BCS for ECU controlled boost
#1
BCS for ECU controlled boost
I have searched and apologize if it been covered already but would like to know if the Gruppe-s 3 port selenoid could be used in place of the GM BCS? I was hoping for a plug-n-play affair that the GM BCS route would not offer. Any help would be great especially some technical explaination. Thanks.
#3
Great. Thanks GST. Do I even need a new BCS? After looking at mrfred posts I am thinking I only need the Evo X MAP sensor and larger restrictor pill. By the way looking forward to coming out to GST this summer for a tune. Trying to get ducks in a row before I come to you. I apologize if this is newbie stuff. Thanks.
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#13
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Also on the GM, is the inline resistor really necessary? There seems to be conflicting info out there.
FYI, Rock Auto still shows the GM BCS for $48.
Thanks,
John
#14
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The GM BCS has a resistance of about 24 ohms. The standard has been to run a 10 ohm resistor in series to match the normal resistance of the stock BCS (about 35 ohms). In my bench testing, a 5 ohm resistor makes a significant improvement in performance over a 10 ohm, and running no resistor is still better yet. The problem is that no one is really sure how much current the relay in the ECU for the BCS can handle. The resistance tolerance range for the stock BCS is from 29 ohms to 36 ohms. This means that a 5 ohm resistor is a safe option as well. razorlab (aka GSTMotorsports) knows of people running trouble-free for over a year with no resistor.
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I've installed a ton of GM's with no resistor that have been running for over a year with no issues, some almost two years at this point and under heavy use (track use)