i have a jdm b16a w/ a lot of bolt ons and a 35/50 shot nitrous. Also have a lightweight battery (hawker g16ep), if that matters at all. I plan on autoXing and eventually lapping at the track. This is my heavily driven daily driver in North Jersey where traffic is a given.

I am going to get a Exedy organic racing clutch and Quaife LSD. I don't want any comments on those.

All I want to know is if there will be a big improvement in performance (acceleration, heel-toeing, downshiftingm etc) with the exedy chromoly flywheel weighing between 9.1 and 9.4lbs over stock. I've read about chromoly vs aluminum and lighter not always being better, especially for drivability. I'm just wondering if i should just get the 7.5lb fidanza to really notice an improvement. I just don't want to get the Exedy flywheel and not be happy/notice the gains and wish i had an even lighter one. someone tell me that won't happen, lol.

thanks.

I'm looking for people with personal experience with a ~9lb flywheel compared to a ~7.5lb piece.

price isn't my concern. quality & performance are. Thats why i'm leaning toward the Exedy flywheel. Its contruction and quality is excellent, someone just tell me getting a 9.1lb flywheel will be a nice noticable difference over stock flywheel.

 

AL FW =

stay with the chromoly unit... trust me

 

You could use a 9 oz flywheel and you'd notice a huge difference. The point is that it's a compromise. There have been some pretty good articles discussing flywheels in the Tech forum and in this one (search "lightened flywheel" and stuff like that).

In terms of outright acceleration, the concensus from the people who know more than those who don't , is that the flywheel is not as massive relative to the drivetrain as people want to people. Thus acceleration is definitely helped, but it won't make you a drag race superstar. When the clutch is engaged, there is a lot of heavy rotating such that the flywheel makes up smallish fraction of the total inertia.

The difference you'll see is when the clutch is not engaged (disconnects a lot of heavy ****) and the flywheel's relative inertia becomes substantial. The engine revs (accelerates whatever) much faster. This is a good reason to buy a flywheel. Rev matching, heel and toeing, etc. can all happen quicker. This is important for an autocross.

You won't notice a difference in acceleration between the 9lb and 7lb, but both should be a bit quicker than a stock wheel. The engine should rev significantly faster with 9lb and even more so with the 7lb (clutch engaged).

There's more to a flywheel than that. Read the articles to see why too light will wear and/or break your ****.

 

where the mass is located is the most important thing, not the total poundage value

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18CXr &raquo;</TD></TR><TR><TD CLASS="quote">where the mass is located is the most important thing, not the total poundage value</TD></TR></TABLE>

Things to look for in a FW

1- Mass hub centered
2- Chromoly construction (1 piece)
3- Beveled teeth help starter engagement

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18CXr &raquo;</TD></TR><TR><TD CLASS="quote">where the mass is located is the most important thing, not the total poundage value</TD></TR></TABLE>

yeah, definitely true. I've read sooo many threads and articles about lightweight flywheels, chromoly vs aluminum, etc., and didn't find anything about where most of Exedy's flywheel's weight is concentrated. I'm assuming that through their awesome product development it performs almost the same as the exedy (meaning it's extra weight is more centrally located), even though its total weight is a bit more. I'm definitely going to get the Exedy flywheel. it has a lot of R&D put into its design, like its exhanced air flow to cool the clutch better. Also, The ring gear teeth are milled onto the flywheel unlike on AL flywheels where the ring gear is pressed on.

thanks for the replies.

 

I'm running the exedy clutch & flywheel combo in my gsr and I absolutely LOVE it. The car became a completely different animal once the two were installed. I highly recommend them.

 

awesome, thanks for the positive responces.

anyone else have experience w/ the exedy flywheel, or any ~9lb flywheel over stock?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18CXr &raquo;</TD></TR><TR><TD CLASS="quote">where the mass is located is the most important thing, not the total poundage value</TD></TR></TABLE>

True, but that's not my point. The flywheel's (whether the 9lb or 7lb) inertia is small compared to the axles, wheels, gears, and everything else the engine must spin. It's definitely not insigificant, but not huge. Here's a decent thread: https://honda-tech.com/zerothread?id=781933, and another about flywheel vibration damping (which is what i was talking about when going too light): https://honda-tech.com/zerothread?id=170541.

Also, the FW is supposed to do more than grip the clutch plate and look pretty. It also needs to absorb harmonic vibration present from the indiv. piston firings. There are some good threads on this from people who are "in the buisness".




Modified by GSpeedR at 10:35 PM 3/10/2004

 

Blah--it's a great combo (exedy clutch/9 lb. fly, that is). Trust me, you'll notice the difference between the 9 lb fly and the stocker--no doubt.

It's a stout, reliable combo that performs nicely.

 

good info. thanks again.