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Mercury 4 stroke from 75hp to 115hp
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<blockquote data-quote="Country Dave" data-source="post: 341058" data-attributes="member: 10344"><p><em>That is not entirely true,</em></p><p><em></em></p><p><em>Most manufactures build their smaller OB on the same platform. It’s true that a lot of the HP comes from the tune. The tune being “The software” in the controller/module, not really any deferent than most modern autos. </em></p><p><em></em></p><p><em>It controls base timing, valve timing, injector on time/duration and a host of other changes at deferent RPM ranges. You can bump up the HP by remapping the controller; however it’s been my understanding that Mercury, Yamaha and others are making the HP higher from the same displacement blocks by having changes in the heads, not just different programs in the controller. </em></p><p><em></em></p><p><em>Heads with bigger valves, different combustion chambers etc. A 2010 Mer 75 HP and 115 HP may have the same displacement blocks but the majority of the HP difference is in the heads, “not just controller mapping” </em></p></blockquote><p></p>
[QUOTE="Country Dave, post: 341058, member: 10344"] [i]That is not entirely true, Most manufactures build their smaller OB on the same platform. It’s true that a lot of the HP comes from the tune. The tune being “The software” in the controller/module, not really any deferent than most modern autos. It controls base timing, valve timing, injector on time/duration and a host of other changes at deferent RPM ranges. You can bump up the HP by remapping the controller; however it’s been my understanding that Mercury, Yamaha and others are making the HP higher from the same displacement blocks by having changes in the heads, not just different programs in the controller. Heads with bigger valves, different combustion chambers etc. A 2010 Mer 75 HP and 115 HP may have the same displacement blocks but the majority of the HP difference is in the heads, “not just controller mapping” [/i] [/QUOTE]
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Mercury 4 stroke from 75hp to 115hp
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