3 Port Boost Control

Can be integrated with direct boost control

Original Thread [here]

Risks: While this solution is fairly straightforward it is very possible for you to screw something up. Too high of duty cycles or lines that are not arranged properly will cause boost overshoot and possibly cause serious damage! If a solenoid fails and you are using the interrupt method generally used with a 3 port (stock is bleed-type) you run the risk of overshoot also. Most solenoids will fail in their normally open (NO) position, but it is possible for one to fail in its normally closed (NC) position. Please take this into consideration when doing this mod!

Installation

What you will need:

• The ability to tune your ECU. IMPORTANT! You MUST reduce your boost tables before your first drive. If you do not you will overshoot and serious damage may occur!

• A compatible 3 port solenoid. Known Solenoids include (but are not limited to):

Known Compatible Solenoids

Make	Part # (if applicable)	Similar to
AC Delco	214-474, PT374 (pigtail)	GM
GM	[1997152], 12102747 (pigtail)	AC Delco
Perrin	EBCS	INGERSOLL-RAND
INGERSOLL-RAND	[P251SS-012-D]	Perrin EBCS (coated, comes with fittings, possibly other mods)
AEM	#30-2400 or Tru-Boost part	Mac Valves (below)
MAC	36A-AAA-JDBA-1BA	AEM
MAC	36A-AAA-JDBA-1GD	AEM (extra connector on solenoid and LED indicator)
Tactrix	PD3PBCSM	None

• A way to connect the solenoid to the stock wiring. Some people use simple crimp ons, some use vampire clips (not recommended!) or solder the the OEM harness. The Tactrix Solenoid is PNP. GST motorsports was rumored to have connectors at one point, but this cannot be confirmed. You can also harvest the AC Pressure sensor off of many common DSM (or mitsubishi in general) including the evo for a PNP solution (see [here], [here], and [here] ).

• A resistor for any of the non Tactrix Solenoids. This piece is debatable, but the original reason is to prevent the ECU from sending too much current and causing damage to the solenoid or ECU itself. This has been confirmed to work on the GM and AEM/MAC solenoids.

Flash your ECU

Reduce all of your Max WGDC (sometimes called Base WGDC) tables to 50% to prevent overshoot. Then see a tuning guide for how to tune your boost when you are finished with the install.

Install the Solenoid

Wire orientation should not matter. Install the resistor in line and solder your connections or create a PNP connector.

Tune

Then tune, tune, and tune again until your tables are spot on! Enjoy increased boost holding capacity and control.

Also, when using this method it may be a good idea to raise the values for BCS de-activation RPM. Stock these are set to 7500. If you reach 7500 RPM on throttle your WGDC will jump to 100% with these values. Raise them above your rev-limit to have them continue to interpolate to that RPM.

Be careful and make sure your XML definitions are correct before modifying this value. This table is often defined incorrectly.