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Old 04-24-2009, 12:50 PM   #1
LexDiamonds
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Question Crank Pulley or Flywheel?

I ,m thinkning about buying a lightweight flywheel and a lightweight crank pulley. But I heard putting both of this on at the same time will throw the engine out of balance. Its gotta be one or the other. Is their any truth to this rumor? or what's the real deal? and will adding one of this two change my engine perfomance?
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Old 04-24-2009, 01:51 PM   #2
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This stuff is covered in the newbie FAQ's: http://forums.nasioc.com/forums/showthread.php?t=533787
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Old 04-24-2009, 02:32 PM   #3
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Something that is not covered in the FAQ is according to Kartboy, his pulley will allow you to use a lightened flywheel as well, due to his pulley being significantly heavier than a Cobb or Perrin for example.
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Old 04-24-2009, 02:47 PM   #4
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The flywheel alone can throw a CEL from time to time, if it's light enough.
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Old 04-24-2009, 02:56 PM   #5
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Quote:
Originally Posted by dauss View Post
Something that is not covered in the FAQ is according to Kartboy, his pulley will allow you to use a lightened flywheel as well, due to his pulley being significantly heavier than a Cobb or Perrin for example.
that depends a lot on what flywheel youre going to be pairing it up with. Though if it's sufficiently heavy enough to allow one to run a 14lb flywheel without throwing a code, why bother doing it at all?
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Old 04-24-2009, 10:30 PM   #6
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If you like to dragrace at all I would advise against the flywheel. It will kill your 60' time. It makes the car more difficult to launch.
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Old 04-25-2009, 12:14 AM   #7
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13.8lbs flywheel, any lighter will throw CEL

flywheel over pulley anyday
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Old 04-25-2009, 12:24 AM   #8
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i have been told to get as light as you can get. like the prolite (9 lbs) and get it tuned. i have felt and seen the differance and am going to get it. just my opinion but if you get do this and dont get tuned you are probably sacrificing a lot of spool time.
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Old 04-25-2009, 01:23 AM   #9
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Quote:
Originally Posted by rebel1988us View Post
i have been told to get as light as you can get. like the prolite (9 lbs) and get it tuned. i have felt and seen the differance and am going to get it. just my opinion but if you get do this and dont get tuned you are probably sacrificing a lot of spool time.

A whole mess of misinformation . How exactly do you tune for a flywheel?

And getting 'the lightest you can get' is advice from a person who should never be giving advice again. It all depends on your personal tastes, but a 9lb flywheel will be a bitch on the streets with most clutches, and for most drivers regardless, with the cons outweighing the pros.

Quote:
Originally Posted by KitchenerWRX View Post
13.8lbs flywheel, any lighter will throw CEL

flywheel over pulley anyday
Also not true, there is no magical weight at which point it throws a CEL. But I will say that after using a few, I think the ACT Streetlite 13.9lb flywheel is the perfect 'in-between.' It's the heaviest of the lightweight flywheels, giving you most the benefits of the lighter ones with the driveability and a bit more of the launchability of the heavier ones. FYI they don't make a 13.8, unless you're referring to the ACT (close enough )
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Old 04-25-2009, 03:24 AM   #10
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Quote:
Originally Posted by Audiosavvy View Post
Also not true, there is no magical weight at which point it throws a CEL. But I will say that after using a few, I think the ACT Streetlite 13.9lb flywheel is the perfect 'in-between.' It's the heaviest of the lightweight flywheels, giving you most the benefits of the lighter ones with the driveability and a bit more of the launchability of the heavier ones. FYI they don't make a 13.8, unless you're referring to the ACT (close enough )
Okay, I am confused by the Exedy flywheel weight. In some cases it looks to be heavier than the ACT Streetlite flywheel:

Exedy Lightweight Flywheel

14.3 lbs according to:
http://www.maperformance.com/exedy-r...wheel-wrx.html
http://www.amazon.com/Exedy-FF01-Lig...0644029&sr=1-1

while other places show it weighing less at 12.7 lbs according to:
http://www.advancespeedshop.com/exed...01-p-5599.html
http://www.oakos.com/Merchant2/merch...t_Code=EXEFF01 (12.78 lbs, but close enough)

So who has the wrong information posted as I am definitely considering the Exedy Lightweight Flywheel when I do upgrade my flywheel & clutch.

The main Exedy website doesn't list any information regarding the weight of the flywheel unfortunately so that wasn't a help.
http://www.exedyusa.com/race/Clutch_Specifications
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Old 04-25-2009, 11:32 AM   #11
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How about a Perrin crank pulley will that affect anything or will it add performance or is just looks?
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Old 04-25-2009, 11:40 AM   #12
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A light flywheel and a heavy clutch is gonna be a PITA to drive in traffic. I had an act streetlight flywheel and act hd disc for a little over a year. I pulled it out and put the stocker back in. Drivablity is much better and now I can launch the car again.

It did however rev up quicker with the light flywheel, but it also dropped off a lot faster as well. With a perrin pulley installed at the same time I would get misfire cels every few days.

