Centri Blower Step Up Ratio's
Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 3,426
Likes: 0
From: Toronto Ontario
Centri Blower Step Up Ratio's
I am on a quest to find the ultimate street application which utilizes a Centri Blower Head Unit.
My goal is to achieve approx 750rwhp @ 15 PSI for street use. I plan to have the option to pully the blower application above 900rwhp in the future. This system will be run with a Flip Drive, 8 or 10 Rib pully system and 8" Innovative Balancer.
Centri Head Unit Options :
1: Procharger F1A (4.25 Pully) 5.4 Step Up Ratio
2: Novi 2000 (3.25 Pully)
3: Vortech YSi (3.12 Pully)
Questions :
What are the step up ratios of the Vortech YSI & Novi 2000 ?
What boost levels can I expect with these pully sizes ?
Will anyone want to race me ?
My goal is to achieve approx 750rwhp @ 15 PSI for street use. I plan to have the option to pully the blower application above 900rwhp in the future. This system will be run with a Flip Drive, 8 or 10 Rib pully system and 8" Innovative Balancer.
Centri Head Unit Options :
1: Procharger F1A (4.25 Pully) 5.4 Step Up Ratio
2: Novi 2000 (3.25 Pully)
3: Vortech YSi (3.12 Pully)
Questions :
What are the step up ratios of the Vortech YSI & Novi 2000 ?
What boost levels can I expect with these pully sizes ?
Will anyone want to race me ?
Former Vendor
Joined: Jul 2010
Posts: 4,504
Likes: 4
From: Waterloo Ontario
Novi 2000 is a 3.54, Novi 2500 is 3.5
YSi is a 3.45, V27 gearbox is a 4.21
And yeah, I'll race you anytime
Effecient motor = less boost = more power.
YSi is a 3.45, V27 gearbox is a 4.21
And yeah, I'll race you anytime
Effecient motor = less boost = more power.
Last edited by Arun@CCP; Jan 22, 2011 at 06:59 PM.
Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 3,426
Likes: 0
From: Toronto Ontario
How can I calculate impeller speed ?
Can you also give me an idea of boost levels I can expect in contrast with pully sizes ?
Procharger f1a 4", 4.25", 4.5"
Vortech YSI 3", 3.12", 3.33"
I know the Novi puts down approx 20psi with 2.75 pully, 17-18psi with a 3" Pully, so I would expect 15psi out of the 3.25 pully.
Former Vendor
Joined: Jul 2010
Posts: 4,504
Likes: 4
From: Waterloo Ontario
impeller speed:
Crank pulley diameter/blower pulley diameter X stepup X RPM
Some blowers like to be spun past peak, some don't, some will make boost, some will only make heat.
Boost level is too hard to determine, too many factors, but every .25 in pulley size is usually 1.5 to 2 psi.
Again boost is just a restriction-try to make the most power with the least amount of boost and your motor will last a long time.
Going on my 5th season with my 402.
Crank pulley diameter/blower pulley diameter X stepup X RPM
Some blowers like to be spun past peak, some don't, some will make boost, some will only make heat.
Boost level is too hard to determine, too many factors, but every .25 in pulley size is usually 1.5 to 2 psi.
Again boost is just a restriction-try to make the most power with the least amount of boost and your motor will last a long time.
Going on my 5th season with my 402.
Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 3,426
Likes: 0
From: Toronto Ontario
I hope some of the guys will chime in with what pully sizes they use and what boost levels they are at in combination with a flip drive and 8" balancer.
I understand that cubic inch and cam size will effect the end result, but it would be a good start.
I understand that cubic inch and cam size will effect the end result, but it would be a good start.
Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 3,426
Likes: 0
From: Toronto Ontario
Procharger was nice enough to give us an idea of what you can expect out of each head unit. I like how they give you the step up ratio and max impeller speed ... this info helps
Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 3,426
Likes: 0
From: Toronto Ontario
Ok, I did some calculations based on what I believe will achieve 15 psi at 7000rpm ...
Vortech YSi 3.33 Pully = 58,000 RPM
Novi 2000 3.25 Pully = 61,000 RPM
Procharger F1A 4.25 Pully = 71,000 RPM
Vortech YSi 3.33 Pully = 58,000 RPM
Novi 2000 3.25 Pully = 61,000 RPM
Procharger F1A 4.25 Pully = 71,000 RPM
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
5 Best & 5 Worst Corvette Daily Drivers
Joe Kucinski
The Headlights of Every Corvette Generation Explained
Joe Kucinski
5 Best & 5 Most Overrated Corvette Track Packages of All Time!
Joe Kucinski
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 3,426
Likes: 0
From: Toronto Ontario
Safety Car
Joined: Mar 1999
Posts: 3,613
Likes: 182
From: Toronto, Canada
Anyone of the blowers you mentioned can acheive 900-1000rwhp! Now wether you make 750rwhp on 15psi who cares. As long as the motor is built right and the tune is in check, just let her rip!
Former Vendor
Joined: Jun 2002
Posts: 2,045
Likes: 3
From: Bridgewater Ma
Melting Slicks
Joined: Feb 2006
Posts: 2,184
Likes: 2
LMAO
Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 3,426
Likes: 0
From: Toronto Ontario
Safety Car
Joined: Apr 2003
Posts: 4,251
Likes: 7
From: Woodbridge Ontario
Melting Slicks
Joined: Jul 2007
Posts: 2,087
Likes: 11
From: Austin TX
Not sure what motor is in your car but check out my build thread. I have a built 402 and made 750+rwhp on 14# of boost on my novi 2k. This is with a cam made for a 346 and AFR 205 heads. Swapping those two, keeping boost constant, should bump power up significantly
