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Old 01-24-2008, 02:52 PM   #1
Infamous1
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Default Understanding Turbo Dynamics

I have a little knowledge of how they work hand in hand with WGDC values and such. But just looking for a little insight on how to achieve a certain value at different RPM's and the reflection it has in each gear.
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Old 01-24-2008, 03:05 PM   #2
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Read the cobb boost tuning article ... it explain everything

But real quick. Turbo dynamics is the on-the-fly adjustment the ecu needs to make the car achieve your target boost.

So:

You specify your boost targets
You specify the WGDC you need to reach those values

The ecu add or subtracs TD to achieve your boost targets.

You'll never achieve your boost targets perfectly because weather conditions constantly change. So you have a good tune when you're close and your TD values are low
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Old 01-24-2008, 03:40 PM   #3
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The Cobb description is either incomplete or incorrect depending upon how you look at it.

The best description was merchgod's (Tea Cups) thread on enginuity.org. Maybe he'll replicate it on another board someday.
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Old 01-24-2008, 03:42 PM   #4
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The ecu can adjust for IAT which has the biggest environmental impact to boost.
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Old 01-24-2008, 05:15 PM   #5
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Quote:
Originally Posted by mickeyd2005 View Post
The Cobb description is either incomplete or incorrect depending upon how you look at it.

The best description was merchgod's (Tea Cups) thread on enginuity.org. Maybe he'll replicate it on another board someday.
Thats what im hoping for
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Old 01-24-2008, 05:27 PM   #6
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Old 01-24-2008, 05:32 PM   #7
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YYYEEEAAAAHHHH! thanks!
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Old 01-24-2008, 07:03 PM   #8
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Cobb's guides might be easy to grasp for a beginner, but otherwise they suck.
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Old 01-24-2008, 07:35 PM   #9
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Quote:
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Cobb's guides might be easy to grasp for a beginner, but otherwise they suck.
Actually... by mislabeling the TD parameters, Cobb makes it VERY easy for a beginner to misunderstand it.

A relatively smart guy asked me to look at his ST tune. He had zeroed out all the values in the table, TURBO DYNAMICS (COARSE GAIN LOW). That's TD Integral Negative in open source speak. That means that if he overboosted, he would have no wait to wind down the WGDC other than TD proportional which is quite limited.
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