jb70

v1.0 has been published on https://rebrickable.com/mocs/MOC-46782/jb70/42115-pimp-up-my-lamborghini/ Thanks a lot to all of you for your contributions so far!

I have now finished building instructions with v0.17: https://bricksafe.com/pages/jb70/42115-pimp-up-my-lamborghini And I tested all the new features in a real build. And I must say, I am very excited with the results! In my build the new gearbox and the V12 engine run smooth as butter. Even better and smarter to push the car in 1st gear compared to the Pimp up my Bugatti, although we have increased engine speed a little bit (14% more RPM as the Bugatti). @stevenhalim I am sorry, but also happy, that I could not confirm your test results with problems in 1st and 5th gear. If all the other gears run smooth in your build, there must be some problem in your build with the gears involved in 1st and 5th gear. You should check and maybe rebuild that section.

Today I have finished building instructions until end of Box 4 and released v0.16: https://bricksafe.com/pages/jb70/42115-pimp-up-my-lamborghini This MOD has been included. Thanks a lot to @stevenhalim for this clever solution. We always like to reduce friction in any gearboxes, but in case of the rear spoiler I would like to increase friction. The stock design was not able to keep the spoiler in the uplifted position. It always went down a little, when handling and using the car. So this is my simple MOD to increase friction a bit to keep it in place. It is still working fluent to operate the spoiler lift mechanism by the handle before the passenger seat. According to the total gearbox ratio discussed between @stevenhalim and @Didumos69 please be patient. I would like to verify the results in a real build by myself, but that may take another 1 or 2 days. I am busy on finishing the building instructions and verify them step by step with my real build.

Cool, I will change the black 6L axle to red, by that we also can leave out the red bush to avoid potential friction. And re-attach it to the front axle to cause some more friction? I think, we should leave the front axle as it is. Since the small visible grey part of the cardan shaft does not transmit any torque. This 9L-axle is a tricky part of the front axle. It was important for me, that you somehow can pull out the 9L axle before you disassemble the front axle from the chassis. If you don't, you need some brutal force and bend some beams to disassemble it. I will add a text in BI to "warn" the builder. I already suggested to add a 1L beam to the 2L axle sticking inside the top suspension arm. That would have a similar and "sustainable" effect. Can you test and compare it to the 4L lightsaber solution? Yes, I know about that. It was the same issue on the Porsche and Bugatti and every other Lego car, I know. I accepted that to be the Lego rule. To change it only in the Lamborghini would confuse me with my other cars. I am just building back the body and will compare it with my results in the next days. My test with the chassis only was fine also. From the theoretical point of view I do not see any negative issue by just adding weight to the car, unless the additional weight would really bend the structure too much to cause more friction.

I found an easy MOD to be able to remove the seats without bending too much beams and to to easy attach them again. Just remove the dark bluish grey 4L axle with stop and you can easily remove the seat, because the 2nd attachment is now also a 3L axle holding the lime 3L beam. To reattach the seat, plug it into the 3L axle and then plug in the 4L axle with stop to finally fix it. This MOD and some bug fixes are part of v0.15. Fixed! v0.15 is now available with building instructions until page 131. There are no changes afterwards so far, so you may continue with TLG original instructions from that point. https://bricksafe.com/pages/jb70/42115-pimp-up-my-lamborghini

Well observed! The black pin was left over from a previous design. I will delete it with the next release. Thanks for your review!

I would prefer @stevenhalim's first idea for the additional window in the middle. It fits perfectly into the clean design of the underside giving an additional view inside on the "red" cardan shaft between front and rear axle, the yellow knob gears for the shifting mechanism and the 2 CV-transmissions for forward and reverse gear between gearbox and DNR-switch. So thank you @stevenhalim for this idea and a warm welcome to be part of the Pimp Up My Lamborghini project, now. I have updated v0.14 with this MOD, made some better fixing of the two 8t-gear-axles before the DNR switch and completed the digital model. So far the PDF building instructions only contain the chassis with all the MODs until somewhere in the middle of Box 3. There are no changes afterwards, so you may continue build with the original TLG instructions from that point. https://bricksafe.com/pages/jb70/42115-pimp-up-my-lamborghini I am still waiting on the new parts to be published on ldraw.org to complete building instructions and finally publish this MOD on rebrickable.com.

Well spotted and thank you for your review and close look! 4 eyes do see more than 2 eyes. I found the part and will fixed it within the next release. The gear rack limiter is indeed that simple, works also in the stock build. Your solution would also work, but not such a clean build. So I invested the two additional pins.

