anyone going to try 949's brake upgrade?
#41
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I was checking parts the other night and my 90 calipers are much different than the 97's on the car. the piston is smaller and the "fingers" are shorter. I'll snap a pic tonight to compare the two.
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no, that's its "lowest" setting. With it set at it's lowest setting you can reduce the rear pressure 57%. I'm not reducing it that much....I have plenty more room to increase the rears if need be. I'll probably have to crank it up when I put my xp10/xp8s on.
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NA6 and NA8 calipers are indeed different. NA8 brackets on NA6 calipers work, but are not the most ideal set up. Uneven pad wear is a symptom of single piston calipers.
Front brakes are always 100%. Rear brakes are always less*
*under light braking, the prop valve does not reduce pressure to the rears.
#45
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So in Wilwood's site it says its maximum setting (all the way screwed out I believe) is 57%. That means that when all the way screwed out, my rear brakes are at 57% of my front's, which is 3% less than my stock '93 proportioning valve, is this all correct? I have mine cranked all the way down (which means they're getting the same pressure as the fronts, right?) and I still can't get the rears to lock up first, its very frustrating.
Ben, you say uneven pad wear is a symptom of single piston calipers, do you think putting 1.8 calipers on would help, or would it not be worth it until upgrading to multi-piston calipers?
Ben, you say uneven pad wear is a symptom of single piston calipers, do you think putting 1.8 calipers on would help, or would it not be worth it until upgrading to multi-piston calipers?
#46
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So in Wilwood's site it says its maximum setting (all the way screwed out I believe) is 57%. That means that when all the way screwed out, my rear brakes are at 57% of my front's, which is 3% less than my stock '93 proportioning valve, is this all correct? I have mine cranked all the way down (which means they're getting the same pressure as the fronts, right?) and I still can't get the rears to lock up first, its very frustrating.
Ben, you say uneven pad wear is a symptom of single piston calipers, do you think putting 1.8 calipers on would help, or would it not be worth it until upgrading to multi-piston calipers?
Ben, you say uneven pad wear is a symptom of single piston calipers, do you think putting 1.8 calipers on would help, or would it not be worth it until upgrading to multi-piston calipers?
First, what pads are you running? If you have a less aggressive compound in the rear, you'll lock fronts first all day long.
1.8 calipers are single piston too. I am looking into a Wilwood or AP Racing upgrade right now.
#47
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Wilwood Brakes, Hubs & Brake Lines
Chris
#48
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Sav,
Here's the three Wilwood options that looked best to me for a complete front system. You've seen it, it's at the end of your "do I need big brakes" thread.
https://www.miataturbo.net/forum/t33100-3/#post390723
Best prices I found for Wilwood are at Autofab race cars. They don't/can't publish them. Gotta email or call with the part #'s you want.
Found a company several weeks ago that makes maybe 50 models of aluminum caliper brackets. Of course I didn't bookmark them.... Gotta find them again. They are a likely prospect for getting something made for us cheap diy guys.
Here's the three Wilwood options that looked best to me for a complete front system. You've seen it, it's at the end of your "do I need big brakes" thread.
https://www.miataturbo.net/forum/t33100-3/#post390723
Best prices I found for Wilwood are at Autofab race cars. They don't/can't publish them. Gotta email or call with the part #'s you want.
Found a company several weeks ago that makes maybe 50 models of aluminum caliper brackets. Of course I didn't bookmark them.... Gotta find them again. They are a likely prospect for getting something made for us cheap diy guys.
Last edited by cueball1; 04-22-2009 at 11:43 AM.
#49
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are most people running theirs cranked all the way closed? I realize that everyone will be running different set-ups, just curious if most are using all the bias the prop valve has to offer.
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I'm running porterfield rs4 race pads on all four corners, so it's really bugging me that I can't lock up the rears. Locking the fronts is not a challenge what so ever. For $60 or so for used 1.8 calipers, It would be worth it for the longer prongs to help keep down on the taper pad wear.
#52
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The Miatas when running a decent suspension, 15x9's with race tires and a wing can use a surprising mount of rear brack. Top stock class autocrossers have been known to run a softer pad in rear. The OGK has a Wilwood BBK with 11" rotors front and rear running XP12's F & R also. With that combo, I'm finally able to run the prop valve somewhere other than wide open (max rear).
For most guys with Spec Miata-ish set ups, one compound softer in front like 10/8. For the really fast winged cars I'm recommending 12/12.
For most guys with Spec Miata-ish set ups, one compound softer in front like 10/8. For the really fast winged cars I'm recommending 12/12.
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