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Old 11-06-2001, 01:05 AM   #1
LVSUBARU
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Default coolant flowing through throttle body

I am sure most of you know that Subaru has coolant flowing through the throttle body. That maybe fine for a N/A Impreza in Colorado, but I'm turboed in Las Vegas. So my question is, can I "plug" these coolant hoses or will that mess up the coolant flow through the motor? Should I just use a peice of aluminum pipe to reroute the coolant around my TB? If so, which size? Any info would be appreciated. I plan to do the very popular fuel mod this weekend, so I figured I would take care of this while I'm at it. Thanks.
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Old 11-06-2001, 01:13 AM   #2
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I just plugged the lines, and removed the lines in the TB
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Old 11-06-2001, 01:21 AM   #3
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I had to plug up those lines when I did the TB fuel injectors, and so far, knock on wood, I haven't frozen the TB open yet - not even in cold Colorado winters.

Larry
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Old 11-06-2001, 01:39 AM   #4
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What did you guys use to plug them?
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Old 11-06-2001, 01:50 AM   #5
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forget plugging them, just connect them together with a longer hose.

larry, did you do a write up on your injector in the TB?
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Old 11-06-2001, 02:03 AM   #6
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WHY ARE YOU GUYS REMOVING THOSE LINES??? I seriously hope none of you live ina climate that gets below 50degrees. Those are there to prevent throttle plate icing. I would reconnect them asap....and larry i would say you are VERY lucky you haven't frozen the plate yet.

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Old 11-06-2001, 02:15 AM   #7
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I live in Nevada were it doesn't get very cold. But what if the TB does ice, what can happen?
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Old 11-06-2001, 02:30 AM   #8
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I've been doing the TB coolant bypass on Vettes for years and it is perfectly fine for the engine. You don;t even need to plug the two holes in the TB. just get a piece of aluminum pipe and connect the two hoses together. We sell the kits but just do it yourself and save some money

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Old 11-06-2001, 02:32 AM   #9
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mcgyver has had his off for a long long time in CA weather and is a-ok. i forgot but IIRC he got it like that from the factory. maybe he can chime in and tell us the kind of weather he has seen.
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Old 11-06-2001, 02:35 AM   #10
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By the way, I've done this to cars in cold climates also and have never had a problem with icing. You really shoudn't worry about icing unless you live in sub 0 degree temp and drive for a long time. if that's the case. just hook the lines back up till it gets warmer.

The only adverse effect you will have is the car will not idle as smooth until the engine gets up to temperature but it is hardly noticable.

Here's a dyno graph from an LS1 Firebird. you can see the difference. 6hp and 7 ft/lb difference with only that mod




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Old 11-06-2001, 02:44 AM   #11
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woot
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Old 11-06-2001, 03:41 AM   #12
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I cannot re-connect the lines without removing the TB fuel injectors.

www.imprezars.com/sdsefi.htm

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Old 11-06-2001, 04:29 AM   #13
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you do that here youd freeze everything... it get to below 30 c here...

But what is wrong with coolant in the TB...? why would you remove it as HndaTch627 says...?

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Old 11-06-2001, 07:05 AM   #14
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Quote:
Originally posted by HOK
you do that here youd freeze everything... it get to below 30 c here...

But what is wrong with coolant in the TB...? why would you remove it as HndaTch627 says...?


Coolant in the throttle body can, and does, heat the incoming air flow after the engine has warmed up. This robs a little bit of power.



Charlie
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Old 11-06-2001, 08:46 AM   #15
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OMG i'm so running to the harware store this saturday morning

I'm gonna make a bypass system with a manual valve
g
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Old 11-06-2001, 12:05 PM   #16
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REmove this part *just so you remember this those power gains were with a 5.7 litre 350 Cu in small block chevy. On the same car with a K&N cold air kit you gain 19 RWHP.* Thought that said LT-1..my bad. That car is super restricted in the first place so don't assume you will see power gains like the ones demonstrated in that dyno chart.

Jeremy

Last edited by HndaTch627; 11-06-2001 at 02:39 PM.
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Old 11-06-2001, 02:21 PM   #17
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every little bit counts, especially when its so cheap to do like this.
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Old 11-06-2001, 08:25 PM   #18
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I just used some fuel line to connect the two block lines bypassing the TB.
Kevin
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Old 11-06-2001, 10:52 PM   #19
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giulio-I know you want to do a write up on this for me. I had no clue about this and want to do it. But winter is coming and in Michigan it's cold. If I had a valve to change it that quickly that would be awesome!!! Or if somebody just has a normal write up that would be appreciated too.
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Old 11-06-2001, 11:09 PM   #20
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It's really simple, no write up necasary. Just look at the throttle body.
K
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Old 11-07-2001, 09:27 AM   #21
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yeah it gets very cold up here too. below 0 sometimes up in the mountains. That's why i want to be able to turn it off and on at will.

It would be really cool to have a temperature operated actuator - automagically redirecting the flow. maybe i'll have to hit the electronics store too
g

i wonder if our gains would be of a higher % than on a bigger motor. Our TB's are smaller, so a greater % of air is being heated by the 'coolant'. I guess a bunch of us will find out.

Last edited by HRE | giulio; 11-07-2001 at 09:34 AM.
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