AFR Spike Question

[joefromkocomo]

Jesus. So last night I was driving and giving it a little gas from 3k in 3rd gear, still on the Cobb Stage 0 which is allegedly a simulated stock map. I look down at my AP after a quick pull from 30-60 and see that the upper bound of my boost number was ~17.6 lbs. I know for damn sure a stock map should be tuned with a boost target of 15.5-15.6 lbs. I started logging so I could take a look at home to see what was going on, and sure enough I had one cell of boost spike. Shifting from 3rd to 4th, as soon as the turbo spooled in 4th it spiked to 17.68 lbs. I know the K04 is capable of 18-19 lbs safely, but if I'm 2 lbs over target that doesn't seem too great. No KR reading at all. I'm really just thinking of uninstalling the AP until it's time for tuning at this point. Am I thinking correctly, or am I just paranoid? Datalog attached.

[Vansquish]

Originally Posted by joefromkocomo Jesus. So last night I was driving and giving it a little gas from 3k in 3rd gear, still on the Cobb Stage 0 which is allegedly a simulated stock map. I look down at my AP after a quick pull from 30-60 and see that the upper bound of my boost number was ~17.6 lbs. I know for damn sure a stock map should be tuned with a boost target of 15.5-15.6 lbs. I started logging so I could take a look at home to see what was going on, and sure enough I had one cell of boost spike. Shifting from 3rd to 4th, as soon as the turbo spooled in 4th it spiked to 17.68 lbs. I know the K04 is capable of 18-19 lbs safely, but if I'm 2 lbs over target that doesn't seem too great. No KR reading at all. I'm really just thinking of uninstalling the AP until it's time for tuning at this point. Am I thinking correctly, or am I just paranoid? Datalog attached.

I wouldn't install anything just yet.

Please re-take some datalogs and include the following logging parameters (some things were missing in your log, and other unnecessary parameters were present). Note that a proper WOT datalog should be taken on a flat, smooth, straight road and it should begin just under 3000rpm and run to at least 6000rpm in a single gear (preferably 3rd or 4th).

Accelerator Pedal Position
Actual AFR
Boost (psi)
Boost Air Temp
Calculated Load
Coolant Temp
HPFP Actual Pressure
Inj. Duty Cycle
Intake Temp
Intake Valve Adv.
Knock Retard
Long Term Fuel Trims (LTFT)
MAF Voltage
MAF Airflow
RPM
Short Term Fuel Trim (STFT)
Spark Advance
Throttle Position (not throttle duty cycle)
Vehicle Speed
Wastegate Duty

[joefromkocomo]

Originally Posted by Vansquish I wouldn't install anything just yet. Please re-take some datalogs and include the following logging parameters (some things were missing in your log, and other unnecessary parameters were present). Note that a proper WOT datalog should be taken on a flat, smooth, straight road and it should begin just under 3000rpm and run to at least 6000rpm in a single gear (preferably 3rd or 4th). Accelerator Pedal Position Actual AFR Boost (psi) Boost Air Temp Calculated Load Coolant Temp HPFP Actual Pressure Inj. Duty Cycle Intake Temp Intake Valve Adv. Knock Retard Long Term Fuel Trims (LTFT) MAF Voltage MAF Airflow RPM Short Term Fuel Trim (STFT) Spark Advance Throttle Position (not throttle duty cycle) Vehicle Speed Wastegate Duty

I'll edit the logging parameters and take one either tomorrow or Saturday and post. Very clearly I still have much more research to do if I wasn't aware that stock maps are load based, which would make boost spike less of an issue. It sounds like sustained values over the boost target are the real issue.

tegxsi: I don't think what I was doing there would be considered true WOT. I wasn't on a stretch of road where I felt good really laying into it for a true WOT pull. More like I saw something I didn't like and wanted to take a quick log to see if it did it again and was something I needed to look further into. Of course this is all speculation, I'll just get a proper datalog and post again with real data instead of speculative bullshit.