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prj
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« Reply #15 on: August 19, 2023, 03:05:45 AM »
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Don't run 0.9 on peak torque, it's not a NA engine.
You will make more power with 0.82 and more ignition. Source: "trust me bro, I've run it on dyno".
Since you have EGT sensor you can also 0.82 flat and let ATR take care of the rest.
Lower the boost in the midrange a little, set normal lambda, add ignition timing, and you will probably be able to add a little boost on the top end too.
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aef
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« Reply #16 on: August 22, 2023, 06:31:18 AM »
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Hi,
car runs much better now with the richer fueling. very responsive to the pedal and kind of aggressive.
before i waited and waited for the boost to build and for the car to move and now its just moving based on fuel and ignition and then boost is coming in.
do you think the overlap where the boost is rising and the lambda is falling (3000 to 4500) is good or would you desing the lambda curve different?
ignition is still a problem on the 3rd but is was always 30+ degree celsius when i logged.
pssol has this dent @ 3500 but rlsol dont.
KFURL is stock, KFPRG is stock, KFPBRK/KFPBRKNW is changed in the 165 row starting from 4000rpm
intake is 034 motorsport
thank you very much prj for the lambda hint. it makes alot difference.
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aef
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« Reply #17 on: August 22, 2023, 07:01:58 AM »
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log
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nyet
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« Reply #18 on: August 22, 2023, 09:59:04 AM »
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You can (and probably should) move the VVT changover anyway
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prj
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« Reply #19 on: August 22, 2023, 10:46:29 AM »
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EGT looks much more sustainable now. You're probably not going to hit ATR unless you push hard on the autobahn, and this is good.
Ignition retard probably okay too... I think at lower rpms you can even add a little.
I'll tell you again, ignition is not affected very much by IAT. Mostly by cylinder filling.
30C here or there makes so little difference when you are filling the cylinder and compressing the air after that. Your car won't magically make 3 degrees more timing in winter or anything.
For valve overlap it is very hard to say. Your current one is quite aggressive already...
I'd say even switching at 5k is probably more than enough.
But the real answer what the sweet spot is can only be done on dyno.
Tbh your tune looks quite decent now. It is possible to make more power, but not safely.
Boost is on target, no excessive knock and EGT is also now under control.
Looks like you have some ethanol code in there as well - in that case if that is actually working you can add some ethanol content and blend boost based on that to fully use your turbo.
But on 98 RON (or whatever you are using now) I see no point to push anymore. Also, tuning with this giant torque in the middle is not what I would do, but if you like it like that, then up to you. If you have a built engine and it's not knocking it is not going to break anything.
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« Last Edit: August 22, 2023, 10:51:20 AM by prj »
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aef
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« Reply #20 on: August 23, 2023, 10:18:37 AM »
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These are the nicest words from prj I have read in a long time  Attached is a log where i added 3degree overall in my e100 kfzw1/2 and based on the e65 blend the ignition angle difference is 2 degree. I have nearly the same ignition retard in this log as in the last log (which was good pumpgas). I will try to log the car with more advance and will restock my ethanol to test with higher E content. |
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prj
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« Reply #21 on: August 24, 2023, 03:32:11 AM »
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Keep in mind that on ethanol you can usually run all the boost and all the ignition on E50.
So blending the KFZW/2 maps only based on ethanol content is not the right way to go. You need a map in between that, which gives blending factor based on ethanol content.
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aef
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« Reply #22 on: August 24, 2023, 03:50:51 AM »
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i have two additional kfzw1 and 2 maps where i put the theoretical numbers for e100 content. lets call them eKFZW1/2
and i have the stock petrol kfzw maps lets call them pKFZW1/2
based on the reading from the flexfuel sensor it will blend between my pKFZW1/2 and e100KFZW1/2
it will also calculate the krkte value for this ethanol content.
that is all what the custom code is capable of currently.
boost will stay the same
i will alter my variable names a bit and log with higher values in my eKFZW maps.
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prj
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« Reply #23 on: August 24, 2023, 10:20:25 AM »
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As I said, you need an intermediate map:
e content -> 1d map -> e content for ignition -> and then use that to interpolate the maps.
Same for boost.
e content -> 1d map -> e content for boost -> and then use that to interpolate.
Ethanol influence is linear only on krkte, it is completely non-linear for boost and ignition.
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aef
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« Reply #24 on: August 24, 2023, 01:41:29 PM »
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i think i understand your point because my krkte is 10% too small with the e65.
the current calculation is linear.
the car and the retard behaves strange or interesting...
yesterday i had alot of retard with only +3° in my eKFZW1/2
today i added more and more to eKFZW1/2 and the ignition angle climbed and the retard is moderat
the +12° file has best ignition angle because of the least retard.
the real ignition based of the e65 content is ~7° higher than on petrol (xxx_12 logfile)
I will have to investigate why the content reading from the flexfuel sensor drifts a bit on high rpm
Time to read and learn some theory about ethanol and ignition °
regards
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aef
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« Reply #25 on: August 30, 2023, 05:31:53 AM »
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Turns out my car is very picky when it comes to iat.
This is my only explanation of why i can run 1.6bar flat with 23degree today at 18degree celsius outside.
Last week it had 30+ degree celsius outside and i could only run 1.6bar to 1.2bar with 21degree up top.
If this is how my engine "should" perform with 8,5:1 on fuel I will have to take it apart to find out about my cr and lower it.
I now have reverted the lower eKFZW1/2 rows back to stock and still have added 14degree up top.
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aef
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« Reply #26 on: September 02, 2023, 03:03:02 PM »
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Hi,
interesting find here!
My car is faster with more ignition because of better fuel.
My car isnt faster with more boost on same fuel.
edit: the 1.6 to 1.6bar log is fucked somehow
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« Last Edit: September 03, 2023, 09:54:47 AM by aef »
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aef
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« Reply #27 on: September 03, 2023, 10:00:20 AM »
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here is a better log for the 1.6 to 1.6bar file and the car is faster, injection time and maf reading is higher.
so no need to change my cams or anything.
i dont understand why the one log is broken.
how the afr/lambda current is looking is just impossible i think
here is a new log.
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aef
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« Reply #28 on: November 15, 2023, 02:59:55 AM »
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Is this again anti judder?
When driving in the rpm window where the boost builds my car drives wavy.
As you can see in the log the B_ar is 1, throttle plate is opening and closing, boost is high low high low and ignition is wavy too.
This is happening with light request (60% wped) and high gear (4th).
What is the root cause here?
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aef
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« Reply #29 on: November 15, 2023, 09:59:38 AM »
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I changed the bottom rows of the KFDMDARO maps and it behaves better. Honestly, I don't know what I am doing with these numbers and there isn't much available on the forum. http://nefariousmotorsports.com/forum/index.php?topic=1905.msg18422#msg18422Also, I'm not sure if this is the root cause or if I work around it. Your contribution is highly appreciated |
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