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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > MHD N55 E-Series - general discussion



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      05-20-2020, 06:11 PM   #8515
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Quote:
Originally Posted by Street of Rage View Post
i notice the pattern when new map version drops.
Lol right , "my farts are quiter HELP!!!!"
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      05-21-2020, 08:29 AM   #8516
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Originally Posted by Pladi View Post
Did twisted tuning ever explain why his OTS maps are always off boost and load target by like 20 % ...

Whats the deal with that ? U see same torwue curve too always going down during rpm increase. This does not happen in stock maps.. or n54 ots maps for that matter..
what do you mean? log looks fine and looks like every single n55 log. Stock turbo is tiny and load requested is kept a little above load actual to avoid throttle closures.

Last edited by bbnks2; 05-21-2020 at 01:51 PM..
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      05-23-2020, 08:52 AM   #8517
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Quote:
Originally Posted by bbnks2 View Post
what do you mean? log looks fine and looks like every single n55 log. Stock turbo is tiny and load requested is kept a little above load actual to avoid throttle closures.
Yes they do look like any other log. At close to 100 percent waste gate values the small turbo explanation would make sense. The waste gate is only 50 percent..yet targets are off. I am not saying that things are catastrophic. But the tunes and boost control can be better..
You think these maps are perfect ? They are not..
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      05-23-2020, 01:12 PM   #8518
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Quote:
Originally Posted by Pladi View Post
Yes they do look like any other log. At close to 100 percent waste gate values the small turbo explanation would make sense. The waste gate is only 50 percent..yet targets are off. I am not saying that things are catastrophic. But the tunes and boost control can be better..
You think these maps are perfect ? They are not..
That is a pretty good clean log lol. "Boost control" looks fine. You're idea of "not perfect" is pretty skewed if you think wgdc needs to be pinned at 100% and/or oscillating like crazy to stay dead on boost target within 1psi. You want that 1-2psi buffer and 10% load buffer. You also have to set the shelf maps up for cars that both under-perform and over-perform. I did my fair share of picking apart the shelf maps so it's just odd seeing you complain about a non-issue now as the logs look pretty damn good.
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      05-23-2020, 03:58 PM   #8519
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Originally Posted by kanovic View Post
Finally flashed with mhd. Car feels good and smooth. Here is a log if someone can take a look and see if anything is off. Thanks guys

https://datazap.me/u/kanovic/log-158...o=3&mark=32-77
Bumps. Anyone?
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      05-23-2020, 05:59 PM   #8520
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Quote:
Originally Posted by kanovic View Post
Bumps. Anyone?
your railpresure is maxing out and crushing at the beginning of the pull,
just like mine does, .
but you can try resetting the adaptations for "high pressure fuel system".
might work for you.

I sent some logs to Justin a week or two back, I assume he is still looking into it.
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      05-23-2020, 06:08 PM   #8521
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Quote:
Originally Posted by Keyless77 View Post
your railpresure is maxing out and crushing at the beginning of the pull,
just like mine does, .
but you can try resetting the adaptations for "high pressure fuel system".
might work for you.

I sent some logs to Justin a week or two back, I assume he is still looking into it.
Could it be a sign of a failing hpfp? It been changed once already but it was a while ago.
Also what would be a normal rail pressure throughout a pull?
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      05-23-2020, 08:02 PM   #8522
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Quote:
Originally Posted by kanovic View Post
Could it be a sign of a failing hpfp? It been changed once already but it was a while ago.
Also what would be a normal rail pressure throughout a pull?
Just replaced my HPFP now rail pressure never drops below 2300

When I installed stage 2 lpfp my old hpfp would crash down to 1600 so thats why i replaced it. Plus I would have rough idles and long crank cold starts

Now its all good
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      05-23-2020, 09:53 PM   #8523
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Quote:
Originally Posted by xxMike61 View Post
Just replaced my HPFP now rail pressure never drops below 2300

When I installed stage 2 lpfp my old hpfp would crash down to 1600 so thats why i replaced it. Plus I would have rough idles and long crank cold starts

Now its all good
At wot throttle mine does not seem to drop below 2300psi. I just don’t know if that is good or not since like the guy said it seems to max out then dies off..
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      05-24-2020, 01:53 AM   #8524
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Quote:
Originally Posted by kanovic View Post
At wot throttle mine does not seem to drop below 2300psi. I just donít know if that is good or not since like the guy said it seems to max out then dies off..
I don't think its a hardware issue, it doesn't crush to 1600, it's just maxing out at above 3k psi, causing the control unit to abruptly correct it down to a normal value, then maxing again ....i don't think its healthy for the pump,(anyone feel free to correct me).
Some logs from other members show psi going to 2800 and slowly going back to normal value between 2.2-2.6k psi.
My observation is that, higher psi (above 2.8k) started with last two map versions.

Question, are you driving A DCT trans.?

