How To Launch An Automatic Transmission Car - Torque Multiplication
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- Опубліковано 7 чер 2016
- How do you launch an automatic vehicle? How does torque multiplication work?
How To Launch A Manual - • How To Launch A Manual...
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How do I launch an automatic transmission? The process of launching a manual transmission is straight forward, but there are a few variables you need to adjust for optimizing your speed.
1. Press brake firmly with your left foot.
2. Apply throttle, holding the RPM at a desired speed.
3. Release the brake pedal.
4. Modulate the throttle as necessary to control wheel spin.
One of the impressive facts about automatic transmissions is that they are able to multiply torque through the torque converter, meaning you can use a lower RPM than a manual transmission vehicle and achieve the same initial acceleration. This is a result of a torque converter's stator, which redirects the transmission fluid flow leaving the turbine and entering the impeller, which sacrifices efficiency and speed for greater torque.
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As an engineer Ive received training in automatic transmission (with respect to industrial pumping systems) and nobody ever explained torque converter as well as you did. You made it sound really simple and clear in 4 minutes. Kudos.
Happy to hear it!
Before the internet became available, I read so many "explanations" that didn't include the one way clutch, but kept figuring it must be there for them to make sense (I never got around to asking a transmission shop). Finally, when it became possible, I did a search of "torque converter" and "one way clutch", which confirmed my suspicions.
I'm home alone stoned and a little bit drunk watching trough your newest videos, and I just wanna say how great your channel is. Always evolving, always updating, always coming up with something new to teach about cars. Keep it up! Much love from Norway.
+Eivind Tresselt thanks for watching, cheers!
I do it all the time!😂
I watch his videos stoned too.
Me too. Lol funny how the mind works
I feel like I need to be stoned just to understand what this guy is explaining
...
Slamming it into reverse cancels out any damage you caused by launching forward.
You mean R for Race!
haha.... haahahaha
😂
KelevraSXT you also need to remember if you're going to pass someone put it in "P" for pass
FOR ANYONE WHO IS NIAVE.. DONT DO THIS ..
FOR ANYONE WHO ISN'T .. LOL
Everything fun causes bad stuff to happen. :(
Shiit made my day
+se7en1976 😂😂😂😂😂😂😂😂😂
+se7en1976 , They aren't teenagers yet are they? LoL
***** , Hahaha!!!
and don't forget to turn your AC off for extra HP. :)
depends if it's a hybrid it doesn't affect it sometimes
Better put on some racing stripes for that matter :-)
I have a turbo whistle and it helps alot.
+K-Productions I sometimes ask passengers to get out for weight reduction.
most engine management systems disengages the AC compressor clutch during hard acceleration to reduce the load on the engine for maximum torque
I'm not someone you would consider a car guy, but I am in cyber security and my job (hobby as well here lets be honest) requires me to be extremely technical. Recently bought a 718 boxster and I'm really enjoying my journey into truly understanding what is going on inside of the machine I love so much. This is exactly the sort of education I needed. Engineers rock!
Doesn't matter how to launch, my Accent reaches Mach 3 at idle
I think you're confusing your car with your razor blade.
indeed
+Engineering Explained lol
+Engineering Explained topkek
Savage af!
brb going to grab my mom's soccer van. ...
Is it a Dodge Caravan
+xmxoo7 Na a chevy astro lol
this made my day. cheers mate.
BTW u totally can brake torque launch a 03 T&C
A video about CVT would be also really needed.
*Explains for 6 minutes how to launch your car, then tells you it will break the transmission if you do...*
Seriously though i love this channel :)
Not that you can't. It just quickly wears out the clutch pack and shortens the life of the transmission fluid. Some transmissions may also blow seals or have problems with valves from the pressure. It's really not that unlikely for some factory stock transmissions to piss out the red stuff if you're too hard on it. Yet if you're still inclined to have more fun and can afford it, there are aftermarket transmissions and stuff like higher stall converters purposely built to take the abuse. But then you're putting money in to have cars that can launch harder and switch gears faster than your average manual.
SSP performance ftw
And if you are Launching/Towing with an Auto often, make sure you have an adequate Trans cooler, to assist with the above.
Mingo Rolince Video is about, Toque converter.. the bit before the gears, so in comparison you are talking about a Clutch in a Manual, DCT uses Toque converters and is still an Auto.
Ehhh, you mean what is that smell.. You will only make the fluid hot in an Auto, hence the reason to not hold it there doing the two step, and worse case if you do boil the fluid all you do is change it and away you go, in a manual you need to change the Clutch disks as they glaze over, providing no bite or cause slippage.
+wobbly sauce the hard launch in manuals is simply more efficient. also hot boiling tranny oil makes it easier to damages your transmission as well. it won't lubricate as well so metal shavings will slide around the valve bodies and such.
