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Title: Boost help Post by: wannabeS4 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 (http://i33.photobucket.com/albums/d86/jpman95/Boostpsi.png) (http://i33.photobucket.com/albums/d86/jpman95/O2volts.png) (http://i33.photobucket.com/albums/d86/jpman95/AFR.png) (http://i33.photobucket.com/albums/d86/jpman95/Knock.png) Title: Re: Boost help Post by: nyet on August 04, 2011, 09:49:36 AM That req boost curve makes no sense to me.
Same with the fueling curve. Title: Re: Boost help Post by: judeisnotobscure 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.
Title: Re: Boost help Post by: nyet 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. Title: Re: Boost help Post by: wannabeS4 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 (http://i33.photobucket.com/albums/d86/jpman95/ldrxn.jpg) I dont know how to smooth the lines. Any help? Title: Re: Boost help Post by: judeisnotobscure 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.
Title: Re: Boost help Post by: wannabeS4 on August 04, 2011, 02:04:29 PM How do you calculate the adjustment of those maps?
Title: Re: Boost help Post by: judeisnotobscure 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.
Title: Re: Boost help Post by: lulu2003 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.
Title: Re: Boost help Post by: wannabeS4 on August 04, 2011, 04:23:19 PM How do you log that with ecux? Is that just the n75 duty cycle?
Title: Re: Boost help Post by: judeisnotobscure 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. Title: Re: Boost help Post by: wannabeS4 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
(http://i33.photobucket.com/albums/d86/jpman95/rev4boost.jpg) (http://i33.photobucket.com/albums/d86/jpman95/rev4n75.jpg) (http://i33.photobucket.com/albums/d86/jpman95/rev4a-fratio.jpg) (http://i33.photobucket.com/albums/d86/jpman95/rev402volts.jpg) (http://i33.photobucket.com/albums/d86/jpman95/rev4iat.jpg) (http://i33.photobucket.com/albums/d86/jpman95/rev4maf.jpg) (http://i33.photobucket.com/albums/d86/jpman95/rev4ignitiontimingoverall.jpg) (http://i33.photobucket.com/albums/d86/jpman95/rev4pedalposition.jpg) Could this be caused by a boost leak or a bad n75 vavle or something else I cant think of. Title: Re: Boost help Post by: infinkc on September 21, 2011, 02:16:44 PM have any codes? looks like soft limp is kicking in.
Title: Re: Boost help Post by: wannabeS4 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 - - Title: Re: Boost help Post by: nyet 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? Title: Re: Boost help Post by: wannabeS4 on September 21, 2011, 04:16:20 PM Any ideas?
I just checked for boost leaks and couldnt find one. Title: Re: Boost help Post by: nyet on September 21, 2011, 04:35:36 PM Post up your .csv; I'll take a peek time permitting.
Title: Re: Boost help Post by: wannabeS4 on September 21, 2011, 04:48:37 PM Here is my csv file
Title: Re: Boost help Post by: nyet on September 21, 2011, 04:59:44 PM Can you get clean logs?
2500 rpm ALL THE WAY to redline. Your first run shows a boatload of boost oscillations (your PID tuning is a disaster) but your run ends early, so I can't tell what it would have done up top. Your second run starts super late, then you have positive deviation limp (100 wgdc, but really short on boost). (http://nyet.org/cars/logs/rev%204%20log-boost.png) Title: Re: Boost help Post by: wannabeS4 on September 21, 2011, 05:12:52 PM That is one run, I'm getting massive throttle cut around 4500 rpm. I will go and do some more logging when I get a chance.
Title: Re: Boost help Post by: NOTORIOUS VR on September 21, 2011, 06:02:14 PM load the bae file back in and see if the problems go away
Title: Re: Boost help Post by: nyet on September 21, 2011, 09:22:23 PM I'm guessing your WG linearization is totally screwed, unless your PID D term isn't stock.
you are showing MASSIVE overshoot. Need to pull a lot more WG right before req meets actual. Title: Re: Boost help Post by: judeisnotobscure on September 22, 2011, 10:11:58 AM definately looks like the file/n75 map not giving correct duty.. goes very rich... have you adjusted the fueling tables or are they still stock like i left them?
Title: Re: Boost help Post by: wannabeS4 on September 22, 2011, 10:37:56 AM I changed the kfldimx table in the middle because on a previous revision I was meeting requested boost. I'm hopefully going to have some time today to flash a new file and get some logging done.
Title: Re: Boost help Post by: wannabeS4 on September 23, 2011, 12:30:52 PM OK so I replaced kfldimx table with the original one from jude's file and it got rid of the overboost and throttle cut. I also found out that my turbos just cant flow more than 13psi up top. That gave me a hard limp mode during logging.
Title: Re: Boost help Post by: nyet on September 23, 2011, 12:33:38 PM K03s?
Title: Re: Boost help Post by: wannabeS4 on September 23, 2011, 12:34:27 PM unfortunately :'(
Title: Re: Boost help Post by: wannabeS4 on October 19, 2011, 02:33:07 AM So I am still trying to figure out why my boost tapers up instead of down following the ldrxn table.
Title: Re: Boost help Post by: Rick on October 19, 2011, 03:25:22 AM Boost and Load are related, but it isn't a linear relationship due to corrections. What is load doing?
Rick Title: Re: Boost help Post by: wannabeS4 on October 19, 2011, 09:43:31 AM Load is decreasing, it goes down from 200 to 140 on the log graph.
Title: Re: Boost help Post by: judeisnotobscure on October 19, 2011, 10:06:25 AM the ldrxn table in this file is simply set a little high up top... taper it more up top and req will line up better with actual.
I would also recomend messing with kflbts, note what load you are at in the rpm band when tuning kflbts, as this plays a big role. Title: Re: Boost help Post by: wannabeS4 on October 19, 2011, 10:46:12 AM I have it tapering to around 13 psi but it is still requesting 16 psi for some reason.
Title: Re: Boost help Post by: nyet on October 19, 2011, 11:02:30 AM I have it tapering to around 13 psi but it is still requesting 16 psi for some reason. There is no table that says '13 psi' You clearly have too much requested load. Title: Re: Boost help Post by: lulu2003 on April 15, 2012, 04:25:07 AM any updates?!
but I take this thread for a common question: at the end of the rpm axis around 6000 he does not get the desired boost, despite 95% duty cylce. I am looking for some common problems with the same nature. reasons: - boost leak between compressor and intake. - too weak WG actuators (which opens by exaust gas pressure) - N75 Stuff - too small turbos. are there any other possible reasons for that? how do you determine that the turbos (or compressor wheels) are at their limits? what are the limits? overrevs and bad efficiency -> hot IAT. I would like to see some meanings based on either theory an physics but also experience. thanks in advance. |