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Old 07-16-2013, 07:23 AM   #21
focusstu
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Originally Posted by BetaDnB View Post
This clutch engages super high on everybody's MTX75 equipped MK3.
The clutch on my 2007 Mazda3 i engaged even higher and much more abruptly. It did have 90,000 miles on it though.
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Old 07-16-2013, 03:47 PM   #22
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Hey figured I'd chime in here.

I too have a 5spd, and it does rattle with the clutch engaged in neutral.

This is because they are using a dual-mass flywheel on the 5spd's, not sure if in the autos.

If you aren't familiar with dual mass flywheels, think of instead of a single round metal plate (single-mass), it has two plates that are held together by a torsion spring so they can rotate a little semi-independent of each other; but not too far.



The idea is to make it a smoother feel when normally driving. As you engage the clutch against the outer flywheel, the engine rotates the inner plate, as it is bolted to the engine, but not the outer plate yet. As the inner plate pulls against the spring, it begins to rotate the outer plate, which then slowly rolls the power into the trans.

Nice for a smooth feel, CRAP for performance. This is part of the reason putting the power to the ground feels so rubbery; that and the lag in the throttle-by-wire.

As for the rattle, it *is* normal, to an extent, with DMF's. However, a brand new car shouldn't rattle, unless they have used a really cheap set up. (I suspect it is cheap and has weak springs. Many modern luxury and performance cars like Audi's and BMW's use them, but they are much more beefy and can handle more HP while still staying solid yet smooth) I do drive aggressively and have noticed that now that I'm at 8k miles, its rattling more.

A single-mass flywheel would be awesome; not to gain more power, but to improve how solid the car feels when accelerating.

So yeah, save your money, it's not your throw out bearing or clutch.
Though, if your were able to convert it to a single-mass flywheel, might as well upgrade the clutch while you're in there.

hope that helps.

J.
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Old 07-16-2013, 03:58 PM   #23
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Originally Posted by JeremiahD View Post

I too have a 5spd, and it does rattle with the clutch engaged in neutral.

This is because they are using a dual-mass flywheel on the 5spd's, not sure if in the autos.
The MTX75 has rattled with the clutch engaged in neutral since it's first appearance in 1995--due to gear rollover. My 2012 MTX75 makes the same noises as my 2001 MTX75, but the 2012 is actually much quieter. The MTX75 was paired with a solid flywheel before 2012, so I find it hard blame the dual-mass flywheel for the noise.

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Originally Posted by JeremiahD View Post
Though, if your were able to convert it to a single-mass flywheel, might as well upgrade the clutch while you're in there.
True, especially considering that you will have to swap out the clutch if you convert to a solid flywheel.
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Old 07-31-2013, 06:38 AM   #24
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I went to dealer and let a master tech beat on my car (as a friend, know him) and the slip going into second is the flywheel doing what it's supposed to. That's why it doesn't slip all the time. If you look up the design it's almost like a torque converter but in an opposite way. When the flywheel isn't spooled up, it will absorb the torque of shifting into second. It's some bull spit as it wastes a good chunk of power especially if you shift into second at peak torquw
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