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DIY : RX-8 Throttle coolant bypass

February 23, 2010 · Print This Article

Many cars run engine coolant through the throttle body in order to warm it up so the throttle body doesn’t get filled with ice due to a mix of cold temps, humidity, and condensation. This is done because car manufacturers cannot design a car to work for “most” people, they are expected to make cars that work in any condition.

Lucky for almost all of us, we don’t live in subarctic locations… It’s a no brainer for anyone living in the south.

The throttle body’s purpose is to control the amount of air that goes into the engine. With 180-200 degree coolant running through it, we are essentially heating up the air moments before it goes into the engine.

Bypassing the throttle body is easy and should take about 5 minutes.

You will need a single 5/16″ barb that looks like this (buy it from home depot):

Two small hose clamps (any auto parts store will carry these):

And finally, you’ll need two 5/16″ vacuum caps (I initially bought 3/8″ and it was far too big):

Before you begin, make sure your car is cooled down, otherwise you risk getting burned if coolant splatters on you.

First, open the radiator cap in case it’s pressurized.

Next, look at the throttle body. On the top is a black hose…

Using pliers, remove the clamp, then pull out the hose. You may need a rag in case there’s coolant still in the hose.

Now do the same for the bottom left of the throttle body. This one can be difficult to get to. If you’re unable to remove the hose from the left side of the throttle body, you may have to remove the intake accordion hose to get access.

Attach the two 5/16″ vacuum caps to the throttle body where you removed the hoses. You may reuse the hose clamps to secure the vacuum caps in place.

Now dig behind the alternator and pull the lower coolant hose out..

Line up the bottom and top coolant hoses together, then cut the excess hose from the top coolant line using scissors.

Finally, secure the two hoses together using the 5/16″ barb and hose clamps.

The result of this is that the intake air isn’t going to be heated before entering the engine. You may find increase throttle response, and maybe slight horse power gains.

Copyright: rotaryinsider.com

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