Wow, 84fwkw is impressive!
So I have a somewhat similar setup to yourself then I guess. HD bottom end, hi comp, ported HD head with cam. I reckon mine is a little over the 70fwkw then, because it definitely feels strong when it comes on, even when towing and A/C on.
The secret to the BC springs is that I spent time cross referencing engineering tables for dimensions and spring rates etc and found a common engine that fit these Daihatsu’s perfectly.
I made my own tool. It was basically a lever type piece of metal modified to bolt to the rocker assembly bolt and lever over the retainer with room to get to the collets. Rather simple really, think of the American NASCAR V8 building style, they have special tools that look like pry bars that do the springs due to the insane seated spring pressures.
Mate if it’s what you enjoy and are getting nice results keep the development up.
I thought I would also talk about my towing experience with the Charade. With the extra grunt to the front wheels at usable rev ranges, I have to say she is impressive. I can tow a decent weight over a variety of road types such as around town stop start, freeway, uphills etc with the A/C on too!. The sound she makes under load when you give it that tiny bit more throttle to accelerate is awesome.
And yes, she stops very well too, confident braking.
I drove from Sydney to Newcastle on evening to pick up a bike for a mate. It was a 2 hour drive each way on a freeway with some steep inclines and declines, so lots of heavy vehicle slow lanes on the left and heavy vehicle emergency stopping areas. She did it with ease.
On the way home however, I was on a main road off the freeway and coming down a steep hill to a signalised intersection and the light hits amber. I wasn’t far from the stop line and I was going to cruise through as it was the safer thing to do rather than slam the anchors. So I noticed one of the safety cameras that catch you on a red light and speeding, so I had no choice but to hit the brakes. So a very firm application of the brakes with a solid heel toe downshifting from 4th to 2nd pulled me up with metres to spare! Ha ha. Lucky there wasn’t anyone behind me.
In summary as best as I could describe that moment above, it stopped VERY WELL.
Stock Applause brakes front and rear.