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DIY: TB Coolant Bypass

31K views 72 replies 31 participants last post by  MZ777  
#1 ·
First i will say that this writeup took longer than doing it, so it really is that easy. Make sure to undo the process before the winter months if you live in a climate that gets really cold.

Let the car cool as there will be a tiny bit of coolant that can leak out.

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:bowdown::bowdown::bowdown::bowdown::bowdown:
 
#2 ·
thanks im doing this as soon as i get back i even added this to my favorites!! :bowdown:
 
#3 ·
YW, I did the bypass yesterday, and today i tackled the phenolic spacer and r2c intake... wow what a difference.
 
#8 ·
Nicely detailed, can't believe this is just catching on.... I did this to mine over 2 years ago....LOL. Oh, the hose looped on the TB is unnecessary, there's nothing to block off except air.....
 
#9 ·
dont u need to put the hose back when winter comes?
 
#11 ·
thanks!
 
#15 ·
I did this on my gen and it's awesome!!!!

I just have one question. Why/How does this work lol
 
#17 ·
Coolant is hot, hot coolant used to run through the tb before you did this mod. Heating up air as it passed through. Its nothing crazy or very noticable but it makes sense in theory. The hot coolant is used to heat up the tb and prevent it from freezing in colder climates. So, if u store your car or live in a warmer climate, good to ho for bypass.
 
#18 ·
I live in Miami, FL so I'm good to go.

And I didn't notice more power, I just noticed that the throttle was way more responsive which is awesome for a free mod.

Should I take out the loop on the TB? I think if I do that it'll suck in that little tiny bit of air, maybe?
 
#19 ·
Also thanks for the explanation! I like to know why mods work how they work.

I was thinking that it would make the air cooler but I just wanted to make sure as I've never heard of doing this before.
 
#20 ·
The loop on the tb is just a channel for coolant to run atound the tb, its not gonna suck anything in, it has no communication with the intake
 
#21 ·
Cool, then I'll just leave it as is. Thanks again.
 
#24 ·
FWIW you will get below freezing at above freezing temps at the throttle plate. When there is a lower pressure point the temperature will drop. When under a high vacuum condition this cause the temp to drop below ambient.

And yes norther Illinois can get quite cold.

the worst case scenario is 100% humidity and right at freezing.
 
#28 ·
Just did mine this weekend, I dont feel any effect other than the throttle body area is cooler than normal. Combine this with an intake and a intake manifold spacer and then you should see some good results. Also been driving my car for a couple of days and no noticeable problems from doing this. Especially no excessive revving while idle like some other cars would get.
 
#32 ·
Has anyone done this on a 2013 3.8?