TECH ARTICLE TECHApplication: DISCUSSIONEdelbrock Superchargers E-Force Boost Measurement (Installing A Boost Gauge Or Pressure Tranducer) 1. The TMAP sensor mounted on top of the manifold at the rear of the driver's side, outputs a 0-5 volt signal through pins 1 & 2 (pin 1 is signal & pin 2 is signal return,) that can be converted to an absolute pressure reading using the below calibration curve. Use of this signal requires an ambient pressure correction for calculating boost pressure. Voltage Pressure 0.62 2.70 0.80 3.69 1.09 5.70 1.40 7.69 1.71 9.70 2.17 12.70 2.46 14.70 2.70 16.21 2.94 17.70 3.25 19.71 3.55 21.70 3.84 23.71 4.15 25.70 4.46 27.70 4.76 29.70 2. The second option is to utilize the pressure port at the rear of the passenger side intake runner flange. Your supercharger has been pre- drilled and tapped for a 1/8" NPT fitting. There is currently a plug sealing the hole, which can be removed, and replaced with a fitting to adapt to your sensor. CAUTION: Never cut into the vacuum lines leading to the fuel rail pressure sensor and bypass actuator, on the driver's side of the manifold, for the purpose of tapping in a boost gauge. Interruption of the vacuum signal to the fuel rail pressure sensor can affect the fuel pressure reading to the PCM, which can result in engine failure! Furthermore, this port reads pressure before the intercooler, and therefore is before the inherent intercooler pressure drop. Readings from this port will always be approx. 20% higher then what the engine actually sees. If measured properly on an otherwise stock 4.6L Mustang GT, your boost readings, utilizing an electronic transducer or MAP sensor, on a dyno, should be comparable to this boost curve, shown below, collected from a recent dyno test here at Edelbrock. If you install a mechanical boost gauge in your vehicle, you will see a steady 5 PSI on the gauge during full throttle acceleration on the street. RPM Boost RPM Boost 2600 5.092 5100 5.862 3000 5.733 5200 6.085 3500 5.541 5300 6.278 3800 5.637 5400 6.278 4000 5.733 5500 6.342 4300 5.637 5600 6.502 4500 5.701 5700 6.663 4600 5.829 5800 6.950 4700 5.765 5900 6.950 4800 5.509 6000 7.272 4900 5.701 6100 7.336 5000 5.798 6200 7.559 MAMotorworks 17082 N. US Hwy 45, P.O. Box 1368, Effingham, IL 62401 Midamotorworks 800.500.1500 • Worldwide: 217.540.4200 • FAX: 217.540.4800 www.mamotorworks.com • [email protected] blog.autotainment.com ©Mid America Motorworks, Inc. All rights reserved..