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.do?model=BW53&mospid=47707&btnr=11_3607&hg=11&fg=20

Auto:
http://www.realoem.com/bmw/showparts.do?model=BW53&mospid=47707&btnr=11_2878&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

http://i38.photobucket.com/albums/e147/Steven_Maduro/photo2_zpsd120b63d.jpg (http://s38.photobucket.com/user/Steven_Maduro/media/photo2_zpsd120b63d.jpg.html)



























































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

[Crickett]

diverse, that’s been one of the biggest problems with the Performance Package: there’s a disparity between what the press/marketing materials claimed about the Performance Package and what actual hardware ended up on ZHPs. A similar discussion exists regarding the ZHP’s shocks, springs, and “factory” alignment. Most of the part numbers don’t support the ZHP having many unique, ZHP-only pieces.

[diverse]

That's pretty disappointing..

Not to mention rather fraudulent on Bmw'w part
considering they charged an additional 4,000 for the performance package..

I wonder if It was a case of some cars not getting everything because a factory manager was trying to meet quotas.
and figured who's gonna know.

[ZHPRegistry.net]

Originally Z8s were advertised to have LSD rear ends... years later the Z8 crowd found out their super cars came with an open diff. There were many discrepancies with ZHPs. For a while consumers were led to believe that the suspension was unique... the reality is that aside from a very slight difference in the shocks everything else matches the sport package.

[Crickett]

… the reality is that aside from a very slight difference in the shocks everything else matches the sport package.

Has that been verified?? I’m not aware of any ZHP-unique part numbers for shocks; how can one discern them from standard sport package ones?

[SoCalZman]

Here are the part numbers I have for ZHP specific shocks/struts. I did some digging awhile ago and this is what I found. Hopefully they are correct. If someone wants to confirm and compare to 330i p/n here they are:

strut left: 31312282459
strut right: 31312282460
rear Shocks: 33522282461

[alexandre]

Same as 330i sport. We have different control arms, but apart form that it's the same thing.

[diverse]

That sort of makes sense on the shocks and struts
I think the zhp is a sports package with some extras.
so the lowering aspect helps the sports suspension work better..

But the fly wheel issue could just be a matter of the same flywheel with stiffer springs thus making it more rigid..

I have a hard time conceiving that they would specifically say more rigid to handle rpm output
if it were not true.

stronger springs would be pretty hard to identify.

[az3579]

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)

Interesting that you say it takes an eternity. For me, at low revs (daily driving) the revs drop way too fast for easy rev-matched upshifting. For downshifts, IG takes way too long for the revs to rise so I could grab that ideal rev-match RPM. :(


Originally Z8s were advertised to have LSD rear ends... years later the Z8 crowd found out their super cars came with an open diff. There were many discrepancies with ZHPs. For a while consumers were led to believe that the suspension was unique... the reality is that aside from a very slight difference in the shocks everything else matches the sport package.


Same as 330i sport. We have different control arms, but apart form that it's the same thing.

Yeah the control arms are different. That should be it...

Sent from my DROID RAZR HD using Tapatalk

[Smolck]

That sort of makes sense on the shocks and struts
I think the zhp is a sports package with some extras.
so the lowering aspect helps the sports suspension work better..

But the fly wheel issue could just be a matter of the same flywheel with stiffer springs thus making it more rigid..

I have a hard time conceiving that they would specifically say more rigid to handle rpm output
if it were not true.

stronger springs would be pretty hard to identify.

If the ZHP flywheel had stronger springs why is it the same part # as the non ZHP? 10hp doesn't require stiffer springs inside the DMF

[BoostedZHP]

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

http://i38.photobucket.com/albums/e147/Steven_Maduro/photo2_zpsd120b63d.jpg (http://s38.photobucket.com/user/Steven_Maduro/media/photo2_zpsd120b63d.jpg.html)



























































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

That's because in 2003 when the ZHP first came out, this was true. All other 330i's used the 5 speed trans at the time and the 6 speed did indeed have a more rigid flywheel. In 04, this became invalid as all 330s were made with 6 speeds.


Sent from my iPhone using Tapatalk

[Crickett]

That's because in 2003 when the ZHP first came out, this was true. All other 330i's used the 5 speed trans at the time and the 6 speed did indeed have a more rigid flywheel. In 04, this became invalid as all 330s were made with 6 speeds.


Sent from my iPhone using Tapatalk

P/Ns seem to back that up (for 330i sedans):
• Before March ’03: 21 21 7 512 474, 24.9 lbs
• After March ’03: 21 20 7 533 868, 25.0 lbs

[gmurphy]

That's because in 2003 when the ZHP first came out, this was true. All other 330i's used the 5 speed trans at the time and the 6 speed did indeed have a more rigid flywheel. In 04, this became invalid as all 330s were made with 6 speeds.


Sent from my iPhone using Tapatalk

+1


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