HOIST the one thing about the Thunder Max auto tune is it has WIDE BAND O2 sensors not narrow band like most of the other systems on the market. What that means is it is constantly tuning the ECM. The narrow band units only tune when the sensor reaches a certain temp. Meaning it will open and cloe the loop at various times. I would much preder this over the SERT. Not to mention the adjustment points the T max has over the Sert. The Tmax has over 1900 adjustment points as oposed the less than 200 for the Sert. That will give you better driveability and better tuning.
Be Safe
THE DAWG
narrow band o2 sensors start to and continue to work once they reach a temp of 200 degrees "C". but they are "narrow " band because they can only tell the ECM if the fuel ratio is above or below 14.7:1. they are an "on" - "off" sensor. The fuel ratio is never static when they are being used to make adjustments....rather , it's always rich-lean-rich-lean, just above and below the 14.7:1 target...its a continous average so to speak. Each time the ratio goes just above or below the 14.7;1 target...is called a "cross count" The ECM is programmed to monitor the sensors for fuel control only during idle and periods of steady state cruise conditions...other times it just ignores them and delivers fuel based on the internal map..but they are always delivering the "yes"-"no" signal. The motor is then in closed loop only when the ECM wants and uses their input...since it "knows" that under a load or an acceleration event the sensor will be fixed on the rich side above 14.7:1....but cant tell by how much.
5 or 7 wire heated wide band o2 sensors know the amount of oxygen left in the exhaust stream at all times, under all conditions so an engine controller can use their input from idle to wide open throttle and every place in between.
The T-max is a good system...for sure... but it has to have 1,900 points of adjustment,because it is not load based (ignores the MAP Sensor) and has to constantly compute engine load ,off of the T.P.S. and RPM rate of change.
If it were to use the MAP signal....it would have 200 some odd cells like the SERT.
Then we are talking a closed loop controller that would be much more expensive....different technology.