In a post on another thread last week (linked below) I recalled that there was an anomaly in the calculation of Lambda field within Tunerstudio and hence also the logged Lambda value. This is when using Lambda Settings in Project Properties.
http://www.msextra.com/forums/viewtopic ... 45#p517695
I have been trying to get my head around a few other things recently and came across this anomaly again.
Lines 5306 & 5307 of the mainController.ini file read as follows:
Code: Select all
lambda1 = { afr1 / 14.7 }, "Lambda"
lambda2 = { afr2 / 14.7 }, "Lambda"
Right now, this has had me over on a number of logs taken during a dyno session meaning that my fuel tables have been calibrated to a different Lambda than intended.
Why is this calculation coded in this manner? Given the fact that you have the flexibility to enter the stoich ratio in General Settings, it would seem logical for TS to pull this value to use in the calculation of Lambda rather than using a coded value? My readings are only out by a few percent but this calculation makes the Lambda value useless if using E85 or Methanol fuel.
Can this calculation please be changed to use the Stoich AFR which the user inputs in General Settings?
Also related, I have been unable to find a difinitive answer in the .ini so hoping someone can confirm. It stands to reason that the controller uses AFRTarget in AFR to calculate inj PW when Incorporate AFRTarget is enabled regardless of the Project Properties Settings in TS. How is the AFR Target that the controller uses calculated when Lambda is selected in TS Project Properties? Does this also use 14.7 or does it use the user Stoichiometric AFR?
i.e. Assume I am using Lambda within TS and I have Incorporate AFRTarget enabled and a Stoichiometric AFR of 14.2 entered. If at a particular speed/load point I have entered Lambda 1.0 in the AFR Table 1, will the AFR Target that is used in the fuel calculations, "outpc.afrtgt1 = gl_afrtgt1" be 14.7 or 14.2?
For reference, I am running MS2E_3.4.2 firmware and TunerStudioMS Ultra v3.0.28.