[Z06] Boost/HP calculator?
Thread Starter
Racer
Joined: Nov 2014
Posts: 359
Likes: 62
From: Michigan
Boost/HP calculator?
Does anybody know if there is a formula or chart to find the approximate HP gain per lb. of supercharged boost in a LS 5.7L engine? I know it will be a rough estimate,I would be fine with even a rough percentage gain per lb. of boost if there is such a thing. Thanks Rich
Last edited by spitfun; Jan 13, 2017 at 08:41 AM.
Melting Slicks
Joined: Jul 2010
Posts: 3,355
Likes: 113
From: Los Angeles
A&A advertises a ~175rwhp increase with their C5 kit, which I think is at ~7psi. So, figure about 25rwhp/psi for a centrifugal supercharger. That number will be lower for a twin screw or roots blower. And no matter the design, there will be diminishing returns as you increase boost, due to heat issues (unless you add methanol injection).
These are rough numbers and general rules of thumb.
These are rough numbers and general rules of thumb.
Melting Slicks
Joined: Jul 2010
Posts: 3,355
Likes: 113
From: Los Angeles
^ That's closer to what a 2.0L Miata gains... it seems way too low for a 5.7L LS engine. Do you think it takes 10psi to add 100hp to the C5?
As another data point, Magnuson advertises ~120rwhp with 6psi on their C5 "hybrid-roots" supercharger, which comes to 20rwhp/psi.
As another data point, Magnuson advertises ~120rwhp with 6psi on their C5 "hybrid-roots" supercharger, which comes to 20rwhp/psi.
Melting Slicks
Joined: Jun 2002
Posts: 2,591
Likes: 144
From: Mobile al
^ That's closer to what a 2.0L Miata gains... it seems way too low for a 5.7L LS engine. Do you think it takes 10psi to add 100hp to the C5?
As another data point, Magnuson advertises ~120rwhp with 6psi on their C5 "hybrid-roots" supercharger, which comes to 20rwhp/psi.
As another data point, Magnuson advertises ~120rwhp with 6psi on their C5 "hybrid-roots" supercharger, which comes to 20rwhp/psi.
Safety Car
Joined: Sep 2001
Posts: 4,157
Likes: 554
From: Glenbeulah Wi
Does anybody know if there is a formula or chart to find the approximate HP gain per lb. of supercharged boost in a LS 5.7L engine? I know it will be a rough estimate,I would be fine with even a rough percentage gain per lb. of boost if there is such a thing. Thanks Rich
Thread Starter
Racer
Joined: Nov 2014
Posts: 359
Likes: 62
From: Michigan
The car makes 703 RWHP which equals about 800HP at the crank (approximately). From what I've been reading I think the boost is closer to 18-20 HP per lb.,if not my LS1 would be making about 650HP at the crank normally aspirated-that seems high,what do you guys think? Rich
Melting Slicks
Joined: Sep 2006
Posts: 2,728
Likes: 142
From: Iowa
The car makes 703 RWHP which equals about 800HP at the crank (approximately). From what I've been reading I think the boost is closer to 18-20 HP per lb.,if not my LS1 would be making about 650HP at the crank normally aspirated-that seems high,what do you guys think? Rich
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Melting Slicks
Joined: Jul 2010
Posts: 3,355
Likes: 113
From: Los Angeles
The car makes 703 RWHP which equals about 800HP at the crank (approximately). From what I've been reading I think the boost is closer to 18-20 HP per lb.,if not my LS1 would be making about 650HP at the crank normally aspirated-that seems high,what do you guys think? Rich
Also, this assumes you have a MAP sensor that can read positive pressure, which maybe isn't the case for you?Otherwise, if you know both the power and boost, you can calculate your own rule of thumb.
Last edited by skyavonee; Jan 15, 2017 at 03:13 PM.
Safety Car
Joined: Sep 2001
Posts: 4,157
Likes: 554
From: Glenbeulah Wi
The car makes 703 RWHP which equals about 800HP at the crank (approximately). From what I've been reading I think the boost is closer to 18-20 HP per lb.,if not my LS1 would be making about 650HP at the crank normally aspirated-that seems high,what do you guys think? Rich
Take base engine HP / .85 to account for supercharger loss that gives you real engine HP non boosted.
800 - Non boosted HP = differential
Differential/Boost PSI = HP per lb of boost.