My clutchplate is starting to slip when I accelerate, so it's about time for a new one, while I'm in there, I was thinking about installing a lightened flywheel. Now someone told me that if I install one I'm going to lose torque...? So my question is now what is the best way to go? Anyone have any suggestions? My engine is stock except for an pettit intake, emptied precat and hks catback, still on stock cat.

 

do you drive your car on a daily basis? cuz if you do, you might want to double think spending 400 dollars on a lightenned flywheel

 

cmartinp28 why is that? explan after you make a statement like that

 

yep, it's my daily driver. Is it too difficult for daily driving or just not worth the money?

 

hmm, just read this thread about the stock clutch... Only 300 bhp? Maybe I'd be better of upgrading the clutch then... Since I'm planning a pfc install...?

 

https://www.rx7club.com/race-car-tech-103/lighter-flywheel-power%40high-vs-torque%40low-237183/

 

Go with the ACT street/strip clutch (part # HD-00) and a lightened aluminum flywheel. I daily drove this setup for over 3 years and *loved* it. No disadvantages whatsoever, except if you plan on launching at the drag strip often. Otherwise, the setup is worlds better than stock.

 

what about the different flywheels anyone have a prefference?

 

thanks for the link mahjik, great info!!!

An aluminium? I was thinking about going with the pettit alu flywheel(8.5lb) or the 9.5lb steel one, which would be best? Or do you have a better suggestion on brand of flywheel? I'm going to go with the clutch assembly you suggested.

 

i prefer the light steel one for mostly street use. but it really depends on why you want to lighten it. the aluminum one revs fast, but it also de-revs fast.

 

I'm w/ Harrison on this. I drive my FD a lot, and I personally think a lightened flywheel is a considerable hassle, and would be even more so if I daily drove her. Maybe some of you guys (like Rich) were using one of the heavier lightened flywheels? I absolutely HATE getting caught on hills and rises, as it sucks trying to get her going. If the hill is inclined enough, you're either gonna be clutching and reclutching to get her going (2 or 3 times), or straight up riding your clutch (which I don't like to do). Plus, overall it's just not very docile. Not exactly a street mod IMO. I do love it b/c I hardly drive my FD, but when I do, I beat the crap outta her, and the low end response is AMAZING w/ the flywheel. Plus, she FLIES through the revs like crazy!

 

For those of you w/ a lightened flywheel, do you have any noise or vibration issues especially upon deceleration or engine braking?

(See warning disclaimer: http://www.flyinmiata.com/index.php?...umber=08-26000)

I had one in a previous car and the noise drove me crazy!

 

the advantage to the light steel one is not so much the overall weight reduction, but the weight is moved to the center of the disc instead of being on the outer edges.

think of it like a merry go round. when your on the outside gravity pulls you alot, but if u sit in the middle, theres not much g forces.

so the point is taht u can have a fly wheel that spools faster and yet offers good driveability.

i have not noticed any extra noise when i changed the flywheel, but i dont have the aluminnum one.

 

So if I read correct, The best way to go would be a medium lightened flywheel?
Like a 12.5 lb rather than a 9.5 lb? both steel btw...

 

No, the best way to go is with whatever setup you prefer.

With that said, I use a 9.5lb ACT prolite flywheel. I absolutely LOVE the setup, and after running it, I would never go with anything heavier. It gives the car a much more responsive feel. I do mainly street driving with a fair share of autocrossing and HPDE. Very few drag events.

-Rob

 

no problems with accelerating from a standstill? cuz everyone tells me that the car will suck at accelerating from a standstill...

 

Don't believe what everyone says... Read the link I provided earlier in this thread.

 

Its going to accel. faster its just it will be harder for the initial engagement of the clutch off the line, because the engine is going to stall easier due to less rotating mass. But if you get that figured out the car is going to be faster.

 

thanks, that's about what I wanted to hear...!

 

I couldnt agree more, I've driven several high-output cars (03' Cobra with mods, 02' Z06, etc) and the cluth combo was amazing with a 9lb flywheel. 9lb is a little much for daily to most but it was smooth and firm with amazing revability. You dont loose torque, it is merely perception as the rotating mass is lower so the inertia of the motor is lower. This is good for reving but can be a bear in traffic sometimes if you arent a quick shifter or dont rev match well -- it also makes launching at the track a bit differant but in my opinion the gains are well worth it.

~Kris

 

Gil, I don't have any noise or vibration issues...just that it's hard as HELL to launch properly, and it's HORRIBLE on inclines

Absolutely. Well said. Rynberg posted a report by Max Cooper from a while back w/ testing results from a regular to lightened flywheel.

From back in '03 (https://www.rx7club.com/showthread.p...7&page=2&pp=15)

50hp TO THE WHEELS in 1st, and 16 in 2nd!!! That's 99.99% of the reason why my FD pulls so damn hard w/ a dead tired motor w/ 89K original miles, 9 inHg vacuum, and dying stock turbos

 

I have a 12.5lb unit and it pretty much the same as stock. I see no negative aspects at all sounds like 3.5lbs is a big change.

I would think that this is one of those upgrades that reduces powertrain loss.