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Old 05-05-2003, 04:07 PM   #1 (permalink)
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Throttle Body Coolant Bypass Modification DIY

cut and paste from my thread in the accord forum. this mod should work w/ pretty much any honda motor. and still hasn't caused me any problems. Those who live in colder climates may want to use caution doing this mod, or put it back to the stock configuration when the colder months come around. The pictures are from a 98 Accord but the coolant lines are very similar to other honda motors.

okay...this is pretty much a FREE mod. i know all you peeps out there like that...free engine upgrade....well this is pretty much an easy diy that adds about 2-5hp (i saw the dyno somewhere, but i forgot where).

There is a color code in the letters...red means you just totally disconnect those, blue you connect together somehow, and white is just a guide so you know where you are in the engine bay. Oh yeah, do this mod when your car has been sitting for a while, that way you don't spill hot coolant on yourself. You'll need needlenose pliers to remove the clamps and to pull some of the hoses off, and some coolant in case you spill too much.

I took the intake piping off so it would be easier to work with. Disconnect points A and B. The hose that came from A will connect to point C, and the hose that came from B, you just put aside. some hoses are easier to connect that others, so switch them around as you like just as long as you get point C to connect with point D.

Does the metal pipe at E look familiar? there's a coolant line that runs through there so i just moved it under the intake pipe. F is the main coolant line that runs back to the radiator. D is located just above F, near the block. The next picture illustrates that the best:

Once you get C to connect D using any combination of hoses, then you're pretty much finished. This is what the final layout should look like:


for your reference, the stock flow goes from A to B to E to D. Points A and B are input and output from the throttle body. we simply bypass those by adding the point C and connecting it to E. I have no clue how this mod adds power, but i know it does. I felt a slight gain after doing this, plus my gas mileage is slightly better. my engine temp gauge sits between 1/8-1/4 depending if it's cold or hot outside. normally it would of been at 1/4-1/2. so my guess is that the engine runs slightly cooler, thus adding more power. hell it works.

*Disclaimer*
This is only an article on what I've experienced. You may choose to do this modification of your own free will. I and SHO will not be held responsible for any mistakes you may make.
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Old 08-26-2005, 03:04 PM   #2 (permalink)
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any new link to the pics?
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Old 08-26-2005, 03:14 PM   #3 (permalink)
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fixed
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Old 08-27-2005, 01:36 AM   #4 (permalink)
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nice thanks
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Old 08-29-2005, 09:47 PM   #5 (permalink)
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What is the reason for having the coolant run through the TB?
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Old 08-29-2005, 10:02 PM   #6 (permalink)
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Quote:
Originally Posted by flyingtoaster
What is the reason for having the coolant run through the TB?

In colder climates, the coolant (heated) helps the throttle move. If there is nothing there to help warm it up, the butterfly may get stuck.
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Old 08-30-2005, 12:35 AM   #7 (permalink)
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Quote:
Originally Posted by GSteg
In colder climates, the coolant (heated) helps the throttle move. If there is nothing there to help warm it up, the butterfly may get stuck.


but here in sunny socal, there was no need for me to have that feature
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Old 08-30-2005, 06:05 AM   #8 (permalink)
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Yeah basically you have a hot engine and cold air coming through the intake on a winter day. You could possibly get enough difference to where the throttle plates metal would expand at different rates than the surrounding areas which could create some stickiness.

Otherwise if you live in cali,tx,fl. Your pretty much good to go year round and can do this mod no problems.

Ive yet to perform it, but the theory is good. Cooler intake charge = dense oxygen = more horsepower.
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Old 08-30-2005, 06:24 AM   #9 (permalink)
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so.. a and b get left open and you connect the tubes you took off into eachother?
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Old 08-31-2005, 05:16 PM   #10 (permalink)
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I think this was one of my first mods.
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Old 08-31-2005, 09:07 PM   #11 (permalink)
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i tried doing this but could'nt figure it out for my h, can anybody help me out?
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Old 09-09-2005, 11:16 AM   #12 (permalink)
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Old 09-09-2005, 11:57 AM   #13 (permalink)
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Old 09-17-2005, 10:01 AM   #14 (permalink)
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Going to try this out on the h22a, hopefully everything is the same as in pics above
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Old 09-17-2005, 10:12 AM   #15 (permalink)
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it's very similar in the h22. in fact, the directions i got this from was originally for a prelude. but there were no pictures. this was years ago, so i don't remember what site i got it from.

oh and not to mention i had it hooked up like this when i swapped my h22 in too.
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