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Thread: SR Flywheels

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Posts: 1-10 of 186
2008-07-20 18:23:02
#1
SR Flywheels
Advantages of Light Flywheels


Neil's comments are right on the money, and describe the effect well. No one ever said that a lightened flywheel would increase horsepower, but it sure does *decrease* acceleration times. Herb Adams, in his book CHASSIS ENGINEERING, says that "..the effect of reducing rotational inertia on driveline parts has 15 times the benefit of just reducing the weight of the car." I have been intrigued with this statement for months, and wish that I had followed his suggestion a long time ago and gone to a lightened flywheel. I am not an engineer (obviously), but I do have enough seat time to have a fairly refined butt dyno, and I can tell you that the difference in how the engine spools up is not subtle, but positively sensational. I wish that I had done some quarter mile times (yeah, sure, I go to the drags all the time) before I installed my lightened flywheel, so that I could provide reliable, numerical evidence. I didn't, so believe what you choose, but I can think of absolutely no reason NOT to go to the lightened flywheel. It is the single most important modification that I have made in quite a while, and I have made quite a few.


Suppose you had a magic flywheel with all the mass concentrated at the outer edge. Now the flywheel is stuck directly to the engine, so you can't reduce its effective moment via gearing. The only way you can reduce the moment is by lightening it and/or changing its mass distribution. If you could somehow remove 10 lbs from the rim of the flywheel, and the flywheel's radius was also one foot, then that would have the same effect on acceleration in first gear as reducing the mass of the car by 10x13.57 or 135.7 pounds. Now I am guessing the flywheel's radius is more like six to eight inches or so, so 10 pounds off it's outer edge would have the same effect as reducing the car's mass by more like 70-100 pounds (in first gear). Only you can't take that much weight off the edge, and moments of disks look more like 1/2mr^2, etc. etc. Point is that in first gear, the mass of your car appears to be only 20-30 times that of 10 pounds out at the edge of your flywheel, as far as the engine can tell. So the reduction of weight of the flywheel begins to be pretty significant. Expect bigtime effective acceleration improvements in first gear for proper flywheel lightening, similar to what you'd expect from reducing the weight of the car by anywhere from 70 to 100 lbs or more. The benefits decrease in higher gears in proportion to whatever the ratio is.

Obviously, the lighter your car is to begin with, the bigger an acceleration improvement you'll see since the flywheel mass represents a larger portion of the perceived mass of the car.


Source: SE-R.net


The Common Confusion

Do I need the 108 tooth or the 109 tooth one?

[INDENT]All you ever will need to know is:
108 Tooth = OBDI and OBDII compatible so B13 and B14 (Nissan Stock Amount of teeth)
109 Tooth = OBDI ONLY

The 109 tooth one will work in OBDII cars but will throw a pesky CEL because OBDII cars have the Crank Position Sensor.[/INDENT]


Which Fidanza flywheel should I get?
[INDENT]OBDI = Part # 143201 NIS 11 (109 Teeth) OR Part # 143621 NIS 19 (108 Teeth)
OBDII = Part # 143621 NIS 19 (108 Teeth) ONLY[/INDENT]


WARNING!
The FSM states to keep any magnetic objects away from the Flywheel's Ring. When storing the flywheel make sure you do not store it by any magnets or magnetized items. Same goes for the installation.


Flywheels Made for FWD SR20DE/SR20VE Motors


There are a few brands of flywheels for our wonderful motors. You can find a the list below:

Note: Not all pictures are exactly of a SR20 flywheel, but just of that brand.

B14 Stock - From 1999 Sentra SE-L SR20DE
Part #: TO BE UPDATED
Teeth: 108
Material: Na
Actual Weight: 18.60lbs proof
Retail Price:
Street Price: ~$50 Used

P11 Stock - From 2000 P11 SR20DE Roller Rocker
Part #: TO BE UPDATED
Teeth: 108
Material: Na
Actual Weight: 19.60lbs
Retail Price:
Street Price:


SR16VE Stock
Part #: TO BE UPDATED
Teeth: 108
Material: Na
Actual Weight: 16.6lbs
Retail Price:
Street Price: ~$100 Used


Fidanza - Fidanza Flywheel's is the proffered choice by most SR20 owners.


