Mechanical Magic of LEGO Technic Lamborghini Sian FKP 37 42115 (8-Speed Gearbox)
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- Опубліковано 4 вер 2024
- Today I "unbrick" exactly how the 8-speed transmission works in the LEGO Technic Lamborghini Sian fkp 37 42115. This is an incredible model , and many people build this LEGO Technic Lamborghini Sian without ever understanding how the complex gearbox works. Personally, i never understood how the 8 speed gearbox worked until very recently. This iset is extremely and highly anticipated, and it keeps going out of stock due to its popular demand!
📸 Instagram: @unbrickme
#LEGOTechnic2020 #LEGOTechnicGearbox #LEGOTechnicLamborghini
If you have any questions regarding this gearbox or why yours doesn't work. Please DM me on instagram @unbrickme . There you can send me a couple pictures or a short video clip describing the problem. I'd love to help you out.
my gears only shift one time, what might be the problem?
When i am riding it on the floor i hear a tikking sounds what is that?
I have a problem if my gear but I fix it cuz I do something wrong cuz I guess I skip a page btw thanks
How do you connect the gearbox to the suspension in the instructions one page shows it upside down and the next page shows it right side up
First off GREAT VIDEO.... i have a problem with my car i made a short video on it thanks in advance
ua-cam.com/video/2D2C_1tzxvg/v-deo.html
I really appreciate the time you take to explain the mechanical engineering elements of these Lego technic components. It gives a whole new level of enjoyment and immersion into the hobby.
Never has a Lego technic video hurt my head as much as this did! 😂 👍👍
Sorry!
That was amazing thank you. The working gearbox blew my mind and now seeing it, it still blows my mind. Thank you for explaining it so well.
Glad it helped!
Great video, I really appreciate the clear explanation and close ups! This is my first big build and I had a small piece in the transmission wrong. I've got it working perfectly now AND I understand it thanks to you.
Brian Senez thank you very much I appreciate it
Wow!🤯 Your review finally explains why 3 last 7-speed supercars have 8-speed Lego-transmission🙆♂️
😮impressive. Thanks 🙌 Maybe more impressive it's to build, see and switch all this beauty personally)))
Thanks for the info about the transmission being in neutral; prevented me from tearing it back apart. I appreciate your video a lot.
Damn that's complex
Yeah it took me a while to understand the gearbox
Finally LEGO makes a AWD drivetrain for the Sian
they had such a drivetrain for many other vehicles
@@Unbrickme Thanks for the great video. If I switch to drive, is it AWD or rear wheel drive? If it is AWD and no center diff, will it causing problems when making a turn on high friction surface? Trying to replace the engine with motor, and this question came to my mind. Thanks
Oh my god. I have been waiting for this video for sooo long, thank you 🤩
No problem haha! I have a ot of unique LEGO Technic content so consider subscribing
I've just finished building this. It's an amazing set and i appreciate the engineering but how do you actually demonstrate it? It's not the kind of thing you can push around the floor.
In the first gear, you can feel more resistance when you push the car. When you go to the 8th gear there’s less resistance and the car can go a bit further with the same push with the first gear
Connect it to a motor
+the engine is completely covered up when finished.
@@Nr1from1978 you can see two of the twelve pistons
It's more of a display piece but you can push it around like i do..
Very cool video! I'm making the Sian at the moment. While building it I could kinda see what was going on in terms of the two sliding pieces that engage with the otherwise free red wheels... But trying to actually manipulate everything and see the ratios is pretty tricky. But once you get the front axle assembly on it all comes in to place and you can manipulate the sequential shifter: so yeah don't be discouraged if you're thinking "hmm I must've done something wrong" or it won't turn or anything... it all comes together :D
thanks for the encouraging comment!
That's so weird that it has essentially double the multiplier gears. Essentially the whole gearbox is more like a truck gearbox than a car one but very interesting to see how they did it.
and i love how you tried to explain
everysingle detail
Thank goodness for your detailed video. From this, I realized I had the stud on the green stepper mechanism reversed, such that the R side would not rotate through speeds 1-4, and would not engage the left side every 1 revolution. Pulled the chassis in half, flipped the stud on the green stepper around, and voila...works as you advertise!
A wonderful video really explaining both in an understandable way and in-depth how this gearbox works. Thank you so much! I will be saving this to my LEGO playlist to watch more in the future.
Thank you very much I’m flattered!
I just want to say that I am totally new to the world of gearboxes and this just blew my mind
i cannot tell you how badly i want to thank you
for fixing my sian problem i just want to say
thank you to you in person
Great explanation on the gear box! Love the math
Thank you so much! This video took me a while to make!
