New to meth spray.. Do i spray more? (datalog no temp drop on 30/70 spray)

[TopherSho]

This is correct ... ideally you want your STFT to read 1 in a normal application which Meth is not but understanding how it works will give you an idea of how much meth your are spraying. If you see a reading of .95 then your car is technically pulling 5% fuel to keep the demanded AFR. Which could also be read as -5% depending on the program collecting the data... so .90 would be -10% or pulling 10% fuel to maintain AFR.... and vice versa if you are adding fuel... 1.05 would be adding 5% fuel to maintain AFR and could be interpreted as +5%...

Technically you need to account for the LTFT as well... so you add your LTFT and STFT to get an overall picture of how the car is being fueled...

LTFT of 1.03 and a short term fuel trim of .95 means that your car is technically pulling 2% fuel to achieve demanded AFR...make sense?


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Nice explanation.. thank you! 

 

[TopherSho]

Spray log #3 for G&G's and comparisons.  this run is still 30/70 WW fluid,  but i turned the screw 1 full turn counterclockwise on the analog boost switch.

if the factory setting is 9-11 psi then i'm now 7-9 .. have to sus-around the logs to see the spray onset in the fuel trims.

initial look is great,  STFT doesn't drop under .9 .. so that's better then the .8 i saw yesterday.  Spark is back again .. it wont hit 22 degrees so i think it is maxed with the current compensation tables and global spark thingamebob..