I have pimped up the front axle and included this in v0.13 with MPD and PDF instructions: https://bricksafe.com/pages/jb70/42115-pimp-up-my-lamborghini The front axle has been optimized with Ackermann steering based on the design of Didumos69 with 6L steering links moving parallel to the 6L suspension arms reinforced front axle to better keep the huge powers of the pushrod suspension leaving out the broken (and therefore useless) white 4L bars giving even more clearance of the front axle added gear rack limiters to avoid grinding of the rims to the steering arms when steering is fully inclined. That leads to a slightly bigger turning radius of the car, but is still OK and somewhere in the middle between the Porsche and even better as the also 4WD driven Bugatti.

@DataNinja, so far I only have 80% of the build (Box 1-4) in my digital model. So would be difficult to compare. It's better to wait a few days until I finished the digital build. Then I will publish the MOD with part list on rebrickable. @Didumos69, due to my tests in real life It should be in the correct (lower) position for 1st gear in version 0.12. It is already in stock position now, the same as in your pics above. I had it in the upper position in an earlier version (v0.9) in the last days, and corrected it with v0.10.

I think I am finished now with pimping up the gearbox and drive train. I have build and tested it on a real model. Now everything is buildable. The pimped up Lamborghini looks and works very smooth. MPD and PDF building instructions v0.12 are ready for download. Maybe we have the most compact sequential 8+R gearbox with central differential for 4WD and 8-1-gear-block ever designed with LEGO technic. Many thanks to @Didumos69! It works very efficient and looks beautiful in the car: @astyanax Thank you for your review. I have corrected this. Next I will focus on pimping up the front axle. Didumos Ackermann geometry is a good starting point for that: I noticed that the original steering has a little Toe-Out-effect: The wheels are pointing slightly outwards, because the 9L steering links are not parallel to the 6L suspension arms. Another issue are the white 4L bars sticking inside the suspension arms: I think they should limit the suspension from fully extracting. Maybe to lower the front axle compared a bit compared to the rear axle to give the car a more sporty look. But they both suffered their job after only 2,5 weeks mostly standing still without heavy motion. They bended clearly visible under the load of the suspension and are already cracked a little bit. I think, we can leave them out. They don't work anyway. If the front needs to be lowered, we could add a 1L beam to the 3L axle inside the suspension arms.

In the last days I have build the Pimp up my Lamborghini Project in a real model. To be able to build it efficiently I created building instructions for myself and optimized them while building it so far. I changed many small things on the way to go to make it work and satisfy myself (change sequence in the building instructions, modify some colors to get a clean build, optimizing some parts, etc.). Main technical change was in the Hand-Of-God shifting. I added two gear meshes to gear it down. Now the gear indicator only turns about 225 degrees between 1st and 8th gear. In my first solution with the knob gears it turned twice from 1st to 8th gear. On page 95 the chassis with all the technical features for drive, gearbox and steering have been finished making it ready for a TEST DRIVE. I am very satisfied with my TEST DRIVE. All modified features (Gearbox, HOG steering and shifting) work very smart and smooth. If you like, take a look at the digital model (MPD) and building instructions (PDF) so far. The project is still WORK-IN-PROGRESS, but I will upload regular updates on this page: https://bricksafe.com/pages/jb70/42115-pimp-up-my-lamborghini @Didumos69 You really managed it to get all the gears inside the frame? - That's very cool!!! I will have a look on this, test it in my real build and will give feedback to you!

Great work, @Didumos69! That is a very ingenious idea with the inverter. The most compact solution to change direction of the reverse gear. And swapping the DNR gives us more space to connect the reverse gear on the passenger side without colliding with the paddle shifter. Very clever!

The "Pimp up my Lamborghini" project is making progress. Today I reached my second goal: Adding HOG steering! And I also added HOG shifting! Which also works as a gear indicator on the dashboard. By the way I also reversed the paddle shifter, so now you will shift up, when you pull the right paddle towards the driver and shift down, when you pull the left paddle. And another small improvement: Secure the two 2L-liftarms on top of the paddle shifters with two 3L-axles with end stop. I found a loose 2L-liftarm in my Lamborghini at first not knowing where it fell off. After a few days I recognized, they easy fell off from the paddle shifter, if you "pull" them . The gearbox has also been further improved thanks to the very valuable input from @Didumos69. The gear sequences kept the same, but we shifted some axles and gears to make it beautiful symmetrical: And I included the "Removable cylinder head cover" from @DataNinja: So far my digital build only contains Box 1-3. Box 4-6 are still missing and will take some days to complete. And it has not been tested so far in a real build. But, if you are interested in my daily work-in-progress, you will find some regular updates under this link: https://bricksafe.com/files/jb70/42115-pimp-up-my-lamborghini/42115 Pimp up my Lamborghini.mpd

@DataNinja Cool! Simple MOD, but effective!

