To Test 2015 Dodge Challenger SRT Hellcat - Page 46 - Dodge Challenger Forum: Challenger & SRT8 Forums
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post #451 of 451 (permalink) Old 02-28-2019, 06:24 AM
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Originally Posted by Lakehurst View Post
1. Black key vs red key in Hellcat: is there any difference in fuel economy? Specifically, if you are heading out for a road trip that involves a lot of freeway cruising at 70 mph, should you use the black key to improve fuel economy, or will the red key deliver the same fuel economy until you ask for more power?

2. Will existing 9" rims work with the larger brakes on the Hellcat? Specifically, will the WPA wheels work on the Hellcat?
the black key will probably pull timing and cut back fuel to limit to the 500hp threshold, so during steady state cruise or typical driving it wouldn't make much difference on the street. Even during acceleration onto a freeway, you're rarely using even 50% of the output.

I doubt the wheels would clear the 6 piston calipers - Hellcat wheels have different offsets than the wheels you mention.

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