Part #: 143621 NIS 19
Teeth: 108 (personally counted)
Material: 6061-T6 Aluminum Billet
Advertised Weight: 8.5lbs
Actual Weight: 10.15lbs (proof)
Retail Price: $459
Street Price: ~$300 New, ~$150-$300 Used Depending on condition
Link To Item

Part #: 43201 NIS 11
Teeth: 109
Material: 6061-T6 Aluminum Billet
Advertised Weight: 8.5lbs
Actual Weight: 9.85lbs (proof)
Retail Price: $439 New
Street Price: ~$285 New, ~$150-$300 Used Depending on condition
Link To Item


JWT

Part #: LSER1-NF000
Teeth:
Material: 6061-T6 Aluminum Billet
Advertised Weight: 9lbs
Actual Weight: N/A
Retail Price: $425.00
Street Price:
Link to Item

Part #: LSR20-TF000
Teeth:
Material: 6061-T6 Aluminum Billet
Advertised Weight: 11lbs
Actual Weight: N/A
Retail Price: $425.00
Street Price:
Link to Item


JUN AUTO LIGHTWEIGHT
Part #: 2001M-N014
Teeth:
Material: Chromly
Advertised Weight: 10.3lbs (4.7 kg)
Actual Weight:
Retail Price: N/A
Street Price: N/A
Link to Item


JUN AUTO ULTRA LIGHTWEIGHT
Part #: 2010M-N014
Teeth:
Material: Chromly
Advertised Weight: 9.4lbs (4.3 kg)
Actual Weight:
Retail Price:
Street Price: N/A
Link to Item


XTD

Part #: N/A
Teeth: 109
Material: Chrome-Moly Steel
Advertised Weight: 9lbs
Actual Weight: 10.5lbs as weighed by an SR Member - Thread can be found here
Retail Price: $169 New
Street Price:
Link to Products


eCLUTCHMASTER

Part #: N/A
Teeth: 108
Material: Aluminum and Chromoly
Advertised Weight: 9lbs
Actual Weight: N/A
Retail Price: $189.99 New
Street Price:
Ebay Item



Part #: SR20DEFLW
Teeth: 109
Material: Aluminum and Chromoly
Advertised Weight: 13lbs
Actual Weight: 12.6lbs Proof
Retail Price: $189.99 New
Street Price:
Ebay Item


F1 Racing

Part #: N/A
Teeth: 109
Material: 4140 Forged Chromoly Steel
Advertised Weight: 13.3lbs
Actual Weight: 13.4 lbs
Retail Price: $165 New
Street Price:
This Item Can Be Found on eBay.

Stillen / AASCO

Part #: 451605 - Mfg # 101701-11
Teeth: N/A
Material: 7075-T6, Non-weldable aluminum, stronger than 6061
Advertised Weight: 9lbs
Actual Weight: 9.6lbs
Retail Price: 432.08
Street Price: ~$335
Link to Item


AdFab

Part #: N/A
Teeth: 109
Material: N/A
Advertised Weight: N/A
Actual Weight: 9.2
Retail Price: N/A
Street Price: ~$150


UnorthodoxRacing - UR

Part #: 061010700 - Aluminum Flywheels (Ultra L)
Teeth: N/A
Material: 6061-T6 Aluminum Billet
Advertised Weight: Shipping Weight 10lbs
Actual Weight: N/A
Retail Price: $634.91
Street Price: N/A
Link To Item


Clutchnet
Part #: 21843 - SKU: 7147FG81
Teeth: N/A
Material: Aluminum
Advertised Weight: 12lbs
Actual Weight: N/A
Retail Price: $329
Street Price: N/A
Link To Product


PAR

Part #: PARFWSR20
Teeth: 108
Material: Billet 4140 Chrome Moly steel
Advertised Weight: 9lbs
Actual Weight: N/A
Retail Price: $550.00
Street Price: N/A
Link To Product


SPEC



Part #: 0014920
Teeth: Assuming 108 (On Website it states for Nissan 200SX 1995-1999 2.0L SE-R)
Material: Aluminum
Advertised Weight: N/A
Actual Weight: N/A
Retail Price: $409
Street Price: Around $350
Link To Product



Part #: 0014942
Teeth: Assuming 109 (On Website it states for Nissan Sentra 1991-2001 2.0L SE-R)
Material: Aluminum
Advertised Weight: N/A
Actual Weight: N/A
Retail Price: $389
Street Price: Around $350
Link To Product


