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What makes an HP525 an HP525?

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Old 06-21-2008, 04:46 PM
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The reason I ask is that I'm considering a Powerquest 280 that has a Precision Marine 502 that has been modified to run naturally aspirated with 540hp at the crank. I believe this is equivalent to a HP525's power. The power was made with Dart high flow aluminum head, ported and polished intake manifold, high flow exhaust manifold, and a different cam. ECM tuning as well of course.

Am I basically getting an HP525? If so, WOW!
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Old 06-21-2008, 08:17 PM
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yes he is !
Approx How Much more HP with the remap????
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Old 06-21-2008, 11:04 PM
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I believe he said 30-40hp more per side, but you have to run 91 octane. He can also raise the rev limit to 5850 safely.
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Old 06-22-2008, 08:40 PM
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I believe he said 30-40hp more per side, but you have to run 91 octane. He can also raise the rev limit to 5850 safely.
Nice and definately something to consider. Thanks
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Old 06-22-2008, 09:27 PM
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525s range from 538 to 572HP i have seen on the dyno.
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Old 06-22-2008, 09:59 PM
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On the Crank or on the Prop, now I believe Merc lists them at the prop ?
A 525 makes about 500 at the prop. Most will dyno, as JC mentioned, at least 540ish hp at the crank. Been done many a time. Most loose about 10% hp once they make it to the prop via bravo. I dont think merc lists any motor at the prop b/c it doesnt tell anything. They make too many drives and motors that can be interchanged like a 525 with an XR, #6, and according to merc racing now an NXT. All those drives eat up different power.

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Old 06-22-2008, 10:24 PM
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I believe he said 30-40hp more per side, but you have to run 91 octane. He can also raise the rev limit to 5850 safely.
I wonder who else can raise the rpm?
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