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Old 11-23-2005, 06:09 PM   #1
qhatherly
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Default Hydra Boost Control Problem

Hopefully someone can lead me in the right direction because im completely out of idea's at the moment. Most likely its just something simple i've overlooked like usual.

I installed my solenoid for boost control last night. I'm using the solenoid supplied by Hydra and my wastegate is external. Hydra EMS wired the outputs for it so i know that wiring isnt the issue. Before this i was getting 5psi which was what my wastegate was set at. Now i definately hear the solenoid, and boost is rising past the previous peak to 7psi now. Problem is, no matter what settings i change, i peak at 7psi. I've read a few walk throughs of hydra boost control so i've set my P to 175, I to 165, and D to 45. Boost control start rpm is low at 2400 just so that i know that isnt the problem. I'm using output 12, PWM 4 set to boost valve(%). Bost target is 12 across the board. I've tried all sorts of shapes for the PWM map, and i've also tried switching from PWM 3 to 4 for boost control (in case there were any discrepencies with other outputs). Are there any possible mechanical reasons for this? Any other settings that could cause this? Any help would be really really appreciated.
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Old 11-23-2005, 07:57 PM   #2
jblaine
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Guessing, but from what you described I would say you have a mechanical or settings/output problem that is causing your solenoid NOT to function. The change from 5 to 7psi could be as simple as the weather, etc.

That's what it smells like to me.
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Old 11-23-2005, 09:57 PM   #3
qhatherly
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That's what i was leaning towards at first but i can definately hear it. Also when I changed the PWM output and forgot to in the i/o settings menu the sound of the solenoid went away and boost stopped at 5psi again.
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Old 11-25-2005, 07:08 PM   #4
qhatherly
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anyone?
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Old 11-25-2005, 07:20 PM   #5
supermarkus
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No help from Phil on this? He was answering emails this morning.
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Old 11-25-2005, 08:19 PM   #6
bboy
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Quote:
Originally Posted by qhatherly
Hydra EMS wired the outputs for it so i know that wiring isnt the issue.
I would not assume this. I had a similar issue at one time and hooked a volt meter up to the solenoid leads and took the car out with meter taped to the wiper. No voltage ever registered, even on boost when it should have been active-->the solenoid was not getting a signal (ground).

I'm not sure how your solenoid is wired. It's hard to help you with something mechanical like this. The boost control solenoid output (ground) is 4th pin from the left on the middle connector, top row of pins (if clip is on "top"). That should be wired to your solenoid ground (since you do not have a normal pin in the ECU harness for the RS, I assume it runs direct).

For the STi the BCS output runs to ECU pin B9 (you need the ECU pinout to decode).
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