I liked the way you explained how the torque converter works. I've watched numerous videos on how they work, and never really understood them. I find your videos informative and enjoy watching them.
Thanks Chris! Er.. muffins? :)
Best Car channel on the internet, thanks for the content and advice
*Makes a video on "things to never do in an automatic transmission car" explains how to best do one of those things a month later*
you mix the hard numbers and the real action... I love the auto launch disclamer, my car is still under warranty, so i will not try this at home, but i will buy a parachute, so i can be NHRA compliant ;) i love you.
just blew my engine up! wish I watched the last 10 seconds of the video. Oh well :(
The best explaination of how a torque converter really works I‘ve seen. I must admit that I searched for a long time for a video like this and the video title unfortunately doesn‘t really tell that it‘s being explained here. Maybe it should be changed to a more general title so it‘s easier to find for people who just want to know how a torque converter works. Greetings from Germany!
Best explanation of the topic ever, thankyou Gingerbeer Man.
You are A BRAVE, BRAVE SOUL! That is some really nice carpet to even be thinking about setting a torque converter on it! I know it's cleaned and all but still, BRAVE
This is one of the best explanations of anything of all time.
well done, thank you for this vid, that was something I had been thinking about recently, I've launched my vehicle a few times, everything runs perfectly fine after I was curious what actually happens. needless to say I won't be anymore, don't want to ruin it. thank you!
Been waiting for this video! Thanks!
really informative video, thanks Jason
Ever seen buick's old switch pitch transmission? Was used from 65-67 I believe, would change the stall on the converter depending on the load, was before it's time IMO.
Lol with the lambo's picture, i thought u were gonna do the launch demonstration on one. Keep up the good work and u'll get there eventually :)
Thanks! Great informative video!
the best engineering explanation ever✌ Keep going
Now I can drag race my mates.. Loved to see your guide on how to win a race 😉.
Great work, you're the best 👍
Nice!
Thank you, very well explained
Thanks for your great videos, had a question. I think I'm understanding your explanation of torque multiplication compared to manual transmissions. My question is that when we dyno'd cars at the shop I worked at, manuals always made more low end torque than autos with same mods, which is wouldn't what I would expect now that I understand torque multiplication. Could you explain why?
i did this on my e46 325i. put foot on brake, building up to 2k-2.5k rpm briefly, and let the inner beast growl under the hood. nice video.
That was a beautiful explanation
You're the man!
🍻😎👍 explained it extremely well! Good job!
Great video. I'm really interested in the application to a car with a turbo. I have a Forester and it's really very sluggish from standstill until the boost comes up. As its AWD and not crazy powerful, wheel spin is never an issue. The trouble is a short run up as you've demonstrated makes no real difference, it's not enough to spin up the turbo. I need to FLOOR it for at least about 3 seconds, then lift off the brake and it rockets away. I've only tried that a couple of times though due to concern about what it's doing to the transmission. It works, but well....
love your channel bro
Thanks for the explanation) Of course this affects the transmission, but we love fast starts with launch))
your videos are really interesting
If you have a low power car sometimes getting a little slip off the line can be good. Then when it does hook up you are higher in the rev range and have more power to put down instead of it just bogging.
Facts
A clear, outstanding presentation on Launching an AT (take off from a stop). This presentation was thorough and captivating. Great use of the whiteboard and outstanding illustration of the breakdown and function of the AT torque Converter. A+
So if you have a drivetrain that can easily break loose the drive wheels if you just floor it from a standstill (like any V6 front-driver I've driven), there'd be no advantage to the two-pedal launch, right? Or is there some other factor to consider? And would you consider a regular one-pedal hard start even nearly as abusive as a two-pedal one?
magnets: how do they work? an automatic transmission is powered by magic, and nothing can convince me otherwise,
Iv always said the same thing
Here's how magnets work: ua-cam.com/video/7nhmJPMi4FU/v-deo.html
So for an all wheel drive car where grip is not an issue, would the best launch RPM be where your engine is producing maximum torque?
My name is James May, can you teach us how to do a proper handbrake turn?
I approve! And your name is hilarious man XD
Thumbs up! xD
turn raise the ebrake then release it and counter stear
RWD with much torque: just hank on the throttle
FWD with much torque: throttle and Hbrake at the same time
Both: steer
Now I need a new transmission, thanks
Question:
The major factor which determines the optimal rpm to launch the vehicle is wheel slip. Are there any others which affect the optimal RPM?
these how to vids are really good for educational purposes. do you have any plans of adding more people to your team?
Very smart man. I like that. I like that.
Very informative thank you, love the cut-out to see inside! What causes a torque converter to slip, the internal clutch? The fluid still runs through even if dirty and burnt so I'd imagine that would affect the shifting more.
