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Lightweight flywheel discussion - lose torque?

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Old Mar 15, 2004 | 06:52 PM
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Default question on light flywheel???

ive been hearing alot on light flywheels about loosing torque and not loosing torque. my freind says that u loose torque was wondering if this is true and if so how much would it realy matter?
thanks in advance and sorry for the stupid question i searched but found nothing
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Old Mar 15, 2004 | 07:14 PM
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Default Re: question on light flywheel??? (capcon83)

You do not loose torque. the motor is still the same.
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Old Mar 15, 2004 | 07:40 PM
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Default Re: question on light flywheel??? (Bbasso)

It will not force the motor to loose or gain anything.

In fact, the lighter the flywheel, the more it will *feel* like there is more torque...you will accelerate faster because of the less rotational mass.
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Old Mar 15, 2004 | 07:45 PM
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Default Re: question on light flywheel??? (capcon83)

it will only improve everything, although to me its not worth messing with unless you're replacing the clutch
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Old Mar 15, 2004 | 08:26 PM
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Default Re: question on light flywheel??? (vtec.dc2)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vtec.dc2 &raquo;</TD></TR><TR><TD CLASS="quote">it will only improve everything, although to me its not worth messing with unless you're replacing the clutch</TD></TR></TABLE>
yea im going to need a new clutch sometime soon and was looking at what i can do was thinking of toda high power clutch kit or act ss cluch hd pressure plate and a exedy lightweight flywheel to be cheap
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Old Mar 15, 2004 | 08:29 PM
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Default Re: question on light flywheel??? (capcon83)

some good info can be found here.

https://honda-tech.com/zerothread?id=769258
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Old Mar 15, 2004 | 08:32 PM
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Default Re: question on light flywheel??? (capcon83)

what kinda clutch/flywheel/Pressure plate should i get hears my mods
car
**2001 ITR
motor
**B18C5 (for the people that always ask dont know why but whatever)
modifications.
**Hytech header
**Hytech exhuast (with cat and resonator that came from hytech)
**Spoon Cams & Camgears. valve clearence set at (IN 0.18mm) (EX 0.20mm) thanks to Alan at A&J Racing Motorsports
**AEM cold air intake
**Apexi V-AFC controller
**FPR (wasnt touched)
to view a larger pic add a " .orig.jpg " at the end of the adress when you copy and past it to a browser

copy the shortcut on the bottom link and paste it into a internet browser to view a bigger picture
Bigger Picture Of The DYNO
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Old Mar 15, 2004 | 08:37 PM
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Default Re: question on light flywheel??? (capcon83)

do you drag/track/daily drive or all of the above?
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Old Mar 15, 2004 | 08:47 PM
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Default Re: question on light flywheel??? (capcon83)

Like I said before "You do not loose torque. the motor is still the same."
Your engine will spin quicker up and down the RPM range-

I went with the Comptech Al FW and would never go heavy again, and I'm 99.9% stock.

Go light and don't turn back.
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Old Mar 15, 2004 | 11:51 PM
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Default Re: question on light flywheel??? (DsR)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DsR &raquo;</TD></TR><TR><TD CLASS="quote">do you drag/track/daily drive or all of the above?</TD></TR></TABLE>
im street driver and some days a drag not 100% racing it but sometimes i do a lot and sometimes not that much mostly drag not that much track
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Old Mar 15, 2004 | 11:51 PM
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Default Re: question on light flywheel??? (capcon83)

I have a Spoon clutch / Toda flywheel. Good enough for the power I put down with my B cams.
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Old Mar 16, 2004 | 03:46 AM
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Default Re: question on light flywheel??? (Bbasso)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bbasso &raquo;</TD></TR><TR><TD CLASS="quote">Like I said before "You do not loose torque. the motor is still the same."
Your engine will spin quicker up and down the RPM range-
</TD></TR></TABLE>
What about inertia? Could that be considered 'initial torque' or something to that effect? A heavy flywheel should have a lot more stored energy when you let the clutch out vs. a light one.

Either way, I dont think it matters. I'm stock(except flywheel and clutch) and find it hard to take off with my ACT clutch without spinning the wheels a little. I dont think I need more torque in the 1,000-2,000rpm range...


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bbasso &raquo;</TD></TR><TR><TD CLASS="quote">
I went with the Comptech Al FW and would never go heavy again, and I'm 99.9% stock.
Go light and don't turn back.</TD></TR></TABLE>
I have the 6.7lb comptech as well, and would never go back. If they made one lighter, I would go with it.


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Old Mar 16, 2004 | 03:54 AM
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Default Re: question on light flywheel??? (capcon83)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by capcon83 &raquo;</TD></TR><TR><TD CLASS="quote">ive been hearing alot on light flywheels about loosing torque and not loosing torque. my freind says that u loose torque was wondering if this is true and if so how much would it realy matter?
thanks in advance and sorry for the stupid question i searched but found nothing</TD></TR></TABLE>

u will not lose tq for sure cuz it has nothing to do with motor. but basically you REV faster with lighter flywheel but also drops faster when u shift, for me , lightest are not always the best so all your choice
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Old Mar 16, 2004 | 04:01 AM
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Default Re: question on light flywheel??? (YelLowITR)

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

u will not lose tq for sure cuz it has nothing to do with motor. but basically you REV faster with lighter flywheel but also drops faster when u shift, for me , lightest are not always the best so all your choice </TD></TR></TABLE>

i'm sorry. edumacate me... when are lightest flywheels not always the best?

