Michael55123

iTrader: (3)

I've got my LTFT's dialed in pretty good, A/F ratios as good as they're going to get with narrowband o2's, and I think most of the knock is removed. My timing table is UGLY, and my primary VE vs rpm is pretty ugly too, but bearable. The throttle response is good, and it pulls alright. My problem is when I try to turn my MAF back on, I can't get it calibrated right. I tried the spreadsheets but, it's just not working. I've logged 40+ minutes of MAF hz and Dynamic Airflow, but the spreadsheet didn't do it for me. When i turned the MAF back on my LTFT's went WAY WAY rich, like -10 to -14. Right now everything is between +-2. Here's my tune and log, ANY ANY ANY input at all is really appreciated. You guy's have all been helpful, and I'm learning alot.

On another note, my idle sometimes studders when I come to a stop as well. Dies every once in awhile, and ideas on that? I got my idle set around 900, my IAC steps fairly low like 40 ish once the cars warm, just no luck.

Thanks again:

http://verydrunk.info/hpt/2-6-2006.bin
http://verydrunk.info/hpt/2-6-2006-22.20DriveTowork.hpl


Is it normal to tap 140 on the way to work?

Anyhow, thanks again.

Mike

RedHardSupra

iTrader: (1)

if your maf screws it up while SD is normal then it's just maf. if your maf calibrations keep failing, it means your maf is either broken, or your air filter is dirty and throws so many bad reads into the sample that it throws of averages. clean your filter, post some logs with maf freq and dynair.
other than that, logs/tune looks clean

Michael55123

iTrader: (3)

Here's a log with MAf hz, and Dyn Airflow:

http://verydrunk.info/hpt/2-7-2006-gettinggasMAF.hpl

I'm going to pop the numbers into the spread sheet, and hope for the best again.

Mike

ChucksZ06

iTrader: (9)

I was viewing the spreadsheet that you have in your post and I noticed that the flow rate increases as the manifold vacuum decreases which seems correct. When I look at my stock tune (ls1 edit) for my z06 it is just the opposite. The flow in gm/sec decreases as the vacuum decreases. Am I stupid or what? By the way. I appreciate the info in your posts. Thanks.

Michael55123

iTrader: (3)

Much much better this time. Within -2 to +4. I suspect if I fed the spreadsheet more maf hz and dyn airflow, I'd be alot closer too. Thanks RedHardsupra, your work is really appreciated, and so is your input.

Mike

RedHardSupra

iTrader: (1)

cool! good to hear. use the history function in my spreadsheet to gather more and more data from daily drives, it helps.

Michael55123

iTrader: (3)

Am I able to add data that was collected when not in SD? Do I have to have the MAF off for the data to be what I want?

Mike

RedHardSupra

iTrader: (1)

sure. i should probably update the info in the spreadsheet, since the data against which we calibrate MAF is a VE calculation, it doesn't matter if you take measurements in SD or MAF mode, as long as your VE is dialed in.

Michael55123

iTrader: (3)

Will changing the MAF values vary my VE greatly?

RedHardSupra

iTrader: (1)

not VE, fuel trims will change though (not in SD mode of course)

Michael55123

iTrader: (3)

Guess that should of been obvious to me. Thanks for helping me out, I really appreciate it. Am I crazy, or is my timing sort of low? My tables look kind of funky, because I've had to take out certain places. Should I try smoothing it? My cam does have +4 degrees in it. But I see alot of guys running crazy timing? I'm running good gas, and see knock in certain places, as you can see by my tune, and the random dips in the graph. Should I start over with my stock timing, I tried with z06 timing? Just curious.

Thanks again!

RedHardSupra

iTrader: (1)

timing is very particular, some cars don't gain anything above 22, others will take 34 and wont' make a peep. short of going to a steady state dyno, it's a guess and experimentation time.