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Thoughts on DCT

Discussion in '2020+ Shelby GT500 Mustang' started by PowerWheels, Jun 26, 2019.

  1. GTSpartan

    GTSpartan Yield right!!!! Established Member

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    FWIW, those that are saying the drivetrain losses are significant between the DCT and a conventional auto is not really accurate. In fact, they are typically very close, and are both still a good bit behind a three pedal manual. Remember, a DCT has and extra input shaft that is turning 100% of the time, and don’t forget the pumping losses due to the wet clutch setup as well. Let’s not confuse a DCT with a sequential here. BIG difference between the two.

    Also, the GT500 engine is SAE certified against the same J1349 standard that several other automakers rate against, so don’t look for some hugely underrated motor. As always, there will be a safety margin, but don’t expect 800hp engines to be released by the factory.
     
    Last edited: Jul 16, 2019
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  2. LostM

    LostM Well-Known Member Established Member

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    16 % for dct
    Bmw s65 rated at 420,dynos 390

    If a demon can hit 140 in perfect conditions, so can a gt500
    If Demons realistically trap 135-137 , so can a gt500
    The numbers are there.
     
  3. GTSpartan

    GTSpartan Yield right!!!! Established Member

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    I think some of you guys that are holding out hope for a 140 trap will be waiting for a loooong time.

    The Demon is 100% optimized for the 1/4 mile, at the expense of everything else. As far as I know, only a single 140 mph run was ever achieved.

    It would be awesome if it did, but we may be setting the bar to a level that can't possibly ever be reached. Ford GT stomping road course times + Demon 1/4 mile performance just doesn't compute. Especially at 4K + lbs.
     
  4. LostM

    LostM Well-Known Member Established Member

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    It seems people have an issue with comprehension.

    H.E.R.O. RUN
     
  5. gofast15

    gofast15 Active Member Established Member

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    I have seen around 15 Demons run so far as I go to local tracks very often , the highest trap I've ever seen was 134mph and that was in negative DA . Most of them run 131-133mph in race trim
     
    Last edited: Jul 16, 2019
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  6. gofast15

    gofast15 Active Member Established Member

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    It would be pretty cool if Ford made adjustable RPM launch control . Most likely it won't happened but hopefully tuners can get this figure out shortly
     
  7. LostM

    LostM Well-Known Member Established Member

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    I agree, stock Demons are dissapointing, at atco, mir and Cecil, the 3 fastest tracks in the world, thats why I said IF

    I would be suprised if they didnt have rpm control, in 500rpm increments
     
  8. gofast15

    gofast15 Active Member Established Member

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    I'm wondering if Ford programmed any kind of trans/ engine protection when the car is cold . Trans temperature had to reach 140*F in my GTR for the launch control to work , which was annoying at the track . LC works in my R8 even if it's cold but the computer limits engine rpms to 6500 when the car is cold , it's very short timing like 1-2 minutes then it goes to standard redline
     
  9. gfcobra04

    gfcobra04 Active Member Premium Member Established Member

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    The math:
    390/420=.928-1.0=.072
    That is 7.2% not 16%. 16% loss is approximately 353 not 390.
    Correct?
     
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  10. LostM

    LostM Well-Known Member Established Member

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    Your right, my post was wrong, 350hp
     
  11. gimmie11s

    gimmie11s Dont be a Hybred Established Member

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    Lol I’m not mad at all! Just having fun bench racing.

    None of this matters until the car comes out.




    Sent from my iPhone using the svtperformance.com mobile app
     
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  12. tt335ci03cobra

    tt335ci03cobra Well-Known Member Established Member

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    Most vw group dct and dsg stuff loses around 30whp in ff setups, and 40whp in awd setups.

    The dct in the gt500 is a big boy, as is the driveshaft, and it’s turning 28” tall rears.

    One other thing, the carbon wheel gt500 will have less drivetrain loss and sits lower. Just removing the wing and dive planes on a carbon equipped car should be a recipe for the quickest gt500 for rolls. I bet that would reach 180mph very quickly.

    Cofd and whp dictate top speed and trap speed far more so than lbs/hp.

    Look at a few oddballs throughout history. The 4500lbs 510hp Ram SRT was trapping 103-107 auto-manual meanwhile the auto only charger at 4500lbs runs almosg 115mph in scatpack guise with 485hp. That’s do to rotational mass in the wheels, drag coefficient, and the a8 ratios.

    Here’s the 4500lbs quick silver single cab going 107mph with a 6spd auto and 470hp and they talk about an srt10 Ram

    Ram 392 Quick Silver Concept First Test - MotorTrend

    I brought up cofd a few days back and again, .05 matters a lot. This truck is something like .45+ meanwhile the charger is .35, the 200lbs difference between this truck and a charger scatpack isn’t eating up 5-8mph at the strip

    2019 Dodge Challenger R/T Scat Pack 1320 Review: A Singular Mission - MotorTrend
    This 485hp challenger does 115 with a transbrake, a8, weight pulled, kill mode, hero run.

    A loaded 4K lb auto 19 gt can trap 120 with 460hp. 300lbs isn’t 5mph at these levels.

    Take 300lbs out of a Miata and it’ll be noticeable though. It’d be about 12.5%. 300lbs our of 4300lbs is maybe 7%
     
    Last edited: Jul 17, 2019
  13. LostM

    LostM Well-Known Member Established Member

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    i would need to see the drf file itself, or a more clear image of the dyno for accurate plots
     
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  14. Wilson & Co

    Wilson & Co SnakeJockeyExtraordinaire Established Member

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    Looks like 3200 max launch rpm from the latest goodwood video.
     
  15. DBK

    DBK Re-retired Established Member

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    Time of day. Ford, who is historically terrible at virtually everything related to marketing and communication, allowed the car to be tested in the heat of the afternoon when it was apparently 20* hotter ambient then when the 720S ran, and the 17 calibration pulls lotsa power fast in high heat. Billy drove the course 2:38.6. Yeah, that's a pro, but journos aren't 7 seconds off.

    In a very fruitless and repetitive discussion, I always explain to them that it's better to just say **** off and not let a car be tested unless there is some kind of equivalence between testing conditions. Nobody sees who is driving (which varies) or what the conditions were when they did it, just the number. Then Ford is like "no trust us, we've got this!" and slams their dick in the door while slashing the car's tires and lighting themselves on fire. Later, they award themselves a trophy.
     
  16. LostM

    LostM Well-Known Member Established Member

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    means nothing if its controllable. street tires and 5500rpm wouldnt be smart
     
  17. Dusten

    Dusten Well-Known Member Established Member

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    While I don't disagree,based on his burnout he didn't care
     
  18. Wilson & Co

    Wilson & Co SnakeJockeyExtraordinaire Established Member

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    Yes understood. My point was that it appears to be adjustable based on 100 or 200rpm increments and max out at 3200.

    And that if one were inclined to get best 1/4mi ET on sticky tires, would need to tune that parameter.
     
  19. LostM

    LostM Well-Known Member Established Member

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    but what gives you the impression it was maxxed out?
     
  20. Wilson & Co

    Wilson & Co SnakeJockeyExtraordinaire Established Member

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    Because in the video, he says as hes pushing the adjustment button "launch rpm set to max" and the screen shows 3200.
     
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