magna chargers 725HP, 755TQ 10.5:1 with 13# boost on pump gas?
10-31-2007, 06:57 PM
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magna chargers 725HP, 755TQ 10.5:1 with 13# boost on pump gas? I was browsing Magna chargers website and watched the 725HP / 755TQ 404CI ls2. I was really impressed. one of the comments during the video was that it ran 10.5:1 compression and 13#s of boost on pump gas. I'm building an LS2 so I gave them a call and they verified.......even gave me a build sheet. I was always under the assumption you couldn't you run that high of compression with a super charger. Is this safe?
11-01-2007, 01:17 AM
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The maggies run best with about 10.5:1 compression. They seem to like big cams too, which also helps running higher compression. I'm looking at putting a MS4 cam in mine this winter.
The 725 HP is flywheel HP, not RWHP.
The 725 HP is flywheel HP, not RWHP.
11-01-2007, 01:30 AM
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Centrifigul blowers makes more upper rpm HP. They work great for drag racing since you are in the upper rpm range once you launch.
11-01-2007, 06:13 AM
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The 122's are nice for smaller displacement motors. I would never build something more then a 6l for one. At 720hp I would not be runing pump fuel. At that power level with the air to water system IAT's are in the 160-200 range. I did a 5.3l, at 14psi the IAT's would be in the 160 range. I ran about 11-15 degrees of ignition advance under full boost with pump fuel on that one.
11-02-2007, 09:17 PM
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Why wouldn't you run a 122? I have a 404 LS2 I'm building for a supercharger.
The 122's are nice for smaller displacement motors. I would never build something more then a 6l for one. At 720hp I would not be runing pump fuel. At that power level with the air to water system IAT's are in the 160-200 range. I did a 5.3l, at 14psi the IAT's would be in the 160 range. I ran about 11-15 degrees of ignition advance under full boost with pump fuel on that one.
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11-03-2007, 12:21 AM
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I was browsing Magna chargers website and watched the 725HP / 755TQ 404CI ls2. I was really impressed. one of the comments during the video was that it ran 10.5:1 compression and 13#s of boost on pump gas. I'm building an LS2 so I gave them a call and they verified.......even gave me a build sheet. I was always under the assumption you couldn't you run that high of compression with a super charger. Is this safe?
Last edited by Chicago Crew UnderBoss; 11-05-2007 at 11:47 PM.
11-03-2007, 12:42 AM
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If this is the case, am i not the only one who thinks that the HP numbers are kinda low for 13psi, a big c.i. motor, and a compression ratio like that? I might be wrong, but i'd expect that to even be a little low as a RWHP number... I made 700rwhp on a conservative tune and 13psi on a 348... granted that's turbos, but wouldnt expect there to be that much of a difference in power numbers??
Maybe i'm just not thinking correctly?
Maybe i'm just not thinking correctly?
11-04-2007, 09:09 PM
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If this is the case, am i not the only one who thinks that the HP numbers are kinda low for 13psi, a big c.i. motor, and a compression ratio like that? I might be wrong, but i'd expect that to even be a little low as a RWHP number... I made 700rwhp on a conservative tune and 13psi on a 348... granted that's turbos, but wouldnt expect there to be that much of a difference in power numbers??
Maybe i'm just not thinking correctly?
Maybe i'm just not thinking correctly?
You also have to remember that the supercharger is taking at least 60 HP to drive it. Which is very liitle compared to a 8:71 GMC type of blower. They take about 400 HP to spin them.
Also, 13 psi with a Maggie isn't the same as 13 PSI with a turbo, because of the heated air. Air molucles expand with heat, and makes more pressue, but with the same amount of air molucules. It's all about how many moulcules you can cram in the cyliners, not how much PSI of air pressure you can pack in.
What the Maggies lacks on top, it makes up on the bottom. Which is why they make great street power, and not so hot for low ET drag racing.