Air Temp Sensor - ZR-1 Net Registry Forums

Fully Vetted · 05-29-2013

I have a couple of questions concerning the Air Temp sensor. I suspected that the previous owner had relocated the sensor and while at BG Marc Haibeck confirmed this but we were looking at other things and I failed to ask where it was located originally. I am assuming it's supposed to go in the port on the side of the air horn that is now plugged(circled). My second question is why would he have moved it to begin with? Is this a documented mod that is supposed to be advantageous?

Mr Blue · 05-29-2013

Moving it isolates it from heat soak when the engine is parked while warm. Until the air horn cools from air moving through it the spark and knock sensor tuning is less than optimum. Where yours is located is good. Under the car, in front of the air dam, is better.

David

XfireZ51 · 05-29-2013

Before people developed the ability to modify the calibration, changes were made to "fool" the ECM. Mid America sold TPS module that made the ECM think there was more throttle than actual, allowing you to go into PE mode sooner. Moving the MAT so that it was an IAT was another of these tricks. They tend to richer the fuel mixture. Converting the MAT into an IAT normalizes or makes the ECM input more consistent since the sensor is further isolated from the motor and the air temp stays more consistent. it doesn't vary as much due to heat soak and coolant temp ups and downs.

05-29-2013	#1
Fully Vetted Join Date: Sep 2012 Location: Rockwall, Tx Posts: 1,510	Air Temp Sensor I have a couple of questions concerning the Air Temp sensor. I suspected that the previous owner had relocated the sensor and while at BG Marc Haibeck confirmed this but we were looking at other things and I failed to ask where it was located originally. I am assuming it's supposed to go in the port on the side of the air horn that is now plugged(circled). My second question is why would he have moved it to begin with? Is this a documented mod that is supposed to be advantageous? __________________ _________________ 1994 AB/Grey #141 430 RWHP/392 RWTQ FBI Lyposuction / Secondaries relieved of duty / SW Long Tube Headers / Corsa Exhaust / FIC SS Injectors / MSD Coils / Lightweight Pulleys / Corey tuned B & M Shifter / Aluminum Flywheel / Samco Hoses / Shelby Series One's / C4 No Flex Frame Stiffener BBC - Bling By Carter: Custom ZR-1 Center Caps / Custom Plenum Plate / Air Box Knobs / TB Cover / Oil Filter Cover

05-29-2013	#2
Mr Blue Join Date: Feb 2013 Location: Tallmadge OH Posts: 116	Re: Air Temp Sensor Moving it isolates it from heat soak when the engine is parked while warm. Until the air horn cools from air moving through it the spark and knock sensor tuning is less than optimum. Where yours is located is good. Under the car, in front of the air dam, is better. David

05-29-2013	#3
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,708	Re: Air Temp Sensor Before people developed the ability to modify the calibration, changes were made to "fool" the ECM. Mid America sold TPS module that made the ECM think there was more throttle than actual, allowing you to go into PE mode sooner. Moving the MAT so that it was an IAT was another of these tricks. They tend to richer the fuel mixture. Converting the MAT into an IAT normalizes or makes the ECM input more consistent since the sensor is further isolated from the motor and the air temp stays more consistent. it doesn't vary as much due to heat soak and coolant temp ups and downs. __________________ [SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX