WUE and ASE. Does 1 temperature mean 2 things?
Posted: Sun Mar 29, 2009 11:39 am
Hi,
I make progress in tuning the warm-up. Which is much more demanding than hotstart and enigne-running. As I do a lot of short distance driving and many cold starts please excuse me for stirring up something obvious to others. I bother about too much enrichments and dilution of oil and adverse effects like that.
Now I started with get it running when really cold (say 0°C) and then adjust the WUE bins on the way to operating temperature, doing so by keeping them as low as possible (with only one eye at AFR gauge, guiding me at being no leaner than when warm) without any signs of surging or powerless feeling.
That way I got a 20°C WUE bin of, say, 150%. Now if I do something different - I start the engine one morning when the coolant is 20°C warm already, I realize my former WUE is way too lean. And the engine will die after 2sec. One restart and it should run, but not very nice for a couple of more seconds.
!! So it seems to make a difference whether the engine is started with a certain coolant temp., or it reaching the same temperature after having run for some time.
I believe that is because the combustion chambers have been warmed up in the latter case for a while which aids evaporation or the like
>> The defaults have the ASE taper time for a certain amount of cycles, in the range of 150-300 cycles. Wouldn´t it be smart to make the WUE bins as low as possible (to avoid running unnecessarily rich while running up through the WUE bins) and on the other hand help the engine starting by prolonging the ASE taper time. That way the enrichment would only occur during the first " quarter or half a minute" of warmup.
But I always respect the default values. They have vast amount of experience behind them. Thought I asked for why things have been designed the way they are. At the moment I realize that staying close to the default ASE and trying to keep low WUE%´s does not work.
I make progress in tuning the warm-up. Which is much more demanding than hotstart and enigne-running. As I do a lot of short distance driving and many cold starts please excuse me for stirring up something obvious to others. I bother about too much enrichments and dilution of oil and adverse effects like that.
Now I started with get it running when really cold (say 0°C) and then adjust the WUE bins on the way to operating temperature, doing so by keeping them as low as possible (with only one eye at AFR gauge, guiding me at being no leaner than when warm) without any signs of surging or powerless feeling.
That way I got a 20°C WUE bin of, say, 150%. Now if I do something different - I start the engine one morning when the coolant is 20°C warm already, I realize my former WUE is way too lean. And the engine will die after 2sec. One restart and it should run, but not very nice for a couple of more seconds.
!! So it seems to make a difference whether the engine is started with a certain coolant temp., or it reaching the same temperature after having run for some time.
I believe that is because the combustion chambers have been warmed up in the latter case for a while which aids evaporation or the like
>> The defaults have the ASE taper time for a certain amount of cycles, in the range of 150-300 cycles. Wouldn´t it be smart to make the WUE bins as low as possible (to avoid running unnecessarily rich while running up through the WUE bins) and on the other hand help the engine starting by prolonging the ASE taper time. That way the enrichment would only occur during the first " quarter or half a minute" of warmup.
But I always respect the default values. They have vast amount of experience behind them. Thought I asked for why things have been designed the way they are. At the moment I realize that staying close to the default ASE and trying to keep low WUE%´s does not work.
