longislandwrx

After changing oil and transmission fluid on my daily driver I still had a little energy left and decided to assemble my new ported throttle body.

I had previously sent the throttle body out to Grimmspeed to have it coated and ported. It came back dissasembled, cleaned and looking sharp. The charge for the service was $130 and seems very reasonable.

My first stop was to Ace to get replacement hardware in stainless to replace all the soft sensor screws and the bolts that secure the throttle body to the intake manifold.

If you are interested in doing this yourself the shopping list is:
4x M8x40 socket head cap screw (throttle body to manifold)
4x M8 lock washer
4x M8 flat washer

2x M5x25 socket head cap screw (IAC valve)
2x M5 lock washer
2x M5 flat washer

4x M4x12 socket head cap screw (map and tps sensor)
4x M4 lock washer
4x M4 flat washer

All these cost about $12

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I also took the time to clean up the IAC valve and motor, which gets a little grungy after a few miles. The o-ring gasket should be replaced as it will probably will be stretched out. About $6 from the Subaru dealer, pn 22659AA120

Replace all the bolts and torque them down to the following specs.

4 bolts holding TB to intake manifold = 15.9 ft/lb (22 N-m)
MAP sensor screws = 1.2 ft/lb
Idle Air Control solenoid valve screws = 2.1 ft/lb
Throttle Position sensor screws = 2.1 ft/lb
(thanks stage infinity)

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Some final thoughts...

I'm not going to be running coolant through the throttle body, so I drilled out the hose fittings which gives the TB a cleaner look, in my opinion it didnt make sense to coat the TB to keep it cool, then run hot coolant through it. This 818 is going to be a fair weather car so I am not worried about the IAC or the throttle icing up.

I also will not be running cruise control so I removed the additional cable track and spring and also shortened the spring rod. With the porting and chop job, it probably saved a few ounces off the final weight.

Thanks for reading. Have a great day.

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