Why no 7-8lb light flywheels?

wdkwang · 03-21-2013, 10:03 PM

We have ~15lb aftermarket flywheels but that's pretty much what some cars come stock with. Those cars would then have ~7lb flywheels as an aftermarket option. I understand there are reasons for a flywheel being too light (like 4lb race models) making it hard to modulate at low speeds but I don't see why 7lb would be an issue

chrischhorn · 03-21-2013, 10:07 PM

Quote:

Originally Posted by wdkwang

We have ~15lb aftermarket flywheels but that's pretty much what some cars come stock with. Those cars would then have ~7lb flywheels as an aftermarket option. I understand there are reasons for a flywheel being too light (like 4lb race models) making it hard to modulate at low speeds but I don't see why 7lb would be an issue

I personally would hate a 7lb flywheel on this car. Too much chatter as is, engagement and shifting is tricky enough as is also. Not to mention a 15lb flywheel is already HALF of what our OEM ones are. Anything lighter is excessive and not a justifiable tradeoff if on a DD. Just my .02

JC671 · 03-21-2013, 11:52 PM

Quote:

Originally Posted by wdkwang

We have ~15lb aftermarket flywheels but that's pretty much what some cars come stock with. Those cars would then have ~7lb flywheels as an aftermarket option. I understand there are reasons for a flywheel being too light (like 4lb race models) making it hard to modulate at low speeds but I don't see why 7lb would be an issue

I too wondered why.. But just remember that our cars are twin disk unlike others stock. I hate how long it takes for the rpms to move while revving and how slow it comes down.

I want it to blip so that's my next investment.

Japanjay · 03-22-2013, 12:42 AM

I run a 7.5lb Fidanza and a Competition Clutch Stage4 unsprung/rigid in my other car. The clutch weighs maybe 4-5lbs. Car revs like a crotch rocket.

fuct · 03-22-2013, 09:44 AM

given that the factory flywheel is in the 30 lb range wouldnt that be too much of a shock on the engine to got that light?

personally i had a fidanza light weight flywheel on my last car, and daily driving was a b1tch. :/

wdkwang · 03-22-2013, 10:42 AM

Quote:

Originally Posted by JC671

I too wondered why.. But just remember that our cars are twin disk unlike others stock. I hate how long it takes for the rpms to move while revving and how slow it comes down.

I want it to blip so that's my next investment.

You mean dual-mass, not twin disk, right? The only reason we have 30lb flywheel is cause by design it's a dual mass to keep the car quiet so that it'll sell to a wider market. Some people are pansies and b1tch bout noise on a sports cars. One of the biggest threads here is about noise :smh:

Motion Lab · 03-22-2013, 11:11 AM

For street driving something too light will make engagement difficult. Also you could end up getting misfire codes from the flywheel being so light. The way the car manages timing, by taking that much off the flywheel (which on these cars also has the timing marks) would essentially throw the ECU off due to the different rate of acceleration on the combustion stroke. So its nice to have the car rev fast and a lightweight clutch assembly will allow you to row through the gears more quickly, but going to extreme will just make you regret it on your daily driver.

We just finished installing the OSGiken TR2CD twin disc clutch in a 2011 NISMO, and I dont think you really want anything much lighter than that haha.

Thanks,
Alex Goodwin
AlexG@motionlabtuning.com

JC671 · 03-22-2013, 02:41 PM

Quote:

Originally Posted by wdkwang

You mean dual-mass, not twin disk, right? The only reason we have 30lb flywheel is cause by design it's a dual mass to keep the car quiet so that it'll sell to a wider market. Some people are pansies and b1tch bout noise on a sports cars. One of the biggest threads here is about noise :smh:

Correct Sir.... TBH IMO I would prefer the car to have the maximum ability/modification when modding to get the best bang per mod per say.

But for some people their intended use for the car is different than others. Also location has alot to deal with it.

ChipsWithDips · 03-22-2013, 02:52 PM

Quote:

Originally Posted by wdkwang

You mean dual-mass, not twin disk, right? The only reason we have 30lb flywheel is cause by design it's a dual mass to keep the car quiet so that it'll sell to a wider market. Some people are pansies and b1tch bout noise on a sports cars. One of the biggest threads here is about noise :smh:

I was kinda pissed at first about the road noise on my 370, but mosty because I could hardly hear the engine rpm over the tires. Solution: long tube headers and catback

wdkwang · 03-22-2013, 05:58 PM

Quote:

Originally Posted by Motion Lab

For street driving something too light will make engagement difficult. Also you could end up getting misfire codes from the flywheel being so light. The way the car manages timing, by taking that much off the flywheel (which on these cars also has the timing marks) would essentially throw the ECU off due to the different rate of acceleration on the combustion stroke. So its nice to have the car rev fast and a lightweight clutch assembly will allow you to row through the gears more quickly, but going to extreme will just make you regret it on your daily driver.

We just finished installing the OSGiken TR2CD twin disc clutch in a 2011 NISMO, and I dont think you really want anything much lighter than that haha.

