NefMoto

Hey everyone! :)

I have few questions regarding few maps with load/boost limiting...
KFLDHBN - What is turbo pressure ratio and how to convert it to pressure? (boost + ambient, in bar)
RLKRLDA - What does this map? Google translate gave me "rl threshold for slow LDR-intervention (adaptation)". What is "rl" and "SLOW (FAST?) LDR-intervention"??
KFTARX, KFTARXZK - I've set those maps to 1's. Anyone else thinks that this is really useless to limit your load based on IAT? Are there better strategies??

And KFKHFM. How can I convert it's values to % to know how much it enriches/leans AFR and that way to fix part throttle trims?

And thanks, everyone! :)

pressure ratio is typically turbo outlet/inlet pressure. There is no "easy" calculation for what you want. At minimum, you have to figure out intake drop (filter etc.) before inlet, and IC and throttle plate drop before intake manifold. You could assume all are zero. But really you should probably learn a bit more about how FI systems are designed first. Motronic does all these calculations. You could log all the appropriate values (once you've figured out what they're called and where they are).


If i had to guess, fast is throttle plate closure, slow is wastegate intervention (possibly through PID set point decrease) or direct N75 signal intervention (unlikely)


All my opinions on the matter are on the s4wiki.


Don't guess, log

(X * 0.007813 -1) * 100

i used this formula in my first me7 xdf when i made it, and it seems to work just fine..  :)

GREAT! :) Thank you very much!

Let's say for most basic formula what it would look like? (when all the smaller factors are (let's say) zeroes)

In that case, PR = boost/ambient... but that is a terrible, terrible approximation

Again, PLEASE consider buying a book about FI.....

http://s4wiki.com/wiki/Compressor_map#Pressure_Ratio

Thank you! Now I understand approximate values of my KFLDHBN map!

Ok, now another question arises... :D I know that it is annoying for you all to answer them, but I really am thankful for your patience..

I've edited KFMIRL, KFMIOP, LDRXN... well, all the standart maps. But when I was driving the other day other passat 1.8T (same setup, KO3 turbo) that was tuned by pro tuner, it had very nice habbit of boosting up to 1bar in FIRST GEAR! Now my car doesn't start to boost completely until second gear (first gear - limit at 0.5bar)... So, is there a map that prevents full boost in first gear? (aka some kind of protection or something)

Don't guess, log