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Lightweight flywheels For NA: Pros and Cons
I have the NA's motor out and I'm starting to put the replacement together and I think this is the best time to upgrade the flywheel...I'm looking to get input from those with lightweight flywheels and how light I should go.
The NA will not be daily driven but it will see some mild traffic once in a while. |
Sub for info.
I had one of Fidanza's 7.5 lb flywheels on my old turbo Protege (with an Exedy clutch) and I hardly noticed a difference. I had to give it a little more throttle to get it going and shift a tad faster but it wasn't anything inconvenient. I daily drove the thing too. I don't have any experience with them in a rotary though. |
I installed the Racing Beat lightweight steel flywheel on my 12a this spring. Feels okay, but I should've gone lighter. If I had it to do again, I'd take a look at the Fidanza Infernosg mentioned. :)
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i've heard all sorts of stories from one extreme to the other, but my experiences have not uncovered any drivability issues. on my MR2 Turbo, i never found myself having to slip the clutch any more than with the stock. on my Rx-7, i never detected any need to slip it more either. the only difference i detected there was engine deceleration between shifts, but it was only slight. admittedly, it could have been my mind's expectations manifesting itself.
i must add though, that i lived in Florida, so it's pretty flat. i see you live in the Bay, i've been San Francisco (spent a few hours in Oakland, too) and i know it's hilly, so that may affect your experience if you decide to do it. however, as long as you can adjust yourself easily, it shouldn't be a problem even then. Quote:
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Keep in mind that if you go lightweight FW, you will lose torque.
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It's a rotary what torque
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Anyway, I went from a stock flywheel to the Fidanza, I picked up 0.2 seconds in the 1/4 mile. (13.4 to 13.2) with a completely stock RX7. I didn't notice that the launch was that difficult with a stock-type clutch in the car. I now have a RB 12 lb turbo flywheel in the car with a spec stage 3+ clutch and it is a bit challenging to get it moving without a smoky burnout, but I don't blame the flywheel. Your idle may not be as smooth. |
yeah, the reading I've done says that they're not ideal for drag-racing so I am not too concerned about that.
How much does the Fidanza Aluminum flywheel weigh? http://www.good-win-racing.com/Mazda...R-1003RX7.html I found that one but there is no info on the weight... DO you have any good places where I can pick them up at a good price? |
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I found an Exedy unit for less than the Fidanza too....But I can't find the weight even on the Exedy site.
I'm still doing some searching so I hope to find the info soon. Question: can I use a TII lightweight flywheel with the NA counterbalance? |
as long as the rear counterweight is correct for your rotors and front weight, then i think you can use virtually any aftermarket flywheel that will bolt to it.
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Yup, you match the counterweight to the engine, and the flywheel to the trans.....
I had the lightest offering from SR motorsports, something like 9.5lbs, I had to rev slightly higher to get going in 1st, took a few minutes to get used to but nothing to bad. Reved faster, quicker shifting, but yeah the idle was messed up a bit. All in all I'd do it again without hesitation. |
I use the Exedy lightweight chromoly flywheel, not too sure of the weight. The car does rev faster & has quicker shifts. Never noticed the idle because mine was off anyways
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What happens to the idle? I never noticed anything on my other car so I guess this is something unique to the rotary? Are we talking "car will randomly stall" idle effect or something like "idle is more erratic"? I suppose nothing bumping up the idle 100 RPM or so wouldn't fix?
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