kwescott

Here's one taken from Ebay

Agent008

I have to say, I think your numbers are wrong.

You are suggesting that the ACT Prolite is heaver then the RB???

From RB: "reduces the flywheel weight about 29 percent...reduces the flywheel inertia approximately 55 percent."

From RX7Store.net re: ACT Prolite: "reduces the flywheel weight up to 55 percent of the original, and reduces the flywheel inertia up to 80 percent"

Also I think you have a typo on the ACT streetlite. It's not 13.3 lbs total !!!!

Lastly, you might want to add the inertia numbers for the flywheels that have published numbers.

speeddemon32

couple problems with all of that.

yes the prolite with counter weight is more then the racing beat with counter weight. I even called ACT to verify. but you have to consider the location of the weight. look at the ACT wheel it is all in the center, the outer edge has been cleaned up the most.
if you look at the RB wheel, you can see that they did NOT take all the weight off of the outer edge, they just made it lighter.
so yes it does weight more, but i belive it is still a better wheel.


also SOME of those inertia numbers are all genaric and say "up to x%"


my miss coalculation has been fixed... thanks.

FastRX8

Any guesstimate on when we'll get the flywheels and pulleys?
I want to get my car flashed to the latest flash at Mazda, then I'll take it to the dyno before and after the install.

- Cesar -

speeddemon32

might want to get that car flashed soon. from what i gather it wont be TOOOO long before they come in. (flywheels are already in, just waiting for counter weights.)

pulleys are today i belive????

Ajax

I actually have the ACT Street lite flywheel installed on my car.
The flywheel itself is 13.5lbs. It's identical to the pro-lite w/o the outside ring sections milled out.

Yes, it is heavier than stock but all of the weight is concentrated around the center. It does rev faster than stock. It revs smoother than stock and is 10x more consistent than stock.

If I had to do it all again, I'd probably go lighter since this is so easy to drive with, but even so, the car revs up noticeably faster than the stock car and has a definite increase in throttle response in every single gear.

EDIT: Just FYI, moment of inertia is everything in this case. You want that moment to be as low as possible for fastest revving. I really wish they'd advertise the moment of inertias of flywheels.

speeddemon32

yeah I understand that, I was just a little suprised when I saw a "lite" flywheel that has a total weight MORE then stock. just sounds funny!

"worse" was a bad choice in words. I should have used "more" as that would be more correct. not worse.

speeddemon32

I gatta say guys, I drove my car about 3 more miles today. I think I like it! I love the fact that the hesatation or "bogging" is gone now when you shift.

I live very close to work, I dont get to put a lot of miles on it, so I will know more once i accually get out of the residential area

Ajax

You can see the difference in your own pictures as to why a heavier flywheel would perform better than a lighter. Look at the back of the stock flywheel. That ring around the outside is the counterweight. It's also the biggest slowdown that flywheel has.
Now put all that weight at the center and you get an amazing difference in inertia.

speeddemon32

yeah i know. I see that now that I got the stocker out, and replaced it with the prolite.... i belive i even stated this in one of my post.

thatrs what i ment when I said "worse" was a bad choise of words, because it is not worse. "more" is a better choice of words as this is true. "more" but still "better"

staticlag

Damn, you guys are really making me wish my flywheel was here Damn ebay, hurry up!

gh0st

maybe i didnt come across clear enouph.

i LOVE the flywheel. just not for the reasons that people used to rave about them for. i think this thread really cleared up the true benefits of a lighter flywheel. abidd and a few other say they zip through the gears faster and in theory they should. but the difference is no where near as dramatic as when the car is reved in neutral. like i said, 1st and 2nd gear improved quite a bit in terms of throtte response. the motor can go from decel to acel in a shorter amount of time. this benefit started to dwindle as you moved up in the gears. 3rd was a tid bit better then stock IMO.

its a gereat mod if you can appreciate it but i felt there was a lot of hype surrounding it. from what ive seen, even with the prolite (one of the more agressive options available), your not gonna make your 8 a whole lot faster in a drag race. maybe a tiny bit at best.

now for auto x and road racing, the improved throttle response, less bog and quicker throttle blips is where i think something liek this really shines.

Ajax

I'm in the process of making a driving video to show exactly what you're talking about. And you're right, it's not nearly as pronounced as when in neutral. The one thing neutral does for you though is make heel and toe or just downshifts in general a lot easier.

Even during driving, it's still very pronounced once you're above 6k. My car pulls MUCH harder up there than it did stock and shifting is flat out perfect. Then again, I have a performance clutch too so that might help a bit.

kwescott

The comment that was made about the revs above 6K is excactly right. Once we get some videos up of the stock and lightened flywheels, you will see this change. It is dramatic in my view. The stock flywheel loses steam as it climbs, it just seems to climb slowly. The ACT flywheel definately is impressive above 6K.

Lets get those videos up Speed. Get Cesar to host them. Nemisis8 may also host. He has a lot of RX8 vids up on his site and is always looking for more. Send him a pm.

FastRX8

For hosting videos, use
Youtube.com
Max file size: 100 MB. Max length: 10 minutes

- Cesar -

Ajax

I'll see if I can get mine done tonight. i really need to get a camera mount for my car.

kwescott

Once we start getting some more video's maybe we can place the link next to the flywheels in the first post. I think the only one we have is from Abbid, for the Fidenza flywheel.

speeddemon32

no problem, I will post links next to the flywheels of vids. I will try and post my vids tonight.


oh and just to continue the prolite post I had...... yeah I think i like it more and more... i really need to get into your car keith so I can "go back" to a stock flywheel. but i sear i am blowing through 1st and 2nd much much faster..... i hope it is not just my imagination.

california style

so any updates on feedback etc?

I really want more info and opinions.....

speeddemon32

I added a video of the flywheel under the ACT Prolite. hope you like it.

I know we could have done a better job, but not to bad. I am just glad we remembered to do any video. I was so excited to put the flywheel in, I almost didnt take the 2 seconds to do a before.

gh0st

the pullies made more of a difference then i thought they would. sweet

Brettus

iTrader: (2)

sweeet - can see how this would be great on downshifts at the track .
Great job SD 32

teen_living_a_dream

you don't have pettit

8.5 aluminum - $500

9.5 steel - $310

counterweight sold seperately - $80

counterweight weight is not stated

all info from pettit racing

Trigg

ive heard you can expect .3 or .4 in the 1/4 mile from a LW flywheel. this would put us right there with a 350z. if this is true i think it is well worth it.

gh0st

there are people that have gone FI and didnt see that much gain.