Thanks,
Alex Goodwin
AlexG@motionlabtuning.com

Is it all in relativity with only going up to half the oem weight? For example, we aren't getting anything lighter than 14-15lb flywheels. Cars like Hondas get 7lb flywheels from their oe 15lb'ers.
I drove a friend's 370 that had a light flywheel and stage3 clutch, and it felt day and night different fom my stock junk. Also much easier to drive, and blip downshift. I just figure there is room for more lightness in the revs to make it like a Honda touge racer. One of the biggest complaints from pro drivers bout our vq's is how slow it revs

Dwnshift · 03-22-2013, 09:16 PM

Tilton race flywheel 9.9 lbs

wdkwang · 03-22-2013, 11:16 PM

Quote:

Originally Posted by Dwnshift

Tilton race flywheel 9.9 lbs

wow the tilton is f0king beast. revs like a ferrari or a bike
i looked on their main site but there's no application list for nissans, nor can I find any vendors for it.

Motion Lab · 03-23-2013, 01:26 PM

Quote:

Originally Posted by wdkwang

Is it all in relativity with only going up to half the oem weight? For example, we aren't getting anything lighter than 14-15lb flywheels. Cars like Hondas get 7lb flywheels from their oe 15lb'ers.
I drove a friend's 370 that had a light flywheel and stage3 clutch, and it felt day and night different fom my stock junk. Also much easier to drive, and blip downshift. I just figure there is room for more lightness in the revs to make it like a Honda touge racer. One of the biggest complaints from pro drivers bout our vq's is how slow it revs

I dont really believe that its relative to it being 1/2 the weight. The Subaru STi we work with here are notorious for this issue. The OEM is around 18.2lbs and pretty much once you get under that 12lb mark you can expect an intermittent p0300 for random misfires. I believe its simply in the ECU coding, atleast thats what I assume. An engineer at Nissan might say otherwise though haha

Thanks,
Alex Goodwin
AlexG@motionlabtuning.com

7419sundat · 03-23-2013, 07:29 PM

Can anyone confirm if that Tilton flywheel is compatible on a 370z?

Dwnshift · 03-23-2013, 10:10 PM

It was made originally when AM Performance started running the car. There are only a couple out there in existence ...but they have the drawings.
Not sure they have any readily available.

03-21-2013, 10:03 PM	#1 (permalink)
wdkwang Track Member Join Date: Nov 2010 Location: N/A Posts: 899 Drives: slidewayz Rep Power: 21	Why no 7-8lb light flywheels? We have ~15lb aftermarket flywheels but that's pretty much what some cars come stock with. Those cars would then have ~7lb flywheels as an aftermarket option. I understand there are reasons for a flywheel being too light (like 4lb race models) making it hard to modulate at low speeds but I don't see why 7lb would be an issue __________________ Powerhouse Amuse \| K&N Typhoon Intakes \| MotorDyne ART Pipes \| Borla Catback Exhaust \| B&M Short Shifter \| Intake Ducts \| Ichiba 25mm F/R Spacers \| Carbon Fiber Interior Vinyl Wrap \| Tints \| 10000k HIDs \| Vtak, yo!

03-22-2013, 11:11 AM	#7 (permalink)
Motion Lab A True Z Fanatic Join Date: Jul 2012 Location: Charlotte, NC Posts: 2,676 Drives: Nissan 370Z Rep Power: 18	For street driving something too light will make engagement difficult. Also you could end up getting misfire codes from the flywheel being so light. The way the car manages timing, by taking that much off the flywheel (which on these cars also has the timing marks) would essentially throw the ECU off due to the different rate of acceleration on the combustion stroke. So its nice to have the car rev fast and a lightweight clutch assembly will allow you to row through the gears more quickly, but going to extreme will just make you regret it on your daily driver. We just finished installing the OSGiken TR2CD twin disc clutch in a 2011 NISMO, and I dont think you really want anything much lighter than that haha. Thanks, Alex Goodwin AlexG@motionlabtuning.com wdkwang likes this.

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03-22-2013, 12:42 AM	#4 (permalink)
Japanjay Track Member Join Date: Mar 2012 Location: Puyallup Posts: 856 Drives: 09 Nissan 370z MB M6 Rep Power: 14	I run a 7.5lb Fidanza and a Competition Clutch Stage4 unsprung/rigid in my other car. The clutch weighs maybe 4-5lbs. Car revs like a crotch rocket.

03-22-2013, 09:44 AM	#5 (permalink)
fuct A True Z Fanatic Join Date: May 2009 Location: Sugar Land Posts: 3,692 Drives: 97' Ranger :) Rep Power: 24	given that the factory flywheel is in the 30 lb range wouldnt that be too much of a shock on the engine to got that light? personally i had a fidanza light weight flywheel on my last car, and daily driving was a b1tch. :/

03-22-2013, 09:16 PM	#11 (permalink)
Dwnshift Track Member Join Date: Feb 2012 Location: Cincy Posts: 717 Drives: NISMO 370Z RC Rep Power: 14	Tilton race flywheel 9.9 lbs

03-23-2013, 07:29 PM	#14 (permalink)
7419sundat Base Member Join Date: Aug 2011 Location: colorado Posts: 145 Drives: 09 370z Gtm TT 2 Rep Power: 14	Can anyone confirm if that Tilton flywheel is compatible on a 370z?

03-23-2013, 10:10 PM	#15 (permalink)
Dwnshift Track Member Join Date: Feb 2012 Location: Cincy Posts: 717 Drives: NISMO 370Z RC Rep Power: 14	It was made originally when AM Performance started running the car. There are only a couple out there in existence ...but they have the drawings. Not sure they have any readily available.