|
Title: Actual vs Desired Boost Stock 1.8t (stage 1) Post by: gin+ on March 08, 2017, 10:00:07 AM Hey gents! More newb questions!
I'm trying to determine if my stock 1.8t has mechanical issues or if what I'm seeing is normal behavior for a k03s. I recently increased KFLDHBN so actual boost appears to be following LDRXN but desired boost is still considerably higher than actual. I'm not sure if I should be messing with KFLDIMX at this point or really how to configure it if I wanted to. Appreciate any input! Title: Re: Actual vs Desired Boost Stock 1.8t (stage 1) Post by: gin+ on March 08, 2017, 10:06:10 AM Wastegate duty cycle and log might be helpful to a trained eye!
Title: Re: Actual vs Desired Boost Stock 1.8t (stage 1) Post by: nyet on March 08, 2017, 11:35:25 AM Yes, you need more IMX.
Log all of the PID variables. Title: Re: Actual vs Desired Boost Stock 1.8t (stage 1) Post by: gin+ on March 08, 2017, 05:34:39 PM I increased LDIMX at 850 and 1000mbar and it definitely closed up some of the gap. I used a TT225 table as sort of a reference. I guess my question now is why desired is much higher than what I have specified in LDRXN. That specifically happened after increasing LDHBN but I don't necessarily understand if "LDRXN - maximum specified load". Perhaps my math is off?
Title: Re: Actual vs Desired Boost Stock 1.8t (stage 1) Post by: nyet on March 08, 2017, 06:33:10 PM I guess my question now is why desired is much higher than what I have specified in LDRXN. Desired what? Boost or load? Quote That specifically happened after increasing LDHBN but I don't necessarily understand if "LDRXN - maximum specified load". Perhaps my math is off? What math did you use? Please read the load->boost conversion section of the tuning page. Title: Re: Actual vs Desired Boost Stock 1.8t (stage 1) Post by: gin+ on March 09, 2017, 03:30:44 AM I'm sorry, desired boost.
I used the formula from the s4wiki. My target boost at 3k is 15psi so I I specified ldrnx with a load value of 173.00 expecting (173 x 10) + 300mbar = 2030mbar but I'm seeing much higher numbers in my logs. Title: Re: Actual vs Desired Boost Stock 1.8t (stage 1) Post by: fknbrkn on March 09, 2017, 04:47:53 AM 15psi = ~150% load at mid-range
you should not touch kfldimx/drl stock values when using stock turbo / wg. if you running higher than 1100 mbar (last axis value) then rescale axis to add new value for higher boost with a new data Title: Re: Actual vs Desired Boost Stock 1.8t (stage 1) Post by: gin+ on March 09, 2017, 09:02:17 AM @nyet; Firstly, I want to thank you for your contributions in unlocking these mysteries.
I'm sorry, desired boost. I used the formula from the s4wiki. My target boost at 3k is 15psi so I I specified ldrnx with a load value of 173.00 expecting (173 x 10) + 300mbar = 2030mbar but I'm seeing much higher numbers in my logs. Maybe I'm not taking into account of this being a rough approximation considering all the factors involved in rlsol to plsol calculation. 15psi = ~150% load at mid-range you should not touch kfldimx/drl stock values when using stock turbo / wg. if you running higher than 1100 mbar (last axis value) then rescale axis to add new value for higher boost with a new data Thank you for your insight however I am a bit confused. Which table are you referencing that I rescale its axis? Title: Re: Actual vs Desired Boost Stock 1.8t (stage 1) Post by: 4ringpieces on March 09, 2017, 11:20:40 AM Kfldimx
Some people rescale, some people don't Title: Re: Actual vs Desired Boost Stock 1.8t (stage 1) Post by: gin+ on March 10, 2017, 11:29:21 AM @Fordy; Thank you!
After a ton of reading and head scratching I think I have a preliminary grasp on PID that I lacked literally two days ago. This stuff gets in deep in a hurry... |