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Old 05-24-2013, 10:12 PM   #1
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Default flywheel weight

So I am finally getting ready to finish my engine build and am starting to think I might be ******* up so I am asking for your advice. The car is a daily driver first and foremost so driveability is paramount. I am married and this will be driven by my wife a lot, she is bitchy on good days and will make my life hell if the car is too twitchy or difficult to drive.

The engine is a ported VVT head with +1 valves on 8.6:1 pistons. This engine will have an EFR6258 on it in front of a 6 spd with 3.9 rear.

My question is this, what weight flywheel would you recomend and why.

The car is currently bone stock. My 94 has a complete VVT engine from a 2002 miata with a 11 lbs flywheel and it is a lot harder to launch than the stock 10AE. I bought a ACT prolight (9lbs) flywheel but am rethinking my decision. While I would love the quick revs but fear I am building a car that is not as much fun to drive daily.

Thank you for your input.
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Old 05-24-2013, 10:25 PM   #2
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Imo, a clutch has a much bigger effect than a flywheel on driveablity. And all turbo clutches are much worse than the stock clutch (which is pretty much weightless).

A light flywheel just makes it harder to tune PID idle
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Old 05-24-2013, 10:38 PM   #3
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I bought a slightly used clutch before I decided to do it right the first time. It is rated for 350tq I think. I hope it last for a while.....I am not going to push it hard on a regular basis. This is my wifes daily driver that I will take to the mountains on the weekends and will keep the boost down to make about 270ish whp. My next clutch will be the FM happy meal. I want a full disc sprung clutch for easy engagement. That is what the clutch I have is and the guy I bought it from (here on MT) said it has a very stock feel with only slightly stiffer pedal. I am also building a high compression NA motor for the 94 and am thinking the 9# ACT flywheel might make more sense in there? I don't mind a slightly higher idle but need a civil car...... I have no idea what to expect with this build and worry a little that the lower compression engine might not be happy with the reduced inertia.....
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Old 05-25-2013, 12:12 AM   #4
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k let me rephrase it

your engine will not care about what flywheel is attached to it.

ANY clutch rated to hold 2-3 times the stock torque will NOT have stock engagement. It will either have a much heaveir pedal, a different engagement window, or any combination of the above. you and your wife will get used to it very quickly.
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Old 05-25-2013, 12:47 AM   #5
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I hated my ACT.
I was okay with the FM2.
Flywheel wise if daily driver the answer is simple = stock flywheel. Nothing will be as smooth.
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Old 05-25-2013, 12:54 AM   #6
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Quote:
Originally Posted by 18psi View Post
I hated my ACT.
I was okay with the FM2.
Flywheel wise if daily driver the answer is simple = stock flywheel. Nothing will be as smooth.
But Vlad, we all know you're a flapping vagina, so of course you hated it.
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Old 05-25-2013, 01:15 AM   #7
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<-- 6-puck+light weight flywheel.

Will never do it again.

I'm buying an FM2 clutch next week with the heavy flywheel.
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Old 05-25-2013, 02:03 AM   #8
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Quote:
Originally Posted by soviet View Post
But Vlad, we all know you're a flapping vagina, so of course you hated it.
I like to not be sweaty and tired when driving my street cars, because they don't replace my wimminz
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Old 05-25-2013, 02:09 AM   #9
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Quote:
Originally Posted by 18psi View Post
I like to not be sweaty and tired when driving my street cars, because they don't replace my wimminz
dude, you have no idea
but if you're tired from using a high clamp load pressure plate, perhaps you shouldn't be driving during your critical days.

Quote:
Originally Posted by viperormiata View Post
<-- 6-puck+light weight flywheel.
^ 1.6shitty and a 60lb/min turbo



yeah, i'll trust your opinion on clutches/flywheel. not.
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Old 05-25-2013, 02:27 AM   #10
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yeah well I was supercharged when I did th....oh wait, I'm not helping myself.
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Old 05-25-2013, 03:15 AM   #11
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ACT Clutch was never a option for me. I will do the FM2 clutch when that time comes but was thinking I should do the stock flywheel for "smoothness" as Vlad describes. It is not just about being able to drive the car but having a smooth daily driven car as well. So the ACT Prolite flywheel will go on my NA engine with ITB FTW.....
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Old 05-25-2013, 03:26 AM   #12
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Quote:
Originally Posted by soviet View Post
dude, you have no idea
but if you're tired from using a high clamp load pressure plate, perhaps you shouldn't be driving during your critical days.


