throttle body coolant bypass mod? pictures
 

I found this articl at:
http://www.superhonda.com/forum/show...hreadid=126421

but i posted it here because i hate getting linked to a board where i have to register so here you go. would something like this work on my EF?


"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.

http://www.imagestation.com/picture/...9/fa79ea7b.jpg
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.
http://www.imagestation.com/picture/...0/fa79ea78.jpg
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:
http://www.imagestation.com/picture/...1/fa79ea75.jpg
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:
http://www.imagestation.com/picture/...5/fa79ea72.jpg
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.

Re:throttle body coolant bypass mod? pictures
 

yeah, it works, but i wouldn't do it if you live somewhere where it get pretty cold out. the coolant running by you tb helps warm the car up, you don't get much from it, but hey, if your scroungin for like and extra pony or two, go for it. you might get a cel, i don't remember :-\

Re:throttle body coolant bypass mod? pictures
 

---- that. summer time mod i guess.

Re:throttle body coolant bypass mod? pictures
 

Hate to hijack...

I did this like 3yrs ago on my Accord.. and I live in Iowa (so it gets COLD). No warmup problems here! I also removed all of this from my 95 DX and its had zero problems with subzero starts this year.

I removed the whole FIV assembly and jbwelded in the passages where it once was. I also dremeled all the old line outlet/inlets off the termostat housing and filled them in with JBweld (hey i love this ----) so you couldnt tell anything was missing. Also I hate 'looping' ---- .. just too ghetto for me. I sold the car 3mo ago and its all still holding together... lasted 3+ years now.

http://dolemite.dyndns.org/albums/albun24/MVC_003F.jpg

missing the 2-3 water outlet/inlets.

http://dolemite.dyndns.org/albums/al...0004.sized.jpg

hard to see but.. if you look close you can see the FIV is missing off the bottom of the TB

Re:throttle body coolant bypass mod? pictures
 

Ive done this mod and it worked good, you can actually feel a difference. In my 88 accord i bypassed the tb line, the eacv lines and the coolant line thru the middle of the intake manifold. I needed fast idle valve because if that isnt heated it idles at like 2k... ick

Re:throttle body coolant bypass mod? pictures
 

Hmm, if you delete the coolant lines on the secondary idle air control valve the idle may not bounce right away.. but give it time.. guarentee, every car I did that little trick to 92+ always had idle problems, the secondary IACV would always get fucked up. My ex's GSR use to bounce after that, my buddies EG coupe did, So what I did on my GSR Throttle body, was completely remove the S/IACV (cold start valve) and jb weld the holes shut. Now for EF users, this isnt a problem at all, because 88-91's dont have them (90-91 tegs do!)

Re:throttle body coolant bypass mod? pictures
 

So does that mean the great homemadeturbo god says it's a good idea? ???

Re:throttle body coolant bypass mod? pictures
 

i just don't think it's worth all the trouble, if you put a turbo on, you won't notice the 1-2 hp diff anyways.

Re:throttle body coolant bypass mod? pictures
 

I have zero idle issues with only the IACV... I'm not sure what problems you guys encountered. I also have the ability to control the duty cycle of the IACV via ecu... which I only have had to do when I put on the Y8 manifold.

And the above poster was right, thats why i totally blocked off the FIV including the port from inside the TB -> bottom of TB. Otherwise the wax never expands and its allowing mucho extra air into the intake tract.

Not withstanding the 0-1hp increase you might see.. I HATE hoses/wires/lines in the engine bay that I KNOW don't need to be there. I usually remove everything possible except for the AC (i love AC!) including the battery from the picture. So if you're ---- about your engine compt. like me.. the mod is a must.

Re:throttle body coolant bypass mod? pictures
 

my idle has always bounced in my accord when cold, i did not notice a difference with bypassed cooling lines, except when i bypassed the fast idle (wax) valve...