I've searched the forum and didn't readily find anything that directly answered my question. I'm getting turbo soon and want to lighten my flywheel. I found a shop that will lighten mine for me, but I don't want to go too light because this isn't a full-throttle racer. My question is -- how much does my OEM flywheel weigh for my setup (see signature) and what is a good midweight? I don't want an aluminum flywheel, so please don't say "You should just get an aluminum one", I don't take it to the track I just want quicker revving and turbo spool.

 

If your gonna lighten a stock flywheel, I would only lighten it a few pounds. I feel if you lighten it anymore, your risking something. By the way, lightweight flywheels are not that much are more, they go for about $100 bucks, give or take some.

 

Yeah, I really only want to take a little off. It depends on how much the OEM weights. If it weight 18lbs I really only might take it down to 12 or so, as an example. I don't want the RPMs to go down too fast... still want some inertia to keep it from winding down way fast.

I'm getting it done through a friend of a friend who owns a machine shop so I'm getting a decent deal. Way less than $100.

EDIT: He's going to balance it out and everything.

 

running a 8lb flywheel on a allmotor setup for 3 years not 1 problem with it.

will be using the same fidanza flywheel when the b16 enters the boosted world

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Slipjack &raquo;</TD></TR><TR><TD CLASS="quote">Yeah, I really only want to take a little off. It depends on how much the OEM weights. If it weight 18lbs I really only might take it down to 12 or so, as an example. I don't want the RPMs to go down too fast... still want some inertia to keep it from winding down way fast.

I'm getting it done through a friend of a friend who owns a machine shop so I'm getting a decent deal. Way less than $100.

EDIT: He's going to balance it out and everything.</TD></TR></TABLE>

If you're going to lighten it, it has to be balanced no matter what. A good weight to take the stock wheel down to is 12-13lb range.

 

OEM FLYWHEEL OFF A Z6 WEIGHS 17-17.5 LBS. ... just took mine off and weighed it the other day... picked a lightened flywheel up off ebay for $140 (weighs 10lbs)

EDIT: didn't want to go that light as well but... i have not heard any real problems with it...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hondainspired &raquo;</TD></TR><TR><TD CLASS="quote">i have not heard any real problems with it... </TD></TR></TABLE>

Well allow me to clue you in...

Lightening a stock flywheel is beyond dangerous, it approaches stupid. Do yourself a favor and make the investment in an aluminum one. You'll never regret buying the right stuff.

This is not mine, don't ask me anything about it, it's a B series from a shop, it was posted on honda-tech, it was stock flywheel that was lightened an unknown amount.

 

I think mine weighed in at like 16.7 pounds stock. We lightened it down to 12.2, but i wasn't able to notice a difference because I had to throw in a vx tranny, because I lost my 1st gear in my si tranny.

 

.wow..

what part came loose? i dont know much, but it looks like the teeth ripped off the flywheel. can anybody else tell how that happened?

is the only downside to an aluminum flywheel the tiny rotational intertia?

 

OML .... those pictures are scary... but i didn't buy a lightened stock flywheel....

 

i have a 8 pound fly in my teg rpms dont drop as fast as alot of people say its pretty nice wish i wouldve done it sooner

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sik96teg &raquo;</TD></TR><TR><TD CLASS="quote">i have a 8 pound fly in my teg rpms dont drop as fast as alot of people say its pretty nice wish i wouldve done it sooner</TD></TR></TABLE>

yeah i'd say no matter what you're doing get the lightest one you can afford. light flywheels are nothing but great. i don't know how all that BS about "rpms drop too fast between shifts blah blha" got started but it's not true at all. the only downside is that you'll be a little slower going up hills, but the car ******* rips downhill

i bought an 8lb and it's too heavy. if i ever get the money i'm going with the 5lb tilton

when i get a daily driver, this will be the only mod. it really wakes the car up and makes it much more fun to drive. i love revmatching now.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by The Internet Tough Guy &raquo;</TD></TR><TR><TD CLASS="quote">

yeah i'd say no matter what you're doing get the lightest one you can afford. light flywheels are nothing but great. i don't know how all that BS about "rpms drop too fast between shifts blah blha" got started but it's not true at all. the only downside is that you'll be a little slower going up hills, but the car ******* rips downhill

i bought an 8lb and it's too heavy. if i ever get the money i'm going with the 5lb tilton

when i get a daily driver, this will be the only mod. it really wakes the car up and makes it much more fun to drive. i love revmatching now.</TD></TR></TABLE>

couldnt have said it better one of the best mods ive done

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by The Internet Tough Guy &raquo;</TD></TR><TR><TD CLASS="quote">you'll be a little slower going up hills</TD></TR></TABLE>

Please explain that. If you're referring to the "ligher flywheel means less torque" position, I'll be disappointed.

