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Old 03-18-2011, 12:09 PM   #1
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Default EBC at limit of MAP sensor

Anyone have experience tuning EBC close to MAP sensor limit? How does EBC respond if initial overshoot is above MAP limit? If you set the EBC at MAP limit will it think that it is holding boost appropriately because the MAP value will eventually become constant?

Someone remind me what the standard MAP sensor limit is in PSI. Edit: 22.5 psi

I guess my fear is that the EBC control won't respond aggressively enough. If I set the limit for 22 psi, and it overshoots by 5psi, the ECU is only going to see a .5psi overshoot. I am assuming that there is a response difference between a 5 psi overshoot and a .5psi overshoot. Then again, I guess I can just tune for no initial overshoot, probably at the cost of spool.
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Old 03-18-2011, 12:21 PM   #2
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yeah it's going to get confusededed.
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Old 03-18-2011, 12:40 PM   #3
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Do you think it is best to tune for no initial overshoot, or back off on the closed loop target? If the latter, do you know how the algorithm works and what kpa delta defines the most aggressive response?

Ideally I'd set my buffer to a MAP limit - delta that would still allow the most aggressive response from the EBC/MS.
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Old 03-18-2011, 12:43 PM   #4
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Why not put a higher reading MAP sensor in?
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Old 03-18-2011, 12:48 PM   #5
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Drop in the MPX5700AP. good for 0 - 700 kPa. $14.
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Old 03-18-2011, 03:29 PM   #6
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Quote:
Originally Posted by richyvrlimited View Post
Why not put a higher reading MAP sensor in?
That's the plan, but I don't ahve a map sensor on hand. The weather is nice and I want to play with ebc tuning. Increasing boost threw off the tune a little.

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Drop in the MPX5700AP. good for 0 - 700 kPa. $14.
Perfect, where do I buy one of those?
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Old 03-18-2011, 03:46 PM   #7
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digikey.com
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Old 03-18-2011, 05:02 PM   #8
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digikey.com
Thanks, just ordered one. Do you put these as standard in all of your MS3 builds?
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Old 03-18-2011, 05:16 PM   #9
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Nope. I just went looking for one that would be physically the same as the MPX4250AP, that comes with the kits, but meter higher pressures. That's what I found for you.

This will literally drop in place.
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Old 03-18-2011, 05:34 PM   #10
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You the man!
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Old 03-18-2011, 06:05 PM   #11
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But that can only read up to 101 freaking PSI??? Does anyone in here actually idle at less than that?
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Old 03-18-2011, 06:15 PM   #12
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its in absolute.


the one we all use is 2.9 ~ 36.3 PSI, this is 2.18 ~ 101.5 PSI

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Old 03-18-2011, 06:34 PM   #13
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So even less than 100psi of boost??? Fail.
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Old 03-18-2011, 06:45 PM   #14
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sadly it only reads up to 86psi of boost.
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Old 03-18-2011, 06:52 PM   #15
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Useless POS.
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Old 03-18-2011, 09:25 PM   #16
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Who doesn't plan on boosting to 86psi???? If boost < 86psi then
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