Touc4nx

[MOC] Subaru WRX STI W/ Instructions

Recommended Posts

After 9 month of work, I present the completed version of my latest Moc, a 2019 Subaru WRX STI

1920x1280.jpg

1920x1280.jpg

1920x1280.jpg

It features

  • AWD, with lockable central differential
  • 6+R Sequential gearbox
  • Fornt McPherson Suspension 
  • Rear double wishbone suspension, with anti-roll bar
  • Working fake boxer engine
  • Opening doors (front one with handle)
  • Opening hood (or bonnet)
  • Opening trunk
  • Interior with detailed dashboard
  • Decorated engine bay

Render of the gearbox :
STI_Gearbox.png

Full driveline

1920x1440.jpg

The belly shot

1280x720.jpg

The interior, with some detail, such as aerations.

1920x1280.jpg

Engine bay, made to look as close as possible to the real one :

1920x1280.jpg

81-All-New-2019-Subaru-Brz-Sti-Turbo-Con

 

 

It can also be built in white, with some minor adjustments.

1920x1280.jpg

1920x1280.jpg

1920x1280.jpg

I also created Instructions for it. The instructions are made for the black one, but can, with minor adjustment be used for the white one.
The instructions are 1218 pages long, handmade with Stud.io 2.0.
You can download a sample here.
Or look down here.

1280x720.jpg

You can Buy the instructions on Rebrickable.

https://rebrickable.com/mocs/MOC-38243/Toucanx/subaru-wrx-sti/#comments

And of course a video :

 

 

I Hope you like it.
If you have any question, don't hesitate, I will try to answer quickly.

 

After this line, starts the WIP thread.

–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––

Hi everyone,

It's been a long time since I haven't posted on this forum, but today I would like to share a new project that I have started not so long ago.
It's a Subaru Impreza WRX STI car that I will make.
2018_subaru_wrx_sti_03.jpg
 

The list of what I will put in the car is the following :

  • Awd
  • Boxer 4 engine
  • McPherson suspension for the front wheels
  • Indépendant double whisbone for the rear wheels
  • Lockable central differential
  • 5 speed sequential gearbox

I searched a bit for 5-speed sequential gearbox but I didn't found any. So I took a 4-speed gearbox design by @Rage_Hobbit (found there) and I added a 5th speed.
Here is the result :

1459193427m.png
 You can download the .lfx. Note that you are supposed to place rubber band linking the orange pieces to the black one under the blue triangle.
 I have already made the boxer engine and most of the chassis. It will use these wheels :
15038c04.png
It's the one that are used in 42077 rally car.

However I ran in a problem, it seems that the gearbox can not support the force involved in the transmission. The gears do a lot of skipping noises (doesn't sound healthy for the pieces). So I wanted to know if anyone knew a reliable 5-speed sequential gearbox / a 5+r sequential gearbox.
That's it for today. More updates coming soon.

Edited by Touc4nx
Finished MOC

Share this post


Link to post
Share on other sites
1 hour ago, Touc4nx said:

So I wanted to know if anyone knew a reliable 5-speed sequential gearbox / a 5+r sequential gearbox.

I know @Paul Boratko's 5+R AWD transmission. I modified it to include a center diff lock in this model. It surely doesn't slip, but it's not free of friction.

Share this post


Link to post
Share on other sites

Little update : I just looked online and found that the gearbox is supposed to be a 6 speed gearbox. So I will try to find a 6 speed design.
But thanks @Didumos69 for the idea of a 5+r gearbox but I think I won't use use it.
 

Share this post


Link to post
Share on other sites

Update : Some IRL pictures
Front suspension : McPherson with negative caster angle

Front%20suspension%20w:%20wheel.jpeg

Without wheels
Front%20suspention%20Without%20wheel.jpe

And a view from the bottom of the car :
Bottom%20view.jpeg

You can see the central differential in the middle of the picture.

Share this post


Link to post
Share on other sites
4 hours ago, Horace T said:

Are you using the larger springs at the front and rear ?

H

No I won't because I don't have 4 of them :wink:
But the travel of the suspension is the same.

Share this post


Link to post
Share on other sites

Here are some new pictures:

  • I added a working 6+R gearbox
  • I adde an anti-roll bar on the rear suspension

The gearbox ratios are :

rear : 1 ; 0,375

forward :

  • 1st : 1 ; 0,12
  • 2nd : 1 ; 0,2
  • 3rd : 1 ; 0,216
  • 4th : 1 ; 0,36
  • 5th : 1 ; 0,6
  • 6th : 1 ; 1

WRX%20STI%20in%20progress%204.png

The gear changing mechanism is behind the rear axle, and just need to be linked with a motor.
I use two 90° steppers (by @Didumos69) because they are compact and reliable. (it's this one, only the left part of it.)

11e1970b8c153ea30f2b38507568475c.jpg?155

The anti-roll bar is in pink in the render 

WRX%20STI%20in%20progress%203.png

And just for fun a render of the full car as it is built currently in digital version.
WRX%20STI%20in%20progress%201.png

 

Share this post


Link to post
Share on other sites

Quick video to show the gearbox in action.
(it's better to look at the front wheels to see the speed differences)

Share this post


Link to post
Share on other sites

I seriously doubt that the front suspension will hold the weight. Those yellow thin liftarms on the chassis will break.

Share this post


Link to post
Share on other sites

Hi,

Can you share the digital file of your 6 speed gearbox with the orange gear shifters.

I need a 7 speed gearbox for my MOC so could use this as a starting point.

Thanks

Share this post


Link to post
Share on other sites
On 4/18/2019 at 5:55 AM, Lipko said:

I seriously doubt that the front suspension will hold the weight. Those yellow thin liftarms on the chassis will break.

