Cheers Carman, updated the script on my site.
OP, I've added some options for you to my
calculator. Fire it up, and select your the 'Wilwood (1.75") 310mm' front brakes, EK9 rear brakes and drum prop valve. Don't touch anything else, it's all set up for an EK. Whack up the power input to 380bhp and the speeds between 120 and 60mph. The power and speed inputs don't affect bias but good for checking the sort of temperature distribution you can expect.
With OEM pads front and rear, you'll see a
'Dynamic Bias' of
77%. ('Perfect bias' is 0%, where all four wheels lock at the same point.) If you've got more aggressive pads in the front than the rear, that might go up to 80%.
Now, 77% is
MASSIVE amounts of front bias, and it's no wonder they aren't performing right. In the darker green, you'll see
'Front Brake Force' of
94%. Your rear brakes are doing just 6% of the braking here. Further down, you'll see
'Dynamic Weight Distribution of
77%. Really, those two figures need to match, and when they do that is when the
'Dynamic Bias' will be 0%.
Obviously, you are a
long way off target. So let's have a look at what kind of changes will remedy that.
First things first, set the prop valve back to 'disc'.
'Front Brake Force' is now 89%, and the
'Dynamic Weight Distribution' is 78%. That will takes the
'Dynamic Bias' from 77% to 55%.
Next, try the smaller piston options on that size disc. The 1.38" pistons will take the
'Front Brake Force' down to 86%, and the
'Dynamic Weight Distribution' is now 79%. The
'Dynamic Bias' is now 40%.
This is about where stock systems sit. From here, you do the rest with the pad compounds. Selecting DS2500 from the drops downs for front and rear will set the
'Front Brake Force' down to 81%, and the
'Dynamic Weight Distribution' is now 80%. The
'Dynamic Bias' is now 7.8%, and that is about where you want to be for the best performance.
Obviously, take some time to play around with the other settings and make sure you've got all the other details matched up, for instance I don't know how heavy your car is, what the weight distribution is like (stripped out rear + turbo up front = more front %) or how sticky the tyres are. All these will have an effect, so set all those up and then re-do the procedure here, incrementally trying to get that dynamic bias down to around the 10% region.
Obviously the caliper fitment is a seperate issue which will need addressing.