High Boost Pulley or Not? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Deep Six · 07-22-2016, 07:49 AM

Currently having a new motor built for the FRS and I'm not sure whether I should put the standard pulley back on. The build includes a fresh block, forged internals, 11.5:1 CR along with the heads getting P&P and aftermarket valve train components. The goal is to reliably raise the redline to 8K although I really won't actually be shifting that high very often. The car is now going to be primarily TT and HPDE driven with occasional street use in between. My concern with the high boost pulley is the 7500 rpm ceiling that it places on the supercharger.

I suppose if it does wear out prematurely I could always replace it with a C38?

xsnapshot · 07-22-2016, 10:15 AM

You'll be hitting over 100% capacity on the blower before 8,000 RPM. Now would that realistically be a problem if you rarely ever get that high (and when you do it would only be for a split second)? Probably not. But I doubt Jackson Racing will warranty it. IIRC it maxes at 100% @ 7700 RPM. CSG could chime in on that.

I would definitely keep the high boost pulley though as you may as well take advantage of the extra power now that you have the built block.

JDMChris · 07-22-2016, 11:06 AM

Why are you lowering the compression? You will see more of a benefit if you leave it.

CSG Mike · 07-22-2016, 11:11 AM

If you use the high boost pulley, drop your redline appropriately. If you like having the 8k redline, don't use the high boost pulley.

Deep Six · 07-22-2016, 01:24 PM

I have had an 8K limiter in third and fourth gear since I had the na E85 tune. Just to be able to hold a specific gear in certain turns. Haven't tracked the car with a supercharger yet and I assume gear selection is going to be reevaluated anyway with the new power curve. Probably going to leave the high boost pulley on and just have the limiter set to 7500.

07-22-2016, 07:49 AM	#1
Deep Six Senior Member Join Date: May 2013 Drives: 2013 FRS / 2013 427 Vert Location: Orlando Posts: 611 Thanks: 212 Thanked 328 Times in 197 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	High Boost Pulley or Not? Currently having a new motor built for the FRS and I'm not sure whether I should put the standard pulley back on. The build includes a fresh block, forged internals, 11.5:1 CR along with the heads getting P&P and aftermarket valve train components. The goal is to reliably raise the redline to 8K although I really won't actually be shifting that high very often. The car is now going to be primarily TT and HPDE driven with occasional street use in between. My concern with the high boost pulley is the 7500 rpm ceiling that it places on the supercharger. I suppose if it does wear out prematurely I could always replace it with a C38? __________________ [SIGPIC][/SIGPIC] 2013 FR-S Asphalt BC Coils/Rev Works UEL header/HKS Front Pipe/Racing Brake BBK/Shorai LW Battery/ACT 6 Puck Clutch/FBM Radiator & Oil Pan/JR Oil Cooler/Jackson Racing High Boost C30/Rev Works Built Motor 2016 Audi TTS APR Tuned

07-22-2016, 01:24 PM	#5
Deep Six Senior Member Join Date: May 2013 Drives: 2013 FRS / 2013 427 Vert Location: Orlando Posts: 611 Thanks: 212 Thanked 328 Times in 197 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	I have had an 8K limiter in third and fourth gear since I had the na E85 tune. Just to be able to hold a specific gear in certain turns. Haven't tracked the car with a supercharger yet and I assume gear selection is going to be reevaluated anyway with the new power curve. Probably going to leave the high boost pulley on and just have the limiter set to 7500. __________________ [SIGPIC][/SIGPIC] 2013 FR-S Asphalt BC Coils/Rev Works UEL header/HKS Front Pipe/Racing Brake BBK/Shorai LW Battery/ACT 6 Puck Clutch/FBM Radiator & Oil Pan/JR Oil Cooler/Jackson Racing High Boost C30/Rev Works Built Motor 2016 Audi TTS APR Tuned

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07-22-2016, 10:15 AM	#2
xsnapshot Fast enough Join Date: Jun 2013 Drives: 2013 Subaru BRZ AT Location: nashville Posts: 175 Thanks: 11 Thanked 56 Times in 38 Posts Mentioned: 3 Post(s) Tagged: 2 Thread(s)	You'll be hitting over 100% capacity on the blower before 8,000 RPM. Now would that realistically be a problem if you rarely ever get that high (and when you do it would only be for a split second)? Probably not. But I doubt Jackson Racing will warranty it. IIRC it maxes at 100% @ 7700 RPM. CSG could chime in on that. I would definitely keep the high boost pulley though as you may as well take advantage of the extra power now that you have the built block.

07-22-2016, 11:06 AM	#3
JDMChris Senior Member Join Date: Oct 2013 Drives: 2016 Location: Riverside, CA Posts: 275 Thanks: 51 Thanked 119 Times in 87 Posts Mentioned: 6 Post(s) Tagged: 2 Thread(s)	Why are you lowering the compression? You will see more of a benefit if you leave it.

07-22-2016, 11:11 AM	#4
CSG Mike Join Date: Jul 2012 Drives: S2000 CR Location: Orange County Posts: 14,531 Thanks: 8,920 Thanked 14,177 Times in 6,835 Posts Mentioned: 966 Post(s) Tagged: 14 Thread(s)	If you use the high boost pulley, drop your redline appropriately. If you like having the 8k redline, don't use the high boost pulley.

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