525 efi --- How much hp will be lost?
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525 efi --- How much hp will be lost?

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    Default 600sc

    600sc
    Last edited by express; 07-16-2012 at 10:05 AM.

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    Senior Member jimclauss's Avatar
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    Quote Originally Posted by express View Post
    600sc
    what about it? Mercruiser 600 hp super charged?

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    New here Beer:30's Avatar
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    Yeah, I don't understand the - I guess - question?

    600SCi is the little brother to the 700SCi. Fuel injected, supercharged, and intercooled. Biggest advantage over normally-aspirated 525 is HP vs. DA. The 525 makes ~540hp or so AT SEA LEVEL. The boost/timing/ fuel on the 600 is constantly adjusted via the ECM for density altitude. So, you will have 600hp at sea level or 6000 feet.
    Quote Originally Posted by gn7 View Post
    EFI is the wave of the future. There can be no denying it. Electronics have been on the leading edge of our entire lives. Not only os the magneto dead, but the standard issue CDI is wavering. Its all about total fuel, air AND spark control. Anybody that thinks its not has their head up their ass.


    2001 SleekCraft 30' Heritage SSB, open-bow mid-cuddy. 496HO / Bravo-I.

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    gn7
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    Quote Originally Posted by Beer:30 View Post
    . The boost/timing/ fuel on the 600 is constantly adjusted via the ECM for density altitude. So, you will have 600hp at sea level or 6000 feet.
    So, they are throwing boost away at sea level? Or do they magically speed up the blower at altitude?

    btw, the OP's question before he edited it away was how much HP would be lost by changing the tube headers to alum manifolds. No telling why he removed it.



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    Last edited by gn7; 07-16-2012 at 09:19 PM.

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    the 600sci and 700sci have a boost valve that opens at a set boost level, on my 600sci the stock computer would open the valve at 4.5 psi now with a whipple stage two kit it opens about 8 psi
    Last edited by sport; 07-18-2012 at 02:17 PM.

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    Quote Originally Posted by gn7 View Post
    So, they are throwing boost away at sea level? Or do they magically speed up the blower at altitude?
    Newer blowers, other than the pre-historic 71 cubic-inch-per-cylinder, have bypass valves to regulate the boost. The pulley makes sure there is MORE boost than needed and then the valve bleeds it off to keep HP constant. Sorta like a waste-gate.
    Quote Originally Posted by gn7 View Post
    EFI is the wave of the future. There can be no denying it. Electronics have been on the leading edge of our entire lives. Not only os the magneto dead, but the standard issue CDI is wavering. Its all about total fuel, air AND spark control. Anybody that thinks its not has their head up their ass.


    2001 SleekCraft 30' Heritage SSB, open-bow mid-cuddy. 496HO / Bravo-I.

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