Lightweight Pulleys in Turbo application - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

GH05T · 12-03-2014, 06:07 PM

Car will be turbocharged in the Spring and I have a set of lightweight pulleys (Crank+Water+Alternator) ready to be installed. But looking at it, is it even worth putting them on since I am going turbo? I was told that you can either put a lightweight flywheel or lightweight pulleys, but can't have both as it will throw the balance of the engine off and causes a CEL. On top of that there isn't really much noticeable difference between lightweight pulleys and OEM pulleys when going FI. Is this true? Sorry, total novice in these things. Any help is appreciated!

mkivsoopra · 12-03-2014, 06:12 PM

I have turbo + lightweight pulleys + lightweight flywheel

mike the snake · 12-03-2014, 10:39 PM

There's many posts about lightening both ends of the engine causing engine failures due to pounded bearings (harmonics), so what I gather is, lighten one, or the other.

Either go with lightened flywheel, or lightened pulleys, but not both.

Most turbo applications require a better clutch anyways, and most of those clutch kits come with lightened flywheels.

GremlinGSP · 12-04-2014, 02:03 PM

I've got both right now and I'm considering taking the perrin pulley off. Car is pretty hard to take off with in first gear. Wasn't an issue until new clutch. I think Ive read before about one or the other as well. So its definitely something I'm looking into.

edeekeos · 12-04-2014, 02:21 PM

Just out of curiosity, can you guys please link the sources of these 'known engine failures due to lightweight pulleys.'

protpibe · 12-04-2014, 02:30 PM

I had both a lightened flywheel and lightened crank pulley and I ended up taking the pulley off. It was a huge pain in the ass to drive smoothly. After I took the pulley off my gf asked me what I did to the car since it doesn't drive like a POS anymore haha.

Anyways, with or without turbo, there's little-to-no gains from a lightened crank pulley so I wouldn't suggest doing it. This is coming from someone that had one and went back afterwards.

DAN_BRZ · 12-04-2014, 05:59 PM

the only issue i have with my car (pulley kit, flywheel and driveshaft) is that i find my rpms drop way to fast if im being lazy and dont downshift when coming to a stop. the rpms dip way to low almost a stall before the ecu corrects it. Doesnt happen all the time but often enough.

Poodles · 12-05-2014, 03:23 AM

Crank pulley issue has been beaten to death in numerous threads...

The other pulleys would be fine to install (unless they somehow hit any of the turbo components), but the factory pulleys for the accessories aren't very heavy to begin with.

Consider it the cosmetic upgrade it is (unless they're underdrive pulleys, they do nothing for performance but making your wallet lighter)

rb6freak · 12-05-2014, 05:21 AM

Quote:

Originally Posted by edeekeos

Just out of curiosity, can you guys please link the sources of these 'known engine failures due to lightweight pulleys.'

http://www.ft86club.com/forums/showthread.php?t=71240

Read this thread - the information you're seeking is when @Infamous Performance starts to chime in.

12-03-2014, 06:07 PM	#1
GH05T Undercover Batman Join Date: Jan 2013 Drives: 2013 Subaru BRZ Limited Location: Jersey City, NJ Posts: 567 Thanks: 120 Thanked 219 Times in 128 Posts Mentioned: 18 Post(s) Tagged: 0 Thread(s)	Lightweight Pulleys in Turbo application Car will be turbocharged in the Spring and I have a set of lightweight pulleys (Crank+Water+Alternator) ready to be installed. But looking at it, is it even worth putting them on since I am going turbo? I was told that you can either put a lightweight flywheel or lightweight pulleys, but can't have both as it will throw the balance of the engine off and causes a CEL. On top of that there isn't really much noticeable difference between lightweight pulleys and OEM pulleys when going FI. Is this true? Sorry, total novice in these things. Any help is appreciated! __________________ *"He who shall be last, shall be sideways and smiling." - Jeremy Clarkson* Last edited by GH05T; 12-03-2014 at 06:31 PM.

12-04-2014, 02:30 PM	#6
protpibe Senior Member Join Date: Oct 2013 Drives: 4-Runner Sport - 13' BRZ SportTech Location: Winnipeg Posts: 1,395 Thanks: 253 Thanked 839 Times in 459 Posts Mentioned: 18 Post(s) Tagged: 0 Thread(s)	I had both a lightened flywheel and lightened crank pulley and I ended up taking the pulley off. It was a huge pain in the ass to drive smoothly. After I took the pulley off my gf asked me what I did to the car since it doesn't drive like a POS anymore haha. Anyways, with or without turbo, there's little-to-no gains from a lightened crank pulley so I wouldn't suggest doing it. This is coming from someone that had one and went back afterwards. __________________ Top Tier Imports - Check out my build journal HERE

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12-03-2014, 06:12 PM	#2
mkivsoopra Senior Member Join Date: Dec 2012 Drives: BRZ Location: CA Posts: 805 Thanks: 939 Thanked 950 Times in 412 Posts Mentioned: 161 Post(s) Tagged: 1 Thread(s)	I have turbo + lightweight pulleys + lightweight flywheel

12-03-2014, 10:39 PM	#3
mike the snake Senior Member Join Date: Jul 2013 Drives: 2013 BRZ Location: Norcal Posts: 1,592 Thanks: 1 Thanked 623 Times in 378 Posts Mentioned: 15 Post(s) Tagged: 0 Thread(s)	There's many posts about lightening both ends of the engine causing engine failures due to pounded bearings (harmonics), so what I gather is, lighten one, or the other. Either go with lightened flywheel, or lightened pulleys, but not both. Most turbo applications require a better clutch anyways, and most of those clutch kits come with lightened flywheels.

12-04-2014, 05:59 PM	#7
DAN_BRZ Senior Member Join Date: Apr 2013 Drives: 2013 WRB BRZ Sport Tech Location: Mississauga Posts: 413 Thanks: 311 Thanked 122 Times in 73 Posts Mentioned: 7 Post(s) Tagged: 2 Thread(s)	the only issue i have with my car (pulley kit, flywheel and driveshaft) is that i find my rpms drop way to fast if im being lazy and dont downshift when coming to a stop. the rpms dip way to low almost a stall before the ecu corrects it. Doesnt happen all the time but often enough.

12-05-2014, 03:23 AM	#8
Poodles Senior Member Join Date: Oct 2013 Drives: 2015 Series.Blue Location: Fort Worth, TX Posts: 1,781 Thanks: 88 Thanked 781 Times in 481 Posts Mentioned: 16 Post(s) Tagged: 0 Thread(s)	Crank pulley issue has been beaten to death in numerous threads... The other pulleys would be fine to install (unless they somehow hit any of the turbo components), but the factory pulleys for the accessories aren't very heavy to begin with. Consider it the cosmetic upgrade it is (unless they're underdrive pulleys, they do nothing for performance but making your wallet lighter)

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