Holley Terminator X Boost Control: Full Setup Guide (Wastegates, Onboard Air, MAC Valve & Tuning)

Unlock precise and reliable boost control on your racecar or high-performance street car with this comprehensive guide to setting up your Holley Terminator X! Join Chuck and I from High Noon Racing as we walk you through every step of installing and configuring a complete electronic boost control system on our 1999 Pontiac Firebird project, "Scoots."

👇 TIMESTAMPS / CHAPTERS:
0:00 - Introduction to Holley Boost Control
[1:15] - Wastegates & Base Pressure
[1:55] - Designing Your Onboard Air/CO2 System (Parts Breakdown)
[2:38] - MAC Valve Selection & Plumbing Strategies
[5:40] - Understanding External Wastegates
[7:15] - How I Have Everything Plumbed
[9:56] - Wiring Your MAC Valve to Holley Terminator X Outputs
[13:58] - Holley EFI Software: Configuration for Dome Pressure Boost Control
[15:48] - Holley EFI Software: Setup Dome Pressure Sensor
[17:46] - Holley EFI Software: Mac Valve PID Settings
[18:42] - Holley EFI Software: Mac Valve Outputs + / -
[19:44] - Essential: How To Test Boost Control and Dome Pressure Easily


This in-depth tutorial covers:
✅ External Wastegate Plumbing: Correctly routing lines for optimal control with single or dual wastegates.
✅ Onboard Air System Design: Components, plumbing, and considerations for CO2 or compressed air.
✅ MAC Valve (Boost Control Solenoid) Integration: Proper plumbing (3-port & 4-port explained) and wiring to your Holley ECU.
✅ Holley Terminator X Software Configuration: Step-by-step I/O setup, open-loop boost control tables (Boost vs. Duty Cycle), setting solenoid frequency, and crucial overboost safety parameters.
✅ Boost Leak Testing: How to build a tester, perform a thorough test, and identify common leak points.
✅ Initial Tuning & Verification: Safely bringing your boost control online and verifying wastegate spring pressure.
Whether you're running a turbo LS, Coyote, or any other boosted application with Holley EFI, this video provides the detailed information you need to get your boost control dialed in. We share our experiences, common pitfalls to avoid, and best practices for a reliable setup.

🛠️ PARTS & COMPONENTS USED/DISCUSSED
Onboard Air System:
$170 VIAIR 1.0 Gal Kit: https://amzn.to/4ktAHU3
$399 VIAIR 2.0 Gal Kit: https://amzn.to/4dQtSJJ
$13 1/4" NPT Air Compressor Regulator: https://amzn.to/4kHuZO7
Sensors & Reference:
$16 Dome Pressure Sensor (100 PSI): https://amzn.to/4kGgZnA
$17 Boost Reference Block: https://amzn.to/4kmI4g5
Plumbing - Hoses & Fittings:
$11 Boost Block Fittings (1/4 x 1/8 NPT): https://amzn.to/4mFMosi
$17 Hose and Fittings Kit: https://amzn.to/43wYvR7
$14 More Assorted 1/4 ID Fittings: https://amzn.to/4jpm2YR
$17 50ft 1/4 Nylon Hose: https://amzn.to/4dK6ddW
Boost Control Solenoid & Wastegate:
$34 3-Port MAC Valve: https://amzn.to/4dBzwza
$109 VSR 44mm Wastegate Gen2: https://turbo4less.com/product/vsr-44...
Other Reliable Sources:
Sensors, Fittings, Kits: lowdollarmotorsports.com

🧠 HOLLEY EFI - PID SETTINGS & DOCUMENTATION:
Example MAC Valve PID Settings (Closed Loop - Start Here & Tune):
P (Proportional): 1.25
I (Integral): 2.0
D (Derivative): 0.5
Holley Manuals & Diagrams:
Dominator & HP Wiring (See Page 27): https://documents.holley.com/techlibr...
Terminator X & X MAX Wiring (See Page 27): https://documents.holley.com/techlibr...
Additional Holley Info:
Boost Control Overview: https://documents.holley.com/techlibr...
Boost Control Setup Details: https://documents.holley.com/techlibr...
General Pin Map: https://documents.holley.com/techlibr...
How to Find YOUR Holley ECU Specific Documents:
Holley Support Instructions Page: https://www.holley.com/support/instru...
Find Your Terminator X Kit Page: https://www.holley.com/products/fuel_...
Holley Support Resources Page: https://www.holley.com/support/resour...

#HolleyTerminatorX #BoostControl #WastegateSetup #MACvalve #HolleyEFI #TurboTuning #DIYAuto #RacecarEngineering #EngineManagement #LSswap #Firebird #Viair #LowDollarMotorsports

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