I have tried to find info about how the Bugatti gearbox works and its gear ratios ever since the Bugatti was released. Thank you for this and thank you for specifically addressing the differences between the two sets.
thanks for the explanation, i have both but don't understand the logic behind, and is good that you point out the differences between the two
I understood and i got it everything clear..!
After watchin this i feel so stupid taking apart my bugatti and essentially destroying it to figure out why the car wouldnt be pushed before i saw this video about sequential transmission and only then realized what the paddles were for 3 years after building
I'm about to start building this LEGO Technic 42115 Lamborghini set tonight. I don't want to watch this video until I finish so that I'm not spoiled by the experience! But, I was wondering if anyone has any tips, tricks, suggestions, words of caution for building this set or in general any Technic set of this scale? I've never built any Technic sets of this magnitude before. Thanks!
8:00 definitely fixable. Replace it with a solid 24T gear. I also fixed the issue where you had to push the chiron quite a distance for the engine to work, by replacing the 24/8 gear connection with a 1:1, greatly reducing timing.
Does the Sián work in the same way? Do you have to push the model quite far for the engine to work? If so apply that same fix I just mentioned on the chiron, behind the rear axle.
Great explanation!
Yeah I understand its fixable, but it would take too much time to dissasseble and reassemble, Yeah the Sian works the same way. Thanks for the tips! However, replacing the 24/8 with 1/1 will severely mess up the gear ratios, and the resulting speeds won't even be sequential
Unbrickme yes you are right, the marriage process is easily reversible but would still be a pain to get to lol. And It works fine for me with a 1:1 gearing. Again great video!
Question: I don't think the numbers and ratio calculations mattered to me as much as the actual mechanism. I think the way it was presented was a bit confusing with the arrows and all, and the concept at some point was just left behind in favor of talking about the numbers. My point is, I want to learn how to design a gearbox mechanism, rather than learn the Technic Sian model's gear ratios. Do you have a good source for technic gearbox function?
The problem I ran into occurs at 4:37. Until this point, it was clear where the power is going. But the arrows in this section are extremely confusing, because not all of the gears are properly visible, and your voice is just saying "here to here to here" without referencing anything visual. It's unclear whether the torque leaves the confines of the "box", the bluish gray frame, into the external gears, or if there is an additional gear inside the box that transfers the power.
Beyond this point, you stop talking about the mechanism of the actual gearbox, and only talk about the multiplier and the ratios. The complexity I was trying to understand is in the 4-transmission gearbox.
Now I get it!!! Thanx a bunch
no problem! consider checking out more technic content from me!
Great video
It was so easy to understand because you explained in detail 👍🏻
Thank you so much glad you liked it! Favorite technic set?
Wow you should also make your own buggy!
Perhaps
great video !
maybe someone has an answer for me:
i have a problem while switching from 4th to 5th gear (or frfom 8th back into the 1st) the mechanism as itself is working, but with the shifter behind the wheel i cant skip into the 5th gear. the black part that turns the yellow wheel always slips over it during the attempt. with my fingers i can turn the part, but i recognize a significant bigger effort. I thint thats the reason why it doesnt work with the pedal shifter. the question is: do you also feel a needed bigger effort? from where it results?
i found myself the answer :) for everybody who might have the same problem. in my case i used 2 yellow rubber bands instead of only 1, as in the book described. see also the video at 1:25
ua-cam.com/video/-e_vOJdyhG0/v-deo.html
it was a little bit difficulty to reach that point, but with a small needle i succesed to remove 1 one of the rubber. after that it works as it should ! now i can sleep well again... ;)
My gearbox has a problem. Shifting gears from 8th to 1st works fine, but the next set of shifting from 8th to 1st doesnt move the engine, it alternates between this. Does this happen because I built it wrong, or is it really supposed to do that? Thanks
Awesome video. High quality dude.
Thank you very much!
Wait what is lego postponing?
This guy teaches like a nice teachers and asks if we understand( thought i didn't really understand the most but still great video). Oh and btw this is probably yhe first vid if seen from this channel and im subbing.
I cant believe iy has been one year since the lego sian was first launched.
Just built mine yesterday, I love this set
Complex stuff. 👍
Glad you liked it
I remember building the Land Rover defender with its gearbox looking similar to the Lamborghini’s that kept on clicking. Does this set do the same?
Mines is coming tomorrow. I’m so excited, I feel like a kid on Christmas Eve!
