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Ryan
12-12-2008, 03:19 AM
I need the linky to the coolant bypass write up..

Can anybody help me out here?

ciento44
12-12-2008, 03:28 AM
http://www.ultimateresourceguides.com/content/freemods/toyota-celica-freemods.html

Ryan
12-12-2008, 03:34 AM
Thanks Ben.

CriScO
12-12-2008, 05:56 AM
http://www.celicatech.com/forums/showthread.php?t=34265

That's when I was helping a guy do it on his 5S, right after I'd done it on my 3S-FE. They aren't exactly the same, but very close.

Ryan
12-12-2008, 06:26 AM
Thanks chris!! That really helped!!

Ryan
12-12-2008, 06:58 AM
So basically i remove the 2 hoses from the TB, then connect those hoses together?

nuclearhappines
12-12-2008, 09:59 AM
yes

ciento44
12-12-2008, 12:45 PM
Easy peasy guy!

Ryan
12-12-2008, 06:04 PM
dont call me...Eh screw it, Im not even gonna start that.lol

ciento44
12-12-2008, 06:07 PM
Just do the mod and come back and tell us you gained like 40whp.

DaneDog311
12-12-2008, 09:36 PM
40 WHP I'm DOING IT TOO!!!!!!!

Ryan
12-12-2008, 09:39 PM
Dude, no, like 100rwhp easy!

Ryan
12-13-2008, 01:37 AM
Ok, I went to Autozone today, and I think I got everything I need to do it.

1. Something to hook the 2 coolant hoses together with. (I talked to somebody previosly and they suggested 3/8" brake line, that way you can cut it to size and bend it, plus its cheap)-$3

2. Vacuum line caps.(got a pack of 20, assorted sizes)-$3

3. Hose clamps(Screw type, 4)-$3

I will try to do a step by step on this.

CriScO
12-13-2008, 06:08 AM
Just do the mod and come back and tell us you gained like 40whp.
I think I got like 57 more horses. Still nothing compared to the stickers down my window, they're like a combined 200! :hehe: Ooh, don't forget my guages, they're like boost! :)

glenn
12-13-2008, 06:58 AM
so why does coolant run through the throttle body?

CriScO
12-13-2008, 07:18 AM
so why does coolant run through the throttle body?
Airc something about helping prevent the throttle plate from freezing.

Earlier yota's had a wax filled idle air control valve. The coolant would melt the wax as it heated, releasing a spring that closed the IAC when the car warmed up.

Starting with the fourth gens though, the IAC is electronically controlled. The water temp sensor sends data to the ECU, which uses that signal to control the IAC (among other things).

However, my idle on very cold nights this winter has been higher than usual... Makes me wonder if it's actually a combined effort.

So yeah, I guess that was a long ass way to say "I can theorize, but I'm not exactly sure." :)

DaneDog311
12-13-2008, 01:52 PM
I thought it was to raise ambient air temperature on colder days to help the car warm up to operating temp quicker... i coulda swore i read that somewhere while i was researching this... throttle plate from freezing sounds logical too though..

hey 92 rather then clamping 2 lines together... why not reroute one line to the other lines source? definitely look cleaner...

Lonestag
12-13-2008, 02:46 PM
I thought that line delivered warm beverages to the TB in cold weather conditions.

Actually, I also have heard that the lines are to make sure the TB doesn't freeze in really cold weather. If you are really tricky, you could buy two Y valves (not sure on the actual name). and make so you could switch the bypass on for warm weather and switch it so ran through the TB in cold weather.

Ryan
12-13-2008, 05:20 PM
I thought it was to raise ambient air temperature on colder days to help the car warm up to operating temp quicker... i coulda swore i read that somewhere while i was researching this... throttle plate from freezing sounds logical too though..

hey 92 rather then clamping 2 lines together... why not reroute one line to the other lines source? definitely look cleaner...


What do you mean?

Schmleff
12-13-2008, 11:42 PM
It keeps ice from forming around the butterfly in the winter. The pressure drop causes a temp drop right behind the butterfly. You stand to gain about .1 hp and increase your chances of icing it up in humid weather just above freezing.

bling bling baby, add some stickers instead...

