Considering a Power Commander

OK this worries me. I was going for just that . The LeoVince cans with K&N and adding the Power Commander V.

Am I looking for trouble.

 

Given that the RC51 is larger doesn't is stand to reason, given your theory, it should show a greater benefit by allowing more air?

I've never heard of RC51 boys getting "MAJOR" mid-range gains from a flapper mod. Since max RPM is 10.2k, I consider mid-range 5-7K. Could you please show me some examples, because when I had mine, I didn't find that to be the case.

About the big Hayabusa air filter power gains.

From the factory, bikes must might emission requirement that make the normally operating window typically very lean. There is no emission testing requirements for full throttle operation. Manufacturers make full throttle a little richer than max power as a safety buffer for variations in fuel and air, remember there is no airflow meter and full throttle is open loop operation. It stands to reason that, yes, a high flow filter might take advantage of that buffer and you might gain a couple HP. This also makes the all ready very lean normal operating window, even leaner. Ever know anybody that mods intake and exhaust and then can't figure out why the bike runs so hot? I've seen hundreds of posts, on various forums, of people trying to "fix" their cooling system, when in their signature, they proudly list a bunch of mods that mostly make the bike run leaner...duh. How about fix the lean condition first. The highest temp I've ever seen, moving about 30 mph, is 198 degrees while going up a 4 mile 8-10% grade with was an outside temp of 103 degrees. Yes, setting at a long light, I've gotten the fan to kick on a couple times but the temp drops very quickly, no problem. I have never seen anything above 221 degrees, ever.

Since the Hayabusa is rated in the 165Hp range, 5.1HP is less than 3% increase, I would say <3% is within dyno error anyway. Given all the variables, dyno runs separated but the time it takes to change a air filter could vary by a few percent anyway, even if you didn't make any changes.

I will say, that I believe you could spend the time (and money) to tune a bike to take advantage of a performance filter using some type of fuel injection controller. Its very important that you address the entire operating range not just full throttle, or just get a PCV w/ Autotune For the most part, the filter is inside the air box and effects mostly air volume, as opposed to air velocity. Granted, there is a relationship, but because the air is already in the box, its much less about velocity.

When you start changing the size and shape of the intake and exhaust "paths" into and out of the cylinder, it effects air velocity. You may gain power somewhere but you will lose it somewhere else and no amount of tuning is going to really change that much. Now, if you're building a race bike, and you destroy power below 8k, but make big gains above 10k, you've done a good job. Now, take that race bike and try and ride it around town. It would suck, especially if the bike was designed for sport touring (VFR) in the first place, No thanks! Now if you started with a man toy, like a Hayabusa, and you're under 30 (still feeling invincible), that might be something you're willing to live with. I like the fact that my VFR runs great down to 3k RPM and never gets hot, maybe that's just me.

 

Don't sweat it. It's no big deal. Just get a custom map and your ride will run better than ever. Trust me and others who have done it, it's worth every red cent. Actually with a PCV a custom may not be needed because of the V's auto tune feature, but I can't speak to how well that works.

I love the Leo's too, but you will gain roughly 5 lbs more in torque with 2 Bros vs Leo, if it matters to you. If I where more adept with a porn generator, I would scan my dyno and post it for you but since I can't, I'll tell you that I am now getting about 58 lbs.

 

I kinda like the two bros too but Something about those Leos. Do you think there are some already available or will I have to find a dyno place etc.

 

Some of what?

 

I guess looks and sound. But am looking at remmus and 2 bros too. Nice to know that the 2 bros can provide more torque.

 

I agree with havcar. I am too inept to link my dyno chart to this post, but have a look in my photo album. It shows that a custom tune can completely eliminate that pesky power drop before VTEC engagment. But go to a tuner that knows 6th Gens. Don't settle for a substandard tune.

58 ft/lbs is pretty good!