The pump (impeller) and turbine are not connected. The pump spins with the engine and the impeller drives the transmission. Think about a fan blowing air onto another fan - this will cause the other fan blade to spin, but obviously not at the same speed as the original fan. Similar concept to what's happening inside a torque converter.
Excellent explanation! In the case of a CVT transmission how it would be to launch? It's just for curiosisty. Greetings.
Can you make a video going over downshifting in a torque converter automatic? If I'm approaching a corner on the brakes, and I want to be in say 3rd gear so I can accelerate out quickly, how should I do that? In my G35 if I use the manumatic to put it into 4th, and then 3rd before I turn in, I can feel a lot of engine breaking going on with each downshift. Is this bad? If I very slightly give it some gas during each downshift, it is much smoother. Is this bad?
Where does neutral fit here? does it clutch out before or after the torque converter, or is it simply steadily applying heat to the transmission? wouldn't simply being stopped at a red light also build up quite a lot of heat in the torque converter (assuming you stay in drive)? I've only driven automatics a few times, and mostly with DSG (so no torque converter), so i'm not really familiar with how they react to different ways of dealing with standing in idle.
EDIT: one further question: how about launching with a DSG?
Would you consider doing a video on left foot braking a daily driver automatic car? Pros/cons/etc?
Great video!
I am curious how much this affects the life of an S4 2021 tiptronic transmission with 8k miles on it, if you were to do this type of launch 3-4 times, one after another.
One caveat, you only launched it the first time. The rest of the attempts you waited 5-10 seconds until the rpm’s went back down to idle from 3k, then let your foot off the brake because you were waiting for a “launch control” message to pop up, only to find out on a quick google search that tiptronic transmissions don’t have dual clutch and aren’t programmed to LC
well thank you so much" but its is a big diferce between (the parts of the transmission, converter and so) from a regular Ford F150 regular and a Ford F150 lightning?... thanx👍👍
think u probably should have started with the last part first then explain the process and what we doing to the car after. The last part sealed the deal for me. I can live without launching my car, it has a pretty good kick at stop and go. Pretty much so if im not careful ill be burning my tires too fast. Excellent work tho on all your videos.
Oh here is a question. Is it bad if im at a stop light and i suddenly floor the engine at green?
You can blow your engine due to the RPM just watch the gauge and let off the gas before it hits the redzone
thank you for the video. is this the same as the daul clutch transmission?
What's the maximum amount of time you can rev your engine up while ur holding the break? maybe like 5 secs or what? and what's the chance of something breaking if you keep it under that maximum time?
So Is this a better method than brake torquing or is it basically the same thing?
Can you do a video on neutral drops and why they are bad for an automatic transmission?
Head to 5:58 in this video: ua-cam.com/video/6zzEtxJkC7Y/v-deo.html
+Engineering Explained Thank you! That has helped me settle my debate with my friend. I appreciate the response.
Apliance Guru Eric seriously?
Do you have it in first gear if your automatic let’s you or put it in sport mode ?
there has to be a good way to do this in an automatic, low horsepower, front wheel drive car. this sadly, is probably what most of us drive. just look at how ubiquitous all those sedans are, chances are they're fwd automatic.
I drive a 2004 Chrysler Sebring😂
Thanks for the explanation. Would this launch technic be recommend on a FWD? And specially, a FWD with CVT?
Thanks
One question ive had is how an automatic transmission holds up on a race track. I recently bought a mustang Gt with an automatic and I want to attend a track day but it just seems like so much stress on the transmission. The braking, the hard acceleration. Will it be okay?
Would it be correct to say that the stator facilitates the return of the energy that was not absorbed by the turbine, to the impeller?
wow xjawz really turned his life around
ridiqul after going to rehab he discovered his passion for automotive engineering
you should do a video explaining engine valves and their purpose
thanks! it is good to know
Hello, Engineering Explained, if the vehicle you are launching has a sports/manual mode is it best to use it or it is best to leave it in fully automatic mode?
Cheers.
so why is the impeller (input) on the output side? wouldnt the housing that goes over the turbine just add unnecessary weight?
So what happens to the car when you press on he had peddle when in park? does it damage any parts of the car?
Can you do a video explaining how a PCV Valve functions?
Thanks!
+Engineering Explained Can you please do a video of if you can or can not "pop the clutch" on a push to start manual car? Twice I've tried doing so on my 2014 Civic Si when the battery is fully dead but could not getting to work. I know how to push start a manual key turn car. I also tried looking up the answer online, but just couldn't find a real true answer. Thanks buddy keep up the great videos. Tried writing this on your official website, but not sure if it posted since I didn't see it.