For now it holds it but I agree that later it might become a problem. So I will probably modify it for a stronger setup.
 

 

On 4/18/2019 at 6:37 AM, SNIPE said:

Hi,

Can you share the digital file of your 6 speed gearbox with the orange gear shifters.

I need a 7 speed gearbox for my MOC so could use this as a starting point.

Thanks

I put it on bricksafe : .lfx there is the gearbox file and the complete file. (blue 1L Liftarm stands for the blue clutch gear and the orange gear stands for the gear shifter.)
However it might be hard to turn it into a 7 speed gearbox, as it is more like a 3+R gearbox, linked with a 2 speed gearbox.

Share this post


Link to post
Share on other sites

Conisder using a direct shaft from XL motor to the fake engine, without passing the drive trough gearbox, pistons will move at the same speed on any gear.

Share this post


Link to post
Share on other sites

Going by the renders of the chassis I strongly advice you to use more lengthwise beams running through the chassis. Not only at the bottom but also higher up. And make a strong column running in-between the seats. If you don't do that, then I expect a lot of bending under the cars own weight with possibly squeezed frictioned gears as a result.

Share this post


Link to post
Share on other sites

Some updates.
I redesigned the gearbox, it's now way smaller, more compact and uses less gear.
Gear ratios are still the same.
6+R%20Sequential%20gearbox%20P1.png
The gearbox is now 12 x 13 x 5 (including all gears, but without the shifting mechanism.)

Input is in Green

Output is in Purple

Gear shifting is in Yellow

6+R%20Sequential%20gearbox%20P2.png

You can download the file here. (it's a Stud.io file)

Share this post


Link to post
Share on other sites

It's been a long time without any progress but today there is a lot.
I made the hood and the front

800x533.jpg 800x533.jpg

There is led light and you can open the hood ( I still have to make the engine better.)

800x533.jpg

I also reinforced the gearbox as some gear were skipping under high torque.
800x533.jpg

It's a bit messy with all the cables but now every motor is in place. It means that I can change speed, lock central differential, drive and steer the car.

That's it for today.

Edited by Touc4nx
Manipulation error

Share this post


Link to post
Share on other sites

This is a great work.

But you should definitively start by designing the bodywork and not the chassis. Juste make a fake chassis for the proportion (whee, wheelbase, width length etc.) and then make the bodywork. When the bodywork is perfect at your eyes, you can make the chassis, and fit all you want (and can) inside.

Because, as I see the project, I see the chassis is well done and very sophisticated, and the bodywork is not at this level of detail, a bit too bulky. So I advice to start with the bodywork to focus the effort on it and then made the chassis.

It is not a hard criticism, just a tips to have a bodywork which is a good, as the inside.

 

Share this post


Link to post
Share on other sites

I understand your point, however I don't see how I can apply your advice as I need a chassis with at least working suspension and steering to design the bodywork, especially the wheel arches...
And I almost always start a Moc with a list of functions I want in it. If I do the bodywork first, I'm scared not to be able to fit all mechanism.

( And bodywork is my weak point :cry_sad: )

Share this post


Link to post
Share on other sites

Nico - when you design your cars, do you start with body work and then work inwards to the chassis or do you start from the chassis out? 

Touc4nx - there is an old spoiler part that I think might look good for that hood scoop.  Keep up the great work.

Edited by KD123
Consolidation of posts.

Share this post


Link to post
Share on other sites

I realy like what you are doing here. The gearbox looks great! Like Nico said, the bodywork looks a bit bulky. The bonnet is a bit too flat and I think It should be inclined more when I look at the counterpart. Good luck!

Share this post


Link to post
Share on other sites
37 minutes ago, T Lego said:

The bonnet is a bit too flat and I think It should be inclined more

That's true, and by doing some comparison between the real car and mine, I realized that the hood is too high, it should be two stud lower.
So I'm searching for a way to do a smaller McPherson suspension. However I keep having a problem : the wheel and the wheel hub are pushed outside... :sceptic:
So if anyone has a design for small McPherson suspension, I would gladly take it.

Share this post


Link to post
Share on other sites

I personnally start to make a fake chassis with only the correct dimensions, wheel base and steering. And Then I design the bodywork. When I am satisfied with the bodywork (which can be before the end of design) I design the chassis. In this way, the bodywork is never bad compare to the functions :)

I start to make like that since the big Citroen 2CV because the bodywork was a huge challenge. And making a complete chassis and then can't figure out the bodywork would be losing my time.

Share this post


Link to post
Share on other sites

I'd use frame pieces instead of panels for structure, they offer way more fleyibility, and are way easier to use to achieve good stuctural integrity. I dont want to insult your work, but imo everything looks kind of fragile. The front bodywork looks pretty good though, the hood scoop is something I would try to improve tho. Put that hole in the hood, please :wink:.

Share this post


Link to post
Share on other sites
1 hour ago, nico71 said:

I personnally start to make a fake chassis with only the correct dimensions, wheel base and steering. And Then I design the bodywork. When I am satisfied with the bodywork (which can be before the end of design) I design the chassis. In this way, the bodywork is never bad compare to the functions :)

I start to make like that since the big Citroen 2CV because the bodywork was a huge challenge. And making a complete chassis and then can't figure out the bodywork would be losing my time.

Doing the Bodywork first is probably a good Idea for smaller Models like your amazing S2000 that have relatively simple internals. But for models with complicated functions like Gearboxes and stuff, you sometimes have to design the whole body around these functions. In my Honda NSX MOC (which I hope to upload here soon) I started with the 6 speed manual Transmission and built the whole car around it. There is no way I could have put in such a complicated mechanism in after doing the bodywork.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Recently Browsing   0 members

    No registered users viewing this page.