Fresh off the Dyno

Discussion in 'Dodge Challenger SRT Hellcat' started by helldad, Jul 7, 2015.

  1. helldad

    helldad Gold Member Hellcat Car Club HCC Charter Member

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    Hello all!

    Here are the numbers for my stock hellcat...
    75F and raining; 6-speed manual, ~3200 miles...
    Averages - 676 rwhp, 616 ft-lbs rw.................
    I love Natasha, the White Widow... ( my car in case you didn't get it)....
     

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  2. Speedycrw

    Speedycrw Rookie

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    Wow....nice numbers!
     
  3. hellcat1

    hellcat1 Gold Member

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    I hope Me car makes these numbers
     
  4. owenspackman

    owenspackman BritishCat

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    very impressive, my 6 speed did not make these numbers. 90 degrees, 80% humidity and a 200degree motor got my 632/585.

    nice work!
     
  5. Shasta's Dad

    Shasta's Dad Silver Member Hellcat Car Club Gold Supporting Member HCC Charter Member

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    Real nice. Might try mine this weekend.:D
     
  6. hellcat1

    hellcat1 Gold Member

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    what gear did you make the pull in?
     
  7. 70Cuda

    70Cuda Yep, its got a HEMI

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    Wow!!!!! Stock..... great numbers:cool:
     
  8. helldad

    helldad Gold Member Hellcat Car Club HCC Charter Member

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    I believe it was in 3rd or 4th gear? Paul, the owner of the shop was in the drivers seat, but my max speed recorder didn't go over 141.
     
  9. owenspackman

    owenspackman BritishCat

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    It would have been 4th gear.

    redline in 4th is also high 130's so that's why it didn't increase your top speed.
     
  10. ManicMechanicMD

    ManicMechanicMD Silver Member

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    That calculates to approx. 780HP at the crank. Dodge definitely underrated this beast at 707.
     
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  11. hellcat1

    hellcat1 Gold Member

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    Ask tsc. He will know
     
  12. Driver72

    Driver72 Gold Member

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    Don't get worked up about paper numbers.
    Your car could be on a different dyno and get a peak of 620 rwhp, but be stronger than his.
    Dynos can be calibrated for "numbers queens" and spit out high numbers just to make people feel like they have a super strong one, when in fact they are just average or below. DynoJet's are by far spit out the highest numbers for number queens, but because of that, often are the least realistic.
    Just like this one. 680 rwhp? Really think that's accurate? That would be 800 crank hp with the 15% drivetrain loss. Our engine's are probably making a bit more than the rated 707 hp, but clearly no where near 93 hp more. LOL
    It's just a tool for safely and properly tuning and prior to that getting baseline "numbers" so you can see results of the tuning and other power modifications.
    Don't worry about the actual "numbers," concern yourself with the increase in the numbers that mods/tuning generate....and most importantly, the improvement in numbers you see at a drag strip and on the road.
     
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  13. helldad

    helldad Gold Member Hellcat Car Club HCC Charter Member

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    I am not sure what you mean by number queens, but I don't think this place spits out numbers to make people feel better... But it is just a baseline, that has been hit by different hellcats several times on different Dyno machines... I think 650-660 is realistic, as these were confirmed to be numbers hit by their testing by several OEM engineers, and a hellcat calibration engineer I met on the road...
    The challenger vs charger DSI game had the 2006 concept challenger that looks strikingly like the hellcat(hood scoop) and has a top engine with hp of 800... Just sayin... It is a fun game:)
     
  14. Driver72

    Driver72 Gold Member

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    By numbers queen I was referring to anybody who is so caught up on the dyno numbers that they are willing to go to certain dynos that are known to spit out high numbers just so they can say they have a "strong car" or whatever.
    Wasn't saying you were, but at 680 rwhp on that dyno, it's clear that particular dyno is calibrated to read unrealistically high.
     
  15. Driver72

    Driver72 Gold Member

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    And realistically I would say 620-640 rwhp is what the Hellcat would have.
    It's a big rwd car so drivetrain losses would be in the 12-15% range.
    If these engines really put out 730 hp, that would put the rear wheel power in the 620-640 range in ideal weather conditions with a shop that uses good fans for at least respectable amounts of air blowing into the engine, intake, and intercooler.
    Subpar fans, and hot weather, and 590-610 rwhp would probably be a realistic range too.

    Point being, no matter what individual dynos say, every one of these engines will make within 10-12 hp of each other.
    They are manufactured to a specific spec, then tested and run for 42 minutes to make sure they are up to tolerances and those specs.
    If any particular engine isn't making the minimum required power, they won't be put into a car.
    And since the specs are so close and tight in the requirements and tolerances, it's not like any particular one will have noticeably greater power (like 20 more hp) than the average.

    Hence the reason we've seen 1/4 mile results that are almost exactly the same from one car to the other if the driver is equally competent and conditions and tracks are all close to same specs.
    Meaning low 11's @ 125-126 mph completely stock for A8 cars
    10.8's @ 126 with just DR's for A8 cars.
    You don't see ANY stock Hellcats running high 10's without DR's
    And anybody who can't get low 11's on a completely stock car, it's either the driver's inexperience launching it, bad weather, a "slow" track, or a combo of all three.

    It's only the different dyno calibrations and conditions that will vary the numbers so greatly where one car on one dyno will say it has 680 rwhp and then on another dyno say it's 610 rwhp.
     
    Last edited: Jul 7, 2015
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