Does fuel injection adjust based on oil or head temperature

[cobrajet]

On my 06 800 S2R I have notice that my gas mileage is about 15 to 20% less in cold weather. With that in mind I watched my oil temperature this morning on my 40 mile commute to work, stayed in the 130s F, only broke 140 at stops (about 32 F ambient). Could my FI still be in start-up enriched mode with the oil so cold? Curious, thanks, bill.

[Howie]

Your SR2 uses oil temperature.  At 140 you are well above starting temperature.  Blocking off the oil cooler will help in cold weather.  I use a piece of Naugahyde and black wire ties

[booger]

There is no cold-start mode on the S2R800. The FI is just not that sophisticated. You control cold start manually with the fast idle lever, just like the choke on a carbed bike. Your 15-20% less fuel economy in cold weather is due to other factors, a notable one being winter fuel provides less energy by volume therefore less economy. This is due to winter additives. Also, optimum fuel economy is only attainable at optimum operating temperature. I don't know what optimum operating temp would be for the S2R, but 130s probably isn't it. As stated you are in the range anyway, the owner's manual implies that 121ºF is suitable operating temp. You could experiment using a lighter weight of engine oil in the winter months but it most likely will not yield a significant improvement in fuel economy.

[ducatiz]

Your SR2 uses oil temperature.  At 140 you are well above starting temperature.  Blocking off the oil cooler will help in cold weather.  I use a piece of Naugahyde and black wire ties

This is a commonly used method, on diesel trucks too -- you'll see a piece of cardboard.

If you're looking for something higher tec, you can put a spigot inline at the oil hose.  it will prevent oil from going into the oil cooler and force it thru the bypass.

[greenmonster]

There is one Air temp & one Engine temp compensation table which gives more fuel at lower temps. They are not done w much love or care since Italians mainly cares for temps over +20 C.....
They usually makes engines go to rich at low temps.

[bikepilot]

Also at low temps it takes longer to warm up, oil starts out thicker and the pesky air you've gotta push through is thicker.  Pretty much all moving things require more energy to move about when its cold out.

[Howie]

There is no cold-start mode on the S2R800. The FI is just not that sophisticated. You control cold start manually with the fast idle lever, just like the choke on a carbed bike. Your 15-20% less fuel economy in cold weather is due to other factors, a notable one being winter fuel provides less energy by volume therefore less economy. This is due to winter additives. Also, optimum fuel economy is only attainable at optimum operating temperature. I don't know what optimum operating temp would be for the S2R, but 130s probably isn't it. As stated you are in the range anyway, the owner's manual implies that 121ºF is suitable operating temp. You could experiment using a lighter weight of engine oil in the winter months but it most likely will not yield a significant improvement in fuel economy.

You are correct that there is no "cold start mode" by definition, but since you are using a fast idle lever but oil and air temperature are inputs to the computer and do effect mixture strength.

[Duck-Stew]

You are correct that there is no "cold start mode" by definition, but since you are using a fast idle lever but oil and air temperature are inputs to the computer and do effect mixture strength.

And to expound on the above a touch:  The comparison between the fast-idle lever on an EFI bike and an actual choke circuit of a carburetor isn't really valid as there are many differences.

[cobrajet]

Thanks all for your input. No radio blaring allows you to contemplate such matters, oh well, on to the next one!  bill

[brad black]

they measure the temp inside the rocker area, so the temp of the oil flying around and the air in there.

there is a table of fuel mixture correction for ambient air temp, engine temp (coolant on an water cooled bike) and ambient air pressure.  so there is definitely a "cold start" mode.  there are also tables for ignition timing changes based on the same inputs, but they are not all used.  the injection system is as smart as any other.

they also run rich for a certain amount of time every time you restart them regardless of engine temp.

the fast idle lever is simply a device for holding the throttle open.  the ecu does not sense or read this, it just thinks the throttle is open.  it has no effect on any correction for ambient or engine conditions.

i logged an s2r800 on the track and it didn't get warm enough to be off the warm up correction after a 20 minute session at phillip island - i had to warm it up for about 15 minutes before the session started to keep the temp high enough for decent mixture logging.