Pulley size

Slow_si · 12-03-2007, 09:42 AM

I am curious as to what the relationship of a supercharger to its "boost pulley" size is. I understand that the size determines the PSI, but is it:

a smaller pulley makes more boost?
-Or-
a smaller pulley makes less boost?

(Please note that i'm not sure that boost pulley is the correct term for the pulley.)

Also... On the comptech supercharger...

what's the deal with the two sizes of pulleys? I assume its a different boost rate, but what is it really?

blueroadster · 12-03-2007, 09:59 AM

A smaller pulley makes more boost.

Slow_si · 12-03-2007, 07:12 PM

Quote:

Originally Posted by blueroadster

A smaller pulley makes more boost.

Thanks. Now How do I + Rep...

Cuban Si · 12-03-2007, 11:01 PM

how much more boost would u get if u went from the stock 3.6" to a 3.15" or even 3" pulley size?

***COMplex*** · 12-04-2007, 01:48 AM

Not sure how to determine actual boost, but I know this:
3.6 = 4-6psi
3.3 = 7-9psi

12-03-2007, 09:42 AM	#1 (permalink)
Slow_si Senior Member Join Date: Feb 2006 Location: Lake Zurich, IL Age: 20 Posts: 1,298 iTrader: 0 / 0%	Pulley size I am curious as to what the relationship of a supercharger to its "boost pulley" size is. I understand that the size determines the PSI, but is it: a smaller pulley makes more boost? -Or- a smaller pulley makes less boost? (Please note that i'm not sure that boost pulley is the correct term for the pulley.) Also... On the comptech supercharger... what's the deal with the two sizes of pulleys? I assume its a different boost rate, but what is it really?

12-04-2007, 01:48 AM	#5 (permalink)
*COMplex* M.U.R.D.E.R Join Date: Mar 2006 Location: Denver, CO. Age: 23 Posts: 3,925 ------------------------- iTrader: 4 / 100%	Not sure how to determine actual boost, but I know this: 3.6 = 4-6psi 3.3 = 7-9psi __________________ » Supercharged 2006 Honda Civic Si Coupe » Information/Teaser Video \| ROTM \| Carbon8mag Feature!

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
R18 NST pulley kit DIY	el_ben2	Engine	153	10-02-2008 07:36 PM
Unorthodox Pulley Set for the SI...Info on Install.......	Dwn4nythng	Bolt-Ons And All-Motor	90	05-28-2008 04:19 PM
NST tuning pulley kit	rw_blaze	Forced Induction And Nitrous	56	05-26-2008 11:53 PM
UR Pulley kit on 07 Si 4 door	no_fn_trq	Do It Yourself Articles	6	12-04-2007 12:06 AM
DIY NST Idler pulley upgrade. FG2	MADDOGSI	Mechanical Problems & Technical Chat	12	11-29-2007 02:30 AM

12-03-2007, 09:59 AM	#2 (permalink)
blueroadster Senior Member Member Join Date: Aug 2006 Location: Maryland Posts: 3,573 iTrader: 7 / 100%	A smaller pulley makes more boost.

12-03-2007, 11:01 PM	#4 (permalink)
Cuban Si Senior Member Join Date: Aug 2006 Location: Melbourne, Fl Posts: 238 iTrader: 0 / 0%	how much more boost would u get if u went from the stock 3.6" to a 3.15" or even 3" pulley size?