6G Celicas Forums

So I have been thinking about working on my car again. So, I wanted to pick up where I left off.

I want to replace the cold start injector on the intake manifold, with a water injection nozzle. I would like to hear some opinions on my idea. I really do not want to drill into my intercooler. This would inject the water after the TB, I believe its recommended that the spray be before the TB.


I think I'm gonna pull my wiring harness and clean it up, Manny's thread has inspired me.

Your thoughts,

DEF

I have my injection before the TB, about 4 inches before it. I believe the close to the TB, the better.

yea..once art sees this i know he will comment on it but i know he has his nozzle about 2 inches right before the TB...seems like the most logical and functional place to put it...his set-up is preety sweet in the sence he can set the WI to come on when he wants..(ie) i believe he has it set at 10 pounds, so once he boosts past that it kicks the pump on and starts srayin...preet cool stuff..i know there are a couple threads about this with lots of good info in them

edit:

http://www.6gc.net/forums/index.php?showto...water+injection

there ya go def...hope that helps

This post has been edited by 95st-celica: Jan 9, 2009 - 5:15 PM

Probably best to see how manny/jim set it up on his 3rd gen motor.
Nozzle placement is a little tricky with that intercooler.

I saw that DevilsOwn recently came out with a special nozzle that can be mounted into a silicone or rubber coupler. Might be worth looking into.

This post has been edited by lagos: Jan 9, 2009 - 5:22 PM

hrmm i dont know if I have enough room for a nozzle in the rubber piece. I will have to see jim's set up.

This is taken from the Devil's Own website, link here. It probably doesn't answer your specific questions but I think it's good info for people who don't know much about water injection and are thinking of looking into it.


Where to locate your alcohol-water injection nozzle.

Well let's first start with where not to place the nozzle. When placing your water injection nozzle makes sure you do not place the nozzle upstream of a MAF or mass air flow sensor. Fluid running through this sensor can damage these sensors on some particular engines. Next we recommend not installing these pre-intercooler unless you are injecting pre-blower on a supercharged engine that has an intake mounted intercooler. Injecting before front mount intercooler can cause the water-alcohol mixture to collect at the bottom because of the restriction of the tubes. Okay, now we know where not to place the nozzle, lets get on to where to place it.
methanol water injection spots



Starting from where the air enters the intake tract and ending at the intake just prior to the combustion chamber.
1 Pre-Turbo water

We don't recommend this location at all if you do not have the proper equipment such as the proper nozzle, nozzle size and high pressure pump. Locating the nozzle here is the most controversial location. The majority of alcohol/water injection users do not use this location. One reason for someone to inject at this location is the water/methanol mixture chemically alters the turbo compressor map. The water/methanol injection will dynamically shifts the compressor map of the turbo so that it has the compressor map exhibits the characteristics of a larger turbo. This sounds great but, the main issue with pre-turbo nozzle placement is what mixture can damage the compressor blade if the mixture is not properly atomized when passing through the turbo.

In order to inject pre-turbo with out compressor damage you need a high quality low volume nozzle and high enough pressure to get the water as finely misted as possible, and the smaller nozzle which allows for smaller/finer water droplets. We recommend you mount the nozzle as close to the compresser as possible.


2 Pre-Intercooler

Pre-intercooler seems like a sensible nozzle location but, the thing to think about is if the air entering the IC is pre-cooled, the ability of the intercooler is because the temp difference is lesser. It is also possible for the fine water/alcohol mist to collect in the bottom of your intercooler core. We don't recommend this location either. The other problem is that there's a possibility that the hot air from the turbo might unnecessarily vaporize the water and take up some of the volume built up by the turbo that was supposed to be for the charge. Pre-IC does work for some track cars such as road racing that operate at a more constant higher RPM. For the daily driver, weekend racer, the pre-intercooler location should not be considered.


