A8 Shift Light Settings

Discussion in 'Dodge Challenger SRT Hellcat' started by AZ HELLCAT, Feb 1, 2015.

  1. AZ HELLCAT

    AZ HELLCAT Gold Member

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    whoever has the A8 and is starting to get into the car and get great 0-60s and quarters what are the ideal rpm limit settings for each gear?
     
  2. B5 Blue

    B5 Blue Platinum Member

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    That's the fun stuff you figure out at the dragstrip. I'm a nice guy but when I dial mine in I ain't giving that up sorry
     
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  3. springman

    springman Gold Member

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    5750 is my #
     
  4. AZ HELLCAT

    AZ HELLCAT Gold Member

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    Ok cool guy. Lol
     
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  5. AZ HELLCAT

    AZ HELLCAT Gold Member

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    I figured first gear should be set lower because of wheel spin?
     
  6. springman

    springman Gold Member

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    Start in second
     
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  7. rayzazoo

    rayzazoo DRIVESRT.COM Gold Supporting Member

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    As a starting point,

    Edit: Had to correct for RWHP as I was originally looking for RWTQ numbers.

    2nd gear start (8HP90 auto)
    shift lights to 6,250rpm.

    2nd to 3rd 6250 / 4180rpm in 3rd
    3rd to 4th 6250 / 4970rpm in 4th
    4th to 5th 6250 / 4828rpm in 5th

    NET RWHP - 591.23 @ 6,250rpm shifts - 734 HP
    NET RWHP - 574.47 @ 6,000rpm shifts - 713 HP

    1st gear start (8HP90 auto)
    shift lights to 6,250rpm.

    1st to 2nd 6250 / 4167rpm in 2nd
    2nd to 3rd 6250 / 4180rpm in 3rd
    3rd to 4th 6250 / 4970rpm in 4th
    4th to 5th 6250 / 4828rpm in 5th

    NET RWHP - 586.45 @ 6,250rpm shifts - 728 HP
    NET RWHP - 569.29 @ 6,000rpm shifts (19.48% drivetrain loss) - 707 HP

    2nd gear start (6-speed manaul)
    shift lights to 6,250rpm

    2nd to 3rd 6250 / 4707rpm in 3rd
    3rd to 4th 6250 / 5252rpm in 4th
    4th to 5th 6250 / 4813rpm in 5th

    NET RWHP - 629.34 @ 6,250rpm shifts - 737 HP
    NET RWHP - 610.44 @ 6,000rpm shifts - 715 HP

    1st gear start (6-speed manual)
    shift lights to 6,250rpm

    1st to 2nd 6250 / 4369rpm in 2nd
    2nd to 3rd 6250 / 4707rpm in 3rd
    3rd to 4th 6250 / 5252rpm in 4th
    4th to 5th 6250 / 4813rpm in 5th

    NET RWHP - 622.79 @ 6,250rpm shifts - 730 HP
    NET RWHP - 603.46 @ 6,000rpm shifts (14.65% drivetrain loss) - 707 HP


    These numbers take in to account an automatic Hellcat dyno run and manual Hellcat dyno run. The numbers for manual and auto will be different because they are different dynos, different conditions, on different days. Based on the data below, the numbers and gears were calculated out to find the the maximum amount of NET rear-wheel horsepower produced through all of the gear runs based upon selected shift points.

    Auto Dyno run
    [​IMG]

    Manual Dyno Run
    [​IMG]
     
    Last edited: Feb 1, 2015
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  8. Top Cat

    Top Cat Gold Member Hellcat Car Club Gold Supporting Member Fastest Cat/Record Holder HCC Charter Member

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    You need to shift higher so that the car stays in it's power band.
     
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  9. tsc

    tsc SRT Hellcat Enthusiast

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    Not that I use the shift lights too much, but I have all of mine set at 6250 RPM. Dyno graphs show the power curve still climbing all the way up to redline, so why shift early? The black Hellcat that ran 10.4 was able to do so by shifting manually exactly at redline, rather than letting the car do it for you in 'D' which will shift a few RPM shy of redline.

    Now keep in mind, using this on the street will not allow you to stay at legal speeds. :)
     
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  10. Top Cat

    Top Cat Gold Member Hellcat Car Club Gold Supporting Member Fastest Cat/Record Holder HCC Charter Member

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    Remember, torque gets mass moving and HP keeps it accelerating, you need to stay in the HP power range.
     
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  11. Top Cat

    Top Cat Gold Member Hellcat Car Club Gold Supporting Member Fastest Cat/Record Holder HCC Charter Member

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    I think you'll find that the car that ran the 10.48 also shifted in the 6200 range, nitrous or not the engine likes to breath with the blower.
     
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  12. rayzazoo

    rayzazoo DRIVESRT.COM Gold Supporting Member

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    I like how the engine is rated at 707HP @ 6,000rpm but it is around 728-729HP @ 6,250rpm!
     
    Last edited: Feb 1, 2015
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  13. The Max

    The Max Gold Member

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    Thank you for all of that info. Would have thought 1st gear should be better for accleration.

    Guess when more people get their Hellcats, the closer these cars will be in the 10 sec 1/4 mile range.
     
  14. RadCat

    RadCat Left Shark

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    Sure if you can get traction...which we can't. If we had some fat, wrinkle-wall slicks and a chassis setup that would carry the front wheels 10" in the air for the first 60', then first gear it is!
     
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  15. Tammie

    Tammie SRT Hellcat Moderator Staff Member Gold Supporting Member

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    This is awesome info. I am going to try this with my manual in custom setting track mode with sport suspension and 6250 rpm starting in second. I'm thinking that will help with wheel spin. If the darn roads would stay dry long enough to figure it out!!o_O
     

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