How The Dodge Demon Launches: Transbrake + Torque Reserve Explained
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- čas přidán 5. 08. 2017
- How Does The Dodge Demon's Transbrake and Torque Reserve Work?
How The Demon Hits 60 In 2.3 Sec - • How The Dodge Demon Hi...
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IMPORTANT NOTE - The throttle is located before the supercharger, unlike how it is drawn in the video. This doesn't really change much, you will have pre-filled 8 psi of boost past the supercharger, but the drawn location of the throttle is incorrect. You can clearly see the throttle comes first at 1:37 in the video. Apologies for any confusion, hope everyone's having a wonderful day!
From The 2018 Dodge Demon Press Kit:
"TransBrake is a production car first. Every Dodge Challenger SRT Demon is equipped with the standard TorqueFlite 8HP90 eight-speed automatic transmission. Already a proven and robust gearbox used with the HEMI Hellcat V-8, the transmission gets some significant changes for duty in the Challenger SRT Demon.
Internal changes include an upgraded torque converter that delivers an 18 percent increase in torque multiplication. Also, the stall speed is increased 11 percent and the lockup speed is increased.
The Challenger SRT Demon is the first-ever, factory-production car with TransBrake, which locks the transmission output shaft to hold the car in place before a standing start. This lets the driver increase engine speed up to 2,350 rpm without overpowering the brakes, resulting in quicker power delivery and up to 15 percent more torque at launch.
Driver-oriented step-by-step instructions are displayed on the instrument cluster to guide the driver through the staging process and help them keep their focus on the Christmas Tree.
The TransBrake helps to improve driver reaction time and launch consistency by using the steering wheel paddle shifters as a launch trigger - a paddle launch improves reaction time by 30 percent compared with a foot-brake launch. In addition, the system enables delivery of initial torque to the flywheel as soon as 20 milliseconds after launch.
TransBrake works in conjunction with another SRT Demon first-ever factory-production car feature, Torque Reserve, to deliver increased levels of power and torque at launch.
Torque Reserve becomes active once engine speed passes 950 rpm. It does two things:
1. Closes the bypass valve, “prefilling” the supercharger with boost
2. Manages fuel flow to cylinders and manages spark advance or retard to balance engine rpm and torque
With TransBrake and Torque Reserve active, the SRT Demon has more than 8 psi of boost at launch and up to 120 percent more engine torque than without Torque Reserve. TransBrake also preloads the driveline with torque, leading to full engine torque delivery at the rear wheels 150 milliseconds after the shift paddle is released. That results in faster acceleration at launch, faster 60-foot times and an improvement of more than a tenth of a second in quarter-mile times, which can be an entire car length."
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IMPORTANT NOTE - As +177SCmaro has pointed out, the throttle is located before the supercharger. Doesn't really change much, you will have pre-filled 8 psi of boost past the supercharger, but the drawn location of the throttle is incorrect. You can clearly see the throttle comes first at 1:37 in the video. Apologies for any confusion, hope everyone's having a wonderful day!
Engineering Explained Can you make another video explaining the trans brake? Would really appreciate it.
Transbrake explained from 2:46. It's not really any different than any other automatic transmission, just engages two gears at the same time.
Engineering Explained Ok thanks for replying i have been a very early subscriber. Its been great to see you grow so rapidly. Have you done mechanical engineering ? I also have a passion for cars and engines and am also pursuing mechanical engineering.
About the transbrake... Is the statement "pre-loads the drive line" (at 05:27) not entirely correct as engaging 2 gears simultaneously locks up everything from the transmission forward - leaving the drive shaft, differential, and half-shafts (basically 50% of the drive line) unaffected?
Does the car have a 2-step to hold the rpm's in that torque reserve window?
I love how Dodge built this specialized car.
Doug is the type of guy to... oh, wait, wrong channel
Dmitry L 🤔 I have seen you there...
I clicked on this video the moment I saw it uploaded faster than the Dodge Demon's 0-60 lol
Nice video. I appreciate the enthusiasm and coverage of domestic cars as well as imports.
