Add a cam or E85 conversion
Drifting
Joined: Apr 2001
Posts: 1,595
Likes: 360
Let's say an LS9 made 867whp with the stock cam at 23psi with a blower (ported 2300) ratio of 3.5....are you saying that if I changed to a well designed purpose built aftermarket cam that I'd see very little HP gain if I left the blower ratio at 3.5? What about porting the heads? Still very little gain without going with more blower speed? I don't think I care to spin this blower much faster but I do believe I've observed that many LS9 heads/cam builds make way more power than 867whp (some maybe 1000+?) while spinning a 2300 blower no faster than mine. What am I missing?
Just trying to learn here.
Just trying to learn here.
Last edited by Colonel; Sep 15, 2023 at 03:45 PM.
Burning Brakes
Joined: Mar 2019
Posts: 833
Likes: 178
From: Indianapolis Indiana area
Let's say an LS9 made 867whp with the stock cam at 23psi with a blower (ported 2300) ratio of 3.5....are you saying that if I changed to a well designed purpose built aftermarket cam that I'd see very little HP gain if I left the blower ratio at 3.5? What about porting the heads? Still very little gain without going with more blower speed? I don't think I care to spin this blower much faster but I do believe I've observed that many LS9 heads/cam builds make way more power than 867whp (some maybe 1000+?) while spinning a 2300 blower no faster than mine. What am I missing?
Just trying to learn here.
Just trying to learn here.
Safety Car
Joined: Oct 2007
Posts: 4,204
Likes: 1,074
From: South Florida
Let's say an LS9 made 867whp with the stock cam at 23psi with a blower (ported 2300) ratio of 3.5....are you saying that if I changed to a well designed purpose built aftermarket cam that I'd see very little HP gain if I left the blower ratio at 3.5? What about porting the heads? Still very little gain without going with more blower speed? I don't think I care to spin this blower much faster but I do believe I've observed that many LS9 heads/cam builds make way more power than 867whp (some maybe 1000+?) while spinning a 2300 blower no faster than mine. What am I missing?
Just trying to learn here.
Just trying to learn here.
I am not against the mods I just don't see the reward for the risk is worth the effort and expense to gain maybe 50rwhp on a 700bhp setup like they did in the video? I am also skeptical of these type of tests where so many details are hidden. I stand by the thermodynamics of it, if there is any energy returned, it is due to reduced friction, remember it takes power drive one of those blowers, maybe 80hp 100hp just to drive the thing, probably gaining 20hp just by reducing the stress on the crank pulley. Its not a *bad* mod but its performance return doesn't match the expense and risk to me. If you can find an exact setup using the exact blower drive and mods you are interested in and copy it that would be best I think.
