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> Yippee...problem solved...I've got big brakes :), up front at least for now :)
Andyrew
post Mar 20 2005, 03:51 PM
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Ya... I saw the wood, lol

Lookin good!

I need to talk to you about making some "adapters/spacers".....

Really, I like the look your giving that car!

Andrew
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soloracer
post Mar 20 2005, 05:19 PM
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I own a 1987 RX7 Turbo as do several of my friends. The funny thing is we all agree that the braking is the worst thing about the car. We've been looking for a brake upgrade for our cars and Porsche was one of the makes we were researching for parts. Guess we'll have to strike stock "914" brakes off the list... (IMG:http://www.914world.com/bbs2/html/emoticons/laugh.gif)
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Bleyseng
post Mar 20 2005, 08:43 PM
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Big diff between the NA and Turbo brakes IIRC on the 88-91 RX7's. Looks like the ones on Blair's Turbo2 car to me. Who needs brakes with all that boost!!!

Geoff
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ovilla
post Mar 21 2005, 12:50 AM
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Mueller - Great job on the set up. Definitely grind down the Mazda script and then order a set of Porsche vinyl stickers with Porsche lettering. Also, just curious, why worry about the overhang? Isn't the rotor thicker than both of the pads? In other words wouldn't the overhang material from each pad not touch the other pad anyway?
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Mueller
post Mar 21 2005, 12:10 PM
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QUOTE (soloracer @ Mar 20 2005, 04:19 PM)
I own a 1987 RX7 Turbo as do several of my friends. The funny thing is we all agree that the braking is the worst thing about the car. We've been looking for a brake upgrade for our cars and Porsche was one of the makes we were researching for parts. Guess we'll have to strike stock "914" brakes off the list... (IMG:http://www.914world.com/bbs2/html/emoticons/laugh.gif)

this setup is close to the 944 Turbo combo, except I'll have a larger diameter rotor and an aluminum hat to help shed the heat.....for me, I think this will work out fine, it's got to be as good or better than most setups currently being run on 914s... (IMG:http://www.914world.com/bbs2/html/emoticons/biggrin.gif)


QUOTE
Also, just curious, why worry about the overhang? Isn't the rotor thicker than both of the pads? In other words wouldn't the overhang material from each pad not touch the other pad anyway?


You are correct, with the rotor being so thick, the pads could never touch each other due to the overhang.....I've talked to a few brake engineers...as with everything, they had different views on the overhang...a few didn't like the overhang and felt that the rotor wouldn't cool down properly and a few others felt it was no big deal...

For me, the over hang is very minimal and a quick pass on my bench grinder takes care of it and I still have maximum pad coverage on the rotor...
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Mueller
post Sep 6 2005, 02:03 AM
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QUOTE (Andyrew @ Mar 20 2005, 02:51 PM)
Ya... I saw the wood, lol

no more wood (IMG:http://www.914world.com/bbs2/html/emoticons/smile.gif)

started working on the real part today....will have to finish it once I get back from vacation in a week+ (IMG:http://www.914world.com/bbs2/html/emoticons/smash.gif)



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914efi
post Sep 6 2005, 10:05 AM
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Are you using larger wheels? When I did this I welded new mounts on the struts because I did not think the calipers would clear by using adapters such as you show.
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Mueller
post Sep 6 2005, 10:12 AM
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QUOTE (914efi @ Sep 6 2005, 09:05 AM)
Are you using larger wheels? When I did this I welded new mounts on the struts because I did not think the calipers would clear by using adapters such as you show.

yep, larger wheels...17" and larger diameter rotors, 12.25" instead of 11"

a 15" stock 4-lug Fuchs "almost" fits with the a wheel spacer added....if I ground down some of the ribs on the caliper, I think it would work...no big deal, but I'll have to figure something out for a spare and a second set of rims (don't want another set of Revolutions, too heavy for auto-x, but I don't mind them on the street)
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Brian Mifsud
post Sep 6 2005, 10:53 AM
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Hey Mike,

Spare is something you should take seriously. I put Mustang Cobra (13" rotors) on my Mustang GT. I had bought the 17' rim option on new purchase, but the spare was stock for the GT and V6 and won't clear the 13" rotor/caliper combination.

When I blew out a sidewall on a front tire, I had to do this ridiculous balancing act of lifting the front, remove flat, shove the wheel under the car to block it up, then go jack up the rear to move the rear forward, then put spare on rear..

Ford makes a 17" spare for the Cobra, but they are hard to get because all the Cobra drag racers buy them up to use as lightweight (aluminum) front skinnies...


Maybe a redrilled Porsche 16" spare?
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phantom914
post Sep 6 2005, 11:46 AM
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Mike,

What are the piston diameters on these calipers?

Andrew
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Mueller
post Sep 6 2005, 12:30 PM
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QUOTE (phantom914 @ Sep 6 2005, 10:46 AM)
Mike,

What are the piston diameters on these calipers?