Last edited by Keyless77; 05-24-2020 at 11:10 AM..
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      05-24-2020, 08:39 AM   #8525
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Quote:
Originally Posted by Keyless77 View Post
I don't think its a hardware issue, it doesn't crush to 1600, it's just maxing out at above 3k psi, causing the control unit to abruptly correct it down to a normal value, then maxing again ....i don't think its healthy for the pump,(anyone feel free to correct me).
Some logs from other members show psi going to 2800 and slowly going back to normal value between 22-26k psi.
My observation is that, higher psi (above 28k) started with last two map versions.

Question, are you driving A DCT trans.?
Negative itís a 6mt.. car does not fee weird or anything. Of course it dies off at the higher rpm range but that is normal with a stock turbo.
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      05-24-2020, 09:01 AM   #8526
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Quote:
Originally Posted by bbnks2 View Post
That is a pretty good clean log lol. "Boost control" looks fine. You're idea of "not perfect" is pretty skewed if you think wgdc needs to be pinned at 100% and/or oscillating like crazy to stay dead on boost target within 1psi. You want that 1-2psi buffer and 10% load buffer. You also have to set the shelf maps up for cars that both under-perform and over-perform. I did my fair share of picking apart the shelf maps so it's just odd seeing you complain about a non-issue now as the logs look pretty damn good.
Fuel rail oscillation and off targets are indications that things can be better. There are soo many tables in xdf that he does not use... i am not talking about one log or clean log. I am saying these tunes can be better.
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      05-24-2020, 09:04 AM   #8527
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Quote:
Originally Posted by Keyless77 View Post
I don't think its a hardware issue, it doesn't crush to 1600, it's just maxing out at above 3k psi, causing the control unit to abruptly correct it down to a normal value, then maxing again ....i don't think its healthy for the pump,(anyone feel free to correct me).
Some logs from other members show psi going to 2800 and slowly going back to normal value between 22-26k psi.
My observation is that, higher psi (above 28k) started with last two map versions.

Question, are you driving A DCT trans.?
This fuel rail oacillations happens with alnost all healthy fuel pumps that can be driven to above 3000 psi. These sre very healthy pumps. The tune is the issue. This is whay i keep saying. We have performance issues with these tunes..
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      05-24-2020, 10:29 AM   #8528
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Just a question what's the point of driving the HPFP to so high pressure, if there is enough time? Mine is running at roughly 2300 psi 150 bar with 1.1-1.2 boost and my afr is around 12... At high rpm the oem turbo is out of air anyway...
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      05-24-2020, 10:43 AM   #8529
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Quote:
Originally Posted by Falko123 View Post
Just a question what's the point of driving the HPFP to so high pressure, if there is enough time? Mine is running at roughly 2300 psi 150 bar with 1.1-1.2 boost and my afr is around 12... At high rpm the oem turbo is out of air anyway...
High fuel pressure is needed for direct injection has nothing to do with boost.

Its for atomization and almost a requirement for these types of injectors.
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      05-24-2020, 10:52 AM   #8530
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Quote:
Originally Posted by Pladi View Post
High fuel pressure is needed for direct injection has nothing to do with boost.

Its for atomization and almost a requirement for these types of injectors.
Yep and that's why I didn't go too far away from the factory settings. Mostly I see sense in raising pressures if run out of fuel injection time.
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      05-24-2020, 11:29 AM   #8531
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Quote:
Originally Posted by Pladi View Post
Fuel rail oscillation and off targets are indications that things can be better. There are soo many tables in xdf that he does not use... i am not talking about one log or clean log. I am saying these tunes can be better.
Maybe you're just making general statements? There is no rail pressure oscillation in the referenced log.

Tuning is load based not boost based. Load needs a 10% ceiling to avoid boost oscillation and throttle closures. 1-2psi lower than target is just leaving a little but of room at 60% wgdc for overpeforming cars to run the same map without overboosting. Jot really sure what you expect a "good" log to look like.

If you want your boost the ride target perfectly then get a custom tune dialed in specifically for your car. You can request a more aggressive tune with 100 wgdc top and you can have the target boost lowered so that it doesnt look like you're "off target" when the stock turbo is outside of its efficiency range at high rpm.
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      Yesterday, 03:37 PM   #8532
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Quote:
Originally Posted by bbnks2 View Post
Maybe you're just making general statements? There is no rail pressure oscillation in the referenced log.
We were discussing log posted by kanovic
-------------
Quote:
Originally Posted by kanovic View Post
Finally flashed with mhd. Car feels good and smooth. Here is a log if someone can take a look and see if anything is off. Thanks guys

https://datazap.me/u/kanovic/log-158...o=3&mark=32-77
-----------

And correct, there was a log posted by carguy168 , a page earlier and ddnt show rail oscillation but still bit high rail pressure at beginning of the pull ,though not reaching 3k psi, so that one is ok., but several posted earlier show same behavior rail maxing out.

E.g
Quote:
Originally Posted by slow.e9x View Post

Last edited by Keyless77; Yesterday at 03:55 PM..
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