Great video! It's been really cool watching your videos improve and learning all the while. Very impressive as always Jason, keep up the great work!
I can’t thank you enough for this video. This is the greatest time to be alive. Watching a drag race wondering how the hell it launched that fast, reading comments, see trans brake, see your video. Who could have that information that fast and that quality?
Wow. Good rundown. Dodge did some good work preparing this vehicle for the strip...
Love your videos! Have you thought of doing any motorcycle content? I would love to see your style of video talking about the new technologies coming in sportbikes these past few years.
Could you do a video on how the Honda Accord Hybrid system works and how it gets mileage as good as a Prius even though it's almost 2x the size?
Well explained. Thanks for the lesson.
You're the best!! Keep the good work
That supercharger is bigger than my engine. 800cc to be kinda exact.
0.8 liter? Motorcycle?
800cc bigger than my engine. Its an 1.9.
Oh, okay.
It's 1600cc bigger than mine
Nice explanation. I never knew how drag racers did it.
You've done a lot of videos on this particular car. I want to see what its cornering abilities are! :p
ZERO. That’s your video. It’s a DRAG car.
Can you do some 2017-2018 car reviews
Nice explain!
Miss your car reviews. Any plans to start those back up again?
Getting a 2-series in tomorrow, probably doing a review with it! :)
EE, thank you very much for all your videos and tutorials. My question, Which one is better for fast launch, using electric motor to move the wheels or using trnas-brake with torque reserve?.... cause I drive a V6 hybrid and I noticed it launches faster than any other Gas vehicle when the traffic light turns green.
Every time he says, “Hello everyone, and welcome,” I hear it in Alex from Car Throttles voice mocking him. Lol
hi jason,can you do review of 4X4 A/T tires and which is the best A/T tires for on road and off road list of are silverstone,toyo,bridgestone,coopertires,yokohama and others thank you
An 800-some horsepower Demon rocketing backwards unexpectedly would not be good.
Like your CZcams channel lots of good info. I have a idea for a video or video series. You could do engine info and operation on common engines like the 4.0 V6. The 4.0 V6 is in the Toyota Tacoma, Nissan Frontier, and others . Jeep had a 4.0 inline 6. I think it would be interesting and people would learn a lot information. What do you think?
How long can you sit with the trans locked up before you build up too much heat? Do they have a special cooling system for the trans fluid if you want to do back to back runs?
Now I want to know the drag times with and without this system enabled
1st question - Does the torque reserve only available for the dodge challengers with superchargers and not the dodge challenger scat pack 1320 even though that has a trans brake?
2nd question - What is difference between boot brake and trans brake on the dodge challenger? I understand the controls as in trans brake uses paddles vs foot brake but as in what is the benefit. Does foot brake do the same thing as trans brake as put torque to the wheels right before launch?
Is this technology/method proprietary or do you expect other manufacturers to release their own version on their performance cars? Factory drag cars coming back is very exciting.
Not even notification squad
The car is missing a pedal. The most important piece of engineering info.
How much torque can this transbrake handle? And at what rpm?
so by using this can i also improve my acceleration when i come out of the corner .. while i m driving on a race track
waithing for your reply
TYVM
So you have to control the throttle input with the transbrake on? I thought it was full throttle and the computers controlling the RPM.
And also, can you use the transbrake in second gear? I remmember that Motor Trend said that the automatic Hellcat is faster from 0-60 launching it from second gear, and I have the doubt, can the Demon do a faster 0-60 launching it from second gear?
I wonder if Dodge put a special valve body in the 870RE. If not, this feature can theoretically be exploited by afkermarket tuners and applied to all 8HP equipped cars. Imagine an all wheel drive Audi launches with line lock at driveshaft snapping speed!
@Engineering Explained Can you please make a video about KoVoMo engine from Porsche. It's a V8 petrol engine. Many Thanks in advance.
how did u get those informations .. That Was Awesome !
