Cons to a lowered weight pulley set? - Page 3 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

wootwoot · 08-02-2014, 03:37 PM

Not this again!

I researched this feverishly a few months back. I started a similar thread that induced a lengthy debate. As always with this topic, no one agreed on anything.

Here is my opinion: Despite what others may say I believe the crank shaft pulley IS in fact a harmonic dampener (NOT a harmonic balancer). The debate over this will never be settled. What I think most of us can agree on, however, is that the performance benefits of a new crank pulley are marginal at best. When we weigh the possible costs against these marginal gains it seems apparent that a pulley simply isn't worth it. Despite what you believe why would you put your engine at risk (even if only perceived) for what amounts to very minimal benefit?

My 2 cents...

carbonBLUE · 08-02-2014, 04:32 PM

What about a super damper?

@wootwoot

86-tundra · 08-02-2014, 05:07 PM

Biggest con seems to me is that your wallet is now lighter.

waste of $ imo

ZionsWrath · 08-02-2014, 05:08 PM

Quote:

Originally Posted by trevorovert

Biggest con seems to me is that your wallet is now lighter.

waste of $ imo

Part of the weight savings brah!

86-tundra · 08-02-2014, 05:12 PM

Quote:

Originally Posted by ZionsWrath

Part of the weight savings brah!

I should be a part of the weight gaining club. I'm not good at weight savings on the car

ZionsWrath · 08-02-2014, 05:13 PM

Quote:

Originally Posted by trevorovert

I should be a part of the weight gaining club. I'm not good at weight savings on the car

Share the weight gains and put some of those benjamins in my pocket

Brinks · 08-02-2014, 05:43 PM

Quote:

Originally Posted by trevorovert

Biggest con seems to me is that your wallet is now lighter.

waste of $ imo

Marginal gains for marginal money, doesn't seem like that bad of a deal to me. Guess it all comes down to what you want to accomplish with your build. Going FI or staying stock, then ya it's kinda worthless. Trying to squeeze out every last bit of power from a NA setup in conjunction with a CF driveshaft, lightweight rotors and wheels then it might be worth it

Captain Snooze · 08-02-2014, 06:05 PM

Same ol' same ol'.
Yeah, I'm quoting myself.

Quote:

Originally Posted by Captain Snooze

This subject has already been done to death.
I will summarize it for you:
1/ OMG!! This mod has released at least 40 megaWatts and now I can beat Veyrons from the lights.
2/ This mod is a waste of money and you would be better off going on a diet.

A search on these forums of "light weight pulley" would have given you these results in addition to the link above. This is not the full list.
http://www.ft86club.com/forums/showthread.php?t=61709
http://www.ft86club.com/forums/showthread.php?t=56931
http://www.ft86club.com/forums/showthread.php?t=47079
http://www.ft86club.com/forums/showthread.php?t=13259
http://www.ft86club.com/forums/showthread.php?t=43556
http://www.ft86club.com/forums/showthread.php?t=12450

That's weird. I seem to have got the possible powa increase mixed up. 47GW or 40 megaWatts is still a metric truck load. You would be better off using imperial measurements because then you would have even more powa.

Infamous Performance · 08-02-2014, 06:38 PM

Quote:

Originally Posted by WallsAndFoundations

Gotcha. So me owning a manual I'll still feel a difference. . Just not as much as an auto.

In your opinion - as it seems you know your shit - is it worth it? Only 300 bucks or so and it seems to add a decent amount of performance.. and a possible MPG boost you say?

At $300 I hesitate. At $150 I buy. Pricing on FA pulleys is higher than EJ pulleys and it is a production numbers game. So, I would expect up to $250 for a FA pulley (for now).

On my own AT cars I run a LWCP. On my MT cars I run a LWFW.

Infamous Performance · 08-02-2014, 06:42 PM

Quote:

Originally Posted by Akari

Can you explain why this would be? 4lbs off the crank pulley saves you the same amount of rotational mass on both a MT and AT. From a physics standpoint the power gain from it has to be identical, why do you say this is felt more in a AT?

Also 1-2mpg seems like quite the overstatement. 4lbs less of rotational mass at the crank typically equates to more like a .1-.2mpg at most in my experience. Do you have any evidence to back this up?

Torque converter. AT's do not transfer power the same as MT's. Just as AT cars do not accelerate as fast as MT cars (from the factory).

