Marino’s rwd Platz

[Marino Fischer]

Introduction.

Hello, this is what I hope to be a build thread for me converting my Toyota Platz to rwd. 
A Platz for most people seems an odd vehicle to put money in to and spend this much effort on, but I come from a background of vitzs so naturally I had to do something to the sedan version. I want to create something unique and different and show potential of these strange commuter cars. Here is a photo of the base car.

I have to mention this project is based around chopping the car as minimal as possible so it still has the ability to revert back to fwd for legality reasons. This adds the the complexity of not being able to just hack it up and use a Silvia subframe so it will end up being more of a bolt in a fair. Another factor is that it will be slammed on 13s and when doing that the centre point of the hub is almost inline with the chassis rails so this means it isn’t possible to use a solid rear axles either. 

I look forward to sharing my progress on here.
 

 

[Dudley]

Who the fuck let this punk in here?

[kpr]

Ban

[Marino Fischer]

Originally I wanted to make a tubular subframe that bolts in using McPherson suspension and front hubs in the rear but after making a few mock-ups I found this idea would prove to be difficult as I was still having clearance issues working around a fwd chassis. I would also not be able to run a cable hand break so I gave up with this idea.

I then started to research bolting 4wd Corolla hubs on to the rear beam and working around the standard Platz suspension. I found that there were no bolt in hubs so I’d have to modify the mounting anyway. I then though you know what stuff it why don’t I use Nissan 4 stud hubs. They are proven to stand up to the task, can fit 13s and are already 4x114.3. One of my friends kindly donated me some rear hubs and axels and I got to work designing mounting points for them. I designed some some plates in Onshape for plasma cutting which was quite a learning curve for me.

 

[Dudley]

Do better adrianmontgomory

[Roman]

Finally, someone good from Northland on the forum 

[Dudley]

Yeah fuck that kpr guy……….

[Marino Fischer]

I used a jig to align the the hub mounts and then weld them on. I went for 8mm think plate combined with another 6mm plate instead of the smaller original size of 5mm. I will have to notch the center of the beam for the rear diff to pass under it. I will be using a r180 diff from a c33 laurel which still seems overkill for such a small car and I’m also convinced this rear end already weights more than the whole engine. I have started making a diff cradle which bolts on to the two rear tow eyes are and it also shares the same mounts as the rear beam. The diff cradle doesn’t represent the final product, Ideally I’d like to bend the tube nicely but for now all I really want to do is prove the theory. I have attached a photo of where I currently am with the rear end design. 

[Marino Fischer]

I wanted to keep the factory (1nzfe) motor in the car for simplicity, the fact that I just like them and yes fuel economy.. so I set about adapting a t40 transmission to fit.

I went with the t40 transmission as mainly a mock up for a future t50. I wanted to use it as supposed to a j160 as it’s on the smaller side so I have to do minimal modification to my transmission tunnel and it will be more than capable for what I’m wanting to do with it. 

I started off using a t2 bel housing which was a lot cheaper than cutting up a 4age housing. The t2 one was a lot longer than what the 1nz clutch assembly was used to so the input shaft didnt reach therefore a simple adapter plate wouldn’t work. I then decided to use the fwd bell housing and adapt off that. I had to keep the end off the t2 bell housing still as it has bearing supports at the end of it. The clutch assembly is all still the same as the standard fwd setup and the input shaft from the t40 has the same spline count so it all worked quite well. I will attach a photo below of how I adapted it.

thank you Dudley in this group for supplying me with the transmission.

[igor]

Keen to see how this thing works out. Can't help wondering if they available 4wd in Japan like so many other things? Guess you already thought of that though.

[tortron]

14 minutes ago, igor said:

Keen to see how this thing works out. Can't help wondering if they available 4wd in Japan like so many other things? Guess you already thought of that though.

they are available 4wd, but its those tiny little rear diffs just for helping out in the snow

[GARDRB]

12 minutes ago, tortron said:

they are available 4wd, but its those tiny little rear diffs just for helping out in the snow

The tiny rear diff is the same as an ae86 diff according to Amayama if I recall correctly, the transfer case on the other hand... that's basically made of chocolate

[tortron]

20 minutes ago, GARDRB said:

ae86 diff

never handle the 1nz m9

[Marino Fischer]

Igor, yes they are available here in 4wd but very hard to find. If I do find one I’ll end up buying it. 

[ThePog]

Tbh I am slightly disappointed it isnt getting a mid/rear engined 1nz with the existing box.

Easy to twin engine it then

[Marino Fischer]

40 minutes ago, ThePog said:

Tbh I am slightly disappointed it isnt getting a mid/rear engined 1nz with the existing box.

Easy to twin engine it then

Yea na im gearing it towards more of a drift car and putting an engine in the rear would mean lots of chopping which goes against  my whole idea of being able to swap it back to fwd for a wof.

[Roman]

Just making something east west mid engined is a bit of a lame way to make it RWD I reckon. 

Not enough suffering involved 

[Dudley]

He owns a platz, I think that’s sufficient enough for suffering 

[ajg193]

Cool project but, man, what a strange set of constraints you are setting yourself. 

Why not just get it certed for RWD and save yourself major ballache?

[Marino Fischer]

9 minutes ago, ajg193 said:

Cool project but, man, what a strange set of constraints you are setting yourself. 

Why not just get it certed for RWD and save yourself major ballache?

I can’t be assed going through cert with it and it adds a bit of challenge which I quite like.