That cuz you are lucky
I can finally sleep in peace knowing it's not only me that has a faulty Bugatti gear box hearing that made me tear up coz mine only works in reverse too. Just finished my sian and yea thank you for this video
Thanks for the detailed video! My gear box wasn't working properly and you helped me find my problem.
Great video! This is exactly what I was looking for!
I would be very thankful if you could explain how those lambo doors work because Im working on an aventador?
Yeah good idea I couple possibly make a video about that. Idk if it’ll be interesting tho
Wow thank you I don't know why there's no one else who does this kind of video. If you have the rough terrain crane could you please do a video like that about it, I would really appreciate because it's so interesting and I never managed to decode how 1 motor can do 7 functions without owning it
I don't think I can make a video explaining that set but I can give you the gist of it. Essentially there's 7 different axles all connected to each different function. The axles have driving rings which can connect to either the clockwise direction or counterclockwise direction. When you engage the driving ring into the different gears, each independent function activates with the gearbox and just one motor
I have a problem in mine between shifting gears, I think the gear box itself is working, the problem is in the paddle shifters keep slipping and they aren’t turning the cog that begins the shift between gears
Yeah the Bugatti and the Lamborghini paddle switchers are pretty bad. The Porsche’s paddles were fantastic
I played around with it for a couple of minutes, and it’s better now, but definitely still not ideal, still at least I know it’s not just mine. Thanks tons.
Unbrickme
I Also love the fact that you are searching through the comments and actually answering me/other people with problems
Woolly Rhinoceros thanks! I try to reply to everyone
Did you find any way to fix that? Im having the same issue and was thinking that maybe adding some more rubber bands may help it
Mine seems to be stuck in park. I've really only finished it a few days ago, so I'm sure I'll figure it out.
Anyone else have a shifting problem? It only makes half a shift then gets stuck, Ive checked that everything turns smooth and nothing is stuck but it keeps happening
Same
Nice explanation! Thank you!
I was going to buy a switch, but the Lego website convinced me otherwise, and now I have a Lambo on the way!
Awesome
I just finished building mine legit just now and i dont know why but but the 2 back wheels always either spin opposite to the front 2 wheels. For example, if i push both back wheels as if the car was gun drive forwards, the front 2 wheels would spin the other way to try to "reverse" the car
Like this v
⚙️v (back)
⚙️^ (front)
Thats what happens every time.
He needs more subscribers
Thank you very much I greatly appreciate it
I just finished my lambo, but i have an issue with the wheels, maybe some of u use to have the same problem, so if i spin 3 wheels to go to straight, (1 from the front and the ones in the back) they will spin well but the other one will go backwards, doesn’t matter what wheel it happens with all of them
Great video!!! It really helps me to understood. I have only a question: at the same wheel rotation speed in 8 the engine runs slower and in first faster right? So when you have an higher gear ratio the engine runs slower than an lower gear ratio. Sorry for my English I’m Italian
Yes that’s correct
@@Unbrickme ok thanks
Awesome
Thank you very much! Do you have this car or will you be getting it?
Idk but I really like it
For some reason I can only change the shift paddles into 2 positions, wonder where I went wrong
I have to say i prefer the chiron. This is still awesome tho
There was a typo in the instructions on the gearbox for the Bugatti. I forgot which step it was but you have to flip a gear around for it to work
Hello, very good video and very understandable! However, quick question. Can you keep upshifting that gearbox indefinitely (use same side of the lever to shift)? the gearbox will still go from 1st to 8th and then repeat, but there is nothing stopping you to use same lever to shift again at 8th? Thanks
Thank you very much! Yes you can infinitely shift up or down and it will just go in a loop
@@Unbrickme Thanks, thats what i came here to find out, I thought mine was wrong in that it kept cycling
Great video. I do have 2 questions about this gear box. (1) it seems moving the gear lever towards the front is actually the forward gear which is opposite of real cars. Is this expected on this set or I made a mistake in my build. (2) if I manually turn the black gear in the cockpit, I am basically only able to turn the wheels in 1st and 2nd gear. In higher gears there's great resistance that i feel like the axle is very stressed. Is this correct?
In car the gear numbering is reversed 1st being slowest and most torque to 8th most speed and least torque.
You are a genius
Man this video is great, subscribed instantly
Thank you so much :)
can you do one on the bugatti gearbox?
I love this! It all makes sense now! I have a question: is 1st gear supposed to be harder to turn? I had to build the gearbox a second time, because it was kinda rough turning it after I connected it to the rear differential, because it had A LOT of friction. Is that normal? I don’t remember 1st gear being that hard to turn on the Bugatti.
