Some observations on the use of the underdrive pulleys after long road trip …
(1) The mileage gains netted by using theses pulleys were better than expected.
(2) During the traffic jam, doing only stop and go, 1 MPH speed, the alternator was putting out only 11.2 volts/ This low voltage caused the AC blower to provide diminished air flow ( the temperature was fine. ). Hopefully, my new overdrive alternator pulley will solve this issue.
(3) The coolant temperature elevated to 216 F, but could be reduced rapidly by revving the motor in neutral. This was monitored via my OBD II scanner. This elevated temperature caused no problems and was reduced to 192 F almost immediately upon the return to normal highway speed.
(4) The ATF temperature went to 180 F during the standstill. This also returned to normal ( 130 F ) after returning to highway speed.
I want to retest with the stock water pump pulley and see what happens with both the temperature as well as gas mileage.