CAJ Innovations Forums - Fuel economy in winter

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Fuel economy in winter (Read 6367 times)

_Cliff_

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Fuel economy in winter
05/20/09 at 19:40:41

A lot of our bikes suffer from poor fuel consumption in winter. This is due to poor placement of the oil temperature sensor causing it to fool the ECU into thinking the engine is colder than it really is.
With MyECU it is possible to fix this without having to resort to the usual hacks of switches, resistors etc.
Simply go to the map and change the choke line from

#Temp C -30 -20 -10 0 10 20 25 30 40 50 60 70 80 90 100 110 125
OilT% +64.1 +53.1 +43.8 +35.2 +29.7 +18.8 +10.2 +9.4 +5.5 +0.0
to say
#Temp C -30 -20 -10 0 10 20 25 30 40 50 60 70 80 90 100 110 125
OilT% +64.1 +53.1 +43.8 +35.2 +29.7 +18.8 +10.2 +5.5 +0.0 +0.0

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Luhbo

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Re: Fuel economy in winter
Reply #1 - 05/21/09 at 05:10:51

That's good to know Wink

Nevertheless let me point out that at least I never experienced such a problem. I'm running the My15M quite frequently at temperatures between 0 and 10°C and even then the headtemperature never falls below 75°C.
Let me also say that not very many people have ever seen the head temperature of their bike, unless they own a MyEcu and an Optimiser.

Nevertheless, if you're running your bike closed loop and have a solid map for it, you can watch the applied correction factor while the engine warms up and use your findings to adjust the whole oiltemp line so that the correction factor stays constant.

Actually I'm using this line with good results:

#Temp C   -30   -20   -10     0    10    20    25    30    40    50 ....   
OilT%     +64.8 +53.9 +44.5 +35.9 +29.7 +19.5 +12.2  +8.5  +4.6  +0.0

Hubert

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greenmonster Full Member Offline Sweden Posts: 196	Re: Fuel economy in winter Reply #2 - 05/24/09 at 00:21:26 Quote: This is due to poor placement of the oil temperature sensor Guzzi related, I presume. Any pic of sensor to see if it may be an issue for other brands?
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Luhbo

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Re: Fuel economy in winter
Reply #3 - 05/24/09 at 18:36:21

There's a what I think very silly 40+ pager thread at Jaaps forum about this sensor. In fact the location and function of this sensor is not an issue and it's a very pity that this nonsense found entrance even here.
First look, the oil temperatur correction goes up to 50°C only. Now think, how often/how long do you have your bike below 50°C and then, how should this really affect fuel economy?

At 60°C is the first zero-value, can I write a zero into the next cells as well and then +5 for 110°C and +8 for 125°C?
I tried this but when I read back the map these values are set to zero again.

Hubert

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raz Senior Member Offline Guzzi 11OO Sport, My16MkV, Innovate LC-1 Posts: 373 Stockholm, Sweden Gender:	Re: Fuel economy in winter Reply #4 - 05/25/09 at 04:14:10 Luhbo wrote on 05/24/09 at 18:36:21: I tried this but when I read back the map these values are set to zero again. Tried that too with same result. On the other hand it will have no effect unless you're running open loop.
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Luhbo

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Re: Fuel economy in winter
Reply #5 - 05/25/09 at 05:14:43

That's right, yes.
It's not so much a problem, in fact I see temperatures above 100°C only while cruising the city. As soon as I have an open road the temperature quite rapidly drops below 100°C again, usually around 90.
But it could become helpfull in the Alps for instance, being two on the bike, with luggage and a lot of time in the first 3 gears keeping the TFO. At least theoretically. I'll keep an eye on that next time (hopefully soon

)
Hubert

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Pigski

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Re: Fuel economy in winter
Reply #6 - 06/01/09 at 21:18:33

Thanks Cliff,
Used the line of code you gave me to ater oil temp sttings, to which I ended up running the below

#Temp C -30 -20 -10 0 10 20 25 30 40 50 60 70 80 90 100 110 125
OilT% +64.1 +53.1 +43.8 +35.2 +29.7 +18.8 +7.5 +2.5 +0.0 +0.0

and had a marked improvement. Using an infra red temp device, polished rocker covers lose a lot of heat in cold weather at speed up through the hills and my choke was choking (Choked ???) and running rich. The differance in temp between the rocker cover and the barrel was up 25 - 30 degrees (Don't try this on too bendy roads, distraction could hurt) This was by far better than diabling the oil temp sender as discussed and using a double pole - double throw switch and a couple resistors as this still gives a reducing amount of choke automatically, not an off on affair using a manual switch.
Only other issue I have now is that 16 pin round screw type plug under the tank (some weird contact issues). Going to relace it with 2 decent 8 pin Narva plugs and that should sort out the dodgy electrics.

When life hands you lemons ...........

Grab the Salt and pass the Tequilla.

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