light weight fly wheel or just rigid?

[diverse]

I seem to be a little confused on the flywheel question.

I was under the impression the car had a lighter flywheel.

but the literature says it is just a rigid flywheel

so in any event the flywheel is different then the stock flywheels for the 330i

So my question is why would they go through the effort of making a rigid flywheel and not reducing the weight. I am sure the engineers know that reducing the weight on a fly wheel is cheap torque. gain.

I have an automatic and I am interested in going with a lighter flywheel
but not if the one in the car is already somewhat light

I was thinking about calling BMW and asking what the shipping weight is for the performance package flywheel.
vs the regular one.

[wsmeyer]

I'd never heard that ZHP's have different flywheels, manual or auto. Only one part number for each listed for all E46's too:

Manual:
http://www.realoem.com/bmw/showparts...07&hg=11&fg=20

Auto:
http://www.realoem.com/bmw/showparts...78&hg=11&fg=20

[ZHPRegistry.net]

E46s use different flywheels for manual vs auto. Manuals are dual mass vs solid for automatic. This has nothing to do with it being a ZHP. Dual mass flywheels are built to smooth out engagement of the clutch when a "human" is involved. This problem does not exist with autos. In fact the flywheel on autos is extremely light.

Spend your money elsewhere.

[diverse]

Thanks I will scratch this off of my radar.

[Avetiso]

Flywheel is an awesome upgrade, if you can get one that doesn't chatter.

[diverse]

just 3500 rpm, for more power on demand. The tach
boasts an increased redline that starts at 6800 rpm (300
higher than the 330i). Along with the higher-revving
engine, they installed a more rigid flywheel to withstand
the higher output. As an added bonus for weekend racers,
the speed governor was raised to 155 mph (up from 128).
No wonder the needles on both dials are now red – as if
glow

this was the excerpt from bmw magazine that advertised the zhp

so they said it was extra rigid to withstand the revs.

but like was said earlier this may have more to do with manual transmissions and not automatics

[terraphantm]

The flywheel changed when the 330 switched from 5-speed to 6-speed, but I don't think there's one that's exclusive to the ZHP. I have read that the 6-speed flywheel is lighter than other BMW flywheels (sure doesn't feel it though, feels like it takes an eternity for those revs to drop)

Autos definitely have really light flywheels, but the torque converter more than makes up for the difference

[derbo]

Either way, dual-mass flywheels are heavy!

Friend just installed a lighten dual-mass flywheel on his E36. I am interested in that!

[Smolck]

DMF's do a better of job of dampening engine harmonics/vibration than sprung hub clutches do (I.e. UUC, JBR, or any lightweight piece). You lose some feel and performance though. The E46 ZHP flywheel is 100% the same one used in non ZHP E46 6 speed cars. It is not "more rigid" or lighter or anything like that. It is the same.

And for all the downsides to the stock DMF setup, I have 205k miles on my stock clutch setup, how can you argue with that?

Here is a good video explaining it.

http://youtu.be/DbvP5EvpUbA

[diverse]

Are you sure? Here is a photo of the page from BMW magazine

[IMG][/IMG]



























































In the high-tech command center,
an Alcantara-covered M steering wheel enhances grip































































Word for word this is the text right out of the Bmw magazine

just 3500 rpm, for more power on demand. The tach
boasts an increased redline that starts at 6800 rpm (300
higher than the 330i). Along with the higher-revving
engine, they installed a more rigid flywheel to withstand
the higher output. As an added bonus for weekend racers,
the speed governor was raised to 155 mph (up from 128).
No wonder the needles on both dials are now red – as if
glowing hot.
Who are those visionaries who conceived and built this
fantasy-come-true for dedicated enthusiasts? The project
was awarded to engineers at the BMW Individual Group –
the division responsible for creating unique, limitededition
BMWs. According to Klaus Welsch, Engineering
Head of Testing at BMW Individual, this was an important
project for the team because it was the first time they
were able to create not only the look of the car, but refine
the engine.
Driving the 330i Performance Package is a total sensory
experience. As soon as you turn the key, there’s the lusty
growl of the specially tuned exhaust, played through larger,
custom exhaust tips. The new six-speed manual transmission
is harnessed through a compact gearshift lever for
shorter shift throws and a sportier feel. The engineers even
shortened the rear axle by 3.5 percent (3.07:1) to deliver
noticeably crisper response and greater agility. Step on the
accelerator pedal and there’s a hefty response: the 330i is
eager to run.
A major part of the 330i Performance Package’s
thrilling handling is the specially tuned suspension.
Lower, stiffer and firmer than the already dynamic 330i
Sport Package version, it feels quick on its feet, hugging the
road and tackling curves with gusto. Helping it along are
new 18" M Double Spoke cast alloy wheels and exceptionally
adhesive ZR-rated performance tires – 225/40
front, 255/35 rear, delivering higher cornering speeds with
cool assurance and confidence. Wheel camber is set at
-0.5° – in other words, the tops of the wheels lean into the
22 BMWMagazine
In the high-tech command center,
an Alcantara-covered M steering wheel enhances grip


MW Magazine