My question was related to both the right location to tap the MAP sensor as well as for the boost control solenoid. My FI project will be a track car with little if any street driving, if that makes a difference to those of you with more turbo experience providing input.ΔΆ. Thanks for the input guys, this is great stuff. You do NOT want it calculating based on the wrong signal. This HAS TO be installed on the intake since it's the ECU's reference for fueling and boost control. This is all academic here anyway since the OP stated he was asking where to plumb the MAP sensor. I run this exact arrangement on my own car for a reason. Boost overshoot shouldn't be a problem as long as the wastegate is the right size for the application. This increases the amount of energy put through the turbine versus diverted around it during the critical boost building phase, resulting in faster spoolup. The slightly lower pressure at the manifold being fed to the wastegate (in a conventional, non-EBC setup) will keep the gate closed slightly longer as boost is building. You will also get faster response (time for the manifold to reach full boost) by referencing intake manifold instead of the compressor outlet. That just means it will absolutely not open the gate when you are at low load, which is good for pumping efficiency. There is no problem with having the wastegate see vacuum when you are off throttle. And you also will get faster response and less boost overshoot.Completely false. For one, you don't want to see vacuum at the waste gate.
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