As far as the perrin pulley, I installed that first before the flywheel and did not notice any difference whatsoever. Maybe on a dyno you might be able to detect a couple hp but don't expect some dramatic difference from just adding a pulley.
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Old 04-25-2009, 01:49 PM   #13
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i run a cobb crank pulley and i am happy
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Old 04-25-2009, 09:25 PM   #14
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I've got the ACT Streetlight flywheel with their 6-puck sprung hub and it's perfect. You see a marginal loss of inertia, but if you can modulate the clutch, there isn't a significant downside. I've got the Perrin crank pulley but I've been hesitant to install it due to the reports.
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Old 04-26-2009, 07:52 PM   #15
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I have been driving with the ACT streetlite flywheel and perrin pulley for over 50,000 miles and plenty of autox's and spirited driving with absolutley no problems. I have a fairly simple stage 2.5ish tune but I don't drag race. I have never thrown a cell so take it for what its worth.
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Old 04-26-2009, 10:31 PM   #16
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I have tried both and I will offer my opinion:

1. The lightweight pulley makes a more subtle difference than most lightweight flywheels. When starting from a stop, you may get a little more vibration than stock. When accelerating in low gears you may notice a difference (to me, in first the car felt a fair bit lighter, and in second just slightly better than stock, I could not tell any acceleration difference in 3rd gear of above, NOTE: these are butt-dyno numbers, I am just going by feel), others say that they notice no difference at all. The cost is much lower than a flywheel and the install is my easier. I also found that in-gear at low rpms the car feels a little smoother when warmed up.

2. The lightweight flywheel. I have used the heavy WRX flywheel, the stock STi flywheel and the exedy dual plate flywheel (which includes a lightweight clutch). I can honestly say, launching will get harder the lighter you go, but that is not the biggest issue for me. With the stock WRX flywheel everything is smooth and quiet. With the STi flywheel you need more gas to start in day to day driving, and you may get a bit more noise than the WRX one (not much more). However, with the Exedy, everytime you slow down, you will hear the flywheel make noise like something in your car is broken. After riding in other peoples cars with lightweight flywheels, I found that this is normal and expected with a lightweight flywheel.

What I did for flywheels and pulleys over the past few years in order:
1. WRX flywheel (and clutch)
2. Exedy dual plate
3. Went back to WRX flywheel and clutch (with a new clutch though), was so happy to switch back
4. Added a light-weight pulley, the difference was quite noticeable, loved it
-----Did an STi 2.0L engine and transmission swap. Installed the engine with the STi stock pulley.
5. Not so good with WRX flywheel swapped to STi flywheel, clutch, starter, etc.
6. Swapped back on my lightweight pulley, difference from the STi pulley to my GFB one was not as noticeable. Maybe because the flywheel was not as heavy? Still, there was some improvement and I already had the GFB one so I have left it on.
7. I don't plan to change a thing with the pulley or the flywheel again. I am very happy with my current setup

Cliff notes:
-STi Stock flywheel with a lightweight pulley was the best compromise.
-If you are running and WRX and you are doing only one, try the pulley first.
-If you go lighter than the stock flywheel you will tend to get more noise the lighter you go
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Old 04-27-2009, 11:08 AM   #17
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I have a very late model year '02, and have only a streetlight flywheel.
It took very little to get used to it, accelleration is a little better, but off the line you will have to be more determined. I have thrown misfire codes since installation at 1 per 4-5 months. The codes only come on inbetween shifts where the clutch has been disengaged. The CEL eventually goes away in 3~4 drives later.

Dispite of this, the car IS more fun to drive, and more closely matches what feels comfortable with my driving "style". This is only a DD, no track or autoX, and have been driving MT's for 23 years.
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Old 04-27-2009, 12:02 PM   #18
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I know SOA says there's no dampening in our stock pulley, but the lightweight ones still make me uneasy. If anything, I think I'd take some weight penalty to get some dampening...
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Old 05-04-2009, 12:13 PM   #19
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hmm... interesting.. (working on my 04 Sti 2.5l project all stock internals)

I did install a lightwaight (fidanza aluminum) flywheel and and GFB pulleys, but still working on the project and haven't test it yet.
I'm here to read some opinions and know what to expect..
I see some of you get missfire codes once in a while..
I assume all of you that get the missfire codes are still using the stock ECU with stock program, is that correct? if so than I expect if I will use a stand alone ECU with the right tune than I should not get any of those codes.
i'm also eliminating the A/C compressor and condenser. and I hope to be able to rev it to 8000RPM and not have any problems..
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Old 05-04-2009, 03:58 PM   #20
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Quote:
Originally Posted by tolishel View Post
hmm... interesting.. (working on my 04 Sti 2.5l project all stock internals)

I did install a lightwaight (fidanza aluminum) flywheel and and GFB pulleys, but still working on the project and haven't test it yet.
I'm here to read some opinions and know what to expect..
I see some of you get missfire codes once in a while..
I assume all of you that get the missfire codes are still using the stock ECU with stock program, is that correct? if so than I expect if I will use a stand alone ECU with the right tune than I should not get any of those codes.
i'm also eliminating the A/C compressor and condenser. and I hope to be able to rev it to 8000RPM and not have any problems..

an sti is totally different than a 2.0......and do NOT try to compare the 2 in this way
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Old 05-04-2009, 10:53 PM   #21
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^ very true, and my ECU programming is untouched (stock) w/ only I/C "y" and STI axleback (so basically nothing other than the flywheel).
The WRX a/c compressor is clutched so there is little drag when off (moreso with the STI compressor someone claimed).
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Old 05-04-2009, 11:10 PM   #22
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I'm about to finish up "rebuilding" my AP "stage 2" 2.0L, and I'll be running a Perrin LC pulley and ACT 13.9lb with the heavy modified pressure plate and clutch. I've been working on this suby for almost 3 months--reading all these responses, threads, and forums regarding lightweight flywheel+pulley and clutch have made me think twice about the upgrades.....I suppose I'll find out what is best for me.
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