I am continuing to learn about using DSMlink V2 as a tuning tool. I have used advice and information to obtain satisfactory adjustments for my WOT driving. Even though I have progressively made adjustments to limit knock, as well as better match my AFRatioEst and WB02 readings while also matching my BoostEST to my boost gauge, I now have WB02 (LC1WB) readings lower than I hoped to achieve at WOT. My WB02 range at WOT is 10.2:1 to 10.5:1, yet I hoped to achieve matching the mentioned values while getting target WB02 readings around 11:1 to 11.2:1 at WOT. Is there something that can be adjusted that would not make it nearly impossible to obtain similar matching of the WB02 and boost gauge values at WOT? With my limited knowledge, whenever I change any of my present settings, whether it involves Global Fuel, or MAF Compensations, the result is detrimental to my idle characteristics, or my matched estimates during WOT. I have never changed my Fuel Adjustment sliders because I have read it would not be advised to adjust both the MAF sliders and the Fuel sliders while tuning. Am I missing some “trick,” or misunderstanding the effective use of all the sliders?

Thanks for any advice.
Jim

I don't see a MAP sensor logged. Do you have one? It makes life a lot easier for calibrating your airflow when your WOT.

What boost are you running? According to your log you're running somewhere 24 psi judging by your airflow and boost est at around 5500rpm. It will be easier if you turn it down to 18psi or so and start from there. If your at a different boost level then you have a airflow metering problem.

When you're adjusting your mafcomp settings it should only be at the upper MAF readings your seeing at WOT so it shouldn't affect your daily driving.

Do you have a cruise and idle log? If so that would be helpful just to make sure everything is in order there.

your AFR and Wideband dont match.... the proper way to get those closer is to zero out your mafcomp, and add more fuel globally , but then you will need to re-tune your idle and cruise. Once the AFR and Widband are similar at WOT then you can target your AFR in the DA tables, then tweek/calibrate airflow if there is still any minor deviation between AFR and wideband... you dont have a MAP sensor so I dont know if BoostEst is the same as actual boost.

Xit40 said:

I don't see a MAP sensor logged.
What boost are you running?
Do you have a cruise and idle log? If so that would be helpful just to make sure everything is in order there.

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Thanks for the information. I do not have a MAP sensor that is logged (I only have the 2g OEM sensor). Plus, I only have DSMlink V2. My boost gauge holds steady at approximately 26 psi during a WOT run (my PW39 wastegate's spring combination presently accounts for approximately 26 psi). I should have worded my inquiry better, because I figured that the higher Hz MAF sliders lacked an affect on my idle. The idle effects were due to any adjustments in my Global Fuel. Whereas, any MAF adjustments affected my estimates. Similarly, I should have explained that while making adjustments "progressively," I began at 16 psi, continued at 20 psi, and reached my current 26 psi regarding boost levels. Since the changes involved wastegate spring changes, I hope that I do not need to go backwards to achieve a desired target AFR. Here are logs from the same day (yesterday) depicting my idle, and a 20 minute drive including a brief WOT up a slight hill (I did not keep it at 100% throttle because of the hill's crest creating uncertainty of what could be beyond it).
Jim

Everything seems to be in order with your idle and cruise log as far as I can tell. Your fuel trims are good and your AFR's match up pretty well. If you can when you're tuning for WOT try to get a log going wide open from 2000 rpm til redline. I'm guessing from the fuel settings you have PTE 880's in the car?

If you just want to lean out you're afr's for WOT I would just start pulling fuel on the rpm fuel sliders until your happy with it. The stock ecu is crazy rich when your in boost and are WOT so pulling fuel there is normal.

Just a question when you had the lower wastegate springs in did you try to calibrate you boostest curve at all? Yours seems pretty decent since it peaks at about 5500 rpm and it generally right around the 26 psi you state you were running. If you wanted everything super accurate you could follow JeffGST's boostest calibration page here. That would require putting the other wastegate springs back in for various MAF Hz points but it's not totally necessary. You could just calibrate it with the 26 psi spring.

If you can get a full run from 2000 rpm til redline that would be great. Also you MAFRaw is getting up there. It should be fine if you don't plan on boosting anymore than 26psi, but you may want to consider clamping it if you get any weirdness in the upper rpm range.

DSMer541 said:

... the proper way to get those closer is to zero out your mafcomp, and add more fuel globally, but then you will need to re-tune your idle and cruise. Once the AFR and Wideband are similar at WOT, then you can target your AFR in the DA tables, then tweek/calibrate airflow if there is still any minor deviation between AFR and wideband...

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Your much appreciated suggestion about zeroing out the MAF adjustment sliders, after changing my Global Fuel, is how I have been “progressively” making my adjustments to get my present settings…I was afraid that more tedious adjustments (and lucky guessing) would need to continue. Apparently, I may need to continue increasing my Global Fuel. I wish that I could identify a pattern, or find a detailed description of the correlations, concerning the addition (adjustment) of “X” increments at Global Fuel means corresponding reductions (changes) of “Y” amounts for maintaining proper MAF (at 50 Hz), Deadtime, LTFT Lo, and ISCPosition idle values. When I change one value, the other values need attention, making it tedious (and some guess work). Coincidentally, V2 does not provide access to the DA tables.

Xit40 said:

If you just want to lean out you're afr's for WOT, then I would just start pulling fuel on the rpm fuel sliders until you're happy with it. The stock ecu is crazy rich when you're in boost and at WOT, so pulling fuel there is normal.

If you wanted everything super accurate, then you could follow JeffGST's boostest calibration page. If you can get a full run from 2000 rpm til redline, that would be great. Also, you MAFRaw is getting up there.

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I think that I’ll initially try reducing my RPM Fuel sliders at the corresponding RPMs prior to making additional changes to my MAF sliders. I have the same injectors as you (FIC 850cc). Your provided link from JeffGST is one of the resources that I attempted to follow. Regarding a WOT pull from 2000 RPM, I have done some, and I can perform one at my current settings before doing any further changes. However, I have an IPT built automatic transmission that downshifts aggressively during WOT at that RPM, meaning the log will show downshift(s), and upshift(s) during the WOT pull. You are quite observant regarding my MAFraw since my 2g MAF limit is 2700 Hz, and I am near there.

Thanks for all the ideas I have been receiving.
Jim

Your deadtime settings for FIC injectors seems quite high. Mine is set at 315, but it seems to work for you. I didn't think that you had an automatic so I guess you could do your best to try and get as full a run as possible. Good luck with your tuning.