hey dave, i dunno if i ever told you, but I thought your brakeman setup kinda sucked. and i didn't drive your car that hard. heheh.

u need to get a job! j/k. looks like you're taking it seriously. i'll eagerly await your result. :-)

 

This is good stuff. Any idea if this will work with stock wheels? I'm guessing no.

 

I have drawings etc for a bracket that will accomodate a 12.2" diameter rotor. That would have the greatest chance of fitting. At this point tho i have no measurments to even hazard a guess if it will fit in the stock wheels. Hmmm... give me a few hours and i'll create a mockup of the bracket and check it out.

 

Rev,

Here are a couple pictures of a mockup bracket for a 12.2" rotor.
The first picture shows the caliper and mockup mounted to the spindle.
The second picture shows this setup with the stock wheel mounted. I needed about 3/8" of wheel spacing in order to get this to work. Notice how little wheel stud comes thru the wheel. This wheel spacing gave about 1/8" of clearance between the wheel and caliper. I could probably reduce the space by 1/16" if need be. Either way you would need longer studs for this to work.

I'm going to leave this info here for now and if in the future I seriously pursue this I'll integrate it into the info above.

 

Dave correct me if I'm wrong but if you plan to go to a 2 master system won't you need to toss out your hydraulic ratio? I'm assuming that 2 masters will have a total hydraulic capacity greater than the 1 we have now?

 

Ahh The stock master cylinder is actually 2 master cylinders. It is whats called a tandem master cylinder. Much like this one but with equal circuit bias... http://www.wilwood.com/products/master_cyl...andem/index.asp

They do this so that we have two independant diagonal hydraulic circuits.

 

Could you "rewire" the stock one to do the same thing? It there a bias adjustment between the two? If you replace the stock MC will you get a replacement that retains the same specs with regard to hydraulic capacity?

 

However, You question does raise a concern that just occured to me. And that is, is each circuit in our stock MC a 1" circuit or is this 1" split evenly between the 2 circuits. I had assumed in all the above calcs that it was the first case and not the second. I hope that was a correct assumption on my part.

 

Dave - a couple of notes...both primary and secondary pistons in the M/C are 1" dia. I am confident the stroke is the same between the two, also (though we do make some with different length strokes). Secondly, though it's plumbed diagonally split, the ABS does not differentiate between circuits. If you have impending lock-up on the right front, the solenoid cycles the pressure to the right front, not to the rf/lr circuit. So going to a front/rear split won't gain you anything.

In development, I could certainly outbrake the ABS system. However, we have to make a compromise between stability and performance. Completely bypassing the ABS unit and improving your braking abilities is the "racer" way to go, and dual masters does give you much better tuneability.

 

SR71BB,

Thank you for the info! I was certain that the diameter of each of the bores in the stock MC were the same size as each has to drive identical diagonal circuits. I was just concerned that they weren't 1" diameter.

I became concerned after I realized that the wilwood tandem MC above probably achieved the 69/31% split through the use of different bore sizes front to rear. If that is indeed the case then how does the 1.125" spec of the Wilwood MC properly describe the bore size?