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Old 03-11-2009, 04:42 PM   #1
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Default Throttlebody Coolant Bypass

One of my friends was telling me that he did a throttlebody bypass on his MSM. Apparently the coolant runs throught the throttlebody to prevent it from freezing in severe cold weather. According to him by rerouting the coolant to bypass the throttlebody you're able to keep intake temps cooler. I tried searching for people doing that but wasn't able to find anything.

Given that I live in south Florida where it never freezes, and even if it did freeze I hate cold weather and my car has no top, no windows, and no heater so it certainly won't be leaving the garage if it's under 50 degrees, are there any drawback to doing the reroute? Is the coolant serving any other purpose than warming up air going into the motor?
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Old 03-11-2009, 05:00 PM   #2
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do it.
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Old 03-11-2009, 05:21 PM   #3
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what's colder: 190-210F coolant temps or 40-120F ambient temps?

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Old 03-11-2009, 05:27 PM   #4
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[QUOTE=Braineack;380467]what's colder: 190-210F coolant temps or 40-120F ambient temps?

So uhh, I did the math and it appears the ambient temps would be cooler.

Is 190-210 the coolant temps we're supposed to be running? Whoops. I gotta do something about the begi reroute!
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Old 03-11-2009, 05:28 PM   #5
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More specifically though, what is the easiest way to bypass this system? Just run the line that would normally go into the peice under the throttle body to wherever the out from the air valve on the manifold goes?
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Old 03-11-2009, 05:28 PM   #6
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and really the coolant only passes through the idle valve...
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Old 03-11-2009, 05:33 PM   #7
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Quote:
Originally Posted by pdexta View Post
what's colder: 190-210F coolant temps or 40-120F ambient temps?

So uhh, I did the math and it appears the ambient temps would be cooler.

Is 190-210 the coolant temps we're supposed to be running? Whoops. I gotta do something about the begi reroute!
After careful calculations I came to the same conclusion.

190-210 is high for a car with a nicely done collant system. Don't sweat it. I never hit 200 unless I forget to turn my fans on in stop and go traffic.
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Old 03-11-2009, 05:37 PM   #8
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Even if I had the most efficient cooling system in the world, I'd still want to operate the motor somewhere between 190-200F
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Old 03-11-2009, 05:57 PM   #9
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:shrug: I idle during the day at about 185 (180* thremostat) and doing repeated pulls on the highway get up to maybe 195* - all according to MS reading the stock sensor. My aftermarket water temp gauge who's sensor is in the upper radiator hose sees lower temps as that's right after cooling in the rad. At night, cruising/idling is just about flat 180*.. this is with just a larger koyo alum. rad and both fans on switches in the cabin so I can run one or both on demand.
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Old 03-11-2009, 06:03 PM   #10
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Quote:
Originally Posted by ThePass View Post
My aftermarket water temp gauge who's sensor is in the upper radiator hose sees lower temps as that's right after cooling in the rad. At night, cruising/idling is just about flat 180*..
Upper radiator hose is the return from the engine to the radiator. Coolant flows in to the engine from the radiator via the lower radiator hose.
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Old 03-11-2009, 06:09 PM   #11
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190-200* ftw!
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Old 03-11-2009, 06:14 PM   #12
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You are right I am wrong... not sure why I was thinking the flow was backwards. Anyways, having that sensor after the thermostat means it doesn't read until the water gets up to temp and then the thermostat opens, so if ever the thermostat was stuck, I'd know immediately b/c the stock gauge would be reading and the aftermarket one would not.
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Old 03-11-2009, 07:53 PM   #13
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One 11" spal and a big radiator kept my motor at 194-197 with no reroute. Reroute, one Spal and a 180 degree thermostat and I'm at 184-187.
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Old 03-11-2009, 09:52 PM   #14
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Quote:
Originally Posted by pdexta View Post
One of my friends was telling me that he did a throttlebody bypass on his MSM. Apparently the coolant runs throught the throttlebody to prevent it from freezing in severe cold weather. According to him by rerouting the coolant to bypass the throttlebody you're able to keep intake temps cooler. I tried searching for people doing that but wasn't able to find anything.

Given that I live in south Florida where it never freezes, and even if it did freeze I hate cold weather and my car has no top, no windows, and no heater so it certainly won't be leaving the garage if it's under 50 degrees, are there any drawback to doing the reroute? Is the coolant serving any other purpose than warming up air going into the motor?

Forgive my dumb question but; what did your friend do with the coolant line he was bypassing?
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Old 03-11-2009, 10:02 PM   #15
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i was told that the coolant flowing through the ISC valve is actually to cool it. so... cutting off the coolant flow could cause it to burn out.
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Old 03-11-2009, 10:11 PM   #16
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Quote:
Originally Posted by Rafa View Post
Forgive my dumb question but; what did your friend do with the coolant line he was bypassing?
There is one line going in the throttle body and one coming out. Unhook both of them and connect the lines. I did it when I got home from work today, took about 10 minutes and everything seems to be working fine, so apparently it works.
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Old 03-11-2009, 10:16 PM   #17
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pics?
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Old 03-11-2009, 10:18 PM   #18
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Quote:
Originally Posted by pdexta View Post
There is one line going in the throttle body and one coming out. Unhook both of them and connect the lines. I did it when I got home from work today, took about 10 minutes and everything seems to be working fine, so apparently it works.
Thanks.

+1 on pics whenever you can.
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Old 03-11-2009, 11:23 PM   #19
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Man, I can't help but feel like you guys are all just mocking me, telling me to do some dumb **** that no one in their right mind would do, then when I actually say that I do it you ask for pictures so you can take the mockery to a whole new level, and eventually it spreads all over the internet... I really hope I'm not "that guy", sigh...

I tried to take some pics, but it's hard to get a shot of. It's really one of those things that when you look at it, it's very very simple.



In the pic you can see the inlet on the throttle body and the hoses bypassing the throttle body. The outlet on the throttle body is behind the inlet (can't be seen in the pic). If you look at it on your car, it should be pretty self explanatory I think.
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Old 03-12-2009, 07:32 AM   #20
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Hey pdexta; thanks for the pics and...I'm in no position to mock anyone when it comes to things mechanical
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