Max effort Si
Supporting Vendor
Joined: Apr 2012
Posts: 2,671
Likes: 369
From: Forney TX
If you worked to max it out, including overdriving the blower, you can make over 725whp.
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Offering products from A&A Superchargers, East Coast Superchargers, Mechman Alternators, Mantic clutches, RPS clutches, Kooks Headers, Lakewood, LG, Brian Tooley Racing, Comp Cams, FAST, ARP, UPP Turbo systems, Wiseco, Callies, K1, MAST Motorsports, Haltech and many more. PM me for details.
Le Mans Master
Joined: Mar 2001
Posts: 8,449
Likes: 3,936
From: Omaha
2020 Corvette of the Year Finalist (performance mods)
C4 of Year Winner (performance mods) 2019
I'm at 672RW with a 3.6 pulley, dual nozzle meth and LS7 exhaust manifolds (with gutted cats), all tuned by BLOWNBLUEZ06@RKTPerformance, so I'd definiltey agree that if you max it out you should be good for 725+RWHP. I'm seriously thinking about going back for 3.4 pulley and long tubes in the next 3-6 months to see how far I can go on this little Si with a stock LS3.
As for overdriving it, Vortech rates the max for the V3-Si as 52,000rpm:
http://www.vortechsuperchargers.com/page.php?id=30148
Here's the calculator for impeller speed:
http://www.vortechsuperchargers.com/page.php?id=33511
If you use 7.5" for the crank pulley, 3.4" for the blower pulley and 6600 for the rev limit, you get 52,411rpm, which wouldn't really be overdriving it.
As for overdriving it, Vortech rates the max for the V3-Si as 52,000rpm:
http://www.vortechsuperchargers.com/page.php?id=30148
Here's the calculator for impeller speed:
http://www.vortechsuperchargers.com/page.php?id=33511
If you use 7.5" for the crank pulley, 3.4" for the blower pulley and 6600 for the rev limit, you get 52,411rpm, which wouldn't really be overdriving it.
Melting Slicks
Joined: Oct 2007
Posts: 2,569
Likes: 170
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Melting Slicks
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Last edited by JetstreamGS; Apr 27, 2016 at 02:56 PM.
Melting Slicks
Joined: Jan 2013
Posts: 2,837
Likes: 41
From: Dallas Tejas
IMHO, it's not going to be enough. You're going to get used to 700 really quick and you're going to want to be able to go further without spending $$$ on a new head unit. It's like sizing your fuel system, go with more than you need vs. just enough. Ask people that have already tried..the Si is pretty well done at 725whp.. It's not going to make much more than that without overspinning it.