Supercharger + Lightweight Crank Pulley? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Efferalgan · 09-26-2014, 03:37 PM

I am about to install my HKS V2 supercharger kit and thinking whether to keep my lightweight Go Fast Bits crank pulley or put back the stock one which is almost 2.5 times heavier? Your thoughts / experience / arguments are appreciated!

glamcem · 09-26-2014, 05:11 PM

since the supercharger will add some parasitic load/loss in the lower RPM range I would definitely leave the lighter pulley to compensate some of that loss..

I was planning to add a lighter crank pulley after I added my supercharger kit but since the Kraftwerks kit uses an adaptor that is designed for the OEM crank pulley I couldn't install an aftermarket one..I will get a lighter flywheel (probably an Exedy clutch kit) so it will be easier for blipshifts/revmatching

I am not sure about the Vortech kit though

alpax · 09-26-2014, 10:24 PM

Quote:

Originally Posted by glamcem

since the supercharger will add some parasitic load/loss in the lower RPM range I would definitely leave the lighter pulley to compensate some of that loss..

Exactly my thought!
I do feel that loss in the lower RPM range after installing JR SC kit, and hope a lightweight crank pulley would compensate that a bit.
Would be interesting to learn from those who had this experience.

J.C. · 09-26-2014, 10:37 PM

I have the full Perrin setup (LWCP + accessory pulleys) with my Innovate SC. Before adding the SC I already felt a slight improvement in throttle response with the crank pulley. IMO it wasn't worth the cost to add the other pulleys but I guess I just wanted to complete the set.

Now I'm looking into aluminum/CF driveshafts. You'll get more gains for your money with those.

zoth · 09-27-2014, 11:10 AM

Quote:

Originally Posted by glamcem

since the supercharger will add some parasitic load/loss in the lower RPM range I would definitely leave the lighter pulley to compensate some of that loss..

I was planning to add a lighter crank pulley after I added my supercharger kit but since the Kraftwerks kit uses an adaptor that is designed for the OEM crank pulley I couldn't install an aftermarket one..I will get a lighter flywheel (probably an Exedy clutch kit) so it will be easier for blipshifts/revmatching

I am not sure about the Vortech kit though

Aftermarket with our @KraftWerks SC would be great. Maybe @KraftWerks can whip us a billet crank pulley from Skunk

tahdizzle · 09-29-2014, 11:23 AM

From what I have read, light weight crank pulley + light weight flywheel = not a good idea.

One side or the other; not both. is what I was told.

*If you are considering or have done a light weight flywheel that is.

09-26-2014, 03:37 PM	#1
Efferalgan Senior Member Join Date: Sep 2012 Drives: Toyota GT 86 Location: Moscow, Russia Posts: 460 Thanks: 409 Thanked 226 Times in 135 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	Supercharger + Lightweight Crank Pulley? I am about to install my HKS V2 supercharger kit and thinking whether to keep my lightweight Go Fast Bits crank pulley or put back the stock one which is almost 2.5 times heavier? Your thoughts / experience / arguments are appreciated!

09-26-2014, 05:11 PM	#2
glamcem Senior Member Join Date: Oct 2013 Drives: 2022 BRZ Limited Location: Orange County Posts: 1,553 Thanks: 997 Thanked 607 Times in 404 Posts Mentioned: 32 Post(s) Tagged: 1 Thread(s)	since the supercharger will add some parasitic load/loss in the lower RPM range I would definitely leave the lighter pulley to compensate some of that loss.. I was planning to add a lighter crank pulley after I added my supercharger kit but since the Kraftwerks kit uses an adaptor that is designed for the OEM crank pulley I couldn't install an aftermarket one..I will get a lighter flywheel (probably an Exedy clutch kit) so it will be easier for blipshifts/revmatching I am not sure about the Vortech kit though __________________ 2022 BRZ Track Build (A New Chapter)

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09-26-2014, 10:37 PM	#4
J.C. Senior Member Join Date: Dec 2013 Drives: '13 Raven FR-S Location: Los Angeles, CA Posts: 227 Thanks: 57 Thanked 62 Times in 44 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	I have the full Perrin setup (LWCP + accessory pulleys) with my Innovate SC. Before adding the SC I already felt a slight improvement in throttle response with the crank pulley. IMO it wasn't worth the cost to add the other pulleys but I guess I just wanted to complete the set. Now I'm looking into aluminum/CF driveshafts. You'll get more gains for your money with those.

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