VQ35DE Flywheels and Rotational Mass Discussion
05-29-2011, 12:05 PM
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VQ35DE Flywheels and Rotational Mass Discussion
I have been trying to find information in lightweight flywheels as I will be changing my clutch/flywheel in the coming weeks and I couldn't seem to find a good guide or list of information on each flywheel or the effects of such on our cars so I am writing one.
First a few things on how rotational mass works and the effects of that mass on various engine parts.
http://news.carjunky.com/automotive/...nal_Mass.shtml
http://www.w8ji.com/rotating_mass_acceleration.htm
http://forums.bimmerforums.com/forum...p/t-79243.html
In summary, because you measure the power gained during accelaration in terms of power over time the lightest may not be the best. You need to find the correct flywheel for your application. Personally based on my reasearch I think that in a 1/4 mile situation the effect ranges from detrimental (Less stored mass for launch) to minimal(Lots of time, very little HP saved). In an autoX situation you may notice more of a difference because there are more short bursts of accellaration. It would also change greatly if you had some 8k RPM revving monster because the formula is also based on RPM.
Also, the lighter a flywheel is the more it may tear up your vehicle over time as the weight of a flywheel absorbs the power pulses from the engine. It can also mean harder stop - start situations in traffic by increasing revvs to get the vehicle moving. As well as slightly faster shifts to keep the car matched in revs to the transmission. (From my experience and testing the 06z drops to perfect revvs for the next gear after what seems like an eternity anyway). From what I gather combining a good dampening crankshaft pulley with a lightweight flywheel can reduce the negative effects.
That being said, I can't test every flywheel here if anyone has real world time slips, dyno result or other experience (That flywheel exploded, warped or is loud as hell) in a before and after situation (Not a butt dyno result) it would help others later on if we could add it to this thread.
List of 350z Flywheels;
Stock Flywheel
Nismo Flywheel
Aasco Lightweight Flywheel
ACT Prolight
ACT Streetlight
Ark Chromoly
Clutch Masters Lightweight Flywheel
Exedy Chromoly
Fidanza Flywheel
RPS Billet Flywheel
JWT Flywheel
First a few things on how rotational mass works and the effects of that mass on various engine parts.
http://news.carjunky.com/automotive/...nal_Mass.shtml
http://www.w8ji.com/rotating_mass_acceleration.htm
http://forums.bimmerforums.com/forum...p/t-79243.html
In summary, because you measure the power gained during accelaration in terms of power over time the lightest may not be the best. You need to find the correct flywheel for your application. Personally based on my reasearch I think that in a 1/4 mile situation the effect ranges from detrimental (Less stored mass for launch) to minimal(Lots of time, very little HP saved). In an autoX situation you may notice more of a difference because there are more short bursts of accellaration. It would also change greatly if you had some 8k RPM revving monster because the formula is also based on RPM.
Also, the lighter a flywheel is the more it may tear up your vehicle over time as the weight of a flywheel absorbs the power pulses from the engine. It can also mean harder stop - start situations in traffic by increasing revvs to get the vehicle moving. As well as slightly faster shifts to keep the car matched in revs to the transmission. (From my experience and testing the 06z drops to perfect revvs for the next gear after what seems like an eternity anyway). From what I gather combining a good dampening crankshaft pulley with a lightweight flywheel can reduce the negative effects.
That being said, I can't test every flywheel here if anyone has real world time slips, dyno result or other experience (That flywheel exploded, warped or is loud as hell) in a before and after situation (Not a butt dyno result) it would help others later on if we could add it to this thread.
List of 350z Flywheels;
Stock Flywheel
Code:
Price ~$750 Weight 28LBS Material Forged Steel Replaceable Friction Surface No Machinable Yes and no, it can only be machined flat Mounts to Stock Clutch Yes
Code:
Price ~$500 Weight 20LBS Material Forged Steel Replaceable Friction Surface No Machinable XXX Mounts to Stock Clutch Yes
Code:
Price ~$600 Weight 13LBS Material Aluminum 6061-T1 Replaceable Friction Surface Yes Friction Surface Cost XXX Mounts to Stock Clutch Yes
Code:
Price ~$560 Weight 13.2 LBS Material Chromoly Forged Replaceable Friction Surface No Machinable Yes Mounts to Stock Clutch Yes
Code:
Price ~$540 Weight 16.9 LBS Material Chromoly Forged Replaceable Friction Surface No Machinable Yes Mounts to Stock Clutch Yes
Code:
Price ~$500 Weight XXX LBS Material Chromoly Forged Replacable Friction Surface No Machineable Yes Mounts to Stock Clutch Yes
Code:
Price ~$580 Weight 15LBS Material Aluminum 6061-T1 Replacable Friction Surface Yes Friction Surface Cost ~$100 Mounts to Stock Clutch Yes
Code:
Price ~$610 Weight 19.6 LBS Material Chromoly Forged Replacable Friction Surface No Machineable Yes Mounts to Stock Clutch Yes
Code:
Price ~$480 Weight 13.5LBS Material Aluminum 6061-T1 Replacable Friction Surface Yes Friction Surface Cost ~$60 Mounts to Stock Clutch Yes
Code:
Price ~$580 Weight 18LBS Material Aluminum 6061-T1 Replacable Friction Surface Yes (Multi Segment) Friction Surface Cost XXX Mounts to Stock Clutch No
Code:
Price ~$450 Weight 14LBS Material Aluminum 6061-T1 Replacable Friction Surface Yes Friction Surface Cost ~$80 Mounts to Stock Clutch Yes (And Others)
05-29-2011, 02:06 PM
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Jwt exploded on me.. Stripped threads! Currently using act streetlite.
$425
16 lbs (I think)
Steel
Non replaceable surface
Non Machinable (as per ACT)
Stock clutch should mount up...
jus offering my .02 correct me if I'm wrong.....
$425
16 lbs (I think)
Steel
Non replaceable surface
Non Machinable (as per ACT)
Stock clutch should mount up...
jus offering my .02 correct me if I'm wrong.....
05-29-2011, 03:48 PM
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The ability to find it all in on spot without reading 200 posts or search the web for 3 days. If we want people to ask fewer repetitive questions, I figure making the information easier to find is a good way to start.
Last edited by kingkai; 05-29-2011 at 03:51 PM.
