This is for a street car that gets autocrossed occasionally. The engine is stock. I'd like a high quality clutch and maybe a lightened flywheel. I'm leaning towards the FM stock replacement clutch and the 10.3 lb flywheel, but am open to suggestions, especially from Keith. The car may get a header and air intake in the future, but that's about it. What say you?
1.6 stuff. 1.6 Fidanza and an Exedy "Stage 1."
Otherwise, FM stuff if you stay with the heavier 1.8 stuff.
In reply to Swank Force One:
Are you saying that there is a benefit to using parts intended for a 1.6 on a 1.8?
Yep. Lighter and smaller diameter = less inertia = faster revs. You're talking a 7lb flywheel and a lighter clutch.
I have a similar setup, but ACT HDR4 clutch on mine. I love it.
My last two cars had the FM package with 10.3lb flywheel. It's a nice setup. Doesn't rev near as fast as this. The FM stuff makes less noise, though, so probably a better choice if nvh is a concern.
In reply to Swank Force One:
But would that be good for a daily driver (your 7lb setup)? I also noticed they mentioned noise on the FM website. What kind of noise can a flywheel make?
I know the happy meal kit is good for daily driver duty as well. For the money I think is the best all around kit you can get
In reply to bravenrace:
I'm daily driving mine right now. The car sucks for daily uses anyways, the clutch doesn't change that for the worse.
Noises can be a rattle or humming, particularly under decel. My setup "talks" a bit but there was some noise with the stock stuff to due to my motor/diff mounts. The FM kit on my car would be noisier than stock.
Didnt notice any huge increase in nvh with the FM kit on the last two cars, they just had mazdacomp motor mounts and poly diff mounts.
In reply to Swank Force One:
Where does the noise come from? Is it just from additional vibration? Still can't get my head around the idea of a flywheel itself making noise.
Yes, vibration. Smaller mass = less damping = more vibrations transmitted elsewhere.
I'm not familiar with the math behind it, but every car i've had a REALLY light setup on made some noise.
To be clear: i'm not saying that the flywheel itself is MAKING noise, just that it's not preventing as much noise/roughness as a stock one would. Just like removing rotating mass doesnt MAKE power, but you can put more to the wheels anyways.
I just put an Exedy 10805 (Stage 1) on my 99, it works just fine, and price was reasonable. A bit more torque capacity than stock. I intended to have the stock inertia ring cut off the flywheel when I had it surfaced, but two local shops couldn't, or wouldn't do that.
To do it again I'd just get the happy meal + flywheel and be done with it. What I did love was the shifter rebuild kit with the bronze bushing from 5X Racing. Totally changed the shifter/tranny feel.
Mass and damping aren't the same thing. Less mass will increase the frequency of a resonance, making it more noticeable or more annoying. To damp you need to remove work from the system. You'll see some (most) clutches with a sprung hub, this can soften feedback as well by changing stiffness. The all-out racing clutches are solid.
10 pounds sounds fine for a daily. You might get some chatter when the clutch is disengaged at a stop, but its nothing crazy. Most car people dont even notice the sound.
So is the consensus to use the FM clutch and flywheel? I could save a few bucks (about $70) by using their stock replacement (which I'm sure would be fine for this car) and 10.3 lb flywheel instead of the happy meal kit. Do you guys see a reason to spend the extra bucks?
On a stock car, a stock clutch and pressure plate will be fine, and probably have better pedal feel.
The FM1 might hold up to abuse better, but i'm sure the oem replacement will last plenty long for the money, and Miata clutch jobs aren't hard.
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