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Discussion Starter · #1 · (Edited)
I was told by a dyno specialist that (for the VN900 custom) the Dynojet Autotune module is not really needed for the PCV5 for just daily city commuting without travelling over high difference in altitude or extreme temp variations.

You thoughts on this?


Romper
 

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I would agree and disagree. Here is the thing, what temperature range to you ride in? Do you ride when its 40 degrees? Do you ride when its 90 degrees? Do you think that you need the same fuel requirements in both conditions? The answer to that question is no. Are you going to notice it less if your just putting around town? Well maybe. Low RPM fueling is one of the hardest things to manage, and putting around town will put that to the test for sure.

The difference is exactly this. With only a PC5 you make a map on a dyno (or use a map another guy made on a dyno) and your bike is tuned perfectly for that day with those conditions. The more you change your atmospheric conditions like temp, humidity, fuel quality, future modifications to your bike like exhaust, air filters etc etc, that map will get further from perfect.

With an auto tune module you set a goal. That goal is fuel ratio. Every cell of the map gets a goal. The O2 sensor reads the exhaust gasses and reports back whether the bike is above or below the goal, and the system adjusts(its a little more complicated than this but I will stop here for the purposes of this conversation). So instead of having a map that is perfect for one condition, you have a goal that will be a constantly moving target for all conditions.

I have extensive experience with the PC5 and auto tune and it is very very good once you put in the work to get it right. However, if the cobra pro was available for the bike I had my PC5 on, it would be no contest. If you haven't already purchased it, get the cobra. You wont need a dyno and your map will always be perfect. If the PC5 combo has a weakness its low RPM fueling. My experience is that some of the lower columns have to be dialed in manually to get rid of a "sensitive" throttle in the lower RPM's.

My personal opinion is that the Vulcan 900 doesn't need such a sophisticated fueling system, simply not enough power to manage to justify it. Its not high compression, and its a short stroke v-twin so its fairly forgiving. I am hopefully about to prove that opinion when I install the big three with my Cobra FI2000r here shortly.
 

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Discussion Starter · #3 · (Edited)
Thanks Darkarcher - great post!

Not yet purchased any fuel mapping tool, but thinking about it...which will need to occur at the same time i install new V&H pipes and aftermarket intake..

I was thinking about having the dyno place install the pc5 only with the aftermarket exhaust and air intake - all the same time.

If i do buy the Cobra Pro Fuel mapping tool instead, won't i still need a dyno to baseline it in the first instance?

I ride around 70km per day in city traffic and a little on the highway...

an interesting link i found -- http://www.roadstarraider.com/index.php?topic=33146.0


Romper
 

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No you do not need a dyno run with the cobra power pro for anything other than peace of mind. It sets a goal, not a tune. It works to achieve that goal at the rate of 80 times per second. You will be very happy.
 
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