cwalker2
Registered
- Joined
- Apr 4, 2009
- Messages
- 224
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- 204
Just wanted to give a heads up to users of the PCV. Found a strange glitch. When mapping and using it like a standard PCIII (one map for all gears) all worked well. When the speedo frequency input was hooked up and learned for each gear all was good. Then I promoted the map to advanced mode for gear dependant tuning and that's when the glitch happened.
What was previously a smooth responding bike became very glitchy at 2000 to 2700 rpm. Now normally I don't spend anytime there so I'm nit picking here, but what I found was surprising. I put the bike back on the dyno for a quick check expecting to find a lean condition at 2000 - 2500 rpm. Well, I did and it appeared in all gears, but what was strange was the test results. I put the bike in third and selected the third gear map. The flaw was at 2% throttle and 2000 to 2700 rpm. I enriched it and no change. It was running around 16 to 17:1 so it was real balky. I wound up increasing fuel by 50% and zero fueling change. Didn't matter if I sent table or sent map (had that issue before - sometimes PC's need to be persuaded with a 2x4). Even with positive values in the 2% column the pulse width would shrink as the bike passed through 2 to 2.5K rpm. Had the same issue in all gears although less pronounced bucking in the higher gears. Still the same super lean issue and no control over the fact that the PC was trying to remove pulse width regardless of gear.
I observed the "% Fuel change" values and they read -25%. Hence a 4 - 5 mSec pulse width was dropping to 3 mSec as the bike reved through those cells. I went back to the basic map (same one for all gears as the original and still using the values of 5,6 and 10 in the PC Bins) and the issue went away. Happily running with values of 5, 6 and 10 in the 2000, 2250 and 2500 rpm bins at 2%. No longer experiencing a 25% fuel cut.
I contacted Dynojet and got the usual clueless response.
So, this is just a heads up to anyone who does not have access to a dyno and is using a PC-V. Going to advanced could yield an issue and throwing bigger values at it trying to enrich the lean spot may not have any affect. If you have an auto tune module hooked up and are expecting the module to come up with new values for the PC, you might chase your tail wondering why the bike still runs like poo. Fortunately I was able to observe all the goings on in real time on the dyno so I was able to catch the goofy -25% fuel change pop up out of nowhere and then disappear as quickly as it arrived (5% throttle and above worked fine as well as all other rpm bins).
I have not upgrade the firmware in my test PC-V so it may well be fixed, but the tech at Dynojet was unaware of any issues or fixes like I mentioned. I'm going to reflash this bike's PC-V with the new firmware and try again. Hopefully we can do it next week.
What was previously a smooth responding bike became very glitchy at 2000 to 2700 rpm. Now normally I don't spend anytime there so I'm nit picking here, but what I found was surprising. I put the bike back on the dyno for a quick check expecting to find a lean condition at 2000 - 2500 rpm. Well, I did and it appeared in all gears, but what was strange was the test results. I put the bike in third and selected the third gear map. The flaw was at 2% throttle and 2000 to 2700 rpm. I enriched it and no change. It was running around 16 to 17:1 so it was real balky. I wound up increasing fuel by 50% and zero fueling change. Didn't matter if I sent table or sent map (had that issue before - sometimes PC's need to be persuaded with a 2x4). Even with positive values in the 2% column the pulse width would shrink as the bike passed through 2 to 2.5K rpm. Had the same issue in all gears although less pronounced bucking in the higher gears. Still the same super lean issue and no control over the fact that the PC was trying to remove pulse width regardless of gear.
I observed the "% Fuel change" values and they read -25%. Hence a 4 - 5 mSec pulse width was dropping to 3 mSec as the bike reved through those cells. I went back to the basic map (same one for all gears as the original and still using the values of 5,6 and 10 in the PC Bins) and the issue went away. Happily running with values of 5, 6 and 10 in the 2000, 2250 and 2500 rpm bins at 2%. No longer experiencing a 25% fuel cut.
I contacted Dynojet and got the usual clueless response.
So, this is just a heads up to anyone who does not have access to a dyno and is using a PC-V. Going to advanced could yield an issue and throwing bigger values at it trying to enrich the lean spot may not have any affect. If you have an auto tune module hooked up and are expecting the module to come up with new values for the PC, you might chase your tail wondering why the bike still runs like poo. Fortunately I was able to observe all the goings on in real time on the dyno so I was able to catch the goofy -25% fuel change pop up out of nowhere and then disappear as quickly as it arrived (5% throttle and above worked fine as well as all other rpm bins).
I have not upgrade the firmware in my test PC-V so it may well be fixed, but the tech at Dynojet was unaware of any issues or fixes like I mentioned. I'm going to reflash this bike's PC-V with the new firmware and try again. Hopefully we can do it next week.
