FTO AUSTRALIA

What would happen if I disconnected the water hoses to the throttle body?

The water hoses connect to the 'Fast idle air valve' to which the Idle Speed Control (ISC) servo is connected.

Now from what I can figure reviewing the manuals, the ISC is not controlled by the temperature of the water passing through the fast idle air valve, but by the temperature from the engine coolant temperature sensor.

So if I disconnect these water hoses, will the ISC still operate normally?
But the question is what does the fast idle air valve do then?

why??

I take it you want the throttle body to stay cooler so you have colder air going into the engine.

Even here in frosty UK the people I know who have done it saw no difference in performance.

Actually 2 reasons, potential heat soak to the intake plenum which over a 1 hour race at constant W.O.T. may make a small difference, I'm also going to try one of the insulator gaskets for the same reason, but also to get rid of some hoses to make working on the engine easier and less of a pita! Taking off a hot intake manifold when you also need to disconnect hot coolant hoses is not a lot of fun

I agree though I don't expect to see massive performance gains, but every little bit, no matter how small, helps

Let me know how you go with the thero gaskets
Might do the same thing down the line are you going to port and powder coat the intake manifold

bduffman wrote:Let me know how you go with the thero gaskets
Might do the same thing down the line are you going to port and powder coat the intake manifold

Port yes, but not yet, that'll be later next year, still too many other things to do...