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Supercharged Hemi: more power?

by David Zatz on

Allpar has been reporting on the development of the supercharged 6.2 Hemi for many months now, and estimates of its power have varied over that time. We were assured that it was supposed to have 700 horsepower, but we’ve been down that path before with the 6.4 (600 hp rumored, 470 hp reality) and other engines. It’s hard to tell how much is initial optimistic expectations, how much is first-run dyno figures (cut back later as things like alternators, pumps, and oil pans are added), and how much is going from gross to SAE net horsepower.

For the 6.2 Hemi, therefore, we took 700 horsepower, subtracted an abritrary 60 for gross-to-net, then another 60 for changes to make sure the engine can last the now-standard 200,000 miles under the crazy conditions to which owners will subject it.

We have been told by several sources now that our estimate of 580 horsepower is quite probably too low; the internal target is 700, and while we don’t believe the target will be reached when they get around to publishing SAE net figures, it’s beginning to look as though it’ll beat 600 horsepower. (It’s unclear how internal targets are measured.)

As for torque, based on the capabilities of the ZF eight-speed automatic we know this engine will be hooked up to, we’re estimating a peak 640 pound-feet. That would keep the engine well within the theoretical capability of the transmission.

Insiders say the engine has variable cam phasing, as the 5.7 and 6.4 do, and uses the 6.4’s heads.

The engine program seems to be successful, with talk of supercharged 6.2s in other cars than the 2015 Dodge Challenger, and perhaps even the comeback of the SRT Ram.  The company doesn’t plan to build many of the engines, though.

David Zatz founded Allpar in 1998 (based on a site he had begun in 1993-94), after years of writing reviews for retail trades. He has been quoted by the New York Times, the Daily Telegraph, the Detroit News, and USA Today. Before making Allpar a full-time career, he was a consultant in organizational psychology. You can reach him by using our contact form (much preferred) or by calling (313) 766-2304

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