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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Proper use of Boost Control Gain on Procede



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      07-29-2012, 09:20 PM   #1
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Proper use of Boost Control Gain on Procede

So this is from my other thread over @ http://www.e90post.com/forums/showthread.php?t=722784 where shiv recommends raising BCG for a pinned +5% Wastegate Compensation value.

Quote:
Originally Posted by shiv@vishnu View Post
On another note, if your wg compensation value is pinned at +5%, you should *raise* your boost control gain from 45 to 50. You went the other way

Shiv
This information contradicts his other post here:
http://www.e90post.com/forums/showthread.php?t=479249
where he says:
Quote:
Originally Posted by shiv@vishnu View Post
If your Wastegate Compensation is pinned at exactly 5.0%:
-Go to User Adjustable Menu and reduce "Boost Control Gain" from the default of 50 to 45.
From what I've been able to see INCREASING the value when this is HIGH is the correct thing to do, I was able to dial out my +5 by upping BCG to 57.

If the original post was erroneous I haven't seen it corrected anywhere, should the other thread be corrected to avoid people ruining their boost targeting?
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      07-30-2012, 12:05 AM   #2
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Good point......

IIRC didn't Joshboody post in another thread that he upped his boost control gain all the way to 100 to prevent boost overshoot after gear changes.
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      07-30-2012, 12:41 AM   #3
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Boost control gain is a multipler to the base wg table. 50 is table as is. Value below 50 is percentage decreased across the table... Value above is increased %. Is you max wg comp at 5% increase your gain.

I actually like a maxed gain of 5% to reduce overshoot... But only minimally.

If you increase or decrease gain, reset wg comp in the cruise control menu thingy.

Ilma you're thinking of boost response... I may have mistyped somewhere.
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      07-30-2012, 01:04 AM   #4
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Quote:
Originally Posted by Joshboody View Post
Boost control gain is a multipler to the base wg table. 50 is table as is. Value below 50 is percentage decreased across the table... Value above is increased %. Is you max wg comp at 5% increase your gain.

I actually like a maxed gain of 5% to reduce overshoot... But only minimally.

If you increase or decrease gain, reset wg comp in the cruise control menu thingy.

Ilma you're thinking of boost response... I may have mistyped somewhere.
Yup.....you did call it BCG

I was wondering because my boost recovery after a shift is perfect at gain = 50. No oscillations at all.

But thanks for the exlanation. Sounds about right applying a percent increase/decrease across the WG duty cycle table.
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