Staintune's on my 2014 FJR1300ES

[jstewart]

Interesting thing happened when I installed my Staintune pipes on my 2014 ES. I have used the same set of Staintune pipes on all three of my FJR's (2005, 2008 & now a 2014 ES). The 2014 ES has the best fueling stock of the 3. I used a PC and dyno tuning on the earlier FJR's to get the best throttle response & power on the 2005 & 2008 FJR's both with stock pipes & with the Staintunes. After installing the Staintunes (they have the optional larger DB killer) and warming up the bike I left to meet a friend. Getting to his place was all flat interstate. The MPG with a warm motor dropped 8 to 10 MPG below normal with the Staintune pipes. By the time I got to the expressway exit (45 miles) to my friends house the MPG had returned to what was normal for the stock pipes (50 to 52 MPG). It is obvious to me that the new ECU re-adjusted the fuel curve to bring the AF/ratio back to the ECU programmed values. Power and response were also down when I started this ride but had both returned to normal along with the MPG. Yamaha has done a really good job with the gen 3 fuel injection system.

 

[Fred W]

I don't think so. The FJR ECU has never had adaptive capability, and I don't think it has it now.

But what I find the most amazing is that you somehow manage to get 50 to 52 mpg on your 3rd gen. I'm getting 44 - 45 mpg in the summer months, down to about 40 mpg now with the onset of winter blend fuels. What the heck kind'a fuel you boys runnin' down there in 'tucky?

 

[s.ga.rider]

Mine runs about your numbers. I think its sitting on 46 but thats in touring mode and taking it easy.

 

[Redfish Hunter]

Trying not to turn this into another fuel mileage comparison...

My '15 ES gets anywhere from 46 to 49 here at sea level on a committed ride but got well over 50 mpg on multiple tanks at higher elevation. The windshield height, the "T" ride mode, and a gentle throttle hand contribute to that. I can go to "S" mode and start twisting the throttle and that will drop rapidly. Running the windshield up will drop mpg rapidly.

Is it possible that the OP was using a bit of extra throttle after the installation of the Noisy Pipes? This is quite common, we want to hear our New Noisemakers and use a bit of extra fuel to create that noise that everyone loves so much. There is nothing like seeing the look of pure delight and happiness on the smiling faces of the bystanders and car drivers around us when we spin the RPMs up high and share our powerful sounds with them. They are always so grateful for our generosity!

 

[MadRussian]

I have Yoshimura pipes on mine and no other add-ons.

With cruise set at 65mph, I get over 50mpg on flat ground. (assuming it's not windy)

 

[Bill Lumberg]

I am interested in this assertion that the ECU can learn or exhibit adaptive qualities. , as I am sure McAtrophy soon will be.

 

[Fred W]

With cruise set at 65mph, I get over 50mpg on flat ground. (assuming it's not windy)

I was not aware that the cruise control would engage that low. How do you stay awake? (Just kidding, sort of...)

I've never seen anything above 45 mpg per tank on the '14. Maybe at altitude it will, but we're at pretty close to sea level here and there is no "flat ground" around.

 

[mcatrophy]

Surely, the point of this thread is that the ECU appeared to correct the different fuelling requirements of the after-market pipes, not what any particular pipes give in terms of mpg.

Simply quoting mpg figures will rapidly send this into NEPRT territory, whereas talk of the ECU learning the requirements is a new (and to some of us, interesting) discussion.

This comment from someone who has been warned more than once for going off topic.

 

[Fred W]

I do not believe the ECU learns anything.

I believe the mpg calculations were whacked out and it took a while for it to recalculate the correct mpg numbers.

If someone has evidence that the ECU is actually learning any6hing (adapting) that would be interesting.

 

[Warpdrv]

Learning or adjusting.... If the ECU detects something different with O2 sensors it can adjust the fuel air mixture to back to the right readings NO ?

 

[SkooterG]

Learning or adjusting.... If the ECU detects something different with O2 sensors it can adjust the fuel air mixture to back to the right readings NO ?

Within very limited parameters.

I too, find it difficult to buy into the OPs conclusions about the ECU, but perhaps there is more going on there than we know, though I doubt it.

 

[Fred W]

Learning or adjusting.... If the ECU detects something different with O2 sensors it can adjust the fuel air mixture to back to the right readings NO ?

That is more or less real-time operation of the closed loop fuel injection and is not the same kind of adaptation or learning that happens with OBD-2 automotive ECUs. The FJR ECU just continuously monitors and reacts to the O2 sensor voltage and alters the injection duration in response to it.

 

[jstewart]

It surprised me as much as any of you when I saw this. When I first got on the interstate and noticed the instant not cumulative MPG readout was reading 41 to 42 MPG at a steady 65 MPH (the speed limit) I put the bike in cruise. By the way I always use the sport mode. Other than one cloverleaf to change from one interstate to another I maintained a steady 65 MPH in cruise for over 40 miles. The MPG remained in the low 40's for about 25 miles and then slowly increased to the more normal for me 50 MPG when I exited the interstate. After owning 3 FJR's I am aware of how much the screen position, temperature, right wrist and wind affect my MPG's. I did not say anything about the ECU "learning". I do believe the ECU has the ability to readjust the fuel within some ECU programmed limits to bring the A/F ratio back to a program target A/F ratio based on air temperature, air density (altitude), RPM & throttle position and probably what gear you are in.

Not trying to start a fight here just making an observation of what I saw that was out of the ordinary after making an exhaust change.