pulley size for Rotrex - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

puma · 05-28-2014, 07:01 PM

What boost are the Jacson Racing and Kraftwerks supercharger kit ? Do they offer different pulley sizes, i can't find anything about this except for the Vortech kit.

I know this is a weird question but the thing is i want to run LESS boost, don't ask why, i just need to make less power than what the kit makes out of the box.

So, any pulley change can be done, are they available for sale with a different belt?

thanks

Freeman · 05-28-2014, 07:02 PM

Screw it I'm asking.... Why?

puma · 05-28-2014, 08:55 PM

lol, building a race car and we are limited on the amount of horsepower we can run, NA doesn't make enough power to be competitive but every FI there is is giving too much for our rules. Only the Vortech i can find a pulley to run 6 PSI.

Freeman · 05-28-2014, 09:15 PM

Interesting. What are the Whp limitations?

D K · 05-28-2014, 09:18 PM

You can always run a restrictor plate if you need to cut top end power...

Is it a hp/lb class? If so, you might be able to play with weights a little bit

CSG Mike · 05-29-2014, 02:54 AM

110mm is the diameter on the JR kit.

Have you considered lowering your redline instead? You can always run a different final drive as well, to get your powerband in the RPMS you need it in.

puma · 05-29-2014, 09:06 AM

yes it is a hp/lbs rule, we intend on running the car at a really low weight. Also, the thing is that the rule might change from one year to another, we might need to remove 20hp for the next year so either that or we need to had like 240lbs...

I guess i'll have to play with timing, i just thought it was nice from Vortech to be able to swap pulley to get a lower boost or higher boost when needed.

King Tut · 05-29-2014, 12:17 PM

Area under the curve my friend. That is all I am going to say.

KraftWerks · 05-29-2014, 01:57 PM

@puma, due to our kit utilizing a divorced belt system, we can send our kit with a larger pulley and less boost OR a smaller pulley for more boost. As @CSG Mike stated, you can also lower the redline to limit boost/power.

D K · 05-29-2014, 02:47 PM

Quote:

Originally Posted by King Tut

Area under the curve my friend. That is all I am going to say.

aint that the thruth

NonStopTuning · 06-12-2014, 04:40 PM

Quote:

Originally Posted by puma

What boost are the Jacson Racing and Kraftwerks supercharger kit ? Do they offer different pulley sizes, i can't find anything about this except for the Vortech kit.

I know this is a weird question but the thing is i want to run LESS boost, don't ask why, i just need to make less power than what the kit makes out of the box.

So, any pulley change can be done, are they available for sale with a different belt?

thanks

You can always send any pulley to NonStopTuning and have a variety of custom sizes machined to your specs.

King Tut · 06-12-2014, 05:05 PM

Quote:

Originally Posted by NonStopTuning

You can always send any pulley to NonStopTuning and have a variety of custom sizes machined to your specs.

Wouldn't you have to stop tuning to machine it to their specs?

CSG David · 06-12-2014, 05:13 PM

Quote:

Originally Posted by NonStopTuning

You can always send any pulley to NonStopTuning and have a variety of custom sizes machined to your specs.

How do you machine a smaller pulley to become a larger pulley?

NonStopTuning · 06-12-2014, 05:41 PM

NonStopTuning has offered custom pulleys, in various sizes, since 2005. You send us your pulley, we pull measurements, and build you a custom pulley in any size and/or pattern your project requires.

05-28-2014, 07:01 PM	#1
puma crew chief Join Date: Mar 2014 Drives: Race car FR-S Location: Quebec Posts: 378 Thanks: 6 Thanked 189 Times in 82 Posts Mentioned: 14 Post(s) Tagged: 0 Thread(s)	pulley size for Rotrex What boost are the Jacson Racing and Kraftwerks supercharger kit ? Do they offer different pulley sizes, i can't find anything about this except for the Vortech kit. I know this is a weird question but the thing is i want to run LESS boost, don't ask why, i just need to make less power than what the kit makes out of the box. So, any pulley change can be done, are they available for sale with a different belt? thanks

