Why does the Jeep Grand Cherokee and Dodge Durango 5.7 Hemi make less power than Chrysler's other vehicles with a 5.7 Hemi?

Question

Google seems to malfunction when I type this question in. I noticed how the 5.7 Hemi in the Grand Cherokee/Durango make 360 HP while the Dodge Charger/Challenger make 370 HP. The RAM 1500 makes 395 HP. Why not just keep them all at 395 HP? Does it have to do with emissions requirements on certain types of vehicles?

Answer 1

The Ram's 395hp 5.7L Hemi engine is new/heavily revised and features variable valve timing among other improvements to increase output. The older version of the 5.7L Hemi doesn't have variable valve timing (or the other improvements) so that's why those make less power - they're an older design.



As to why the older design is rated at 360hp in the Durango/Grand Cherokee but 370hp in the Charger/Challenger, there could be a couple of possible reasons. A simple reason could be that the redline is set a little lower on the "truck" engine than the "car" engine - if one engine is limited to a slightly lower redline and the engine makes its peak power near redline, one having a ~250rpm lower redline could be the difference in 10hp output. A more complicated reason could be that the 2 engines are almost mechanically identical but tuned slightly differently. The "car" version might be tuned for slightly more top end power while the "truck" version might be tuned for slightly more low and mid-range power at the expense of 10hp on the top end. Emissions probably has little to do with a 10hp difference because 10hp one way or the other isn't likely going to push them over the edge on emissions.

Answer 2

Displacement may be the same but intake/exhaust design along with vehicle use and tuning is different. hence they have different output numbers.



They have to design some parts of the engine so it will fit in that specific body style, along with be a "good" engine for the type of vehicle. Someone buying a truck will want more HP for hauling loads over someone buying a Grand Cherokee who wants low end torque for everyday use.



Also, 5.7 is just a common displacement for Chrysler vehicles. they all have different designs, hence you can't take a 5.7 out of a Charger and make it a direct swap into a Ram or Grand Cherokee.

Answer 3

the suvs are tuned down through the computer and the charger and rams dont share the same motor the rams is built for work but they are both 5.7 hemis

Answer 4

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Answer 6

Hi tuning and engine management systems are the reason.