1st gear is always supposed to be harder to turn just like in real cars. If its excessive you should rebuild it
As a car guy, I get a little triggered when people pronounce car names wrong.
Did I pronounce it wrong?
Im just half way in the build, and i when i spin te back gear all the wheels are turning exept one of the front tires, i think something is build wrong in the differential, and i dont know how to access it😬
When do you think the ucs batmobile will retire? I will buy it in 2021 june...
I think you should be good then
Unbrickme OH MY GOD thank you so much Oh my god my brain was... Oh, my I was very worried about it Thanks
Unbrickme I have Another Question, will the creator expert's colorful box design will retire or all the modulars or cars that is creator expert will retire
Like can we get modular buildings like bookshop 1 year later?
I'm really worried about messing up the gearbox when I build mine.
Yeah same
I already messed mine
I am building mine now, and its not completed yet. It keeps jamming tho and seems to be very difficult to ratchet through the gears, then at times is seems its stuck between gears. Can you do an overview of how to properly "time" the linkages. i feel like this may be my problem.
I can only switch back and forth between two gears and I have no f****** idea where I got it wrong...
My differentials have a clicking noise when the two wheels rotate at different speeds…? Is that normal?
Can you please let me know how many miles per gallon does it get, and also what the best gear you would recommend for highway driving.
On my Lamborghini I've only completed like the shassy but without the other differentials bit when I spin the differentials the same way they go really tough and you can't move them is there a reason for this or is it something to do with the gears because I haven't don't the gears yet. Please see this.
There's probably a piece that fell in the gearbox that is jamming something
Hi there. Thanks for the amazing video and explanation. I am questioning if you can clarify if it is normal to have one of the wheels not spinning while the other 3 is going normal?
Is the under view mirrored? I think a better description would be that the bottom view is the bottom without the top. Otherwise the bottom view is the same as if you put a mirror under the bottom of the gearbox.
Yeah it’s mirrored, makes it easier to understand
I did not understand anything but I loved the video
:)
technic is TECHnical
Ha!
@unbrickme when i change the gear (4-5)and(1-8) it can't change.So what is the problem and how can i fix it ,cause it's my favorite set so i want to figure out 😢
I've just done step 250 where you put on the second axle assembly. I wanted to play with the engine and transmission a bit, so I put the four wheels on and tried rolling it on the ground, but now I have encountered a problem where sometimes the gear shifting doesn't change the rate of the fake V12 firing. Also, in some gears I can move the wheels one way but the other way is locked up and strips the gears if I try to move them. It also sometimes locks up in both directions. I have undone step 250 and taken the second axle back off to try and isolate the problem but it did not change anything.
I hope I explained my problem clearly enough. Any suggestions are appreciated!
Me pasa igual con lo del motor, cuando pongo en marcha el V12 no siento que los pistones vayan a diferentes velocidades según cambio la marcha, no sé que pasa pero todo el mecanismo está bien construido, es el único problema que tengo
I have a problem in my gearbox. When I am pushing the car forward, the rear tyres are going forward and front tyres are going forward. Is there are a way to fix it without breaking the car fully?
I’m not sure I understand what the problem is in your gearbox. You say when you roll the car forward both the front and back tires also go forward? So are you having issue putting the car in neutral?
Very good unbrickme greetings from Mexico 🇲🇽. How did you find yours cause I think there is a problem with stock of LEGO in the states
I already got mine is amazing
Wow awesome! I got mine because for a brief moment, my local lego store got a new batch of the Lamborghinis, and I got one. Did you also have the Bugatti and the Porsche before this?
I don’t have the Bugatti but I want to have it before it retires . Right now I have the Land Rover which I think is the best value and the 911 rsr. Probably the Bugatti will be next month.
@ unbrickme when do you think Bugatti retires??
@Preston Varner I believe that you should get the Bugatti, but please be very careful when assembling the gearbox of the bugatti. Also replace the clutch gear in the bugatti with a normal gear. The gearbox in the lamborghini has more refined pieces for some mechanisms and it gets stuck way less. Although if you prefer the bugatti aesthetically more, then get the bugatti
that is amazing
It might sound a bit critical but why do we to know all this tech info? All I know is it is not work forward or reverse. Why can't we know fix for this, things to check?
