This Civic Si is also lighter and stiffer than its predecessor, though Honda doesn't specify exactly by how much. Adaptive dampers with Normal and Sport settings are standard, as is a helical front limited-slip differential. The Si also shares its front upper control arms with the ultra-hardcore Civic Type R.
The seats in both vehicles were cloth. RESULTS Within 20 minutes, readings in both cars exceeded 125 F and reached a maximum stabilized temperature in 40 minutes (Figure). The temperature rise in the first 10-minute interval was more severe for the dark-colored enclosed sedan than for the light-colored minivan. The maximum stabilized temperature was also higher for the dark enclosed sedan (140 F compared to 138 F), which was a temperature rise of over 45 F in less than 1 hour.
During hot and cool driving the thermostat will open and close as you drive to regulate the engine coolant temperature. Thermostats are made to open at SET temperatures.. The O.E. thermostat of the 4XE1-T engine is 180F/82C !! Thermostats usually last about 60-70,000 miles. They usually fail in the closed position which traps the coolant within the engine with no way to circulate to the radiator.