Ways to helping the stock fueling

[Chuck35]

Is fuel cut triggered by throttle % or is there a throttle closed switch incorporated into the tp sensor?

If the latter there may be a mod here...

 

[RadioHowie]

Is fuel cut triggered by throttle % or is there a throttle closed switch incorporated into the tp sensor?

If the latter there may be a mod here...

Think about it...if the fuel was cut by a throttle closed switch, then the bike couldn't idle, because the throttle would be closed.

The "zero fuel" throttle cut is managed by the ECU, which monitors the various sensors scattered around the motor, determining when the engine is in "over-run" condition.

Of course, I COULD be wrong, to paraphrase FredW.

 

[Fred W]

Gotta be careful when you say that phrase, Howie. Certain people will take you seriously.



There is no zero throttle position switch. As RadioHowie said, the ECU determines that the engine is on over-run, and cuts the fuel, by the fact that the TPS is putting out an equivalent voltage to "throttle closed" (within a small range) at the same time as the RPMs are some margin above idle speed.

One way to fool the ECU might be to simply intentionally mis-adjust the TPS to report a ~2% throttle value when the throttle is fully closed. If you are already running a PCIII, then you could adjust the fueling down in the 2% column (and all others for that matter) to not be overly rich while idling (or over-running) and since the O2 sensor is disconnected it will never go closed loop anyway, which is one of the big reasons that the ECU wants to know when the engine is idling.

My '04 Vstrom has EFI, and it also has the Fuel Cut issue on trailing throttle. I once adjusted the idle up pretty high, so the TPS at idle was no longer in the range the ECU considers idling, and miraculously the Fuel Cut went away during decel. It still needed (and now has) a PCIII because it too exhibited the EPA caused lean surge issues, even more so than the FJR. The PCIII fixed the lean surging on that bike too, of course.

 

[willboe]

What about a different cam? I cannot find the post just now, but one of our members filed a groove into the stock cam making the initial diameter smaller, and requiring, initially, more degrees of arc to get that beginning fuel burst, thereby making a smoother, less jerky start. Apparently there is also a third party replacement for this. Do any of you guys have details regarding this?

Okay, I found the thing I was looking for. It is a 'G2 Throttle Cam". I haven't read it yet, but info is here: https://www.fjrforum.com/forum//index.php?showtopic=14983&pid=238397&st=40entry238397

 

[Fred W]

What about a different cam? I cannot find the post just now, but one of our members filed a groove into the stock cam making the initial diameter smaller, and requiring, initially, more degrees of arc to get that beginning fuel burst, thereby making a smoother, less jerky start. Apparently there is also a third party replacement for this. Do any of you guys have details regarding this?

You're talking about the G2 Ergonomics throttle tube mentioned back in post #6. This helps mostly on the early 2nd gens ('06 thru sometime in '08?) which were delivered with some sort of a funky cam profile on the throttle tubes. Bikes born either before or after that time period have normal throttle tube cams and are OK stock. And yes, some cheap industrious 2nd gen owners have shaved their own throttle cams into a shape similar to the G2.

 

[willboe]

What about a different cam? I cannot find the post just now, but one of our members filed a groove into the stock cam making the initial diameter smaller, and requiring, initially, more degrees of arc to get that beginning fuel burst, thereby making a smoother, less jerky start. Apparently there is also a third party replacement for this. Do any of you guys have details regarding this?

You're talking about the G2 Ergonomics throttle tube mentioned back in post #6. This helps mostly on the early 2nd gens ('06 thru sometime in '08?) which were delivered with some sort of a funky cam profile on the throttle tubes. Bikes born either before or after that time period have normal throttle tube cams and are OK stock. And yes, some cheap industrious 2nd gen owners have shaved their own throttle cams into a shape similar to the G2.

Got it, thanks Fred. My 2006 AE should be a good candidate for the G2. I'm finding it for sale at around $60.

 

[Nitro]

Adding a Power Commander 5 to my FJR from FuelMoto made an absolute world of difference in smootheness and completely eliminated the abrupt "on/off" switch type action of closing and opening the throttle. I really can't begin to convey the difference it made. Honestly its like a whole different bike, I have been very happy with it. :yahoo:

 

[YummYam]

What about a different cam? I cannot find the post just now, but one of our members filed a groove into the stock cam making the initial diameter smaller, and requiring, initially, more degrees of arc to get that beginning fuel burst, thereby making a smoother, less jerky start. Apparently there is also a third party replacement for this. Do any of you guys have details regarding this?