Spoke directly with the engineer responsible for powertrain development on this vehicle, as well as the lead engineer for the transbrake (he actually was the one to teach me how to drive it). Great information indeed, glad you enjoyed it!
Só esse motor já é mais lindo que qualquer carro popular
Hey I'm also from Boise Idaho and I was wondering if you go to cars and coffee and/or the cruise or anything car related locally. It would be a complete honor to shake your hand and meet a person I never thought I would. Either way I've been watching your videos for so long I can't even remember and still find your videos entertaining. I've learned a lot from you, keep it up
P.s if you see a green sc300 with bride seats please let me take a picture with you
Ha, I haven't been to C&C Boise, didn't even know about it honestly. But if you seem rolling around in the yellow S2k, feel free to flash those lights and I'll say hello!
go to boise's "the spotted group" on facebook it keeps you pretty "in tune" with the local car scene and meets and such.
Idaho terminology:
butthurt
"I own a subaru"
Man do a video talking about spark plugs, I don't know if you have one already but will be a good one! Sorry I'm off topic but I don't see where sent you a message
hmm you do mostly car related videos. so i was wondering if you know anything about audio, well in this case car audio ;) cuz if so id like to make a request :D
If you buy a factory built race car, do they still come with a warranty? And if you race in it, does that void the warranty?
Hey Bro! Could you say "Hello welcome and everyone" in your next video"?
This isn't Shmee.
Noah cross I know It😔😔
The next generation dodge vehicles are going to me insane! Lighter and faster!
So what electric cars might be faster than this? The complexity and actual mechanical design rather than just some batteries is why people like these
exactly, i'll take a complex v8 any day over an electic car.
Hi Engineering Explained! I really appreciate your videos and I was wondering if you could do a video solely on how a VELOCITY STACK intake system works. I'm a 16 year old kid who just wants to learn more! I think cars with those trumpet looking thingys sticking out of the engine sound so good! PLEASE LIKE SO THAT GUY CAN SEE THIS! THANKS!
So does it make sense to add force induction on an engine with ITBs? Does it work, is it more efficient for power increase or no?
Leslie H. I do not know as much as EE but I think it's very very hard/ impossible to do forced induction with independent throttle bodys. I may be wrong but I don't think you can have open throttle bodies on each cylinder and put boost into them. Just trying to help awnser your question!:)
Then what about a 4A-GE 20V? In some variations some people boost them with ITB.
theog gus you can with ITBs' e.g GTR R34 has a RB26DETT with 6 itbs for forced induction on ITBs' you need to link them with a common manifold
Leslie H. Well prime examples of forced induction cars with ITBs' are the Nissan Skyline GTR (R34) which has a 6 cylinder twin turbo setup from factory and those cars make upwards of 1000hp when built correctly
so does the transmission have extra stuff in it or it this computer control
Is there a seperate video showing the engine like @ 1:38
So...what time did it run? The opening video stops just before the end.
Theres some differences from a typical roots blower setup in this video. I wonder if they are correct...
The throttle is before the supercharger and a bypass valve is after the supercharger but opens into the supercharger inlet pipe to bypass boost.
Why there's no rev-limiter? Wouldn't it be much more efficient and repeatable if you could adjust the desired rpm for the track conditions and just sit in the lights with the throttle all the way down?
But still no engineer can bring the Rotary Engine back to life.
Burning engine oil by design does that to you.
What if is was an awd demon
JøÉ M it would just fly
Because it can get all of the weight onto the rear wheels, AWD would actually slow it down, as it would mean more power loss and less torque reaching the ground. If it could not lift the front axle, AWD would benefit it, or if it had significantly more power AWD could help further down the drag strip to gain speed.
Mopar, so many engineering firsts in the automotive world
Hey EE the throttle body on this engine is before the supercharger. Your diagram would be correct if this was a centrifugal supercharger.
dieseldan420ca he addressed this issue in a comment.
Does that mean the life of the clutch is reduced massively after a few launches if they're fighting against each other in 2 gears to hold it for launch?