^ 1.6shitty and a 60lb/min turbo



yeah, i'll trust your opinion on clutches/flywheel. not.
Welp you're the expert on miata's around here so we'll all trust your opinion.....wait no we won't cause no you're not. lol
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Old 05-25-2013, 12:57 PM   #13
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Quote:
Originally Posted by Amellrotts View Post
ACT Clutch was never a option for me. I will do the FM2 clutch when that time comes but was thinking I should do the stock flywheel for "smoothness" as Vlad describes. It is not just about being able to drive the car but having a smooth daily driven car as well. So the ACT Prolite flywheel will go on my NA engine with ITB FTW.....
For what it's worth I had a stock flywheel and went to 8.5lb flywheel and stock clutch. I felt, realistically, no difference. I know have a FM level one and the same light weight flywheel and I still don't notice a difference...even going from my car to thirdgen's car which I believe is the FM level 1 and stock flywheel. Only thing I notice is maybe it rev's a tiny bit faster in neutral, and its a little bit noisier when pulling away from a stop.
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Old 05-25-2013, 02:33 PM   #14
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I notice a HUGE difference between the 11# flywheel and the 19# flywheel. So does the wifey. Am I really alone here? I wanted the quick revs to get me in boost faster but now I am concerned about driveability issues.
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Old 05-25-2013, 02:49 PM   #15
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lower inertia doesn't get you into boost faster. quite the opposite actually. less load = less exhaust = less boost/spool

you're not alone. I've preached stock flywheel to all daily driven cars around here for years. fgts like soviet who daily drive "RACECAR" make fun of me but that's because they're frustrated closet gays who make up for their ***** size by removing ps and ac and calling themselves manly men.

ILU soviet
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Old 05-25-2013, 03:12 PM   #16
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you require AC to cool down your multiple layers of fat, its ok, I understand.

btw I never said that a light flywheel is manly. I said it makes no difference in driveability.
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Old 05-26-2013, 12:02 AM   #17
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You want this clutch. Its whats in my car. If no one told you any different you'd think it was a stock clutch with a light flywheel. Its not as light as the 949 super clutch but its the next lightest off the shelf clutch/fw setup. While its rated to 300ftlbs, I spoke with brian goodwin about it and he told me that they were actually pushing more out of that in one of the shop cars with no problem. At worst you could most likely call speed sport and have them make you one with a stiffer pressure plate. If I ever need to replace this clutch I'll likely do that, because the clutch pedal feels too light to me. Even though "replacing the clutch" involves pulling it out and replacing 16 carbon pads and putting it back in.

The 2 things I dont like about it is that the clutch pedal is lighter effort that I'd like now that I'm used to the wrx leg press machine stock clutch. And they packed it with the wrong clutch tool. But its just about as easy to drive as a stock clutch and fw, maybe needs a touch more revs but its so easy to modulate and predictable that I dont notice.
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Old 05-26-2013, 12:47 AM   #18
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I just recently installed the 949racing "Sport" clutch with flywheel.
SuperMiata Sport Clutch Kit Miata BP

I really like it. Different engagement feel, but not appreciably harder to drive.

I have stalled it twice, but that is me avoiding slipping the clutch while in the 500 mile break in.
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Old 05-26-2013, 01:59 AM   #19
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Quote:
Originally Posted by soviet View Post
dude, you have no idea
but if you're tired from using a high clamp load pressure plate, perhaps you shouldn't be driving during your critical days.


Full-face disc = lightweight flywheel
Pucked disc = stock flywheel
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Old 05-26-2013, 04:11 AM   #20
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Make sure you get an unsprung disc too.
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