NefMoto > Noob Zone > Noob Questions (Moderator: turboat) > cmd boost VS actual boost: delta at high rpm
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Author Topic: cmd boost VS actual boost: delta at high rpm  (Read 4709 times)
pieros_net
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« on: February 18, 2019, 02:39:59 AM »
goodmorning,
I need clarification regarding a some delta I got between command and actual boost during high rpm
the turbo installed is the TD04L

I was thinking it happened due to:

1)may be small turbo cannot get high pressure at high rpm?
2)the setting of  the wastegate can impact the pressure at that high rpm? or only the overboost pressure?

attached you can see the log of the pressure and the setup of duty cicle limit of N75 by KFLDIMX

thank you so much.
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nyet
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« Reply #1 on: February 18, 2019, 02:42:07 AM »
Post ME7L logs.

Obey forum rules.
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fknbrkn
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mk4 1.8T AUM
« Reply #2 on: February 18, 2019, 05:15:58 AM »
13L ends at 220 gs
Looks like 1st option
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pieros_net
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« Reply #3 on: February 18, 2019, 07:34:31 AM »
Attached can you see the full log by m7logger during 4 gear WOT
thank you to push me about m7logger, because the log is very detailed and I can understand perfect situation about AFR ect....

please have a look and tell me if need to adjust somethink as per log.

thank you
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pieros_net
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« Reply #4 on: February 18, 2019, 08:10:12 AM »
attached clear graphic about the two pressure. Cmd VS Actual
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nyet
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« Reply #5 on: February 18, 2019, 04:30:14 PM »
Quote from: pieros_net on February 18, 2019, 07:34:31 AM
Attached can you see the full log by m7logger during 4 gear WOT
thank you to push me about m7logger, because the log is very detailed and I can understand perfect situation about AFR ect....

please have a look and tell me if need to adjust somethink as per log.

thank you


PLEASE OBEY THE DAMN FORUM RULES

http://nefariousmotorsports.com/forum/index.php?topic=4094.0title=
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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 experience.
pieros_net
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« Reply #6 on: February 19, 2019, 06:42:08 AM »
Quote from: nyet on February 18, 2019, 04:30:14 PM
PLEASE OBEY THE DAMN FORUM RULES

http://nefariousmotorsports.com/forum/index.php?topic=4094.0title=

sorry again!

attached log csv by me7logger and a graphic.
thank you
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aef
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« Reply #7 on: February 19, 2019, 07:41:10 AM »
okay and the problem is?

its physics, if your wg is shut @ 95% and turbo will not make anymore boost  Roll Eyes
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pieros_net
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« Reply #8 on: February 19, 2019, 07:53:45 AM »
my doubts are:

If wastergate DC is 95%, can happened that the phisical condition is not like this, due to a bad setting of the his threaded bar?
I'm thinking that may be the N75 try to keep closed the WG (with a 95% DC) but due to a wrong mechanical regolation it is opening anyway and no keep the pressure.
I remember that who tune my car  played a little bit with that regulation in order to remove an overboost excess.

if all write above is wrong, it sould be a limit of my TD04L ?
in case I have to re tune the KFLDRL according to the actual output for good practice?

thank you again
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nyet
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« Reply #9 on: February 19, 2019, 09:56:34 AM »
Quote from: pieros_net on February 19, 2019, 07:53:45 AM
my doubts are:

If wastergate DC is 95%, can happened that the phisical condition is not like this, due to a bad setting of the his threaded bar?
Yes, that is possible

Quote
if all write above is wrong, it sould be a limit of my TD04L ?
Yes

Quote
in case I have to re tune the KFLDRL according to the actual output for good practice?

Entirely up to you. If you are having boost control issues, it would be a good idea, especially if you experience part throttle boost control issues.
« Last Edit: February 20, 2019, 12:26:09 AM by nyet » Logged
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aef
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« Reply #10 on: February 19, 2019, 11:25:46 PM »
How big is this TD04L compared to a K04-022/23 ?
How much boost does it produce without N75 plugged or in other words with 0% wgdc?
This is a good way to set the preload of your wastegate.
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pieros_net
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« Reply #11 on: February 20, 2019, 02:24:33 AM »
Quote from: aef on February 19, 2019, 11:25:46 PM
How big is this TD04L compared to a K04-022/23 ?
How much boost does it produce without N75 plugged or in other words with 0% wgdc?
This is a good way to set the preload of your wastegate.

TD04L approximately is same to K04-022.

I calculated the CFM at 5000rpm, it is 310, so as per compressor map I'm near a limit (360)  but with a little bit chance to increase
my strategy to try to improve it is showing on the attached graphic with comments.

there is also a question about an issue that i cannot understand.
in order to get very close the cmd pressure with actual,  on the rpm with max boost I set 77% duty cicle WG on the map KFLDIMX, but still actual it is around 83 and the two pressures have a mismatch.
why no follow the limit set on that map?


thank you
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nyet
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« Reply #12 on: February 20, 2019, 08:59:31 AM »
1) that is the I limit not the WGDC itself
2) it is prelin
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ME7.1 tuning guide (READ FIRST)
ECUx Plot
ME7Sum checksum checker/corrrector for ME7.x

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 experience.
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