Ryan
12-14-2008, 02:48 AM
Ok, I went ahead and did it.

Here is what I used..

1. I got some brake line(3/8" 8" of it) and cut the flared ends off with a pipe cutter.

2. 2 hose clamps (I like the screw type better than the spring type)

3. 2 vacuum caps


Tools needed-

3/8" ratchet

12mm socket

3" extension

Flat blade screw driver

Pliers




The first thing i did, which made it a whole lot easier was remove the throttle body, which was held on by 4 12mm bolts.

1. Remove intake tube

2. Disconnect throttle linkage and 3 vacuum hoses on top of the throttle body.

3. Disconnect TPS which is located on the back of the throttle body

4. Disconnect IACV which is on the bottom of the throttle body

5. Remove 4 12mm bolts, one on each corner of the throttle body.

6. Disconnect both coolant hoses( there are 3 hoses connecting to the bottom of the throttle body, the 2 outer hoses are the coolant lines, and the center one is a vacuum line)

7. Remove center hose on the bottom of the throttle body.

8. Place brake line, or whatever you want to use to connect the 2 coolant hoses together and tighten clamp down.

9. Place the caps where you removed the coolant lines from.

10. Hook back up the vacuum line, and reinstall throttle body, plug in TPS, IACV, Torque bolts to spec, reinstall throttle linkage, Vacuum hoses on top of throttle body,Intake tube, and intake air temperature sensor.

After you reinstall everything, check for coolant leaks.

The total cost of this project was approximately $9.

Brake line- $3

Caps(pack of 20)- $3

Clamps(pack of 4)- $3

I think there will be a more noticeable affect in the warm weather, but since it is so cold out, I really didnt notice a difference. It didnt seem to take any longer to warm up or anything.

It took me about half an hour to do this.

DaneDog311
12-14-2008, 03:17 AM
well one line was feed and the other was return... rather then take two lines and make it connect to one... why not use just one? that was what i meant... :)

Ryan
12-14-2008, 03:19 AM
Oh, i gotcha. Well it was more of a pain to do that... I might some day, but it was really cold today when i did this.lol

Freshnicity
12-16-2008, 02:13 AM
So i did the coolant bypass on my 92 ST, all went well, except now its idling high, like almost 2krpm's high. And when im driving it, and put it in nuetral while the cars moving, the idle shoots up and down from 1k-2krpms, then when i come to a full stop, it stops at 2krpms.

How do i fix this stupid issue?

CriScO
12-16-2008, 05:41 AM
So i did the coolant bypass on my 92 ST, all went well, except now its idling high, like almost 2krpm's high. And when im driving it, and put it in nuetral while the cars moving, the idle shoots up and down from 1k-2krpms, then when i come to a full stop, it stops at 2krpms.

How do i fix this stupid issue?
Did you cap every line you removed?

Freshnicity
12-16-2008, 06:09 AM
only removed two and yes i did, still no luck

CriScO
12-16-2008, 06:56 AM
Hm, then excluding another vaccum leak I'm out of ideas.

Schmleff
12-16-2008, 02:17 PM
The solution is to use some type of TB heating system. : )

I don't knock this cause I have not tried it. We did it to a number of 5sFE engines with stock and enlarged TB's and saw no results. You will get more by smoothing the small steps inside of the tb. I have some detail picts of the work we had done.

RedRkt01
12-16-2008, 02:36 PM
For those of you in colder climates this mod will give you serious headaches in the winter months if you don't take some sort of precaution to heat the TB. I learned about this in flight school. Pilots can choke an engine this way when approaching to land because ice builds up right behind the throtle plate, as already discussed. Interestingly, this can happen at temps as high as 70F with visable moisture in the air.

jaydog82
12-16-2008, 08:53 PM
i did this and it worked for a wile, but in the cold my rpms shot way up so i undid this mod.

Ryan
12-16-2008, 09:00 PM
it really didnt affect my rpms much, and i did it on a day when it was like 20* outside.

Freshnicity
12-16-2008, 09:06 PM
undid the mod.

car runs better now lol, well same as before i did the mod.