919 Computer Mapping Questions... - Wrist Twisters
 
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post #1 of 22 Old 03-17-2013, 07:04 PM Thread Starter
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919 Computer Mapping Questions...

Can the stock computer be remapped to lean out the motor? Ive heard that the stock mapping is very rich..If not what alternatives are there?

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post #2 of 22 Old 03-17-2013, 07:14 PM
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Sadly, no. Your only ideal alternative is to use a Power Commander 3.

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post #3 of 22 Old 03-17-2013, 07:27 PM Thread Starter
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Does it require a custom map or do the preprogrammed ones work ok?...the bike is stock with a bafflectomy

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post #4 of 22 Old 03-17-2013, 07:30 PM
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We have an archive of maps in our dropbox that you likely could find that would work for you. However, a custom tune by someone who knows what they're doing will always yield the best results. This is manifested in much better throttle control as well as a very linear power delivery across the rpm band.

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post #5 of 22 Old 03-17-2013, 07:38 PM Thread Starter
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Is the stock map set so rich that it should be a concern to lean it? Im happy with the way it runs now. I ride alot of miles so fuel consumption would be a concern if its actually running really rich. Being from Texas which gets slightly warm in summer i dont want to lean it out much if it really isnt needed.

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post #6 of 22 Old 03-17-2013, 08:53 PM
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It's a lot more complicated than just an overall statement of "running rich" or "running lean" for the 919. In all honesty, the fueling rate, a/f mixture and throttle position % is all over the place across the rpm band. On top of that, the 919 will start adding more fuel to "richen" the mixture when the ecu detects it is operating at high temps and this can complicate things further. But overall, yes it runs pretty rich and the most noticeable indicator is the very twitch throttle response. Adjusting the throttle cables will only get you so far.

The whole point of the PC3 should be to obtain the best throttle response/linear power delivery. If you're looking for power gains, you'll be disappointed. Power gains will be a side product but they won't be anything significant.

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post #7 of 22 Old 03-18-2013, 07:58 PM Thread Starter
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Thanks for the response...great info!!!

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post #8 of 22 Old 03-19-2013, 04:51 PM
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On a somewhat related note, could someone who knows what they are doing fix the PC3 start up issue and the 919 stink?

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post #9 of 22 Old 03-19-2013, 05:51 PM
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Quote:
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On a somewhat related note, could someone who knows what they are doing fix the PC3 start up issue and the 919 stink?
The cold start issue has been addressed, and I believe fixed, on another thread.

I need to look that up myself, as I have this problem pretty readily.

Never had a problem with the stink though.

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post #10 of 22 Old 03-19-2013, 11:16 PM
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It was not fixed. Addressed? Yes. MANY times. No permanent fix, however.

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post #11 of 22 Old 03-19-2013, 11:33 PM
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Quote:
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It was not fixed. Addressed? Yes. MANY times. No permanent fix, however.
Correct on that. I have a work-around that works well for me with zero issues for a long time now, but can't seem to find anyone willing to give it a try, experiment with it and report back their results.

There's been a recent experiment with stink and replacing the FPR. Only had 1 or 2 people do it so far so we need more evidence on that as well. The stink has gotten worse for me so I'll give the FPR a whirl and report back on that in the next few months.

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post #12 of 22 Old 03-19-2013, 11:40 PM
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Quote:
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Correct on that. I have a work-around that works well for me with zero issues for a long time now, but can't seem to find anyone willing to give it a try, experiment with it and report back their results.

There's been a recent experiment with stink and replacing the FPR. Only had 1 or 2 people do it so far so we need more evidence on that as well. The stink has gotten worse for me so I'll give the FPR a whirl and report back on that in the next few months.
FPR?

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post #13 of 22 Old 03-19-2013, 11:41 PM
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Fuel Pressure Regulator.

Go to town...

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post #14 of 22 Old 03-20-2013, 12:36 AM
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Quote:
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Fuel Pressure Regulator.

Go to town...
OK that's what I thought it meant... Just couldn't understand how it would affect the sink. Found the thread. I'm going to have to think about replacing mine. I'd do anything but sell my 9er to get rid of that stink.
Thanks!

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post #15 of 22 Old 03-23-2013, 11:12 AM
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I am going to pc3 her bike to see if I can get the twichyness out of it.

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post #16 of 22 Old 03-23-2013, 12:07 PM
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Quote:
Originally Posted by Bobby View Post
I am going to pc3 her bike to see if I can get the twichyness out of it.
Bobby, it will make a WORLD of difference in smoothness, do it! I'll deal with the starting issue all day long (it doesn't happen all the time) for the benefit of control.

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post #17 of 22 Old 03-23-2013, 02:32 PM
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what is the starting issue

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post #18 of 22 Old 03-23-2013, 03:32 PM
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Never mind - did a search to find what it was

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post #19 of 22 Old 03-23-2013, 10:31 PM
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Not a deal breaker IMHO.

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post #20 of 22 Old 05-12-2013, 01:55 PM Thread Starter
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Is there any way to lean it out a bit without power commander?...aftermarket cans?...K&N filter?...i dont want to put a pc on it if i dont have to...

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post #21 of 22 Old 05-12-2013, 03:12 PM
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Quote:
Originally Posted by morgstang View Post
Is there any way to lean it out a bit without power commander?...aftermarket cans?...K&N filter?...i dont want to put a pc on it if i dont have to...
You don't HAVE TO do anything, if you're happy with the way it is.

BUT If you want it razor sharp all the way from under load as 1000 RPM through to the limiter at every map co-ordinate, can pay a PC, and will pay for a PC, then why wouldn't you get a PC?

There's a good number of members who have canned their 919s and they run fine without a PC.

K&N air filters and others like them really aren't worth debating in terms of performacne gain. I use a BMC and look at it as being a lifetime filter and nothing else but.
I had air filter comparison dyno runs done as a personal research matter.
The short story is some effect on torque stability at low revs, I mean in the 4s, but more torque at peak, and no difference at peak hp and beyond.
There is very little gain with a 919 in this regard.
My theory is that the pleated woven cotton filters do not dampen out air box pressure fluctuations as well a factory filter, which then effects what the MAP sensor sees.

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post #22 of 22 Old 05-12-2013, 04:29 PM Thread Starter
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Thanks for your reply...the reason i asked about leaning it out is since i put a fender eliminator kit on it the exhaust makes everything black on the blinkers and license plate now...im happy with the way it performs but just wanted to lean it out a bit to stop black exhaust

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