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FJR Motorcycle Forums
FJR Parts & Accessories Discussions
Planning a few modifications -- advice & suggestions, please
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<blockquote data-quote="Fred W" data-source="post: 1032282" data-attributes="member: 3828"><p>You are correct, the Holeshot header has no O2 bung in it, therefore, unless you have one custom installed, 1) you can't use the stock O2 sensor even if you wanted to (which you shouldn't anyway) and 2) you also can't use a PCV autotune since the wideband O2 sensor for that screws into the O2 bung.</p><p></p><p>I put a holeshot header on my '05 and after about 6 months decided to pull it off and went back to the stock header. It definitely pushed the torque curve up in RPM and I decided I missed the low rpm torque too much. The softening of the bottom end grunt is due to the larger diameter of the header tubes. An alternate mod that you may like better is to have the cats removed from the stock header. You'll retain the stock low end torque, but pick up some HP via the reduced back pressure of no cats. And you'll also be able to run the autotune.</p><p></p><p>And, although there are many opinions to the contrary, I disagree about needing to rev the engine way up high all the time. This is a pretty large displacement engine, with a relatively low rpm power peak and red line. It has plenty of power to be ridden in the 3k-5k rpm range when cruising around. It is certainly not lugging the engine to do that. I'd say running below 3k rpm would be when you are lugging it. The torque reaches its maximum at 4250 rpm and is pretty much flat from 4250 to 8000 rpm after which it (and horsepower) falls off. The engine is perfectly happy running <em>anywhere </em>in that range.</p><p></p><p>There's no <em>need</em> to rev it up high unless you are trying to get somewhere in a real hurry. <img src="https://www.fjrforum.com/forum//public/style_emoticons/default/wink.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="Fred W, post: 1032282, member: 3828"] You are correct, the Holeshot header has no O2 bung in it, therefore, unless you have one custom installed, 1) you can't use the stock O2 sensor even if you wanted to (which you shouldn't anyway) and 2) you also can't use a PCV autotune since the wideband O2 sensor for that screws into the O2 bung. I put a holeshot header on my '05 and after about 6 months decided to pull it off and went back to the stock header. It definitely pushed the torque curve up in RPM and I decided I missed the low rpm torque too much. The softening of the bottom end grunt is due to the larger diameter of the header tubes. An alternate mod that you may like better is to have the cats removed from the stock header. You'll retain the stock low end torque, but pick up some HP via the reduced back pressure of no cats. And you'll also be able to run the autotune. And, although there are many opinions to the contrary, I disagree about needing to rev the engine way up high all the time. This is a pretty large displacement engine, with a relatively low rpm power peak and red line. It has plenty of power to be ridden in the 3k-5k rpm range when cruising around. It is certainly not lugging the engine to do that. I'd say running below 3k rpm would be when you are lugging it. The torque reaches its maximum at 4250 rpm and is pretty much flat from 4250 to 8000 rpm after which it (and horsepower) falls off. The engine is perfectly happy running [I]anywhere [/I]in that range. There's no [I]need[/I] to rev it up high unless you are trying to get somewhere in a real hurry. [IMG]https://www.fjrforum.com/forum//public/style_emoticons/default/wink.png[/IMG] [/QUOTE]
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FJR Parts & Accessories Discussions
Planning a few modifications -- advice & suggestions, please
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