Competition Clutch


Part #: 2-727-ST "Lightweight"
Teeth: Advertised 108, not confirmed
Material: Steel
Advertised Weight: 10.9 lbs
Actual Weight: N/A
Retail Price: N/A
Street Price: N/A
Link To Product


Part #: 2-727-STU "Ultra Lightweight"
Teeth: Advertised 108, not confirmed
Material: Steel
Advertised Weight: 8.5 lbs
Actual Weight: NA
Retail Price: N/A
Street Price: N/A
Link To Product

Place Holder
Part #: N/A
Teeth: N/A
Material: N/A
Advertised Weight: N/A
Actual Weight: N/A
Retail Price: N/A
Street Price: N/A
Link To Product


Please post any information that you might have about these flywheels, the more posts the more accurate this information will be

Credits for Information and Pictures
F1 Racing Flywheel Pictures - sr20speed
F1 Racing Actual Weight - novadose914
Fidanza 143621 NIS19 Pictures - Vadim
Fidanza 43201 NIS 11 Actual Weight Confirmed - cortrim1
SR16VE Actual Weight - natethebrown
Competition Clutch - natethebrown
AdFab Pictures -
Last edited by Vadim on 2013-08-02 at 23-48-43.
2008-07-21 15:12:15
#2
This is an on going thread. I will be posting pictures soon.
2008-07-21 15:27:47
#3
Will this be a sticky soon?

Originally Posted by Vadim
This is an on going thread. I will be posting pictures soon.


^Where will you be getting the pics? I have a 109 and a 108 fidanza flywheel.
2008-07-21 15:32:19
#4
Originally Posted by MR-4Door-SR20DE
Will this be a sticky soon?



^Where will you be getting the pics? I have a 109 and a 108 fidanza flywheel.


Probably from the manufacturer's websites

Can you do me a favor and Weight the 109 Tooth and the 108 tooth ones?

Then can you sell me the 108 tooth one?
2008-07-21 15:47:21
#5
Originally Posted by Vadim
Probably from the manufacturer's websites

Can you do me a favor and Weight the 109 Tooth and the 108 tooth ones?

Then can you sell me the 108 tooth one?


^The manufacturers only shows a pic of one side. That's why I was asking if there were two different designs of the fidanza, excluding the 108 vs 109 ordeal. The two I have are different on one side, but the same on the other.
2008-07-21 17:03:12
#6
Originally Posted by MR-4Door-SR20DE
^The manufacturers only shows a pic of one side. That's why I was asking if there were two different designs of the fidanza, excluding the 108 vs 109 ordeal. The two I have are different on one side, but the same on the other.


I'm not sure if I will be going into that great of a detail but we will see

But if you could weight them, it would be great
2008-07-21 23:09:27
#7
Updates:
JWT Flywheel
JUN Flywheels
AASCO Flywheel
AdFab Flywheel
UR Flywheel

I will try to get in touch with those companies and find out the amount of teeth in their flywheels.
2008-07-23 17:10:26
#8
A lot of people will agrue the lightweight flywheel comments you made about the way they run on turbo cars. You said, but not so good for turbo? You also said, it will make it harder to drive the car.
Last edited by MR-4Door-SR20DET on 2011-02-09 at 19-02-12.
2008-07-23 17:48:38
#9
Originally Posted by MR-4Door-SR20DE
A lot of people will agrue the lightweight flywheel comments on turbo cars. You said but not so good for turbo? You also said it will make it harder to drive the car.


I will have to go in and update it. Thanks for bringing it up

I've heard of many cases were a too light of a flywheel made the car hard to drive, but they probably meant to keep it in boost.
2008-07-23 19:58:38
#10
Yah, there are no facts or otherwise to support the myth that a light weight flywheel can hinder turbo car performance in any way. I don't even feel it needs to be disproved, as it's not even a well established myth. I and others are more than willing to dispel any concerns though if we must. For now, can we just get rid of or modify this?

Originally Posted by Vadim

Turbo - With turbo, too light of a flywheel will make the car fall out of boost too quickly.

Fidanza's 8.5lb flywheels are known to be best for NA, but are little too light for turbo.

A forum member used the XTD 10.5lb flywheel and was very satisfied with the results.[/INDENT]
Last edited by BenFenner on 2013-05-31 at 12-54-25.
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