Quote:
Originally Posted by Gixstars
a nooby question. What is the purpose of the coolant bypass? why do it? what happens if you don't do it? what happens if you do it? ty all
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Honda runs coolant to the throttle body in order to make absolutely sure you can't get any sort of icing in the area. Ice near the throttle plate *could* crack off and cause damage downstream (possibly valves). The second, more realistic possibility is that if you were driving in the right conditions you could get ice to form where it could keep the throttle from closing when you take your foot off of the gas, essentially causing a runaway engine. To get this you would need a perfect combination of air temperature and humidity which I think is nearly impossible to have.
That being said, there is still *some* controversy regarding doing this here but many members have been doing it on the K20Z3 for a while and have done it on other cars for many, many years.
That being said (again), I have done the coolant bypass on my throttle body. If I'm ever concerned about the slim possibility of icing in the winter time then I will reconnect the hoses (takes maybe 10 minutes) and I'm back to stock.
To me there seems to be no point in trying to get cooler, more dense air to the engine by using tricks such as a CAI or using the intake manifold gasket if you are still heating the air at the throttle body. In theory you should see a slight decrease in MPG doing this since WARM air often better for fuel economy but I can't say I've seen any change. I get exceptional fuel economy.