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Old 01-02-2003, 07:11 PM   #1
koloumb
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Default Stage 2 closed loop boost map

Anyone else running stage 2 [with stage 2 components] closed loop boost? If so, could you post your boost map settings for comparision?

Thanks.

_0wen_
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Old 01-02-2003, 09:09 PM   #2
CreoWRX
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I will, if I ever figure it out/get it done.

-Mike-
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Old 01-02-2003, 09:53 PM   #3
DocDetroit
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I'm currently running open loop. I need to find some time to mess around with the closed loop stuff.

I know the boost units (who coined the term boostians?) are not the same from car to car, but I wish TurboXS would publish an extremely conservative closed loop map. Maybe from 12 PSI peak to 7 PSI tapered at redline that I could use as a basis for my closed loop boost map.
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Old 01-02-2003, 11:03 PM   #4
koloumb
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Hmm... weird that barely anyone else is running closed loop [or they just don't want to give any "tuning secrets" away].

Here's what seems to work for my setup [gauge max boost ~15.5 - 16 PSI]:

Open / Closed
95 = 340
90 = 330
85 = 320
80 = 310
75 = 300

When I started out, I used these values as the manual stated to start around 200 and slowly increase the values:

95 = 200
90 = 195
85 = 190
80 = 185
75 = 180

I raised values by 5 until my boost gauge read ~15 PSI, further increased values until I got a CEL, and then back off 15 counts.

_0wen_
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Old 01-03-2003, 01:52 AM   #5
epsilon
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Quote:
I know the boost units (who coined the term boostians?) are not the same from car to car, but I wish TurboXS would publish an extremely conservative closed loop map. Maybe from 12 PSI peak to 7 PSI tapered at redline that I could use as a basis for my closed loop boost map.
Hear, hear
Quote:
I raised values by 5 until my boost gauge read ~15 PSI, further increased values until I got a CEL, and then back off 15 counts.
Did you try adjusting the ABC? How many turns before/after?

I wonder if one should follow more of an open loop curve, rather than a gradually diminishing one, as paul99se suggested...
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Old 01-03-2003, 05:16 PM   #6
koloumb
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d'oh - I totally forgot there was already another thread about this issue.

_0wen_
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Old 01-03-2003, 05:32 PM   #7
paul99se
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Closed loop units are a target for boost, open loop units are a target for BCS% (wastegate) activity. One unit does not convert into another using a constant.

What if engine load were higher (5th gear) or weather were colder (increased O2 density) or spooling began earlier (a long pull from low RPM)... in these cases, the BCS% setting that worked great under different conditions would now cause an overboost situation; however, the boost target remains the same (you want 16psi, you get it, whether it's cold or you're in 5th gear or you spooled up in lower rpms because you were under high load going up a hill). This is why closed-loop control is so great.

If you simply follow a "95 = 340" style conversion (which will not work) and start raising boost map values in the upper rpm range, as in an open-loop map, you will see boost levels raise (not remain flat, as they might have in an open loop map).

You can test this by setting all of your boost map to a conservative setting like "200" and then making a run in 4th gear... you should see a relatively consistent boost level from post-spool up to redline in your logs.

-Paul
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Old 01-03-2003, 07:14 PM   #8
epsilon
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Thank you for the clarification on the distinction between open and closed loop, Paul. Incidentally, I'd love to see you post the S2+ maps on your web site. My uppipe is arriving next week.

john
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Old 01-04-2003, 12:29 AM   #9
paul99se
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This particular Stage 2+ map is definitely not a conservative one. I recommend trying the Stage 2+UpPipe map from WRXHackers and then creating your own closed-loop boost map. From there, you can road tune for your particular car.

-Paul
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