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Old 04-13-2006, 04:52 PM   #1
athakur999
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Arctic Silver

Default Throttle body coolant bypass = blocking flow instead of rerouting?

I'm thinking of doing the TB coolant bypass mod, but instead of doing the usual method of connecting the two ends of the hose together directly, put a valve on one side of the throttle body that you can open and close as needed.

Since there is still coolant in contact with the TB this won't be quite as good as bypassing it completely but since the coolant should be pretty static it shouldn't warm it up as much as before. The bonus would be it'd be very easy to "turn off" the mod if needed without spilling a drop of coolant.

Has anyone tried this? I found this diagram in the STi service manual (is the 2.0 much different?):


It doesn't look like blocking coolant flow at the TB would cause any problems.

Any ideas?
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Old 04-13-2006, 06:06 PM   #2
KmanRuffian
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Why don't you use two valves and two T's or Y's so you can re-route it to a bypass line or through the throttle body? Best of both worlds?

-D
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Old 04-13-2006, 06:45 PM   #3
orndog
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You're in Dallas, TX, why worry about needing to turn the flow back on? As outlined on my web page my car has made it through 0F without trouble. With a CAI.
http://www.utm.edu/staff/gonzalez/TBBypass.htm If you wanna see pics and such of it done on my OBS.
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Old 04-13-2006, 06:49 PM   #4
Don Arm
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I hooked up my water temperature sensor between the two hoses. Works great.
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Old 04-13-2006, 08:12 PM   #5
athakur999
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Quote:
Originally Posted by KmanRuffian
Why don't you use two valves and two T's or Y's so you can re-route it to a bypass line or through the throttle body? Best of both worlds?

-D
When I first started looking at this I thought about getting a Y valve. I know I've seen them for garden hoses but I didn't see one of this sized hose. But that got me thinking is there any reason to have coolant running through that line at all? There doesn't appear to be. Getting a splitter and then two valves for each split would do it but that's adding up on the parts cost.

As for living in Dallas, yes I don't have much reason to think about this But if I can spend $1.50 for the usual way or $2.50 for a maybe better way, I'd do the $2.50 way. Just I case I take the car somewhere cold or something
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Old 04-13-2006, 08:14 PM   #6
audio1der
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Why would one do this mod.....
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Old 04-13-2006, 08:27 PM   #7
athakur999
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Google for "throttle body coolant bypass". It's a pretty common mod for many cars. It can lower the temperature of the air going into the engine by a few degrees.
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Old 04-13-2006, 08:33 PM   #8
audio1der
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Quote:
Originally Posted by athakur999
Google for "throttle body coolant bypass". It's a pretty common mod for many cars. It can lower the temperature of the air going into the engine by a few degrees.
ty sir hmmm
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