Throttle Body Bypass

[JSM1284]

Originally Posted by Arrow

I quoted the wrong guy.... I was actually mentioning it to mr ASE.

no worries

I never bragged about my qualifications, or even mentioned them. The other poster asked me to back up my "Claims" per my avatar.

[Myxalplyx]

Bringing this back from the dead.....

Besides all the stuff going on earlier in the thread, has anyone did this to their Gen 5 or 6 Camry? If so, what were your observations? A guy mentioned it in a thread I have in another forum so I will be doing this sometime this week. Read up a lot about it and will continue to do so.

I just want to know what have those people here that have actually done this (Not hypothesis or theories) experienced after doing this 'modification'. Thanks for sharing!

BTW: This thread is over 2yrs old but I did not want to start a new one on the same topic. Surely, there should have been some people that have done this by now.

[Myxalplyx]

Originally Posted by djkor

I also did this on the TRD to see if it would help out, but that was a mistake. I quickly connected the coolant lines back up. Surprisingly, the coolant lines actually keep the throttle body cooler on the TRD since it connects directly to the S/C which can get rather hot.

Interesting read! Thanks for the info. I have read that if the intake temperature is hotter than the coolant temperature, that it was possible for the coolant to cool the intake air temperature down to the coolant temperature.

Was looking for some data online where someone actually measured the throttle body temperature before and after it has been bypassed. Intake air temps are harder to read since you'd need something put inside of the throttle body or intake manifold to measure the incoming air. This is what I came across though about the throttle body temperature change -->

Originally Posted by chatterton
So I just bought a new 06' lancer ES and I've been looking for ways to increase HP without ripping a whole in my pocketbook. I decided to run a little experiment in regards to temperature difference. This is a before and after of temp difference on the throttlebody when doing the coolant bypass mod.

ALL TEMPERATURE READINGS ARE TAKEN AT THE TOP SURFACE OF THE TB.

Test conditions:
Temps taken using a Kessler ST652 INFRARED THERMOMETER

Outside temp is 70 deg

Temp at TB is 84.5 deg
Car has not been running but has been sitting in the sun for a few hours. So the temp degree difference is expected.




Control conditions:

Car is started and A/C is on high.
Hood is open.
Waited until temp guage on dash got to normal operating range.
Took temp reading with car running at normal operating temp.




Again car is restarted and A/C on high and hood is open.
Waited again until temp guage on dash got to normal operating range.
Temp after DIY coolant bypass test:




As you can see there is a difference of 23 deg. before and after the mod. So does it work? I'd say so. The temperature stayed fairly consistant with the temp of the TB that I took while the car was not running.
Some may debunk these crude test results as a true air temp reading was not taken and the fact that the car was not driven. However, as a simple FREE mod.

This mod does reduce the temp of the incoming air. Since heat is the enemy when it comes to making power I think I'll stick with it.

Jeff.

My DIY CAI.

http://forums.evolutionm.net/lancer-...ypass-mod.html




This still does not take the place of your personal experience with the DJKor so.

[Myxalplyx]

Originally Posted by djkor

Like I said, believe what you want to believe. Even feel free to believe yourself that it really makes a difference after you do it for yourself.

If you know anything about physics, you will know that air is a bad conductor of heat. With the small internal surface area of the throttle body, a difference in temperature of 23 degrees as quoted above is not going to be able to heat up the volume of air that passes through it significantly enough to reduce power.

Anyone who really thinks they are getting a positive gain out of this really should read up on how to properly modify a car for performance.

You go and get all 'physics' on me. Then say I'm believing in stuff like like I have pulled this out of some fairy tell land or something. I have only shared what other's have experienced and was asking for people's personal experience here.

For instance...how does physics explain this --->
http://www.lt1tips.com/lt1-dyno-graph.html
LT1 Throttle Body Dyno

The dyno shows a 6.3 horsepower and 7.1 ft/lbs torque increase on a stock 96 Trans Am.




Maybe that is just a random number perhaps or that person and the dyno operator didn't know what they were doing?!? Beats me!


I was asking if anyone had actually did that mod (You have) and what their experience was while doing this (You shared this). That's cool! However....I have been told the 'That won't work' and 'That will not gain you any hp/tq' speech before with the intake and exhaust too. I have dyno proof it works...on this engine....although on a vehicle slightly different. Same engine though! Been told going to lighter wheels won't help lower 1/4 mile times too, by some people. 1/4 mile times dropped again.

So just like you, I test these things but ask for people's experienced thoughts on them. What IF I do this mod and somehow manage to get a better 1/4 mile time or trap speed under similar conditions. Would you call it luck? Chance perhaps? I'm here to learn as much from the Camry peeps as I can. Love the v6 Camrys and was considering getting one but the wife wanted more utility so....

