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Old 06-22-2014, 06:41 PM   #1
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Default Lighten factory flywheel or eBay flywheel

OK I know I am going to get flamed for this, but please try to hold back unless you are running eBay 1.8 lightened flywheel or lightened 1.8 flywheel.

I have a 949 sport 1.8 clutch kit ready to go on the car. The original plan has always been to use the factory flywheel after a resurface, but lately I am wondering if I need to try something lighter. I was considering something like this.
FX Forged Chromoly Flywheel 94 05 Mazda Miata MX 5 1 8L 2004 05 mazdaspeed Turbo | eBay

But after searching around about eBay flywheels I don't have a warm and fuzzy about it. Recent scope increase has burned up all funds and a $300 flywheel is not an option. I was wondering if anyone has tried to lighten the 1.8 flywheel by removing the huge lip on the back of the flywheel. This could shave a few pounds and cost me $80 with the resurface included, at my usual machine shop.

I have read some reports of additional vibration and noise with these lightened flywheels, is this a problem with all lightened flywheels?

So, has anyone tried to lighten a factory fly wheel or had good luck with the FX Grip force 1.8 clutch listed above?

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Old 06-22-2014, 07:44 PM   #2
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I strongly recommend getting a lightly used Fidanza/Exedy/FM/949/not eBay for $200-300.
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Old 06-22-2014, 08:04 PM   #3
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Ebay is almost always going to be a risk. The fact is some claim to have good luck with parts on ebay, others have terrible luck, it seems to be just that: luck. You can take your chances and possibly be in for more money than you would have been if you just went the legit route first. Or you could be totally satisfied and have no issues.

As for lightening your stock flywheel, I know other cars that do it with great success, as long as it is balanced and not overdone I can't imagine it being a huge issue.
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Old 06-22-2014, 09:11 PM   #4
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I've lightened a 1.6 with great success. Mine was free , so no way the extra $300 for a few pounds was worth it.
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Old 06-22-2014, 09:12 PM   #5
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I Have a XTD flywheel bought from ebay since 2010 an not a single problem. Lots of racing miles on it without a single problem. Hope that helps.

Also have experience in one 1.8 lightened flywheel in one 2002 VVt without any problems. I think the reduction was about 1kg. Not really a big difference to be honest.
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Old 06-23-2014, 02:54 AM   #6
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Completely removed the lip on my stock 1.8 for $30. No vibration or additional noise noted after installation.
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Old 06-23-2014, 10:09 AM   #7
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I've had an ebay F1 racing 4130 flywheel in the WRX since the winter. It has yet to cut my feet off or do anything else disagreeable. Its pretty hard to screw up a steel flywheel.
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Old 06-23-2014, 11:10 AM   #8
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Having seen a shitty flywheel explode (granted on a bap bap rotor at 9k+ rpm), I'm inclined to steer clear in a racing applications though the risk is probably low. I bought a decent second hand Racing Beat alloy FW off this forum a cpl of years ago and it has been awesome, cost $150 shipped I think. Would go this way again given the patience to wait for the right one here, or on some less awesome that dare not speak its name forum.
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Old 06-23-2014, 02:38 PM   #9
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Quote:
Originally Posted by Radioheavy View Post
Completely removed the lip on my stock 1.8 for $30. No vibration or additional noise noted after installation.
Noticeable difference with the lip removed? Final weight?

About to do the same.
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Old 06-23-2014, 09:02 PM   #10
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1.6l clutch and junkyard flywheel is the poor way.
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Old 06-24-2014, 12:27 AM   #11
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My factory flywheel weighed 15.3 after the machine shop took that lip off. I think he was being conservitive. Pobably could have taken that last .3 off without trying too hard. I forgot to get a before weight but I've read they're 18-19 lbs.
I didn't notice much difference but I would do it again for the $45 I paid to have it done.
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Old 06-24-2014, 05:17 AM   #12
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You're not going to get a factory flywheel more than 3-4 pounds lighter than stock. My Fidanza flywheel is a full ten pounds lighter than stock and I would still go lighter if I could. If you have a couple hundred bucks already earmarked for a lightweight flywheel, there's no sense in dicking around with the stock one.
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Old 06-24-2014, 01:32 PM   #13
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I don't have the cash laying around for a $300 flywheel. Luckily I am not slipping the clutch I have in the car right now so I might just wait a little while longer to install the 949 sport clutch, sell a few more parts and get the real thing.
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Old 06-24-2014, 02:26 PM   #14
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Just shave the weight ring off. You're talking about $300 for 4-6lbs more, think about all the other things you could buy for that! Then think long and hard if you'd actually feel that difference, and/or care about it on a day to day basis.
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Old 06-24-2014, 04:37 PM   #15
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I'm talking about $200, which is the going price for a used flywheel, for more than double the effect. And if OP is paying $80 for a resurface and machining, he's already nearly halfway there.
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Old 06-30-2014, 01:55 PM   #16
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I just missed out on a ACT 9.4lb used FW this morning. After additional research I am leaning back to just using the factory FW. I run MS2 and need my AC for summers in the south. I already do not have the best idle and halfing the FW weight will not make my DD experience any more fun. I am just going to chicken out and run the full weight factory FW. Sure the quicker response and snappier heel-toes would be great, but it is not like I am having issues right now. Kinda wish I did the 1.6 clutch instead now, I have a factory 1.6 laying in a box.

Oh, well.
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Old 06-30-2014, 02:14 PM   #17
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Why are you opting out of shaving a few pounds off the OEM? I have the same concerns as you, not wanting it too light and went with a lightened and balanced unit. I think you'd be happy and still have plenty of $$$ in pocket after dropping the weight to like 15 or something. The steel vs aluminum is also less chattery I've heard.
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Old 07-01-2014, 06:34 AM   #18
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I have the "F1" chromo ebay flywheel (10 lbs), works great. Like Failure said, I too would go lighter if I could. It's no night and day difference, even at 10 lbs. Wouldn't waste my time lightening the stock flywheel for the minimal weight savings.

-Ryan
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Old 07-01-2014, 01:18 PM   #19
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The extra mass probably helps when the a/c cycles.
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Old 07-02-2014, 10:32 AM   #20
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So, who has MS1/2 control and still runs AC and then used a lightweight flywheel? This is not a track only car and I need my AC in the South!

I probably would still go for the shaved flywheel. I am in the middle of adding sequential injection, sequential COP and AC input to the MS so I can bump idle up when AC kicks on. If I can get he idle cycling stable with AC on, I might go back to a full light FW.
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