05-29-2014, 12:17 PM	#8
King Tut NASA SpecE30 Racer Join Date: May 2012 Drives: 2006 Honda S2000 Location: Gulf Breeze, FL Posts: 7,279 Thanks: 607 Thanked 5,759 Times in 3,055 Posts Mentioned: 274 Post(s) Tagged: 10 Thread(s)	Area under the curve my friend. That is all I am going to say. __________________ - King Tut Street/Track Car: 2006 Honda S2000 TT3 \|\| Race Car: 1987 BMW 325is SpecE30 \|\| Tow Vehicle: 2014 RAM 1500 EcoDiesel Sold Cars: 2012 BMW M3 \|\| 2013 Subaru BRZ \|\| 2012 Porsche Cayman R \|\| 2009 Chevrolet Z06 \|\| 2009 BMW M3 \|\| 2004 BMW M3 \|\| 2004 Nissan 350Z

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Vortech 2.87 pulley belt size?	draggin_az	Forced Induction	0	03-31-2014 09:02 PM
Anyone know what belt size to use for a 3.125 pulley on the Vortech System?	tg_1981	Forced Induction	17	08-16-2013 10:50 AM
ROTREX SC Brainstorming	MANDALAY	Forced Induction	61	12-11-2012 06:57 PM
Rotrex kit - why no build?	MindtheGap	Engine, Exhaust, Transmission	5	10-26-2012 08:01 PM
NEOPLOT Crank pulley Alternator pulley& Waterpump pulley	ANREX	Engine, Exhaust, Transmission	10	10-25-2012 08:45 PM

05-28-2014, 08:55 PM	#3
puma crew chief Join Date: Mar 2014 Drives: Race car FR-S Location: Quebec Posts: 378 Thanks: 6 Thanked 189 Times in 82 Posts Mentioned: 14 Post(s) Tagged: 0 Thread(s)	lol, building a race car and we are limited on the amount of horsepower we can run, NA doesn't make enough power to be competitive but every FI there is is giving too much for our rules. Only the Vortech i can find a pulley to run 6 PSI.

05-28-2014, 09:18 PM	#5
D K Stig's dark passenger Join Date: Dec 2013 Drives: FR-S Location: I work abroad Posts: 724 Thanks: 60 Thanked 316 Times in 186 Posts Mentioned: 20 Post(s) Tagged: 1 Thread(s)	You can always run a restrictor plate if you need to cut top end power... Is it a hp/lb class? If so, you might be able to play with weights a little bit

05-29-2014, 02:54 AM	#6
CSG Mike Join Date: Jul 2012 Drives: S2000 CR Location: Orange County Posts: 14,562 Thanks: 8,942 Thanked 14,211 Times in 6,854 Posts Mentioned: 970 Post(s) Tagged: 14 Thread(s)	110mm is the diameter on the JR kit. Have you considered lowering your redline instead? You can always run a different final drive as well, to get your powerband in the RPMS you need it in.

05-29-2014, 09:06 AM	#7
puma crew chief Join Date: Mar 2014 Drives: Race car FR-S Location: Quebec Posts: 378 Thanks: 6 Thanked 189 Times in 82 Posts Mentioned: 14 Post(s) Tagged: 0 Thread(s)	yes it is a hp/lbs rule, we intend on running the car at a really low weight. Also, the thing is that the rule might change from one year to another, we might need to remove 20hp for the next year so either that or we need to had like 240lbs... I guess i'll have to play with timing, i just thought it was nice from Vortech to be able to swap pulley to get a lower boost or higher boost when needed.

05-29-2014, 01:57 PM	#9
KraftWerks Senior Member Join Date: May 2013 Drives: Kraftwerks BRZ Location: SoCal Posts: 325 Thanks: 165 Thanked 327 Times in 166 Posts Mentioned: 138 Post(s) Tagged: 1 Thread(s)	@puma, due to our kit utilizing a divorced belt system, we can send our kit with a larger pulley and less boost OR a smaller pulley for more boost. As @CSG Mike stated, you can also lower the redline to limit boost/power.

06-12-2014, 05:41 PM	#14
NonStopTuning Senior Member Join Date: Oct 2009 Drives: AE86 Location: CA TX USA Posts: 385 Thanks: 168 Thanked 149 Times in 99 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	NonStopTuning has offered custom pulleys, in various sizes, since 2005. You send us your pulley, we pull measurements, and build you a custom pulley in any size and/or pattern your project requires.

User Name		Remember Me?
Password