Good to see the progress, the pics look amazing side note; I want your wheelsSo a few things I've noticed after going to race a few times now. the rear drums seem to definately not be up to the task of track use and started getting hot after 40 second sessions. I'll try a old hot rod trick by drilling them out, (similar to a cross drilled rotor) to keep them cooler, but i have to stress that this should not be used for a street car and you should swap drums to a non drilled out set. this should help reduce some heat and let the rear drums work a bit better. if i can get a set for this before the next event, ill post my findings since there may be a few people who may be interested in tracking their car still. i do think this mod will be better suited towards a higher speed track day.
As for the rear brakes in my research the only thing I could find was that the GTX baleno rear discs fit, apart from that my research has come up with dead ends. Aerio/Liana only ever came out with drums here so that was a no go. Looked at the Swift GTI (old one with the G13B) and it looks like it needs heavy modification to even work.
The only way I could see of properly upgrading the brakes (Both front and rear) was to find a disc that would work (4x100 with a certain ID and height) and a caliper that went with that disc and look at having a custom bracket made up to mate the two.
In practice I can try and 3d print designs and see what ends up working, then taking that to a shop so they can custom mill the brackets for me but in this current "Rona" world the cheapest quote I got was $800-1000 depending on the complexity of the bracket required. This was just for milling, I was going to do the R&D. It turns out one offs are very expensive. Something like this:
This would open up many different options I would start with suzuki models and try and adapt a swift (New gen) brake setup to the Baleno. The disc might be too tall but it would be a start. And parts for them are super common so sourcing them wont be too much of a hassle.
The size difference would be as follows:
Front: 235mm Diameter
Rear: Peasant drum brakes
Swift (FZ/NZ roughly 2010/12 onwards)
Front: 256mm Diameter
Rear: 259mm Diameter
Aftermarket Options: Alot
I think the only way I will be able to properly see what would be the best fit is to have a bunch of parts cars sitting there and chop and change one can only dream.