anyone going to try 949's brake upgrade? - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 04-21-2009, 12:06 AM   #21
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And you guys need to chill out a bit.

Shut your mouth.
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Old 04-21-2009, 12:34 AM   #22
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I just installed Porterfield RS4 race pads with some used (turned) rotors. I have 1.8 brakes with 1.6 calipers. It sat for a while outside in the rain before I drove it, and the rotors rusted. No biggie, I know it wears off, but the new pads haven't worn off the rust on the inside of the friction surface on the front rotors. This is exactly how the last two sets of Hawk HP+ pads wore, they came off the car in a wedge shape, with a lot of wear on the inside of the pad, with about 30-40% on the outside.

Does anyone think that maybe running the 1.6 calipers with the 1.8 rotors/pads/caliper brackets is a bad idea? Or are the calipers EXACTLY the same? it appears the little "prongs" that press on the pad might be too short, or bent. Said prongs are circled in red. Not my car, if anyone wants to see the proof of my non-derusted rotors, I can take a pictures tomorrow when its light out.

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Old 04-21-2009, 12:36 AM   #23
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I thought that was a known issue, and that the 1.8L front calipers should be upgraded along with the brackets.
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Old 04-21-2009, 02:21 AM   #24
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FM has a tech article on their site RE: prop valves. Read it.
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So the prop valves are different between a 1.6 and 1.8 NA? I already have 1.8 brakes front and rear on my 90.
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Since those instructions were too difficult. Here's me holding your hand and walking you to your answer.

Flyin' Miata : Tech: Stock proportioning valve information
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Anyone?
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you guys need to chill out a bit.


I can't believe you were treated so kindly! You ignored everyone trying to help you, seemed to refuse to do anything yourself and then came up with "anyone" when all the answers were spoonfed to you. This ain't Mnet. You'll get your peepee spanked when you are being a complete idiot.

Post up a vid on youtube of you punching yourself in the face several times and some around here might actually try to help you again. Otherwise I think you are out of luck getting help in the future.
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Old 04-21-2009, 02:29 AM   #25
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I thought that was a known issue, and that the 1.8L front calipers should be upgraded along with the brackets.
If that's the case I'll be buying some used 1.8 calipers, I don't wanna ruin my new pads. Can anyone else varify?
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Old 04-21-2009, 03:17 AM   #26
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Maybe I should stop posting while trying to study for finals, I promise I'm not normally this retarded!!
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Old 04-21-2009, 03:21 AM   #27
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If that's the case I'll be buying some used 1.8 calipers, I don't wanna ruin my new pads. Can anyone else varify?
What I read up on was mainly about the pads sitting properly between the caliper and the bracket. I believe the larger pads have different tabs on them.

It was also noted that the 1.8L calipers have longer fingers on them.

Between the two I decided it was best to find a set of calipers with brackets to do the upgrade.
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Old 04-21-2009, 04:30 AM   #28
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If you need 1.8 calipers let me know, a friend of mine parts out and builds spec Miatas as well as other track prepped cars, usually has 8-10 Miatas on average for parts. I actually need to head up there this week due to a cracked rear rotor and could pick some up if needed. It's almost an hour one way, so I try to not drive up too often. I think I might hit him up for some 1.8 prop valves if anyone is interested.
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Old 04-21-2009, 05:15 AM   #29
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If that's the case I'll be buying some used 1.8 calipers, I don't wanna ruin my new pads. Can anyone else varify?
Unless my '94 has 1.6 calipers for some reason, I get the same wear issues if I get the brakes REALLY hot. I am able to wear street pads evenly, and I wore a set of Raybestos ST-43s and half a set of Carbotech XP12s evenly, but once I started going really fast the brakes overheated and I warped backing plates on 3 sets of pads. I need to pull the front brakes apart again (4th or 5th time in 4 weeks), replace the pads, and see how they wore at Buttonwillow.
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Old 04-21-2009, 01:41 PM   #30
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The % values shown in the chart are % front bias, yes?
I can't get it to load at work, but it should tell you what % of pressure goes to the rear compared to the front. The rears get less than the front, hence "front bias". With too little front bias, you risk spinning your car like a top when apply the flaps.
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Old 04-21-2009, 01:52 PM   #31
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Originally Posted by Savington View Post
Unless my '94 has 1.6 calipers for some reason, I get the same wear issues if I get the brakes REALLY hot.

The calipers from the 90-97 are the same IIRC.

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Originally Posted by Ben View Post
I can't get it to load at work, but it should tell you what % of pressure goes to the rear compared to the front. The rears get less than the front, hence "front bias". With too little front bias, you risk spinning your car like a top when apply the flaps.
Code:
Year                balance
1990-93                60%
1994-97, no ABS       70%
1994-97, ABS          80%
2002, no ABS          82%
2002, ABS      No proportioning valve
2006, no ABS          75%
2006, ABS      No proportioning valve

In it's lowest setting the Wilwood proportioning valve puts the rears at a 57% reduction, i needed more still, but it was an improvement over the stocker.
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Old 04-21-2009, 01:55 PM   #32
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The calipers from the 90-97 are the same IIRC.


If so then there was a thread here a few months back that is misinforming folks.

I read in more than one instance that I should get the 1.8L* calipers as well as the brackets to avoid funny wear on the pads.
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Old 04-21-2009, 02:05 PM   #33
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My '92 and '95>96 FSM show the same part number for the "body & piston"

NA75-33-71X
NA75-33-61X
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Old 04-21-2009, 02:08 PM   #34
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Cool, thanks, I won't worry about sourcing calipers then.

So you're running the original 1.6L calipers with your Corrado rotors no problem?

This is the exact setup I'm shooting for.
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Old 04-21-2009, 02:30 PM   #35
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correct. 1.6L calipers, 1.8L brackets & pads, and corrado rotors.
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Old 04-21-2009, 02:31 PM   #36
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I get the angled wear at track days also. Stock 94 calipers and brackets. In my research into upgrading to bigger calipers many of the 6 piston units have varied size pistons from the front to back to prevent this. Savington had posted up a really good pic showing this wear pattern. Mines never been quite this extreme and is as much front to back as top to bottom!

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Old 04-21-2009, 02:32 PM   #37
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Quote:
Originally Posted by zoomin View Post
If you need 1.8 calipers let me know, a friend of mine parts out and builds spec Miatas as well as other track prepped cars, usually has 8-10 Miatas on average for parts. I actually need to head up there this week due to a cracked rear rotor and could pick some up if needed. It's almost an hour one way, so I try to not drive up too often. I think I might hit him up for some 1.8 prop valves if anyone is interested.

There you go redeeming yourself. Good job!
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Old 04-21-2009, 02:32 PM   #38
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I wish I took a picture of mine. i've gone to the backing plates on the track (ebc redstuff @ 170rwhp), but it was perfectly even wear.
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Old 04-21-2009, 02:34 PM   #39
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Quote:
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correct. 1.6L calipers, 1.8L brackets & pads, and corrado rotors.
Thanks again for the clarification.

Looks like some guys are just too hard for any Miata calipers on the track.
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Old 04-21-2009, 03:53 PM   #40
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Quote:
Originally Posted by cueball1 View Post
I get the angled wear at track days also. Stock 94 calipers and brackets. In my research into upgrading to bigger calipers many of the 6 piston units have varied size pistons from the front to back to prevent this. Savington had posted up a really good pic showing this wear pattern. Mines never been quite this extreme and is as much front to back as top to bottom!

That's exactly how my last two sets of tracked HP+ pads have looked, there's a lot of life left in that pad if it wore evenly.
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