power commander
- Thread starter edjo69
- Start date
Help Support Yamaha FJR Motorcycle Forum:
Looks like a a cool little feature if any of you are familiar with flatslide carbs. I installed it and set up a mild "squirt" at smaller throttle openings. I also reset my throttle positions to make sure they were spot on. Now all I need is to order the cable from Dynojet so I can update my firmware. If anyone has their PC3 USB hooked up to a computer anytime soon I would appreciate to know what firmware version you are running. thanx allot, Merry Christmas!!
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wfooshee
O, Woe is me!!
It's the same USB cable that comes with many phones and cameras, so you may already have one.
Unfortunately not. My firmware is old enough to require a special "Box" that I will have to use once, then the new firmware allows all usb firmware updating. See page 2
My link
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wfooshee
O, Woe is me!!
Wow, didn't even realize such was necessary. I've never done a firmware update, so I don't know if such is the case with mine, it might be. All I've done is load maps and calibrate the throttle. For which, of course, the USB cable is all you need.
Is there something you need that isn't in your firmware, or are you just trying to make sure it's the latest and greatest?
Is there something you need that isn't in your firmware, or are you just trying to make sure it's the latest and greatest?
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I am going to call DJ on Monday and ask them the difference in the firmware, I just downloaded the new PC3 software and it has a bunch of new features, accelerator pump, cylinder trim and a few others, I want to use the AC pump feature for sure, so I need to know if my old firmware supports the new features, if not looks like a $50 one-time-use cable is in my future so I can update it. Once updated above 1.0.0.20 it can be upgraded in the future via the usb cable. The current firmware version is 2.3.2 and mine is 1.0.0.18, so its old for sure, probably from 2005 when the PC3 was installed by the previous owner.
ionbeam
2 FUN
Once the flying pine needles, bows, ribbons and festivities calm down I will check my PCIII. I installed mine in '04 and I have installed the 'Pump in my unit. IIRC, I settled for the final settings of 85% sensitivity, 10% fuel increase and 30 engine revolutions. When I tried any fuel increase setting over 10% it was way too rich. When the throttle was pinned wide open the engine would bog a bit, then when I would roll off the throttle a tiny bit it would actually pick up and accelerate harder. With the 'Pump installed I can easily get my gas mileage down below 32 mpg with just a few short fun romps. While I did see a small ET improvement at New England Dragway with the PCIII, I believe that the 'Pump may have actually cost me some ET. While the 'Pump does provide a bit of a boost over a very small range in a narrow band it is way too rich for good performance with a stock setup. Air, give me more air and please pull the stopper out of the exhaust...
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HaulinAshe
Well-known member
I found the AccPump feature nearly useless. Like IonBeam said, there's one very small area of the performance envelope where it makes a tiny improvement. But there's a huge area where it simply wastes fuel. AP on PC-III is the best way I know to ruin any fuel mileage you have. I've long since turned it off on both my FJRs.
BkrK12
Well-known member
What Jeff said!
Ivan
Member
While I am not specifically keen on the FJR's setup, most fuel injection systems use the TPS to activate a time of high pulsewidth injection on increasing throttle position. The amount and duration depend on how quickly and how much load and how much air and such. If the stock set up didn't have an accelerator pump like feature, the engine would fall flat on its face during hard acceleration during the onrush of air through the throttle bodies. The only way I could see the need to adjust that is if someone were to mess with the tuning of the air box in a way that changed the onrush of air on initial throttle opening.
Someone correct me if I am wrong?
Someone correct me if I am wrong?
I got out for a nice ride today and while I can't be positive of the changes with the ACP feature I will say that throttle roll-on was smoother and a bit more powerful. I do have it set at a pretty low setting though. Throttle twist rate at 75%, percentage of added fuel 8% and revolutions at 15. Did not notice any perceptible fuel mileage drop, but i must admit unless on a long ride I usually don't pay attention to that. Just an FYI for those who are interested.
HaulinAshe
Well-known member
Keep up with the miles per tank. You will see a 5-10% drop.
As the weather warms up I'm also betting any noticeable improvement you see now in throttle response will go away. This time of year you could hook an extra 1/4" fuel line into each cylinder without being too lean.
Do yourself a favor and mark your calendar to purposely disable the AP feature of the PC-III in the Spring. Then try to honestly evaluate if it's really doing anything for you that remotely warrants the year-round operational costs. You may forget you have the AP feature enabled, but your wallet sure won't.
I've had the benefit of running my two FJRs back to back, with a much lighter rider on the 06 with AP enabled, versus the 07 with AP disabled. The 06 never had anything for me. In fact, mostly because it was summer weather, the 06 rider complained that the bike felt "rich" exiting corners. He had no prior knowledge of the AP feature setting. I disabled it on the road side that day.
You are probably right, certainly with the warmer weather. I will play around with it a bit more. I have a separate map for cross country trips so when using that map I will for sure disable it.
wfooshee
O, Woe is me!!
I'm in the "why bother" camp on this. The ECU recognizes throttle rate of change and squirts accordingly already. No need for an extra "pump" feature.
The reason the accelerator pump is a seperate doodad on a carb is simply that a carb has no facility for recognizing rate of change of the throttle position, other than if it changes fast enough, that squirt plunger gets shoved. Saying an injection system doesn't have one and would be improved by it is a way to get the masses to part with their dollars, and not much more, IMHO. (Although that doesn't really apply, since it's a free download.)
The reason the accelerator pump is a seperate doodad on a carb is simply that a carb has no facility for recognizing rate of change of the throttle position, other than if it changes fast enough, that squirt plunger gets shoved. Saying an injection system doesn't have one and would be improved by it is a way to get the masses to part with their dollars, and not much more, IMHO. (Although that doesn't really apply, since it's a free download.)
