Technical Differences

Discussion in 'SRT Hellcat General Discussions' started by ChallengerDad, Dec 26, 2014.

  1. ChallengerDad

    ChallengerDad SRT Hellcat Moderator Staff Member Gold Supporting Member

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    I have a good friend that is a Master Technician at a local Dodge Dealership. He's the SRT Tech there, and was kind enough to give me a copy of the MasterTech Reference Book and Tech News for September 2014.
    I just got a chance to read through it (along with a TSB for Satin Paint maintenance) and noticed some very interesting tidbits of information. I thought I'd share the highlights with everyone here.

    The Hellcat block is actually based on a RAM 6.4L cylinder block.
    The engine uses a new oil pan with extra baffles and windage tray to keep the oil where needed under hard acceleration.
    The HEMI cylinder head on the Hellcat is made from a different alloy than other 6.4L HEMIs to handle the extra heat and pressures.
    The exhaust valves use a different material for the valve head.
    The IHI supercharger unit weights 90 lbs.
    The bypass valve mounted to the supercharger is controlled by the PCM and varies boost.
    The supercharger cooling system and the engine cooling systems operate at different pressures, so don't mix up the caps.
    Both cooling systems use OAT (organic additive technology) - different from previous models using HOAT.
    The OAT acts as a lubricant in the supercharger's auxiliary coolant pump.
    *Both cooling systems need to be filled using a vacuum fill device. ANY air left in the cooling system can cause it to fail.
    *The Hellcat uses an external oil cooler. The drain plug on the cooler needs to be removed to drain the oil cooler during oil changes.
    *Oiled air filters should never be used on the Hellcat.
    Doing so can foul the MAF sensor and result in incorrect airflow readings.
    There are four MAP (manifold absolute pressure) sensors mounted inside the supercharger.
    The Hellcat uses a GPEC 2a PCM, which has an onboard barometric pressure sensor, which is read by most other systems as the ignition is placed in the "on" position.
    The Hellcat uses a variable speed fuel pump. A fuel pressure sensor is mounted on the fuel rail at the crossover tube. The control module is mounted in the trunk.
    The Hellcat manual transmission has a larger flywheel, stronger clutch, and gerotor oil pump than the standard Tremec T6060.
    The Hellcat automatic 8HP90 transmission is Hellcat exclusive. It has additional clutch packs, a larger torque convertor, and uses "8&9 Speed ATF" only. A manual "park release" mechanism is installed in the console for emergency use if the car has no electrical power.
    There is no screen on the "air catcher" headlight. Air goes directly into the airbox.
    The new rear axle incorporates a 230mm ring gear that is welded directly to the carrier.
    The Hellcat rear end uses 75W-90 gear oil.
    The Hellcat uses a hydraulic power steering system. All other Challengers use an electric power steering system.
    The Active Exhaust Valves are located under the rear cradle, and are part of the exhaust pipes. The actuators (if disconnected) will prompt a "Malfunction Indicator Light".
    *The Hellcat leaves the Assembly Plant in "Ship Mode" - a low power mode to allow transport drivers to load the car "onto" the truck instead of "through" it. The dealership removes "Ship Mode" during prep.
     
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  2. RadCat

    RadCat Left Shark

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    Yes, 2 out of 3 of the blue parts are the only ones I haven't seen before. Where did he get this info? I need to confirm it.
     
  3. ChallengerDad

    ChallengerDad SRT Hellcat Moderator Staff Member Gold Supporting Member

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    MasterTech Reference Book and Tech News for September 2014. I assume they're emails or downloads. He had to print them out for me.
     
  4. Dances With Empties

    Dances With Empties Gold Member

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    I believe the exhaust valves are sodium filled. Been in the aircraft industry for ever! Remember chemistry class before you play with those...
     
  5. ChallengerDad

    ChallengerDad SRT Hellcat Moderator Staff Member Gold Supporting Member

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    Correct. They dissipate heat faster than solid valves.
     
  6. Dances With Empties

    Dances With Empties Gold Member

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    Just don't drop or cut one open if your playing shade tree mechanic... Was my point.
     
  7. ChallengerDad

    ChallengerDad SRT Hellcat Moderator Staff Member Gold Supporting Member

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    Can't speak for anyone else, but I won't be cracking the engine open until the warranty is done, and we get some new programming options.
     
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  8. Dances With Empties

    Dances With Empties Gold Member

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    Sorry, in general... Metal/ sodium fires are nasty...
     
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  9. Helldog

    Helldog Silver Member

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    Thanks for the info. Very beneficial. Cooling system makes me a little nervous.
     
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  10. ChallengerDad

    ChallengerDad SRT Hellcat Moderator Staff Member Gold Supporting Member

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    Same here. I changed out all of the plumbing in my '09 SRT8 for braided SS lines and anodized fittings. Doesn't look like I can do that with the Hellcat without a lot more diligence.
     
  11. buddyg

    buddyg Gold Member

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    Thanks for the info! What is the care instructions for the satin hood? Can you run it through the car wash?
     
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  12. hellcat1

    hellcat1 Gold Member

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    I did change my air filter to a green air fllter, It was not oily coming out of the bag like a K&N, I bought it because it flows better then the paper one from from the factory,, I hope I don't have any issues, It will be three month before I can use it
     
  13. ChallengerDad

    ChallengerDad SRT Hellcat Moderator Staff Member Gold Supporting Member

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    Actually, the TSB extends to the spoiler and fuel door as well as the satin hoods.
    They recommend NOT using an automated car wash, touching the surfaces with clean (oil free) or gloved hands, and protecting the fuel door from fuel spills with a towel.
    They also recommend not "rubbing" out water spots as this will bring a "shine" to the satin finish that cannot be removed.

    They recommend washing by hand using a soft microfiber cloth, and treating the satin paint regularly with Swissvax Opaque Paint Wax, and Dr Beasley's Matte Paint Sealant.
     
  14. hellcat1

    hellcat1 Gold Member

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    Yeah we need something for our wheels, they are horrible to keep clean... That's the biggest complaint I have about the car... I only have 200 miles and already will have to take the wheels off and clean them,,, Pain in the AZZ
     
  15. ChallengerDad

    ChallengerDad SRT Hellcat Moderator Staff Member Gold Supporting Member

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    From the TSB:
     

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