Do Lightweight Pulleys FREE Power? With Poll - Page 6 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Ultramaroon · 09-01-2015, 12:03 AM

Yes. Well, it is for me.

Decay107 · 09-01-2015, 01:14 AM

Hi! Another mechanical engineer checking in. I'd just like to add my own views on this which tend to mirror those of the other engineers in this thread.

1. Stock crank pulley is a harmonic damper, this is a fact.
2. The stock crank pulley costs the OEMs more to manufacture than a simple lathed aluminum piece
3. If an OEM sees a way to save a fraction of a cent, they do it.
4. No, lightweight pulleys do not "FREE power"

Is a lightweight crank pulley going to liquify bearings and make an engine useless? Probably not. Do they look nice? Sure! Does it make the engine spin up faster (in an unloaded state)? Yes! The change is small but measurable. Would I ever install one? Fuck no.

wootwoot · 09-01-2015, 01:38 AM

The part of this whole thing I never understood was this: why risk any issues for what amounts to very minimal enhancement?

Kaotic Lazagna · 09-01-2015, 02:05 AM

My experiences with an NST pulley. I had the crank pulley on my Yaris. Noticed slightly quicker free revs, but nothing different under load. Don't recall feeling any differences in power (and I have a very sensitive butt dyno

) or seeing any mpg changes. I got it for cheap, so I figured why not.

Would I get it for my FR-S, most likely not, even if it was the same price I got the Yaris one for.

steve99 · 09-01-2015, 04:01 AM

Quote:

Originally Posted by Decay107

Hi! Another mechanical engineer checking in. I'd just like to add my own views on this which tend to mirror those of the other engineers in this thread.

1. Stock crank pulley is a harmonic damper, this is a fact.
2. The stock crank pulley costs the OEMs more to manufacture than a simple lathed aluminum piece
3. If an OEM sees a way to save a fraction of a cent, they do it.
4. No, lightweight pulleys do not "FREE power"

Is a lightweight crank pulley going to liquify bearings and make an engine useless? Probably not. Do they look nice? Sure! Does it make the engine spin up faster (in an unloaded state)? Yes! The change is small but measurable. Would I ever install one? Fuck no.

Allaluha brother +1 on that

if you like bling get some ,else spend your money on somthing else.

OkieSnuffBox · 09-01-2015, 06:55 AM

Quote:

Originally Posted by wootwoot

The part of this whole thing I never understood was this: why risk any issues for what amounts to very minimal enhancement?

Because brocar, bro.

Circuit Motorsports · 09-01-2015, 12:03 PM

Quote:

Originally Posted by steve99

Allaluha brother +1 on that

if you like bling get some ,else spend your money on somthing else.

add another +1 to that! The stock damper is there for a reason. remove that and you start running a higher risk for failure. Would it fail on a n/a barely modded car? most likely not but facts are facts..you're removing the dampening capabilities and IF you have enough transfer back to the rotating assembly...kiss it goodbye.

all for the cool look and 'feel' that 'something' is happening? We agree with Steve and Decay107. pass on that. Save your money for a safer way to improve efficiency
- Abel

09-01-2015, 12:03 AM	#71
Ultramaroon extra what? Join Date: Sep 2014 Drives: a 13 e8h frs Location: vantucky, wa Posts: 32,087 Thanks: 52,530 Thanked 36,812 Times in 19,087 Posts Mentioned: 1111 Post(s) Tagged: 9 Thread(s)	Yes. Well, it is for me. __________________ service manuals

09-01-2015, 01:14 AM	#72
Decay107 Turning is for Nerds Join Date: Aug 2013 Drives: 35 characters is not enough Location: PDX Posts: 1,974 Thanks: 836 Thanked 1,259 Times in 717 Posts Mentioned: 186 Post(s) Tagged: 3 Thread(s)	Hi! Another mechanical engineer checking in. I'd just like to add my own views on this which tend to mirror those of the other engineers in this thread. 1. Stock crank pulley is a harmonic damper, this is a fact. 2. The stock crank pulley costs the OEMs more to manufacture than a simple lathed aluminum piece 3. If an OEM sees a way to save a fraction of a cent, they do it. 4. No, lightweight pulleys do not "FREE power" Is a lightweight crank pulley going to liquify bearings and make an engine useless? Probably not. Do they look nice? Sure! Does it make the engine spin up faster (in an unloaded state)? Yes! The change is small but measurable. Would I ever install one? Fuck no. __________________ My build thread / journal / evidence for warranty claim denial Motorcycle build thread Last edited by Decay107; 09-01-2015 at 01:45 AM.

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09-01-2015, 01:38 AM	#73
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)	The part of this whole thing I never understood was this: why risk any issues for what amounts to very minimal enhancement?

09-01-2015, 02:05 AM	#74
Kaotic Lazagna Senior Member Join Date: Apr 2014 Drives: GR Corolla Location: Lathrop, CA Posts: 4,941 Thanks: 3,095 Thanked 3,025 Times in 1,865 Posts Mentioned: 40 Post(s) Tagged: 2 Thread(s)	My experiences with an NST pulley. I had the crank pulley on my Yaris. Noticed slightly quicker free revs, but nothing different under load. Don't recall feeling any differences in power (and I have a very sensitive butt dyno ) or seeing any mpg changes. I got it for cheap, so I figured why not. Would I get it for my FR-S, most likely not, even if it was the same price I got the Yaris one for.

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