Andrew

4 X 35mm or 36mm......

The little "hump" underneath the MAZDA cannot be removed, it is for the fluid to move from one piston to the other...oh well (IMG:http://www.914world.com/bbs2/html/emoticons/dry.gif)

Brian, yea, I figured for the time being I'd do the same thing as you did on your 'stang and play musical tires (IMG:http://www.914world.com/bbs2/html/emoticons/smile.gif)

One good thing about all 4 tires and rims being the same size.........
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Andyrew
post Sep 6 2005, 02:53 PM
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Looking good!!

Took a while though... lol

Bet lots of projects... Ehem, I no nothing about multiple projects...
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Mueller
post Sep 6 2005, 05:04 PM
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QUOTE (Andyrew @ Sep 6 2005, 01:53 PM)
Looking good!!

Took a while though... lol

Bet lots of projects... Ehem, I no nothing about multiple projects...

yea, kind of embarrasing for it to take this long (IMG:http://www.914world.com/bbs2/html/emoticons/wacko.gif)

the final part should look like this...now I have to get McMark to get his anodizing kit working (IMG:http://www.914world.com/bbs2/html/emoticons/smash.gif)



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McMark
post Sep 6 2005, 10:18 PM
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It's ready to go as soon as I get some battery acid. I've even got "smoke" dye to use, but you can order your own dye. (IMG:http://www.914world.com/bbs2/html/emoticons/wink.gif)
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Kevin@ojai.net
post Sep 7 2005, 12:27 AM
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Mike,
Why didn't you finish the part? Didn't want to write extra lines of code to do the pockets? It wouldn't have taken up too much more machine time when it was already fixtured and located...

-Kevin
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Mueller
post Sep 7 2005, 09:26 AM
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QUOTE (Kevin@ojai.net @ Sep 6 2005, 11:27 PM)
Mike,
Why didn't you finish the part? Didn't want to write extra lines of code to do the pockets? It wouldn't have taken up too much more machine time when it was already fixtured and located...

-Kevin

I did that part manually on the mill, I'm having problems with the stepper motors stalling every so often while taking cuts, I "think" it's due to me running them at half winding or it's a setup problem with the computer.
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andys
post Sep 7 2005, 09:46 AM
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QUOTE (Mueller @ Mar 20 2005, 07:53 AM)
you like the wooden mock up?? (IMG:http://www.914world.com/bbs2/html/emoticons/smile.gif)

I was wondering when someone noticed it, hahahaha


rotors= $30 each
aluminum hat= $125 each (way too much, but you only have to buy it once and I know it can be made cheaper)
bolt kit for rotor= $15

I have not done a weight comparison yet, I'm going to try and do that Monday, my scale at home is not accurate enough.....

Say Mike,

Very nice and ingenious! Now, you didn't go with the Wilwood four pot's why? At just under $100 each (brand spanking new), seems they would have been a viable alternative (and lighter as well). Also, lots of pad compounds are available. On the plus side, those Wilwood rotors that you have are really inexpensive.

I have '89 Carrera calipers for mine, but am starting to wish I had gone with the Wilwood's. Those Carrera calipers weight a ton!

Andy
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Aaron Cox
post Sep 7 2005, 09:48 AM
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andy - give us a link to the wilwoods you mention
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BIGKAT_83
post Sep 7 2005, 10:44 AM
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Aaron I got these wilwood forged superlights for $103 each shipped to me. They are almost a bolt on for 3.5" struts. Wilwood brakes
(IMG:http://www.914world.com/bbs2/uploads/blog-1126110771.jpg)
Bob
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Mueller
post Sep 7 2005, 01:01 PM
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QUOTE (andys @ Sep 7 2005, 08:46 AM)
Say Mike,

Very nice and ingenious! Now, you didn't go with the Wilwood four pot's why? At just under $100 each (brand spanking new), seems they would have been a viable alternative (and lighter as well). Also, lots of pad compounds are available. On the plus side, those Wilwood rotors that you have are really inexpensive.

Andy

ummmm, stupidity I guess (IMG:http://www.914world.com/bbs2/html/emoticons/smile.gif)

I looked at the Wilwoods and even printed out 1:1 side and front profiles of them to layout against the /4 struts. Nothing seemed to that well at the time. If you notice the picture with the rotor, it is actually bolted "backwards" for 2 reasons...1st, the larger OD will clear the a-arm and 2nd, it allows me to use a simpler design adapter.

Now that I figured out that I could (and have to) move the rotor the direction I did, a few of the Wilwood calipers would have worked..oh well, live and learn.

The RX-7 calipers do have a few benifits such as cheaper pads than the Wilwoods and dust shields.

If I was to do it again, I'd go with Wilwoods and i still might for the rear brakes....still deciding if I'll go vented or stay solid rotor in the rear.

Bob, I have /4 struts which have the 3" spacing
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