Maybe I just happen to get a slightly better 1/4 mile time than you because I keep believing in fantasies. Perhaps the track timers down under are a little more accurate than here in the states. Got me! I'll continue to learn as much as I can from you even if you keep belittling any type of modification I consider. I have a lot of respect for you and many other people in this community. My options are wide open and no tunnel vision here. I'll go back now to being the good student. You seem to know your stuff! I'll continue to play the 'Ricer, Fast & Furious' role. **Watching you**

[Myxalplyx]

Update! Instead of arguing about it, I just went out and did this 'modification' today. I did a write-up about it at a RAV4 site and just wanted to share with the community what was done. This is just in case you are interested in doing this, you will have some idea on what to do. I'm going to simply copy and paste what I posted at the other site. Have fun!

From: http://rav4world.com/forums/viewtopic.php?t=26051

Just want to share with some folks a modification they may consider doing if they are interested in trying to eek out more power out of their RAV4. It is not proven to work and it is not recommended if you live in a colder climate. People on the net call it the 'coolant throttle body bypass' modification.
It is said that coolant is routed to go into the throttle body and back out (Not in the air stream or intake) to heat the throttle plate up. What heating it up does is prevent the throttle plate from sticking in an open position in the event your vehicle is travelling with cold air constantly going through it. So people believe that removing or rerouting the coolant lines to not go through the throttle body will help keep the intake air passegway cool by not heating up the throttle body itself. Some people have dyno'd and have gotten results. Others have not noticed anything. I am always willing to try something new though. Please, do research on this through Google or another search engine and decide for yourself if this is worth doing. I am not an expert on these things.
First off, here is a picture of where the coolant is going into the throttle body and coming back out. The two rubber hoses that need to be disconnected are circled in red.

Be careful pulling the first hose out as coolant will spill out. It is always good to wear safety glasses and latex gloves to protect your eyes and hands. There is a clamp that holds bot of the rubber hoses in place. A pair of pliers should be good in removing these pieces.


Here is a picture of the two rubber hoses disconnected from the throttle body.

Take note of the two metal hose clamps that had to be slid back on the rubber hoses to disconnect them.
At this point, you have a couple of options. You can fully remove one of the rubber hoses then connect the other rubber hose where you disconnected the first rubber hose. Or, you may connect the two rubber hoses together. Doing either allows the coolant to simply route back to the engine. I chose to connect both of the rubber hoses for ease of re-installation and that I just happen to have a piece to use to connect them together.

The piece I used is this -->

It is a simple vacuum connector, used to connect rubber vacuum hoses. I won't not recommend anyone else using a vacuum connector with coolant because I simply do not know what the long term end result would be. I have never had a problem doing things like this in any of the cars I currently drive but that does not mean your experience will be the same. Use a hose connector that is compatible with coolant. If you must know though, the piece I used is a Vacu-Tite vacuum connector (Part #47310). It is size 5/16" X 5/16" or 7,93mm X 7,93mm for your metric lovers.

Here is a picture of how the vacuum connector will look like when you connect it to one of the coolant line rubber hoses.

Simply slide it in. The connector has ridges in it to prevent it from coming back out.
Here's a picture with both rubber coolant hoses attached.

Be sure to use the metal connectors in the green circle to secure the rubber hose on the vacuum fitting.
That's it! May be a good idea to cover up the inlet/outlet holes on the throttle body itself. This will prevent any dirt or other objets from getting lodged inside of the coolant passageways. L8Rs..

[Camry2NR]

Originally Posted by TRD VVTi

That's funny as hell!!! Not one single thing in your post is correct!

Yes, performing the throttle body coolant bypass will net a very small gain. You will never feel it and it might not even show up on the dyno.

Coolant being circulated through the throttle body is to warm it! It's not to cool it. This prevents icing of the throttle body.

When the vehicle is running the throttle body is actually cooled by incoming air. The throttle body doesn't actuallly get warm because it's mounted on a plastic intake manifold which insulates it from engine heat. Being insulated and having cold are passing through it all the time keeps it cool. However, having hot coolant running through it does warm the incoming air charge. Performing the bypass is helpful in keeping the incoming air cooler. You may get slightly more horsepower, but you may also get slightly less fuel mileage.

I have performed that mod on my Formula many years ago and will probably do it to my Camry once I get down south again.

Edit: If you aren't sure if my statement is true or not just do a Google search on "throttle body coolant bypass". I can't believe how many people post inaccurate B.S. every single day. Some even cite lame certifications or say "I've done it" as a basis that their reply is factual and correct. It's not that hard people! If you don't know what you're talking about, read and learn instead of passing along bad information to other people that want to learn the facts/truth.

TRD we haven't seen eye to eye in the past many times but that is just that. The past. I can admit when I am wrong and when others are right. I will back you with this info cause you are 100% correct with your answers concerning the TB bypass. That was the first mod I did to my engine when I started to mod my Camry. It has been that way since 2006 and I have had no problems with the mod even after installing the turbo system. I will take pics of my bypass and add it to this site if it will help. It is really simple.