Performance pages..713hp?

Discussion in 'Dodge Challenger SRT Hellcat' started by Hellcat84, Mar 24, 2015.

  1. Hellcat84

    Hellcat84 Rookie

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    image.jpg Hey everyone, I've been lurking around this forum for a few months now, but just now decided to sign up. Got the HC in late January (ordered first day), it's Tor red a8 with Laguna sepia leather.

    Anyway, was out messing around the other day and had it in performance pages where it shows realtime hp/torque/boost/etc. and on two pulls the hp read 712 once and 713 the next time at WOT...thought that was pretty cool. Does anyone know where this sensor is reading from? Flywheel? Rear wheels? The passenger managed to get a pic but it's pretty blurry.
     
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  2. Tammie

    Tammie SRT Hellcat Moderator Staff Member Gold Supporting Member

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    Well, there are quite a few people that can answer that. Fnkychkn tsc might be able to answer.
     
  3. rayzazoo

    rayzazoo DRIVESRT.COM Gold Supporting Member

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    Any idea what the engine RPM was at the 712-713? Remember, the Hellcat is rated 707HP @ 6,000RPM... however it goes up to an electronically limited 6,200RPM. :) With tuning, 6,400RPM :) :)
     
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  4. TIGwelder

    TIGwelder SSDD

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    Probably just a math equation where 100% throttle at max shift RPM = 707hp
     
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  5. B5 Blue

    B5 Blue Platinum Member

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    Best guess is it uses the lateral acceleration sensor that's used by the ABS and calculates it within the engine module as it needs to know rpm and speed. That's how Audi used to do it.
     
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  6. Hellcat84

    Hellcat84 Rookie

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    I'm note sure, it was in auto and sport mode. I'm guessing about 6000 because that is what the shift point is set at.
     
  7. tsc

    tsc SRT Hellcat Enthusiast

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    Agree on the 707 @ 6k rpm point.. It will make more at 6250 if you run it up to there. The A8 in D mode will shift at 6k for the most part..

    As far as how it calculates, not sure. It's either a formula based on abs and/or gyro sensors, or is simply a value spit out by the ECM over the CAN bus (and calculated within the ECM). Due to the realtime nature of the reading (the gauge responds quicker in the DID) I'm guessing it comes from the CAN bus.
     
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  8. Dances With Empties

    Dances With Empties Gold Member

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    Not really up to speed with the H/C, but I'd agree with tsc; it's an ECM calculation. the CAN bus is the communication link between the systems. I would figure it takes the config of the car (performance pages) and the outside variables that it senses & formulates a rated H.P.

    I would not be surprised if someone posts that 720 "ish" h.p. got puke out on the display with the right conditions on a stock H/C...

    How accurate it is? I have no idea.......
     
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  9. Dak59RT

    Dak59RT Gold Member

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    Probably takes those various sensor readings and uses a table that correlates known horsepower ratings on the dyno under similar conditions and sensor readings. I bet it's just saying "this is what this motor does (or is estimated to do) on the dyno when it was tested under those conditions".
     
  10. Lucky Campbell

    Lucky Campbell Rookie

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    SAE dyno tests measured the Hellcat at 714 hp @ 6200, 652 lbs @ 4800, rated it at 707 hp @ 6000, 650 lbs @ 4800.
     
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  11. Paladin06

    Paladin06 Have Guns Will Travel Staff Member Hellcat Car Club Gold Supporting Member

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    I saw the same thing once when I took neighbor who has a 2012 GT500 for ride. I think it scared him he said "man get off it". :)
     
  12. rayzazoo

    rayzazoo DRIVESRT.COM Gold Supporting Member

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  13. Lucky Campbell

    Lucky Campbell Rookie

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    SAE rate hellcat at 707hp @ 6000 and 650lbs @ 4800, but measured 714hp @ 6200 and 652lbs @ 4800, the SRT handout is incorrect, it also mentioned the 6.2 is 370 CID, it is actually 376 CID, the 6.1 hemi is 370 CID
     
  14. rayzazoo

    rayzazoo DRIVESRT.COM Gold Supporting Member

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    Nice! Just saw the SAE doc and indeed, the specs mentioned above. A rather expensive document, however, it will be nice to add it to the Hellcat keepsake book. It's also nice they have the dyno graph included; though wish the document had a little bit more information.

    Now if I can just get the Hellcat built....
     
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  15. Lucky Campbell

    Lucky Campbell Rookie

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    Yes $1000 is a bit much, I live in Canada so it would be about $1250 CDN. I tried to download that screen and could not, anyone out there that can?
     

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