Hi, I’m the middle of a buy.. I bought a 2017 BMW 120i 2.0 twinpower turbo.. I really love how it works so I want to race with it but it doesn’t have launch control.. I have sport mode on engine and sport mode in transmission but w/o LC. I learned on your videos that it’s not good to launch a car.. there’s a person who sells like a system or module that modify the throttle response (doesn’t add HP’s or Torque) it goes behind the gas pedal and eliminates the delay of the throttle and gives you instant acceleration.. Is this like an aftermarket launch control or something? It is bad for my engine or transmission. What do you suggest? Thanks. Have a great day!
What shaft is the one-way clutch on the stator connected to?
Will holding the foot on the brake for too long, while the engine is working at high rpm damage the torque converter due to heat building up?
Yes. Not immediately, but over time, depending on your transmission cooling, overall temps, and age.
I got a Tucson 2016 limited and I got a heated transmission as I got stuck I. Traffic and I had to creep no other way of driving basically it was a stop and go situation I just bought it two weeks ago please help
Can you do a short video on how the one way clutch works in the stater?
Lol damn autocorrect, *stator
I have a honda CRV 2014 ... I know its not the CVT version... since it said 5 speeds when I bought it.... now of all the cars I have driven it feels a bit different. Not bad different - just different. Does it by any chance have a Hondamatic??? And how is a Hondamatic different from a regular Automatic?
Does that apply to rear wheel drive because you can do a burn out holding the brake and gas.
+Andy47357 yes, just don't apply too much throttle so the rear tires do not spin.
If I needed new brakes, would this method have a lesser effect due to me not being able to able as much throttle without the brakes not being able to hold it?
If your brakes can't hold your vehicle from moving forward, you definitely need new brakes.
Can you make a video on how launch control works on cars that have the launch control button like the nissan gtr
What sort of an advantage could I expect from using this technique as opposed to the simpleton way of just matting it after releasing the brake? I'm thinking a 1/2 second decrease in 0-60 at best (with my vehicle at least. I understand results may vary)
It is just getting to the Pre-load/Stall point faster.
0.5s sounds about right. Could be more depending on the power of your engine, the mass of it's parts before the torque converter, and how light the drive-line behind the torque converter is. Also depends on how much grip you've got available.
You really shouldn't be racing in an automatic anyways, though.
Racing generally is fine if you have the right Trans cooling, as it is all about heat management.
Install a bigger cooler, others install multiple.. some do both.
Or use a MANual! Sorry, I'll go away now...
PROcrastiDRIVE SV Fair enough. Certainly would if I could :p
2 questions: 1, do you need to turn off traction control to get a better launch? And 2, what car is that torque converter from?
does it also worth considering for good torque converter oil if i understand correctly? +Engineering Explained
This is the most extensive video I've ever seen on power breaking.
Another great video! What makes modern automatics both more fuel efficient and faster in terms of performance vs older autos and modern manuals?
For starters the number of gears in the transmission is almost always higher in an automatic. And fuel efficiency against older cars is achieved not only on the transmission, but on the engine, aerodynamics, suspension, etc.
You should also refer to the torque converter as a stall converter. Some have never heard of one or the other.
what overlay/program is used for the ATS-V 0-60 runs in video? I like it very clean and not complicated
It's their own "Performance Data Recorder" package. I believe Cosworth developed it for them, really nice option!
This is true if your engine control module doesn't cut torque or timing when you raise the RPMs before you launch.. I know many cars nowadays including mine will hesitate more off the line by building up RPMs rather than just flooring it. However if you have a laggy turbo car that allows for this then yes building up RPMs is the only way to get a great launch.
Hi! There seems to be some controversy if this is bad for your transmission. If it is how bad is it. I have a new Explorer ST. I would like to occasionally launch off the line. I do not want to do anything to hurt my new car. Will things break, wear out, etc. etc. if I do this. Thank you in advance!
I've did a launch before in my 99 ranger that's automatic
transmission is still fine
can you make a video about how to handle a skid ? tq
I tried this method on a 2015 honda accord coupe w/ a CVT transmission and the rev limiter kicks in at 2k rpms.
Do shifting a manual car with no clutch, please!
That's also a single frame saying "Don't".
Would this work with a CVT as well?
What he's talking about is a brake-stall launch, which is actually what you do if you lose traction with a 'flash' launch. Flash launch is just mashing down the gas pedal from idle about a half second before the green light. In that half second the RPM can build higher than it can with a stall launch, and when it gets there the engine is making more torque and the torque converter is also multiplying more. So if your traction is good enough or your motor too weak to break traction, then a flash launch will be faster.
And just because bad stuff can happen when you're trying to have fun doesn't mean they will, but if you never try to have fun you won't.
Should i turn off traction control when doing this?
from manual transmission you use the clutch to launch correct?
My car is an 04 Chrysler crossfire and it has 130k miles on it can I still do a launch or should I not even attempt to do one?