dream Cruise, but this is the same dyno used by Livernois Motorsports at their shop and it is the same type of dyno that is in use in many shops around the country.<\/p>\n\n\n\n

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