Joined: 20 Jun 2017
|Posted: Sun Aug 27, 2017 1:53 pm Post subject:
|Right, after some work tonight I can probably actually help with this.
First off, do you have your ostrich and a wideband yet? if not proceed no further as I cannot be 100% sure the results will be the same on the 405 as the 413.
If you use the M20 injectors you absolutely have to adjust the injector latency table. It is 5x1 and contains exactly the data I posted but in raw data, change the time in MS to the raw data by dividing the time by 0.01.
You could just go looking for 5x1 tables in the code.
You need to understand the table headers to do this but if you don't understand them then you need to learn that, without knowing and understanding the table format then you will always be a bit lost in these ECUs.
You will need to adjust the injector constant and scale the tables to suit the M20 injectors or the car runs lean up top no matter what you do.
With them adjusted I found the fueling was great up top but rich at idle and low throttle.
Next thing with M20 injectors is they seem to be a little slow for the ECU. The ECU calculates the theoretical injector pulse width using the MAF and the injector constant, provided these are both right then the values in the fuel tables would be 128, for no correction to the calculated value.
However the stock maps seem to move the fueling up a little to the 130-140 range.
The M20 seems to need the fueling massively reduced at low loads, I have my low load fueling pulled down to ~95 to get to high 14s:1 when cruising or idling.
My suspicion is that the M20 injectors are an old design and do not react too well at low pulse widths. Higher up they are just fine though provided the latency is correct, the injector constant is set right and the scaling is right for the injector constant.
I am now idling at about 14.5:1, cruising at 14.6-15.2:1 and mid 12s at full throttle. Fine tuning can be started from there.
Ignition timing wise, the M20 is pretty tolerant due to a fast burn chamber for a 2v, the M50B25 timing map will run it just fine until you get to the fine tuning point.
If you need more help than this you are going to have to post your XDF and BIN so we can take a proper look. We are guessing without those two things.
Upload them to mega or file dropper and post a link.
- Edit - There is also one massive thing, do you have access to an ADS or INPA system to talk to the ECU for fault code reading and sensor checking? Again without access to this you are going to have a really bad time.
Sensor problems and errors stored in the ECU can cause hell with the tuning, you need everything working right before you will get anywhere.