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Author Topic: Boost help  (Read 22420 times)
wannabeS4
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« on: August 03, 2011, 06:37:09 PM »

I am using the tune posted by judeisnotobscure as a base line so far I have adjusted kflbts and kflbts. I just flashed the file and took some logs with ecux. I have a question about my desired and actual boost log. I also attached the file that I was running when these logs were taken.

Here are some of the logs. Let me know if you need more.Thanks



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nyet
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« Reply #1 on: August 04, 2011, 09:49:36 AM »

That req boost curve makes no sense to me.

Same with the fueling curve.
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judeisnotobscure
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« Reply #2 on: August 04, 2011, 12:10:25 PM »

can you apply smooth lines to those graphs?  It shouldn't be requesting that much up top, as it should taper to 11psi.  which version are you using?   and can you post up a screen shot of ldrxn?  did you lower the threshold at which kflbts is activated?  that can help as well.
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nyet
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« Reply #3 on: August 04, 2011, 12:28:12 PM »

can you apply smooth lines to those graphs?

RPM quantization error. the latest -rc3 of ecuxplot smooths the rpm data

http://nyet.org/cars/files/ECUxPlot-0.9r2.6-rc3-setup.exe

Also, graph WGDC.
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ME7.1 tuning guide
ECUx Plot
ME7Sum checksum
Trim heatmap tool

Please do not ask me for tunes. I'm here to help people make their own.

Do not PM me technical questions! 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 ex
wannabeS4
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« Reply #4 on: August 04, 2011, 01:29:20 PM »

I am using your latest revision of the 91 tune that you posted, I just added a little boost it should spike 18 tapper to around 15. I working on my second revision of this tune, I added some fuel up top and lowered the taper a couple psi.

Here is ldrxn


I dont know how to smooth the lines. Any help?

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judeisnotobscure
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« Reply #5 on: August 04, 2011, 01:57:29 PM »

be sure to adjust kfmldimx and kfldrl accordingly to go along with ldrxn... you must balance them all.
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wannabeS4
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« Reply #6 on: August 04, 2011, 02:04:29 PM »

How do you calculate the adjustment of those maps?
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judeisnotobscure
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« Reply #7 on: August 04, 2011, 03:41:30 PM »

they are percent wastegate duty cycle... there is no calculation that i know of... i get a feel for the wastegates by gradually increasing them and seeing the results... different turbos will have different wg pressures.  ie... ft's crack at 12 psi... 605's crack at 20 psi... these are generallities i'm speakin of.  for what you have, i would add 5 to the far right column of kfldimx but only in the middle section.  the duty cycle is limited to 95% unless you change the scalar that caps it.
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lulu2003
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« Reply #8 on: August 04, 2011, 04:14:41 PM »

when there is such a big gap between desired and actual boost, it is always important to log the WG Duty cycled to see if the actuator is ok.
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wannabeS4
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« Reply #9 on: August 04, 2011, 04:23:19 PM »

How do you log that with ecux? Is that just the n75 duty cycle?
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judeisnotobscure
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« Reply #10 on: August 04, 2011, 05:49:09 PM »

yes... wg duty cycle... and it directly relates to both kfldrl and kfldimx. 
I'm suprised you didn't get a negative deviation code off that log.  did u adjust the scalar starting with edl... that is the negative deviation margin scalar.
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wannabeS4
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« Reply #11 on: September 21, 2011, 02:11:10 PM »

Ok so I havent really had time to deal with this issue until now. I recently started having a hesitation/ loss of power during full throttle pulls. So I logged my car and couldnt figure it out. Here are some graphs









Could this be caused by a boost leak or a bad n75 vavle or something else I cant think of.
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infinkc
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« Reply #12 on: September 21, 2011, 02:16:44 PM »

have any codes? looks like soft limp is kicking in.
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wannabeS4
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« Reply #13 on: September 21, 2011, 02:35:45 PM »

2 codes :
17964 - Charge Pressure Control: Negative Deviation
        P1556 - 35-10 - - - Intermittent
16486 - Mass Air Flow Sensor (G70): Signal too Low
        P0102 - 35-00 - -

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nyet
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« Reply #14 on: September 21, 2011, 03:15:01 PM »

have any codes? looks like soft limp is kicking in.

I thought soft limp just cuts WGDC to 10%, but does not affect req boost?

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ME7.1 tuning guide
ECUx Plot
ME7Sum checksum
Trim heatmap tool

Please do not ask me for tunes. I'm here to help people make their own.

Do not PM me technical questions! 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 ex
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