I ordered the shim stock, I think it said delivers Saturday
Then moved on the finishing up wiring the transductors,. I still need to rezip tie stuff but they work so I moved on to adjusting all the new knobs on the brakes. It was a little more finicky than I was expected but after about 30 minutes the measured curve seemed to match the spread sheet numbers pretty well. I created a new tab in the ECU display for chassis data figuring I'll add GPS and steering at some point.
Attachment:
Brake log.JPG [ 230.85 KiB | Viewed 2705 times ]
This is maybe only interesting to me but I replotted the calculations with G force on the bottom and realized that the mechanical bias takes me to 0.5 g which is really all normal driving and it doesn't take a lot of pedal pressure to get to line pressures that should be 0.5g with the new pads. The 1st proportioning valve is 0.5-1.0g which is the limit of most street tires 2which is clearly why factories set up the brakes with 1 valve. The 2nd valve works 1.0-1.25G which is DOT race tires and the 3rd valve is 1.25-1.5 which is slicks and that is pushing friking hard on the pedal. The proportioning valves are throwing pedal force away and by 1.5G I'm losing about 25% if I'm doing the math right. It also kind of shows why when you get good tires all of a sudden the rear starts locking and the brake pad people offer lower friction rear pads to help sort it.
Attachment:
brake pressure v G force.JPG [ 77.24 KiB | Viewed 2705 times ]