Best brakes for Miata uprights?
I am building another Locost with Toyota 2JZ motor, and need to decide uprights and spindles soon. I am familiar with Wilwood brakes and I have a feeling that this car will need big ones. The owners of big brake kits, educate me with pro's and con's of the Miata package. The alternative uprights and spindles would be Mustang. s2000, corvette. But I know what to do geometry wise with Miata, availability is good, and I have basic spares. I would not mind having fifth bolt and beefier bearings, but so far it hasn't been a problem.
Road race is probably the hardest thing these brakes will have to endure, hillclimbs being shorter are easier on brakes. If you are interested of the project check out http://2jzlocost.wordpress.com Thank you for your suggestions. |
A member here has commissioned us to build him a BBK that hasn't been seen on a Miata yet. Depending on what wheel you want to use (15s depending on size/offset and most 16s), it may fit your project as well. I don't want to say much more in public, but PM/email me for details.
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Didnt bundy determine that you could fit mini cooper brakes on the front of the car pretty easily that gives you the stiffer dynapros in 11.75 and 12.19 fitment in the front. In the rear anything off the shelf tops out at the same size as sport brakes, but someone does sell a 2 piece rotor for sport rear brakes that uses some 8 bolt pattern so maybe larger brakes can be an option there with different brackets.
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Originally Posted by Leafy
(Post 1196394)
Didnt bundy determine that you could fit mini cooper brakes on the front of the car pretty easily that gives you the stiffer dynapros in 11.75 and 12.19 fitment in the front.
In the rear anything off the shelf tops out at the same size as sport brakes, but someone does sell a 2 piece rotor for sport rear brakes that uses some 8 bolt pattern so maybe larger brakes can be an option there with different brackets. |
whats the cross weight?
tire size? compound? Goal for horse power? what kind of master cylinder are you planning on running, oe? - from what car? or Dual master cylinder pedal? my qualifications - https://www.miataturbo.net/general-m...estions-81577/ |
OGRacing,
The car is not done yet, - based on driveline and existing experience gross weight will be 1700-1900 lbs in running condition. - Tire size will dictate wheel size. I like to get used tires for local races. Formula Enterprise uses 13" x 10 hoosiers in the rear, and they are cheap and plentiful to run for a weekend, but I haven't found brakes which would fit inside those wheels. Next common slicks would be 15" and this may limit brakes too. Compound softest possible for short run hillclimbs. -hp goal, 700 should be close from 2JZ single turbo. -dual master assembly, cylinder diameter selection based on brake caliber needs. The goal is to keep wear item costs down, tires, brake pads, balljoints, bearings and have available parts in the future. Thanks |
Originally Posted by hrk
(Post 1196492)
OGRacing,
The car is not done yet, - based on driveline and existing experience gross weight will be 1700-1900 lbs in running condition. - Tire size will dictate wheel size. I like to get used tires for local races. Formula Enterprise uses 13" x 10 hoosiers in the rear, and they are cheap and plentiful to run for a weekend, but I haven't found brakes which would fit inside those wheels. Next common slicks would be 15" and this may limit brakes too. Compound softest possible for short run hillclimbs. -hp goal, 700 should be close from 2JZ single turbo. -dual master assembly, cylinder diameter selection based on brake caliber needs. The goal is to keep wear item costs down, tires, brake pads, balljoints, bearings and have available parts in the future. Thanks |
Originally Posted by hrk
(Post 1196492)
- based on driveline and existing experience gross weight will be 1700-1900 lbs in running condition. -hp goal, 700 should be close from 2JZ single turbo. Is this car for yourself or building it for a customer? I'm curious how much a project like this costs. |
Well, racing brake does make a 2 piece rotor for the rear. I don't know about a larger rotor being possible. Any it depends on your opinion of racing brake which seems to be a mixed bag.
Someone needs to be completely dumb and create a carbon rotor that will fit under 15 inch wheels. unless maybe such a thing exists and I don't know about it? |
I would choose suspension based on the merits of the design not available brake packages. The Miata double wishbone is gonna be tough to beat in a 1,700lbs car.