 

i can't really explain it (i got a D- in physics) but that's the way it works

it has something to do with less momentum and inertia and all that crap i don't care about. but no, a light flywheel means more torque. the less **** you have flying around the better.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by The Internet Tough Guy &raquo;</TD></TR><TR><TD CLASS="quote">but that's the way it works</TD></TR></TABLE>

I hate to be the bearer of bad news, but that's not really how it works... If you are losing speed while going up a hill, just press the gas more. Less rotating mass is less rotating mass, and any reduction reduces your moment of inertia and allows faster acceleration in any given situation, no matter what external conditions are experienced.

 

well damn i knew he was wrong about the up hill thing but i wasnt going to call him out

 

aww man i didnt notice your from N.C. i use to stay in jacksonville

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by drdisco69 &raquo;</TD></TR><TR><TD CLASS="quote">I hate to be the bearer of bad news, but that's not really how it works...</TD></TR></TABLE>

well that would actually be good news because my car is slow as **** up hill but being that it's just a stock d16 with only a flywheel and no power steering is probably why. but it definately got slower up hill after the flywheel. much faster downhill though.

i wish i could explain it or find someone who has, because i know i've read it a few times before. i'm pretty sure that is right. ever play GT4? it says so that a light flywheel will slow you down up hill.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by The Internet Tough Guy &raquo;</TD></TR><TR><TD CLASS="quote">ever play GT4? it says so that a light flywheel will slow you down up hill. </TD></TR></TABLE>

Ah, and we all know how accurate the information in video games is... Forget mechanical engineering, I should drop out of here and get a PS2!!! Then I can pay $6000 for a port and polish that gets me 5 hp or whatever they do in the new GT4. I have an Xbox..

But really, a lighter flywheel will always net greater acceleration. Its lower mass will make the engine more sensitive to any variance in torque, as there is less mass to "absorb" it, in a manner of speaking. Lighter is better, until it starts compromising other factors, such as harmonic damping and materials strength and safety.

 

Lemme go ahead and tell you..... a really light flywheel with a FWD turbo honda = no traction. This is from my experience with my old 94 GSR boosted.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Accel Junky &raquo;</TD></TR><TR><TD CLASS="quote">Lemme go ahead and tell you..... a really light flywheel with a FWD turbo honda = no traction. This is from my experience with my old 94 GSR boosted.</TD></TR></TABLE>

Well dumping your clutch will do that. Traction all depends on tires. You prolly had a problem with burning out from a stand still.

Oh and all the people that are lightening there stock flywheel; DONT DO IT!! Please for your own sake. Just get a aftermarket flywheel. I would suggest getting a steel flywheel. I got mine from Pro Street and its 8.36lb. of steel. I still don't like aluminum flywheel as I don't think they are as strong. Steel still has strength, reliability, and saftey. The picture above of that exploded flywheel is clearly a stock machined down. They are not ment to be machined down at all other than for a resurface and that even is very little. Aftermarket light flywheels are made of a stronger steel and can handle it just fine .

 

Traction doesnt just depend on tires. WIth the lighter flywheel, your engine is going to rev much faster in 1st gear and thus the turbo will spool much fast, and thus you will have more wheel spin probs.

 

Traction doesnt just depend on tires.

your right it also has to do with suspension and how you engage your gears, dumping your clutch threw every gear gives no traction

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fasthatchb18c1 &raquo;</TD></TR><TR><TD CLASS="quote">Traction doesnt just depend on tires.

your right it also has to do with suspension and how you engage your gears, dumping your clutch threw every gear gives no traction</TD></TR></TABLE>

This is true. I think it mostly depends on the driver and how they drive. I am sure you can make it not spin by just taking it easy.