Hi I love your video! I have problem that when push the car tire is not moving at all even try to move back forward. How I can fix this issue? Can help me?
wait how come when the Lambo is in reverse the gearbox is still spinning
Because remember the drivetrain is always connected to the gearbox with an 8 tooth gear and a 24 tooth gear. When the car is in reverse, the drivetrain is directly connected to the engine, so it is completely unaffected by the gearbox. But, the drivetrain is always connected to the gearbox regardless. When the car is in drive position, the engine is connected to the gearbox, which is connected to the drivetrain with the 8 and 24 tooth gears
So if i shift it past the 8th gear it's just like i shifted it in first?
Very good video, and also comlex, do you know if the gearbox in your bugatti didnt work because you built it wrong or it didnt work because the modle wasnt design correctly? Btw do you recomend the buggati or the lamburghini and why?
I believe the gearbox in the bugatti didn't work because of the improper model design. There's a clutch gear, and there shouldn't be one. Clutch gears slip very easily, too easily. I reccomend the lamborghini because the gearbox is more refined, the model is newer, no clutch gears, and it looks cooler and has scissor doors.
I have the Bugatti and never really understood it, I k ow have the charger and want to build a gear box in it lol.
Im not an engineer but it feels overcomplicated, in order to get 8 speeds, all you need is 4 gears and 2 multipliers, So why it looks like it has 4 gears and 4 multipliers?
I just took apart my set cuz the shifting didn't work properly... I wasn't able to acces more than 3 speeds... Well turns out the problem was weak white rubber band under that black dashboard right above the paddle shifting mechanism... I ended up shortening the rubber band and it works again...
hi i just finished the motor bike today ducati kit. i went through the book step by step an it all works fine but there nice few bits left is this possible?? an i got two the same bits for a exauste for under the bike so i could only make one. i got the two same left bits only one right side bit would lego make a mistake like this?? im sure i went through the instruction book correctly i do not think it was possible i used the part some where else coz it would not have fitted else where. this was my first lego set so im not sure does this happen in sets
hello, usually you get a small handful of spare pieces in ever lego set. it's perfectly normal
Hello, we finish assembling the lambo but... the transmission is stuck. When the front wheel turn forward, the rear wheel want to turn reverse. Any idea what I have done wrong?
So fare I juste removed one of the drive shaft (front right wheel). Now the car is free and can movebut...:-( Frustrated. Can we flip a differential whitout disassembling everthing? Which one is the easier to get?
the thing is, English isn't my native language so I didn't learn how to use math in English... that why I don't understand sm about multiply square and divide, it's actually just hard for me to translate that to my native language
Hi when I put it in drive neutral or reverse my all four wheels seize up can u do a video about this it needs to be addressed and I paid £260 so please let's gather more people so lego can fix this problem
Any suggestions on Forward/Gear box not working? N and R work as inteded but when i use the paddleshift its just a binding feel. never fully clicks over on the yellow knobs.
Hello! Do you know why there are same pieces that have different shades of green? Nice explanation!!!
Manufacturing defect. Happened to most Lamborghinis from lego
I just finished this set and i found out my 4 wheels didnt drive, they go in opposite direction .. 😅😅
Try flipping one of the differentials
@@Unbrickme I have the same problem and wonder how to flip the diffs as when i check them their gears seem to be placed correctly (they are the opposite of each other)
@@erenozsu7657 im am too., im pretty sure that i followed the instruction step by step, every joint went snap perrfectly... cause im afraid i realize the mistake at the end,,but it still cant drive, i’ve just disasembled everything, waiting for a good day to build it all over again 😐
@@ducpham88 :( it seems like I have to dismantle the whole set too since the diffs are at the bottom I hope I could get them to work properly
@@erenozsu7657 yes, it’s from the first few steps :((
Net radio without a 12/20/28.
my gearbox gets stuck after a while in each direction? is this normal?
How do you tell the difference between the 1st gear and 8th? Without the power function?
At the stage just before the gearbox is brought up to the rear differential part. I try to turn the shafts but they dont want to rotate as if something is jamming. Is this normal or have I made a mistake?
Very technical review! Thanks for doing this! Have you tried to connect power function electric engine to a Lamborghini so you can drive it with a remote control?
Yes! And I’ve also tried to motorize the speed transmission gearbox! Unfortunately it is not ideal for motorization
@@Unbrickme wow cool, do you have a video?
I never posted a video on motorizing the Lamborghini because I was never able to successfully motorize the transmission and I don’t really have any spare control+ elements to use for the 90 degree rotation to switch the transmission. However, I do have videos on motorizing the concrete mixer truck 42112 and on motorizing the doms dodge charger