PC Maps

S

sj408ryder

Active member
I recently purchased a bike with a PC V with a yoshi pipe and a 520 conversion set up. I believe it also has a custom map on the PC. On the freeway traveling at 65/70 on 5th gear, it feels like the bike's rpm is too high. I would like it to be in a lower "cruise mode." I wasnt able to find a map on the site for my set up and want to know what type of options are out there. I know that I can take it to the shop for a dyno but heard its not cheap. Any ideas?
 
ScottRNelson

ScottRNelson

Mr. Dual Sport Rider
Figure out what size your sprockets are, then find out what the stock sprocket sizes are for that bike. If they're different, go back to the stock sizes. If not, put a bigger one in front or a smaller one in back (or both).

All four of the Ducatis that I've owned had lower gearing than stock because stock gearing was just too high for every one of them. Typically I went up two or three teeth in the rear, although one needed four teeth in the rear to get the gearing that I wanted. Switching from a 15 to a 14 in front would have done something similar.

All of my KTMs have had gearing that felt right, so no changes with them. I drop the gearing on my XR650L for riding in the hills, either going up three teeth in the rear or down one in front, or both. I like the stock gearing for street use, though.
 
ST Guy

ST Guy

Well-known member
The fueling is completely separate from the gearing. As others have said. So, count the teeth on your sprockets and go from there.
 
U

usedtobefast

Well-known member
check out https://www.gearingcommander.com/

If your bike is in there, you can see stock gearing and compare to what you have. You'll probably find the previous owner geared it way down during the 520 conversion. You will need to check your front and rear sprocket for number of teeth ... normally a rear sprocket will have that stamped into the side of the sprocket, for a front you might have to actually count the teeth to see what is currently on there.


As for the PC V, you should be able to download the software for free, connect up, and read the map that is on it (using a laptop with a USB cable). It will be a table with RPMs and throttle position. These are modifications to your stock ECU tables.

So if the PC V table has a 0 in a box, that particular RPM/throttle position is not modified. If it has a 5 ... that is 5% richer than stock. A 2 is 2% richer than stock, etc. This way you can at least look at your map and see how it was modified.
 
DannoXYZ

DannoXYZ

Well-known member
That would be cool feature though. Electronically controlled sprockets that expand or contract as needed. Kinda like variable-compression engine.
 
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