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carsey
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« on: September 08, 2014, 07:34:54 PM »
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Got myself fome of the 600cc bosch injectors. Currently on scaling them in. I have KRKTE set to around 0.053 region and FKKVS set to all 1's. I have fuel trims of adding roughly 11% extra fuel. I have a FKKVS fixer tool where I upload a log of engine speed, duty cycle and lambda control with a copy of my fkkvs map.
Now, how is best to feed the tool a sample log? A WOT run in 3/4th gear and adjust from there, or a good few miles of cruising, WOT and over run to get a range of results?
Chris
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ddillenger
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« Reply #1 on: September 08, 2014, 07:48:37 PM »
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Adaptations must be disabled. Roberts requires NOLRA=7, Others, NOLRA=6 (to leave idle area on).
Then, you need to drive for around 30 minutes (logging ONLY the needed variables to keep the log small) at varying pulsewidths. Try to get as light/heavy loads as possible while staying in closed loop. Obviously, if you have a wideband you can do some WOT.
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Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your experience!
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aef
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« Reply #2 on: September 09, 2014, 12:12:19 AM »
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My impression was that FKKVS is only used for the bad siemens dekas?
Finetuning KRKTE 2-3 times after some good amount of driving should result in 0% trims.
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ddillenger
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« Reply #3 on: September 09, 2014, 12:16:23 AM »
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My impression was that FKKVS is only used for the bad siemens dekas?
Finetuning KRKTE 2-3 times after some good amount of driving should result in 0% trims.
No. No injectors are perfectly linear, so there will always be corrections. I prefer to keep KRKTE at it's calculated value, and instead use FKKVS/KFKHFM to keep everything working well together. Otherwise, you'll be way off in other areas (WOT for instance.) |
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Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your experience!
Email/Google chat:
DDillenger84(at)gmail(dot)com
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aef
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« Reply #4 on: September 09, 2014, 12:22:16 AM »
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You live and learn  |
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Lost
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« Reply #5 on: September 09, 2014, 02:17:45 AM »
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No. No injectors are perfectly linear, so there will always be corrections. I prefer to keep KRKTE at it's calculated value, and instead use FKKVS/KFKHFM to keep everything working well together. Otherwise, you'll be way off in other areas (WOT for instance.)
Now i am confused. I had similar question in http://nefariousmotorsports.com/forum/index.php?topic=6726.0title=I was told to tune Krkte instead. Can you plz explain the diff for me? |
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ddillenger
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« Reply #6 on: September 09, 2014, 02:23:47 AM »
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Calculate KRKTE for E85, not gasoline. Then modify FKKVS. You were told not to leave KRKTE alone when switching to E85. |
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Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your experience!
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DDillenger84(at)gmail(dot)com
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Lost
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« Reply #7 on: September 09, 2014, 04:18:46 AM »
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Calculate KRKTE for E85, not gasoline. Then modify FKKVS. You were told not to leave KRKTE alone when switching to E85.
I was not switching from gasoline too e85. I always drove on Ethanol. Diff was Sommer e85 vs winter e70 blend. My LTFTs changed from 5% to 17% now. |
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carsey
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« Reply #8 on: September 09, 2014, 05:45:22 AM »
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So I how should I log and modify fkkvs? Random drive with me7logger attached and after 5-10miles or so stick data into the fixer?
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carsey
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« Reply #9 on: September 09, 2014, 05:50:27 AM »
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Sorry missed your first reply there. Will get that done.
Has anyone used that fkkvs fixer which is a program, upload a spreadsheet of your fkkvs and a log and then you can choose smoothing etc?
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phila_dot
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« Reply #10 on: September 09, 2014, 06:35:47 AM »
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FKKVS is used to correct on time for non-linearity at specific effective on times. It is only necessary for corrections in the lower and upper non-linear regions.  |
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elRey
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« Reply #11 on: September 09, 2014, 10:58:52 AM »
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I would also suggest disabling TEB (evap) while fine tuning inj. And log B_lr and only apply rows where B_lr = 1 ( even leave off leading and trailing B_lr=1 rows ).
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carsey
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« Reply #12 on: September 11, 2014, 06:26:28 PM »
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Cool, so I need to set my NOLRA to 6 (not sure what this roberts thing is).
Set ME7logger to log. nmot_w, te_w, fr_w and then drive normally with good load conditions for about 25-30mins
Sound about right?
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phila_dot
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« Reply #13 on: September 11, 2014, 06:43:40 PM »
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I doubt you are within any non-linear region under "good load".
If you look at the graph that I posted, FKKVS would only be used to correct from ~1.25 ms to ~1.75 ms. TEMIN would be ~1.25 ms and above ~1.75ms is linear and would be tuned with KRKTE and TVUB.
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carsey
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« Reply #14 on: September 12, 2014, 05:26:42 AM »
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Surely injectors arent non-linear across virtually the whole range?
Im using the bosch 0280 158 298
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