I must have missed the memo from billgates stating such.
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Old Mar 16, 2004 | 10:07 PM
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Default Re: question on light flywheel??? (capcon83)

if there two identical type r's and only different is the flywheel, if one with comptech 6.75lb flywheel and one with stock 15lb and race from 1k rpm and on, is one going to be faster than the other and if so by how much?
just wondering
thanks in advance
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Old Mar 16, 2004 | 10:44 PM
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Default Re: question on light flywheel??? (Soup ****)

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

i'm sorry. edumacate me... when are lightest flywheels not always the best?

I must have missed the memo from billgates stating such.</TD></TR></TABLE>

With drag racing, sometimes it is better to have a heavier flywheel, it's easier to launch.
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Old Mar 16, 2004 | 10:45 PM
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Default Re: question on light flywheel??? (capcon83)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by capcon83 &raquo;</TD></TR><TR><TD CLASS="quote">if there two identical type r's and only different is the flywheel, if one with comptech 6.75lb flywheel and one with stock 15lb and race from 1k rpm and on, is one going to be faster than the other and if so by how much?
just wondering
thanks in advance</TD></TR></TABLE>

I don't think it will be a noticible difference, personally.
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Old Mar 16, 2004 | 11:17 PM
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Default Re: question on light flywheel??? (jond)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jond &raquo;</TD></TR><TR><TD CLASS="quote">I have the 6.7lb comptech as well, and would never go back.

If they made one lighter, I would go with it. </TD></TR></TABLE>

Exactly, the lighter the better. I'am completly happy with my 7lb Clutchmasters peice.

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Old Mar 16, 2004 | 11:28 PM
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Default Re: question on light flywheel??? (capcon83)

Interesting question.

In the low speed I can't see too much of a difference except for shifting times, But as the car gains more speed and has to go through the rpm lets say 4th or 5th gear there will be less stress for the motor to turn while inching each rpm.

The way I think or the way I see it, A lighter FW will help over all.
As to say how much time in a quarter mile..... small amounts but in a long speed run or a track event where the car is always in the upper range of the motor I would tent to think that it might have a slight advantage.
Now I can't prove any of this but with common mechanical knowledge and basic thinking I would have to stand behind this. Also if you took a stick and put a 20lb weight on the end vs the same stick with a 5 lb weight I thinks its easier to keep the 5lb spinning then the 20lb... could this be common sense?Or just the happy smoke kicking in?
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Old Mar 17, 2004 | 07:27 AM
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Default Re: question on light flywheel??? (capcon83)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by capcon83 &raquo;</TD></TR><TR><TD CLASS="quote">if there two identical type r's and only different is the flywheel, if one with comptech 6.75lb flywheel and one with stock 15lb and race from 1k rpm and on, is one going to be faster than the other and if so by how much?
just wondering
thanks in advance</TD></TR></TABLE>

The one with the lighter flywheel will definitely be faster - assuming everything else is equal. There was a good article about lightweight flywheels in Grassroots Motorsports a while back. They don't have the article online though.

This is the exact same concept as putting lightweight wheels on your car. Less rotational mass is a good thing.
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Old Mar 17, 2004 | 08:44 AM
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Default Re: question on light flywheel??? (JeffS)

thanks for the replys
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Old Mar 17, 2004 | 09:00 AM
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Default Re: question on light flywheel??? (capcon83)

lighter flywheel

revs up faster
less weight
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Old Mar 17, 2004 | 09:04 AM
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Default Re: question on light flywheel??? (BolivianDc2)

should i get a lighter flywheel if i mostly drag race a 1/4 mile?
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Old Mar 17, 2004 | 09:11 AM
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Default Re: question on light flywheel??? (BolivianDc2)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BolivianDc2 &raquo;</TD></TR><TR><TD CLASS="quote">revs up faster</TD></TR></TABLE>

This is the phrase that about 95% of people on this site use to describe why a lightweight flywheel is good. WTF are you trying to say???

A) The car accelerates faster
B) The engine revs faster with the clutch depressed?

It sounds like you, and everyone else, are trying to say B. If so... who cares?
Yes, I know about rev-matching - but from where I'm sitting, "revs faster" is a meaningless descriptor.

Jeff - who has lightweight flywheels on his cars - and for a reason better than that they "rev faster".
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Old Mar 17, 2004 | 09:15 AM
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Default Re: question on light flywheel??? (SoCal ITR)

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

I don't think it will be a noticible difference, personally.</TD></TR></TABLE>

than you have some reading to do.

do you think you wont notice the removal of rotational mass ?

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