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Old 02-16-2013, 08:56 AM   #1
WRBWRXWGN
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Default Boost controller question

So I'm putting in an HKS EVC 6 today in prep for a bigger turbo. According to the instructions it wants me to completely bypass the factory boost control solenoid. What I'm wondering is if I bypass the solenoid without immediately getting a tune, how much is my car going to hate me and also, what kind of feedback does the factory solenoid give the ecu (boost pressure/vacuum maybe I'm not sure)? I know I can leave it in the system for the time being if I need to, to just kind of act as a secondary measuring device. My car is a 2002 WRX btw
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Old 02-16-2013, 10:50 AM   #2
kellygnsd
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Why not just wait to hook it up then.
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Old 02-16-2013, 11:08 AM   #3
subie bro
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Quote:
Originally Posted by kellygnsd View Post
Why not just wait to hook it up then.
^ this.
Also if you bypass the bcs without a tune you will over-boost, which causes feedback knock which is no bueno.. Wait to get tuned and then ask you tuner.
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Old 02-16-2013, 01:50 PM   #4
SpongeBobSquarePants
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I would wait as well to install the boost controller. As far as bypassing the OEM ebcs, if you install the boost controller properly you would just turn the duty cycle down on the evc and you should under boost and then slowly add duty cycle until target boost is achieved. I'd keep the boost low until you are able to tune. Hope this helps
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Old 02-16-2013, 02:47 PM   #5
WRBWRXWGN
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Thanks guys, but what's most important to me is finding out what kind of feedback to the ecu that I'm losing if I bypass the factory boost solenoid. Also I was going to do it before the turbo, because the evc in and of itself is a hefty project for install to be done properly. I don't want to have to do the boost controller and the turbo in the same day
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Old 02-16-2013, 06:16 PM   #6
Black94Snake
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Quote:
Originally Posted by subie bro View Post

^ this.
Also if you bypass the bcs without a tune you will over-boost, which causes feedback knock which is no bueno.. Wait to get tuned and then ask you tuner.
Wait...what? Boost controller can't reduce wastegate pressure. With the BCS disabled, he won't make any more boost than the spring in the wastegate.

Overboost... Psh, you don't know what you're talking about.
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Old 02-16-2013, 10:18 PM   #7
BlazeRex
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He says bypass the BCS, not disable it. I think he means as in disconnect all the lines in the system...
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Old 02-20-2013, 10:05 PM   #8
WRBWRXWGN
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Originally Posted by BlazeRex View Post
He says bypass the BCS, not disable it. I think he means as in disconnect all the lines in the system...
Exactly. Thank you
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Old 02-21-2013, 05:28 AM   #9
jebjkey
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Disconnecting all the lines will disable the boost control system.


You can run a hose from the outlet nipple directly to the WG nipple. That will will give you WG spring pressure until you swap your turbo.
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Old 05-06-2013, 07:18 PM   #10
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Quote:
Originally Posted by WRBWRXWGN View Post
Thanks guys, but what's most important to me is finding out what kind of feedback to the ecu that I'm losing if I bypass the factory boost solenoid. Also I was going to do it before the turbo, because the evc in and of itself is a hefty project for install to be done properly. I don't want to have to do the boost controller and the turbo in the same day

i also want to know

or can someone link us to the right direction. i looked around with no luck
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Old 05-10-2013, 04:20 PM   #11
bcheck555
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Quote:
Originally Posted by pyrox View Post
i also want to know

or can someone link us to the right direction. i looked around with no luck
The solenoid provides no feedback.
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Old 05-10-2013, 04:36 PM   #12
Concillian
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The car will pop a CEL if the solenoid isn't plugged in (electrically). So it checks resistance.

That's the extent of how the ECU uses the boost solenoid feedback.

Wire everything, have the hoses ready, but run a hose from compressor nipple to WG nipple to be on spring boost, then hook it up when you get tuned.
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