quick coolant question

[wed3k]

are the coolant lines that go thru the FIV and IACV and all those valves on the intake manifold just used to keep the temperature down/high?

cuz...it just seems kinda weird to have colant going thru those valves? unless the sensors are dependent on the temperature on the coolant?

someone enlighten me please

[JaK FRoSTWhiTE]

Good question.

My guess is that the FIV needs coolant input to know when the vehicle has reached the desired temp.
You know how when you first turn your car on in the morning and its idling high, then as the Temp. needle goes up the idle comes down.

Anybody know the real reason?

[wed3k]

Good question.

My guess is that the FIV needs coolant input to know when the vehicle has reached the desired temp.
You know how when you first turn your car on in the morning and its idling high, then as the Temp. needle goes up the idle comes down.

Anybody know the real reason?

good point on the FIV

because i swapped my a6 plenum with a H23 one recently/TB and i didnt quite understand the instructions so using my common sense, i plugged the ones going from the thermostat one way and the receiving end was the ones going into the IM.

woks fine, except my FIV when cold is like 1300 and not 1500...not like i need it in this 70 degree weather.

[Mr. Evo IX]

Good question.

My guess is that the FIV needs coolant input to know when the vehicle has reached the desired temp.
You know how when you first turn your car on in the morning and its idling high, then as the Temp. needle goes up the idle comes down.

Anybody know the real reason?

I think when a engine first starts it needs a richer a/f mixture to run smoothly. The combination of water jackets in a manifold, temp sensors, ecu, etc enable modern FI cars to "choke" the engine for cold starts. They also provide cooling to the manifold and a consistant temp for the intake charge.. albeit probably hotter than it would be for maximum performance but good for fuel economy.

[trixxy_cb7]

I think when a engine first starts it needs a richer a/f mixture to run smoothly. The combination of water jackets in a manifold, temp sensors, ecu, etc enable modern FI cars to "choke" the engine for cold starts. They also provide cooling to the manifold and a consistant temp for the intake charge.. albeit probably hotter than it would be for maximum performance but good for fuel economy.

imho you need it. i tried it without the line and with. just leave em there. i doubt you'll even see 1 whp.