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Old 08-21-2007, 08:04 PM   #1
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Default ACT clutch/flywheel

I believe I've narrowed my mind down to the ACT Extreme Sprung Hub Street Performance Kit, part number ZM1-XTOO (http://carolinaclutch.com/ShowItem/101374.aspx). Torque capacity of 277 ftlbs-I'm midway making my own DSM t25 kit but I want to leave myself some room to grow power-wise. Will this clutch be sufficient for my needs? Car is also a DD so that rules out a straight race application, and most of the racing the car will see is local autocross/track days. I read a lot of topics on the forums here, at miata.net, and at clubroadster.net, and from what I read (though nothing is 100% conclusive from any forum) that I will be happier with a 1.6 clutch/flywheel combo than a 1.8 one, simply because of the lighter weight. I definitely want some feedback on this, I can't stand how threads are always split 50/50 among the opinions of members. I searched carolinaclutch.com for a matching flywheel but couldn't find one, and after some searching I found a flywheel for my 1.6L kit, http://www.raceinspired.com/pc-2819-...1989-1993.aspx. The ACT prolite seems a good choice because its manufactured from steel and although it's light (at 9 lbs) it should be more durable than an aluminum flywheel like those from Fidanza, etc. Lemme know what you guys think-and if you know of a different kit or a different store to order from, it'd be greatly appreciated.
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Old 08-21-2007, 08:13 PM   #2
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you will be just fine 277 lbft is alot i doubt you max it out in autoX. I like my XD but i kinda wish i had a sprung hub clutch instead of my unsprung puck clutch
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Old 08-21-2007, 08:17 PM   #3
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let's pretend you get that clutch and make 250rwtq at redline....that's 333rwhp....

I would have no worries with that thing.
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Old 08-21-2007, 08:54 PM   #4
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Just a thought....if you are getting a flywheel as well, why not upgrade to a 1.8 setup? The same kits for the 1.8 are rated for more power due to the increased size of the clutch.
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Old 08-21-2007, 09:00 PM   #5
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I am not sure that the ACT chromium-molybdenum flywheel is any stronger than a Fidanza 6061 T6 aluminum flywheel. Chromium-molybdenum is a super hard ferrous steel alloy. Harder typically also means more brittle. Plus it's ferrous so oxidation can be a problem. Also, the structure is going to be a lot more open where the ACT is mostly solid.

I'm no injuneer, I could be wrong. Probably real world, they're both better than required.
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Old 08-21-2007, 09:02 PM   #6
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I have that clutch...I actually picked it up from the CarolinaClutch office in Belmont NC...great guys, good prices. I like the way it feels. Stock disc, XT plate...slips a bit, drives nicely. I have it paired with a 9lb JUN flywheel...its easy to drive.
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Old 08-21-2007, 10:04 PM   #7
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Thanks for the quick replies, should my goal be to find the lightest flywheel or something mid-way? http://www.good-win-racing.com/Mazda...t/15-1008.html is only 7 pounds, CNC-manufactured from 6061-T6 aluminum.
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Old 08-21-2007, 10:13 PM   #8
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normal flywheel is just fine light flywheel is something of an aquired taste. most here don''t like them i am of the opinion that it does not matter with boost as much + I am cheap so resurfaced OE for me anyday.
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Old 08-21-2007, 10:26 PM   #9
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You'll find varying opinions. Personally, after trying a few, I like the lightest flywheel possible. The drawbacks, IMO, are far overshadowed by the advantages.

I've driven both NA and FI miatas with a variety of flywheels.
My current flywheel is a lightened stock 1.8 wheel. If I could do it again, I'd have dropped the cash on something shiny and light.

I actually have an extra 7lb 1.6 Fidanza, but my clutch is 1.8 so I can't use it.
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Old 08-21-2007, 10:31 PM   #10
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Sweet, interested in selling it? If not I found the 8 lb brand new in box on ebay for $275. I'm pretty sold on the Fidanza after talking with a friend who owns one.
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Old 08-21-2007, 10:58 PM   #11
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I have the Fidanza flywheel on mine, and I love it. Now that I have idle recovery dialed in with a variable TPS, the unfortunate idle droop is long gone, and the only disadvantage left is driveline chatter. For those that say it doesn't matter with boost...well, I don't get it.
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Old 08-22-2007, 01:49 AM   #12
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Fidanza here too, love it. No noticeable chatter.
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