some hints for cranking and shortly after ?
Posted: Fri Jan 30, 2009 6:28 am
Hi,
please excuse my frequent "?" - they´re just an effort to progress faster.
Now temps are low again and I want to improve the cranking. The engine cranks reliably, I always can start it. But, restless as I am, I want it to fire up without long cranking.
- the stepper position on the idle/temp - table is easy enough to determine and not perfectly but well enough set. Is there a "rule of thumb" where to put the cranking stepper position ? something like "take the lowest bin ot that table and open the stepper some further x%" ??
- the engine seems to need a lot of ASE. I read that the highest figure is usually 45%, but I am in high thirties with a handful of °C below freezing point already. I want to use as little fuel as possible all over (every drop counts today
) but apparantly I do not get away with low ASE. IS opening the stepper a tad something that has a great impact on ASE-affairs ?? Could I have masked a too rich ASE by having the stepper too much opened or could a wrongly set stepper position mix up the ASE and explain the engine´s need for much ASE ?
- Then there is the ASE taper time - how do I set it right ? Can I see in Megatune when it is still active ?
- I observe that the idle RPM after a hot start is lower than when the hot engine was running for some time. This may be caused by the hot coolant which collects upwards and give me a high coolant temp reading (78°C while the running engine has stready 72°C) while the cylinders may have cooled down. Is there any way to get an even RPM ? This is no major issue, but it can be felt because the sudden drive-off after hot start can give me a hesitation of the engine. I see no way to let the stepper act against this. (which in turn, votes for a closed loop idle ).
(edited to improve understandibility)
please excuse my frequent "?" - they´re just an effort to progress faster.
Now temps are low again and I want to improve the cranking. The engine cranks reliably, I always can start it. But, restless as I am, I want it to fire up without long cranking.
- the stepper position on the idle/temp - table is easy enough to determine and not perfectly but well enough set. Is there a "rule of thumb" where to put the cranking stepper position ? something like "take the lowest bin ot that table and open the stepper some further x%" ??
- the engine seems to need a lot of ASE. I read that the highest figure is usually 45%, but I am in high thirties with a handful of °C below freezing point already. I want to use as little fuel as possible all over (every drop counts today
) but apparantly I do not get away with low ASE. IS opening the stepper a tad something that has a great impact on ASE-affairs ?? Could I have masked a too rich ASE by having the stepper too much opened or could a wrongly set stepper position mix up the ASE and explain the engine´s need for much ASE ?- Then there is the ASE taper time - how do I set it right ? Can I see in Megatune when it is still active ?
- I observe that the idle RPM after a hot start is lower than when the hot engine was running for some time. This may be caused by the hot coolant which collects upwards and give me a high coolant temp reading (78°C while the running engine has stready 72°C) while the cylinders may have cooled down. Is there any way to get an even RPM ? This is no major issue, but it can be felt because the sudden drive-off after hot start can give me a hesitation of the engine. I see no way to let the stepper act against this. (which in turn, votes for a closed loop idle
).(edited to improve understandibility)