You're talking about the G2 Ergonomics throttle tube mentioned back in post #6. This helps mostly on the early 2nd gens ('06 thru sometime in '08?) which were delivered with some sort of a funky cam profile on the throttle tubes. Bikes born either before or after that time period have normal throttle tube cams and are OK stock. And yes, some cheap industrious 2nd gen owners have shaved their own throttle cams into a shape similar to the G2.

Cheap...hmmmph

How very dare you!

 

[mcatrophy]

I was looking around and other than a Power Commander, I don't see too many options.

Is there a relatively inexpensive way to smooth out the throttle response mostly on/off the throttle? I'm not looking for any HP gains, just fixing what the EPA stuck their nose into.

If you want cheap, try modifying the original throttle tube profile. Doesn't help the on/off, but when it comes "on" it's a bit more controllable.

I did to my '06. It certainly helped (but not as good as my '10).

(Click on image for larger view)



More pics here.

 

[willboe]

I was looking around and other than a Power Commander, I don't see too many options.

Is there a relatively inexpensive way to smooth out the throttle response mostly on/off the throttle? I'm not looking for any HP gains, just fixing what the EPA stuck their nose into.

If you want cheap, try modifying the original throttle tube profile. Doesn't help the on/off, but when it comes "on" it's a bit more controllable.

I did to my '06. It certainly helped (but not as good as my '10).

(Click on image for larger view)



More pics here.

Regarding your 2010: Is the difference in the ECU mapping, or does it have a different Throttle cam that might fit on a 2006? If it is the ECU mapping, Can we get our 2006 ECUs remapped?

Thanks

 

[RadioHowie]

I was looking around and other than a Power Commander, I don't see too many options.

Is there a relatively inexpensive way to smooth out the throttle response mostly on/off the throttle? I'm not looking for any HP gains, just fixing what the EPA stuck their nose into.

If you want cheap, try modifying the original throttle tube profile. Doesn't help the on/off, but when it comes "on" it's a bit more controllable.

I did to my '06. It certainly helped (but not as good as my '10).

(Click on image for larger view)

Regarding your 2010: Is the difference in the ECU mapping, or does it have a different Throttle cam that might fit on a 2006? If it is the ECU mapping, Can we get our 2006 ECUs remapped?

Thanks

It's the throttle tube. G2 Throttle Tamer. This is THE fix for the poor off-throttle conditions for 06 & 07 FJRs.

 

[Auron]

Sorry guys, I thought this thread was dead after my last post so I wasn't paying attention.

I don't even have and FJR yet I'm getting a brand new '09 AE this weekend :yahoo:

I test rode a '10 that needed some fueling help for sure but I just remembered it had some super quiet Leo pipes on it. Then I test rode an AE and felt like it would be a real handful in a walking pace construction zone. So I have already decided one of my first mods will be to fix the fueling, especially below 4K

 

[mcatrophy]

I was looking around and other than a Power Commander, I don't see too many options.

Is there a relatively inexpensive way to smooth out the throttle response mostly on/off the throttle? I'm not looking for any HP gains, just fixing what the EPA stuck their nose into.

If you want cheap, try modifying the original throttle tube profile. Doesn't help the on/off, but when it comes "on" it's a bit more controllable.

I did to my '06. It certainly helped (but not as good as my '10).

(Click on image for larger view)



More pics here.

Regarding your 2010: Is the difference in the ECU mapping, or does it have a different Throttle cam that might fit on a 2006? If it is the ECU mapping, Can we get our 2006 ECUs remapped?

Thanks

I'm not aware of any difference in the mapping. The throttle cam (at the throttle bodies) on my '10 is what I would consider "normal". For some reason, for the '06, Yamaha saw fit to put a much more aggressive profile on the cam, this is what my modification, and the "G2 Throttle Tamer" attempt to alleviate at the "wrong" end of the throttle cable.

I don't think the ECU mapping can be upgraded, even if that was worth while (which I don't think it is). Also, the '10 (well, the '08 onward) cam is only sold as part of the throttle body assembly, which would cost mega-bucks.