3 Post Intercooler

Most computer controlled engines have an intake air temperature (IAT) sensor. This sensor monitors the temperature of the air going into the motor. The reason for putting it before the IAT sensor is because it will see the cooler temps and the engine will advance timing, allowing for more power. Also placing the injection nozzle as far from the cylinders/air intake sensor as possible, it allows for the water/methanol mixture to be better absorbed into the intake air charge. This allows for great distribution to each cylinder. This post intercooler nozzle location should be the primary nozzle location to be considered for most users.

In theory, since the air charge will be mixed for a longer distance, and therefore time, allowing for the moisture to be absorbed by the air, creating the coolest possible air charge going into the cylinders. Water/methanol molecules from a nozzle located here have more time to be absorbed by the intake charge exiting the IC before making it into the combustion chamber.

4 Pre-Air Intake Temperature Sensor

In the cold side charge pipe is usually an easier or less intrusive nozzle location for most user's than the IC exit tank, but still the closer to IC the better. Locating the nozzle here has same as for reason given in above (location 3)

5 After Air Intake Sensor

After the Air Intake Sensor: You can usually mount it either before or after the ‘butterfly' and still be after the air intake temperature sensor. The main difference when mounting the injector before or after the butterfly is there is less vacuum before versus after the butterfly when idling or driving in vacuum. Translation, when in vacuum, there is more vacuum after the butterfly than before it. Here is why this is important: If your solenoid is placed very far from the injectors (more than a couple of feet), then the vacuum can actually suck just a little bit of the water/methanol. This small amount of moisture ingestion during vacuum is not a problem.

6 Intake manifold

This location can be the most complex area to install. Usually requiring that the intake be removed for access. Injecting here is going to yield the largest water/methanol droplets. And with the closer proximity to the combustion chambers is going to provide a larger amount of mixture into the cylinders. Doing this usually requires more fuel from the factory system be removed. This option is best for max cooling.

The water here is being injected in a manner much like port fuel injection and it is the bigger water molecules being injected here that have a more direct effect of in cylinder cooling and injection here has more of an effect of altering the flame front of the combustion charge in a way much like a higher octane fuel. To take full advantage of this nozzle location it is suggested that trimming away some of the factory dumped fuel be done. In other words, in order to take advantage of the better properties of water over fuel for cooling and injecting water at this location, you want to remove the dumped fuel and actually REPLACE this with water. This injection point with a pretty sophisticated WI control method allows for the most advantageous use of water injection. The drawback for nozzles located heres is kit/component complexity, install complexity, additional labor, possible machine shop costs, and possible additional parts costs.

Jeff, it sounds like your cold start injector is in the same place that my factory Water Injection was.....and in fact the factory Water Injection nozzle looked very similar to the GEN2 cold start injector. I removed the factory Water Injection nozzle and replaced it with the nozzle that came with the Devils Own kit, so I could control the amount fluid I inject. Manny made me a "block of plate" and then tapped the new "block off plate" to accept the Devils Own nozzle.

Her are some pictures for you, to help you understand better.
http://www.6gc.net/forums/index.php?showto...61364&st=80

As for what is better.....I would say buying the fitting that they offer to be installed on a rubber coupler may be better. It allows you to intall the nozzle before the throttle body to help with the atomization process. Obviously the better the atomization, the better the system works, but I haven't experienced any problems. The only problem I can see with installing the fitting in the coupler is that couplers expand under heat, so ithat mayt lead to the fitting having a chance to leak (boost leak). But, if it doesn't, then it may better than installing it where the factory cold start injector is.....Just something to throw at you.

jeff, on jims wrc, it had the factory water injection nozzle in the cold start location, in fact, it uses a injector thats idetical to the 2nd gen cold start.

i just fabbed up a flange, drilled at tapped it for the nozzle, and went to town, works well from what jim and i can tell.

and naa, i wouldnt wanna use it in that rubber coupler...how hard is it to get a replacment for it?....

Exactly brother. What did you use as a gasket for the flange you made?

the stock gasket