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Old 04-15-2010, 11:36 PM   #61
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Had he been running a factory system as I first thought. I would have stuck to my, you need more practice statement. My mistake, I corrected it though. Of course I realize that you don't make mistakes. Did you even bother to notice that I stated, I didn't realize the brake upgrade. Or are you so **** fire in hurry to throw down and start a fight that you don't care that I admitted my mistake and given the new information changed my point of view?
I would be if the information made any difference. Stock Miata bias sucks ***. The only people who have EVER tried to argue this is close-minded SM drivers, mostly the same crowd that thinks that wings make us slower, 225s and 9" wheels are too wide, and nobody needs more than 200whp in a Miata. Since the rotor size change on his car with sport brakes is minimal, and the 4-pot Wilwood caliper he's using has 3% more piston surface area than the stock caliper does, it's safe to say that the Wilwoods have basically nothing to do with the shitty bias on these cars. What they do do is make the brake pedal so much firmer and easier to modulate that the shitty bias comes to light with ease. I don't sell those brakes to give the car more front braking ability - in fact I use a 6-pot Dynapro on my own car with LESS piston surface area than the DL4 caliper Jason has. I sell it for pad life and feel.

The only other way to correct the bias is to use different pads, but you said yourself why that isn't ideal - using a stronger pad out back to adjust for the feel means the pads will change friction coefficients differently during a long session or race, and what may be awesome cold bite will turn into a car that is constantly trying to kill you after 10 or 12 laps.

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Given the fact that the OP is new to road course driving. I intentionally left out trail braking and car rotation. It is not exactly road course 101 in my opinion. I hope that you will agree that the art of trail braking for car rotation is a more advanced concept that a green track guy should not be trying.
I'll agree with that. This forum is pretty rough and tumble, but you seem to have a thick skin. Hang onto it and you'll enjoy your time here.
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Old 04-16-2010, 12:34 AM   #62
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I can see your point with SM guys. Of course I am not a run of the mill SM driver.. If I was I wouldn't be looking to boost my conversion.

You are right, factory Miata bias is not great. It took me a while to get the feel for braking at the limit. I did flat spot more than 1 set of tires early on when learning how to drive the stock brakes at the limit. I guess it is a lesson that you tend to forget after 7 years of driving SM. But you have no choice in SM so you learn to drive what is available.

I am looking at brakes for my car but they are just a wish list item at this point. Are you running twin master cylinders with a bias bar, or are there adjustable bias valves available that you can incorporate into the stock brake lines?
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Old 04-16-2010, 08:44 PM   #63
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I am looking at brakes for my car but they are just a wish list item at this point. Are you running twin master cylinders with a bias bar, or are there adjustable bias valves available that you can incorporate into the stock brake lines?
I wish I had the coin for a Tilton box with a bias bar. I'm using an in-line adjustable bias valve connected to the rear brakes - more restriction = more pressure = more force. It's a bit more complicated than it sounds, just on the way the valve actually works and what the adjustment actually does, but that's the basic idea. You delete the stock bias valve, run the front brakes wide open, and install an adjustable valve in the line for the rear brakes.
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