Yes. My own AT cars. Due to electronic throttle and tuning there is always a sweet spot for cruising MPG. Find the sweet spot and with a LWCP you can gain 1-2 MPG cruising. Its not that easy to drive in the sweet spot (it takes some modulation) and its not any fun. So, 99.97% of owners never realize it. They are not putting go fast parts on the car and then not using the throttle.

Infamous Performance · 08-02-2014, 07:03 PM

Quote:

Originally Posted by Brinks

Seems like the other pulleys would be just as important. Don't they all share the same load? less weight less resistance......

The is so little to be had by replacing the alt and water pump pulleys it is not worth the expense. If it is a pure race car and you earn a living winning, it makes a difference.

On forced induction cars running all 3 LW pulleys we have seen issues with load changes that cause idle stumbles/stalls.

Infamous Performance · 08-02-2014, 07:09 PM

Quote:

Originally Posted by Malt

As for Infamous Performance claims of issues with pulleys and lightened flywheels, I have yet to see anyone talk of problems with the FA20 motor. Infact I'm fairly certain there are several people running full raceseng S2 set, lightened flywheels, and carbon driveshafts with no problems. Sure there might have been issues with the EJ's (uggh, hello 02-03 WRX) but this is a completely new motor and I'm failing to see how the two are related.

The FA block is similar enough to the EJ. Neither motor has a harmonic balancer. Both motors rely on the small amount of rubber in the crank pulley to absorb vibration. We have already seen internal bearing damage from combining a LWCP and LWFW in the FA motor.

Infamous Performance · 08-02-2014, 07:10 PM

Quote:

Originally Posted by carbonBLUE

What about a super damper?

@wootwoot

Actually very nice. But a pain to install (initially). Some need to be pressed on.

WallsAndFoundations · 08-02-2014, 09:56 PM

Quote:

Originally Posted by Captain Snooze

Same ol' same ol'.
Yeah, I'm quoting myself.

That's weird. I seem to have got the possible powa increase mixed up. 47GW or 40 megaWatts is still a metric truck load. You would be better off using imperial measurements because then you would have even more powa.

Sorry dude. I'm using tapatalk and the search function isn't very helpful honestly... I did search but it brings me back a bunch of threads completely not relevant

08-02-2014, 04:32 PM	#30
carbonBLUE Reverse Burnouts Join Date: Oct 2011 Drives: 2013 Argento FRS Location: dallas!!! Posts: 2,894 Thanks: 707 Thanked 1,257 Times in 592 Posts Mentioned: 30 Post(s) Tagged: 1 Thread(s)	What about a super damper? @wootwoot __________________ 2000 Carbon Blue Toyota Celica GTS 152000 miles (wont forget you) 2013 Argento Scion FR-S 2011 Infiniti G37x

08-02-2014, 05:07 PM	#31
86-tundra Troll Hunter Join Date: Aug 2013 Drives: fr-s, tundra Location: Somewhere Posts: 1,424 Thanks: 1,695 Thanked 922 Times in 470 Posts Mentioned: 39 Post(s) Tagged: 0 Thread(s)	Biggest con seems to me is that your wallet is now lighter. waste of $ imo __________________ DIY Winjet Retrofit

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Light weight flywheel and crank pulley?	wootwoot	Engine, Exhaust, Transmission	133	06-23-2015 02:04 PM
Light Weight Pulley's	exam2300	Engine, Exhaust, Transmission	18	02-08-2014 01:02 AM
FS:PERRIN Light weight pulley NEW $85 Shipped	Amalgamo	Engine, Exhaust, Bolt-Ons	1	05-01-2013 12:10 PM
FS - Agency Power Light Weight Pulley	Kochinopride	Engine, Exhaust, Bolt-Ons	3	11-12-2012 06:32 PM

08-02-2014, 03:37 PM	#29
wootwoot Senior Member Join Date: Jul 2012 Drives: FRS Location: Cali Posts: 1,558 Thanks: 188 Thanked 462 Times in 264 Posts Mentioned: 9 Post(s) Tagged: 0 Thread(s)	Not this again! I researched this feverishly a few months back. I started a similar thread that induced a lengthy debate. As always with this topic, no one agreed on anything. Here is my opinion: Despite what others may say I believe the crank shaft pulley IS in fact a harmonic dampener (NOT a harmonic balancer). The debate over this will never be settled. What I think most of us can agree on, however, is that the performance benefits of a new crank pulley are marginal at best. When we weigh the possible costs against these marginal gains it seems apparent that a pulley simply isn't worth it. Despite what you believe why would you put your engine at risk (even if only perceived) for what amounts to very minimal benefit? My 2 cents...

User Name		Remember Me?
Password