Dan Rayment they arent slipping, so clutch wear should be minimal, or non existant. Holding a clutch without moving is like holding your brakes at a red light.
+Engineering Explained what is stall Speed ?
Any idea why Dodge went with the supercharger instead of turbocharger(s)? A two-step wouldn't pass emissions?
xWarPx turbo lag. You want boost off the line not halfway down the track
Ok so i understand what a transbrake does. But how does one install one? Is it just an electric circuit or mechanical? Can it be used on any transmission, i know it can only be used on automatic transmissions but how does it work on other transmission lets say a dog box or a Lenco transmission? Thanks in advance
Someone :D?
What does a decone engine block mean. Sorry for the bad spelling.
3:50
In the "unlikely scenario that the transmission were to fail..."
It's a Dodge. The more unlikely scenario is that the transmission consistently fails to fail.
Hello everyone and welcome
could you please give SI units like kW and Nm instead of obsolete units
engineering explained can u explain what is transbrake and linelock
Linelock is simply a valve to eliminate the rear brakes, thus allowing the driver to brake with only the front wheels.
Why did early engineers used 1st and reverse gear as trans brakes, if this system is more safe?
When you say 120% more torque do you mean it's over double or are you trying to say there is 1.2X torque (so only 20% more)
120% more, so over double, yes.
Holy cow that's ridiculous
Why not just give the car launch control too? The car already provides the driver aids mentioned in the video, so why make the driver hold a specific RPM range instead of giving them the "best" RPM with another aid in the form of launch control?
I don't think the stall of the torque converter is high enough to have a really good launch and for the trans brake to be effective. Should be upwards of 3500-4000 rpm although it would be harder on every component and would probably need a wheelie bar to control the launch.
Interesting
Always been a MOPAR fan . . . no matter what some people say. Though I love Porsche, I am hugely impressed at how Dodge finally, finally, FINALLY, built a musclecar (my favorite bodied musclecar) that smashes on a super quick 911 turbo S - especially while weighing 2 tons!!! So then, I have to ask, what the hell is Corvette's problem? Why is it that Corvette always gets smashed on by Porsche in the 1/4 mile? The Demon isn't a mid-engined car or anything and it's way heavier than a corvette, yet it can still beat a Porsche - can anyone explain?
can u do a "why drag cars use skinny front tires"...actually i know why they do but want to know the science behind it
Less drag, weight, and the only purpose of the front tires is to keep the car straight on a drag strip.
Like a stall kit. Makes an automatic behave more like a manual for launching. Still prefer manual. Do pretty much the same thing. Clutch in rev to about 2k rpm give or take, depends on your tires traction and how powerful the engine is. Experiment a lil. You want to push the envelope of your tires breaking traction. Tires just chirping a lol is perfect. So get the sweet spot rpm then pop clutch and push gas.
No
Request you to change the fluorescent color ..It's harsh on eyes and hard to read
Engaging first and reverse will brake the rear tyres ( Makes sense), but how 1st and 2nd will break it ??
Yathu prem Two different gear ratios. This causes the output gearing to be for two different shaft speeds and thus locks them up because it can't go two different rates of rotation at once.
He states the they lock "2nd" gear, but that's not exactly the case. These transmissions have 5 clutch pack(A, B, C, D, and E), and they are engaged and disengaged in certain combinations that make all 8 output gear ratios. The way they lock the transmission is by engaging all the necessary clutch packs for 1st gear, and engage one more that prevents output. I'm not sure off the top of my head which clutches are involved in all this on a Demon, but they combine in a way that locks the sun, planets, and ring gear of a planetary gear set, which prevents output from that gear set, and ultimately there is no output from the transmission.
+justin shamburger you're incorrect
John McKenzie explain
Still not actually seen the record breaking run. Anyone got a link?
Chevy could have easily come out with the same configuration. It's a nice trick. But doesn't GM a camaro that has a trans am conversion that put off 840 HP on pump gas.