Even with a 700whp motor the current 11.75" offerings should satisfy your needs in a 1,700-1,900lb chassis. Who knows what Sav has up his sleeve. That could be the excess you're looking for. Sounds like a fun project! |
Originally Posted by kaisersoze
(Post 1196528)
Someone needs to be completely dumb and create a carbon rotor that will fit under 15 inch wheels. unless maybe such a thing exists and I don't know about it?
http://www.frenocarbon.com/files/Price%20List.pdf Thick discs will move rotor center outwards (steering knuckle in the way). Unsure if their 21mm rotor would work up front. Carbon discs are hard(er) to find info on, since most list them consulting items. There are many smaller rotors in use on formula cars, but then we are talking different uprights, bearing packages etc. |
Originally Posted by NiklasFalk
(Post 1196665)
Only 280mm but...
http://www.frenocarbon.com/files/Price%20List.pdf Thick discs will move rotor center outwards (steering knuckle in the way). Unsure if their 21mm rotor would work up front. Carbon discs are hard(er) to find info on, since most list them consulting items. There are many smaller rotors in use on formula cars, but then we are talking different uprights, bearing packages etc. |
We should have some pics of a BBK using lotus calipers and their...11.5"(?) rotors soon. If that helps anyone.
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Originally Posted by Savington
(Post 1196431)
No...
...no... ...no. Nobody yet has come out with an aftermarket production kit yet that is better for a High hp and heavy miata that easily fits in most commonly used 15" miata wheels. Looks like V8R maybe finally coppied it by using dynapro radials however. Dynalite calipers suck compared to the Dynapro Radials and you get 50% longer pad life via thicker pads. |
V8R is currently using Dynapro lug mount calipers on their kits. Both V8R and one other company I know of are working on a Dynapro radial mount kit in 2015, but radial vs. lug isn't a significant difference.
-Ryan |
Originally Posted by ThePass
(Post 1196801)
V8R is currently using Dynapro lug mount calipers on their kits. Both V8R and one other company I know of are working on a Dynapro radial mount kit in 2015, but radial vs. lug isn't a significant difference.
-Ryan |
Exactly
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nobody is really hitting on the point of how to slow a 1500lbs 500-800hp vehicle..
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Originally Posted by OGRacing
(Post 1196824)
nobody is really hitting on the point of how to slow a 1500lbs 500-800hp vehicle..
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^bazinga
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Originally Posted by OGRacing
(Post 1196824)
nobody is really hitting on the point of how to slow a 1500lbs 500-800hp vehicle..
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4 Attachment(s)
Originally Posted by Leafy
(Post 1196802)
I theory the radial mounted will be stiffer since the studs clamping them to the bracket should flex less than the ears of a lug mount. In reality if your brackets are the same material and ~thickness as the ears its probably not as much of a difference as it could be.
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Bob I know this. I was talking about dynopro radial vs dynopro lug.
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2 Attachment(s)
Originally Posted by Leafy
(Post 1196854)
Bob I know this. I was talking about dynopro radial vs dynopro lug.
https://www.miataturbo.net/attachmen...ine=1421359029 https://www.miataturbo.net/attachmen...ine=1421359029 |
Originally Posted by ThePass
(Post 1196848)
In a hill climb? Plenty of options. Rocks, trees, spectators...
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I believe radial mounts get their extra flex strength from the bracket. By the time you hollow out a caliper for pistons etc there is not much strength left in the body. The inside edge (closest to hub) is the weakest part. Through bolting a hunk of material to one side dramatically increases the flex resistance of that side. If you look at radial flex videos you'll notice the radial mount side stays put while the outside flexes.
The only potential concern would be how that one side flexing affect wheel bearings etc. I am still running the wilwood dynalights. I welcome a new caliper that does not flex as much. Maybe Stoptech will release their new one this year. |
Originally Posted by bbundy
(Post 1196770)
Nobody yet has come out with an aftermarket production kit yet that is better for a High hp and heavy miata that easily fits in most commonly used 15" miata wheels.
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Originally Posted by Savington
(Post 1196968)
The kit I referenced in post 2 should fit this description.
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Originally Posted by k24madness
(Post 1196936)
I believe radial mounts get their extra flex strength from the bracket. By the time you hollow out a caliper for pistons etc there is not much strength left in the body. The inside edge (closest to hub) is the weakest part. Through bolting a hunk of material to one side dramatically increases the flex resistance of that side. If you look at radial flex videos you'll notice the radial mount side stays put while the outside flexes.
The only potential concern would be how that one side flexing affect wheel bearings etc. I am still running the wilwood dynalights. I welcome a new caliper that does not flex as much. Maybe Stoptech will release their new one this year. |
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