Here, the dyno shows a 6.3 horsepower and 7.1 ft/lbs torque difference
between having coolant run through the throttle body and bypassing it, with an average gain of 5.6 horsepower
and 6.8 ft/lbs torque. I made the first test after driving the car for approximately 15 minutes. I monitored
Coolant Temp and Intake Air Temp while making the run. At the beginning of the baseline run, the coolant was at
178F, intake air was at 80F, and the throttle body itself had a surface temperature of 102F. After bypassing, I
again brought the car to temperature and repeated the test. This time, the coolant was at 180F, intake air was
80F and the throttle body was at 82F. To make sure the runs were accurate, I set the cruise on the dyno to 70mph
in 6th and let the car run for about 6 minutes. After this time, the throttle body had reached 100F. I let the
car cool to 185F coolant temp, and 88F intake air temp. Running the car again with these elevated heat readings
yielded another .2 horsepower and -.2 ft/lbs torque compared to before heat soaking the engine. Check
out the Dynojet Race Routine between the stock vehicle, the stock
throttle body coolant routing and bypassing the throttle body coolant.
Everyone, including myself, thought this mod would be almost useless. Boy were we
wrong. It is a noticeable gain, but again, due to the low percentage, I can't feel it. Oh well. Want to do this mod yourself? Click HERE for the instructions (Thanks To Brent Franker)!