Good work on your project and a good call to ask for help.
I can only support what you have been told.
check calibration of all sensors.
Rising or falling for crank settings.
Nullify iat, map baro and on the new firmware cold start advance and anything that can change your ign timing of fuel amount like iat and map baro until you get a good solid tune done.
The less things that make changes in the beginning the less to confuse the tuner.
There is differing opinions with ego correction so make your own choice.
What I found fascinating is the comment on MAP sensor filtering/sampling.
I am at the point where I am seeing my tune change as driving style changes.
It is much as if my lambda delay is off but it is not. I have noticed lambda delay changes as my tune gets better. Probably port velocity is changing as the tune gets better.
But there is still something that is acting as if lambda delay is off.
Could it be the map sensor filtering/sampling that is causing the tune delay response?
I will be trying different settings to find out for my self but I sure find this very interesting and if any one has found out if this is sorta true please post it.
It is very true if you can hold a steady load and rpm it tunes accurately but normal driving has many accelerator speed changes so if your load sensor is delayed from filtering/sampling could this cause tuning issues??????
I hope I am not hijacking or changing the subject here.
Very nice info.
Just a side note.
I too have a 85 subaru rx turbo. I went with a 2.2 swap and bell housing adapter.
Mine is propane turbo. 10 to 1 comp and 6 lbs boost dyno at 180 hp. Could go to 12 lb boost but it is my wifes car and it would not go over well if we broke her car from over power.
Very cool posting. Good info.
Thanks to all here.