...

It's the throttle tube. G2 Throttle Tamer. This is THE fix for the poor off-throttle conditions for 06 & 07 FJRs.

Probably the easiest way to get an improvement, but not as cheap as mine

.

 

[mcatrophy]

Sorry guys, I thought this thread was dead after my last post so I wasn't paying attention.

I don't even have and FJR yet I'm getting a brand new '09 AE this weekend :yahoo:

I test rode a '10 that needed some fueling help for sure but I just remembered it had some super quiet Leo pipes on it. Then I test rode an AE and felt like it would be a real handful in a walking pace construction zone. So I have already decided one of my first mods will be to fix the fueling, especially below 4K

Firstly, I, and many others with an AE (AS this side of the pond) have no issue with slow speed work, do a search for low speed manoeuvres, you'll come up with a lot of advice. Really, it's just a matter of learning to control the bike a little differently from how you would with a conventional levered clutch.

I presume a PC3/5 would certainly make it easier (as it would for a conventional), but you still have to learn a different technique when you would normally choose to slip the clutch. Riding at walking pace is not a problem with the right technique.

I'd be much more concerned with punctures than control in a construction zone

.

 

[Auron]

^

Holy cow that's a pretty color bike in your avatar!

I am driving out of state to buy my '09AE that I haven't even seen yet, does it really look that good and clean and shiny with sunlight on it? :yahoo:

 

[mcatrophy]

^

Holy cow that's a pretty color bike in your avatar!

I am driving out of state to buy my '09AE that I haven't even seen yet, does it really look that good and clean and shiny with sunlight on it? :yahoo:

Wot, in my avatar?

The colour is called Storm Grey, don't think you have that option.

Some more "staged" pics here, many more in other areas of my site (but usually dirtier!).

But, whatever the colour, it's a great bike to ride; you tend not to notice its colour when you're in the saddle.

 

[SkooterG]

I was looking around and other than a Power Commander, I don't see too many options.

Is there a relatively inexpensive way to smooth out the throttle response mostly on/off the throttle? I'm not looking for any HP gains, just fixing what the EPA stuck their nose into.

If you want cheap, try modifying the original throttle tube profile. Doesn't help the on/off, but when it comes "on" it's a bit more controllable.

I did to my '06. It certainly helped (but not as good as my '10).

(Click on image for larger view)

Regarding your 2010: Is the difference in the ECU mapping, or does it have a different Throttle cam that might fit on a 2006? If it is the ECU mapping, Can we get our 2006 ECUs remapped?

Thanks

It's the throttle tube. G2 Throttle Tamer. This is THE fix for the poor off-throttle conditions for 06 & 07 FJRs.

Not necessarily. Some fixed it with only G2. Some fixed it with only PCIII. Some required BOTH of those to fix it. Though I agree that the first place I would start would be with the G2 if it were me. And as to the original question, there has been much anecdotal evidence that the FJR's fuel injection has been getting tweaked on a regular basis.

 

[RadioHowie]

It's the throttle tube. G2 Throttle Tamer. This is THE fix for the poor off-throttle conditions for 06 & 07 FJRs.

Not necessarily. Some fixed it with only G2. Some fixed it with only PCIII. Some required BOTH of those to fix it. Though I agree that the first place I would start would be with the G2 if it were me. And as to the original question, there has been much anecdotal evidence that the FJR's fuel injection has been getting tweaked on a regular basis.

Damn, but you're argumentative lately...ain't gettin' any? :rofl:

 

[Auron]

I dunno...that looks pretty darn close to the 09' AE's I've seen. Anyone else able to comment?

 

[Bustanut joker]

It's the throttle tube. G2 Throttle Tamer. This is THE fix for the poor off-throttle conditions for 06 & 07 FJRs.

Not necessarily. Some fixed it with only G2. Some fixed it with only PCIII. Some required BOTH of those to fix it. Though I agree that the first place I would start would be with the G2 if it were me. And as to the original question, there has been much anecdotal evidence that the FJR's fuel injection has been getting tweaked on a regular basis.

Damn, but you're argumentative lately...ain't gettin' any? :rofl:

Probably not, but not to worry slugdik... I'm going to give him some in 5 days :lol: