EJ20G Throttle Body IACV Coolant Bypass - Subaru Impreza GC8 & RS Forum & Community: RS25.com
 
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EJ20G Throttle Body IACV Coolant Bypass
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Old 05-28-2011, 02:07 PM   #1
eastfreestyler
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Default EJ20G Throttle Body IACV Coolant Bypass

Well, summer is here and it's hot out.
I've been reading how it's one of the best and cheapest mod on their EJ20G out there. I'm planning to do it over the weekend

Anyone else want to tell me otherwise?
Feedbacks? especially the one who lives on the cold east coast area.

Thanks
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Old 05-28-2011, 02:59 PM   #2
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I had to do it on mine. I had to cut the fitting off the throttle body, it was where my fmic pipe needed to be. So I had no choice but to bypass it.

I've never had any problems in the winter.
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Old 05-28-2011, 03:25 PM   #3
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is there a DIY guide? i couldnt seem to find one
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Old 05-28-2011, 03:31 PM   #4
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I always thought replacing the stock ej20g with coil packs off a USDM is one of the best mods for the ej20g.

Very interested in seeing this mod.
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Old 05-28-2011, 03:39 PM   #5
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Bad idea if you ever have to drive the car in cold weather.
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Old 05-28-2011, 05:35 PM   #6
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Quote:
Originally Posted by 69subaru360 View Post
I had to do it on mine. I had to cut the fitting off the throttle body, it was where my fmic pipe needed to be. So I had no choice but to bypass it.

I've never had any problems in the winter.
That's really good to know, you're in PA so it's similar weather as me.
Do you have problem on cold start or idle
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Originally Posted by curtis View Post
is there a DIY guide? i couldnt seem to find one
I can make diy if anything, It's similar to the one in northrusalia.
Quote:
Originally Posted by JaeILV2 View Post
I always thought replacing the stock ej20g with coil packs off a USDM is one of the best mods for the ej20g.

Very interested in seeing this mod.
I know usdm coilpack conversion is the best to prevent future problems.
But this mod is the cheapest and can help cool down the car, esp in summer.
Quote:
Originally Posted by jdmflcl View Post
Bad idea if you ever have to drive the car in cold weather.
I'll just take it out in the winter if I come across any weird idle or cold start issues.
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Old 05-28-2011, 05:52 PM   #7
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-20F ambient temps with an open hoodscoop at 70mph on a car with no tb coolant bypass.

You'll be just swell
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Old 05-29-2011, 01:44 PM   #8
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Zip zero, nada no problems at all with mine. Starts and runs completely normal in subzero weather. If you really want to blow your mind I have big fmic on mine too so even lower intake temps.

Go to a hardware store, buy a 3/8 brass hose coupler. Take the hoses off the throttle body and connect them with the coupler. Done.

I only did it because I had to, my fmic pipes didn't clear. I don't think it will make a much of a difference if any.
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Old 05-29-2011, 02:12 PM   #9
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Wow, I just did the mod and my motor loves it. There's noticeable gain after the install on my test drive.

here's the DIY for others.

You need 3/8" doublebarb fitting and some new hose clamps if you want.

Take out your TMIC (self explanatory - no need pics for this)
There are 4 connections around throttle body and iacv (1-4 left to right)


You can see in this picture that 2&3 are connected together (you leave them alone)


Take out 1 and 4 (green arrow)
Hose 1

Hose 4

Connect them together

Install TMIC and check for coolant leak.
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Old 05-29-2011, 02:34 PM   #10
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I think I'll give it a try.
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