Correct - but it has 1000 horsepower this year, on the Super Duty 455 version. The COPO camero will out-run a demon, but the demon remains street legal while that camaro is not. The T/A could give the demon a good run but probably needs the same or similar tires, and has a 500+ lb weight advantage.
Is dodge the only manufacturer using this technology....are there any other production cars that have this feature?
s2syed Most of this technology has been standard in the drag racing world for quite some time now. However, this is the very first mass-produced street legal car to use this technology.
Good day sir. I ask question, why the dodge companies doesn't use turbo charge? And why they choose super charge? Pls. Answer it and if you have time ask the dodge company till this my comment... ok?
Bec. I discovered that turbo better than to super charger in terms of boosting but why they go supercharger
Pls. Answer my question sir. Thanks
Turbos use exhaust gases to spool-up, and superchargers are belt driven, meaning, they're spooled-up at launch. If in doubt, ask what the experts use for launching at a drag strip - it's always superchargers. Turbos tend to be easier to incorporate and cheaper by manufacturers, which is why you will only see superchargers on the highest end vehicles by the big motor companies.
Torque Reserve seems like an incredibly misleading name to wow people who don't understand physics. This made me think of a giant torsion spring connected to the driveshaft, not fast-idle and constant intake boost. A reserve of torque is nonsensical. You can store energy (potential), but not torque. Only a tiny amount of energy (negligible) will be stored in the 8psi compressed air between the supercharger and the intake.
Considering the boost will be virtually instantaneously converted to a significant amount of torque at launch I would say it's far from misleading and instead just simplified for the sake of those who don't want to read a physics textbook when they're car shopping. "Object X stores Y and when the light turns green you get more torque" Torque Reserve
808 views on the vid after i watched it.....how ironic lol
Unlikely event the dodge transmission will fail?!! Cmon now... That's the first thing that will fail.
Wheels, Wings and Rotors Hahahahaha, yeah. That is their achilles heel. Like their 9 speed transmission fiasco in the Jeep Cherokee.
Wheels, Wings and Rotors nah that new 8 speed is bullet proof. Once dodge released their batch of 2016 cars, the reliability issues have gone way down.
If Audi could use a similar method in there non dual clutch RS cars, it would result in some crazy launches.
Do a video for how the hydraulics on the new ford GT work like how does the car goes down by 50mm in an instant
whats a ''stall speed''?
Basically it's the maximum RPM the torque converter can reach if the transmission output is locked (no driveshaft motion).
1St and 8th would be safer for the trans break because launching in 8 you will get less acceleration.
Oh this is just fancy words for 800 hp American v8 2 step
I find it funny that we are all so amazed at the Dodge demon for being so quick but no one seems to care about top fuel drag cars. They are crazy. 0 to 100 in one second. Let's talk about that!
You can drive it on the road.
I have! :) czcams.com/video/bI0YPTK32vc/video.html
se7en1976 Demon is faster than the P100D m8
those don't come from the factory ,
se7en1976 No it won't. It's not quicker or faster. Do the slightest bit of research.
You remind me of Brian cox
Actually, no, I am not familiar with how a trans brake works. I came here because the title said you'd explain how a trans brake works. Sheesh.
Am I early enough for notification squad? :D
Bugatti should sue you for having your logo look identical to their's
has dodge completely forgone the standard tranny?
i have no idea how this works
The supercharger is as big as my Tacoma's four-cylinder displacement Wise
The Demon with Meth would be 1000 hp!!
How old is this guy?
Carlos Alvarez either 25 or 54
Usually a trans brake Uses first and reverse 😂
How much stress is put on the transmission, which endures all that torque? Seems not so relyable on the long run...
xI2aiizza lmao
This is a drag car, what do you expect?
It bugs me more than it should that you didnt show either of the runs in thier entirety
The strip was not recording times.
Bugger
More s2000 vids haha
Why not put a camera at the front and autonomous technology so the car would drive itself. you just sit there and just watch as the car launches itself.