@Didumos69 Do you mean something like this (colored in orange)? That's a great idea! Of course also the reverse gear should be connected directly to the center diff. There should be enough space in the Lamborghini to get it fit in, so it might work. I need to check tomorrow! But, I think, we need to add at least on more gear pair in the orange gear track to change direction and make it get really a "reverse" gear, do you agree?

This is a comparison of the original gearbox (which is exactly the same gear sequence as in the 42083 Bugatti Chiron): And my new optimized gearbox:

My first goal has been reached. At least in a virtual build. I need to build and test it in the real model. It was quite a challenge to get the optimized gearbox mechanics from Pimp up my Bugatti to fit into this nice new 15x11 frame without interfering with the surrounding parts of the Lamborghini Sian. But in the end it worked and I am very happy with it!

Today I finally finished my out-of-the-box-build of the 42115 Lamborghini Sian. And these are my first impressions: The design of the car is very beautiful and detailed. Some nice new parts. The build took me 7 days in the evening hours and was a lot of fun to build. The video podcasts tell you nice facts from both the Lego designers and the Lamborghini designers. Scissor doors are working perfectly Moving Spoiler up and down is also working perfectly No HOG Steering. No center differential. Gearbox has no limiter, means that shifting up from 8th gear will continue with 1st gear. When steering wheel is turned to the limits, something seems to rub at the rims. Paddle shifter has been improved from Bugatti, but still works in the wrong direction (pulling right paddle to the driver should shift up (+), but it shifts down). I will now start working on a "Pimp up my Lamborghini" project to add and share some useful MODs to this beautiful model. At first I would like to focus on: Adding HOG steering, and solve the rub on the rim issue Adding center diff and gearbox limiter (try to place the mechanics from the gearbox of Pimped Up My Bugatti into the nice new frame window of the Lamborghini Sian) Any hints and solution ideas from this community are very welcome!

I am very happy with the removable body. It is very sturdy: sturdy and flexible, when removed, sturdy and stiff, when mounted to the chassis.

Based on your solutions in this forum I compiled a new release v1.3 of Pimp up my Land Rover with free PDF building instructions. The honors go to @Leewan Thanks a lot for your improvement. It reduces friction by slowing down the gearbox and reduces the "hard-to-push" effect, when you select reverse gear while the gearbox is in high gears. Many thanks go also to @Pattspatt Pattspatt found some very clever solutions for this Body-Removal. I took his solution as a base and added some additional changes in chassis and body for more rigidity of the body and to make the mount / remove process of the body more easier to use. I think, this is a great improvement for this MOD! Finally many thanks to @Urbal! He asked me, if I had some plans to add Ackermann steering to the Land Rover. I already thought about it, but I didn't succeed so far. But Urbal's question challenged me and finally I found a solution: So thanks a lot for contributing and have fun to pimp up your Land Rover!

I have redesigned the front axle and integrated Ackermann steering. To do this I needed to reverse the steering rack from rear to front. As result I could even remove some gears and simplified the steering. It works pretty fine: I plan to add this feature to Pimp up my Land Rover in the next weeks.

@SNIPE, that's what I said. But I try to combine "only" the best MODs that are available and give additional benefit and usability in the Pimp up my Bugatti project. I welcome any ideas this forum brings up, but It's not possible to combine every ideas in ONE MOD. For example I think, adding motorization would be a totally different approach to all the MODs that are included by now. So far I do not know any concrete solutions for major improvements to release v1.6. But I stay tuned...

@LupoNegro Please have a look on the history pages. There you will find a part list for v1.3 and a comparison of part lists: https://bricksafe.com/pages/jb70/42083-pimp-up-my-bugatti/history/v1.3

Good idea! I will take this on my list for 1.6 (so far this is the only change planned, so I will wait until some other major changes...). I think we can completely remove this blue 20t clutch gear in the rear diff. There is no one in the front diff, so it should work fine without. So maybe TLG just wanted to give us a free clutch gear in the Chiron, now we need two of them . But they are affordable now, because they reappear in some newer sets since 2019.