Adding jets to reduce IAT temperature?

[boukman]

Hi,

I have Aquamist HFS-3 on my Subaru Impreza EJ207 STI and it works pretty well:

- 2 x 0.7mm pre throttle body (50/50 water/meth)
- FMIC
- GTX3076r @ 20 psi
- ID1000 (~60% IDC)

It's very hot (Weather: 85?F)

I would like to reduce my intake air temperature (actually ~115?F on my IAT sensor that is just before the water jets)

What would be the best solution?

Adding pre compressor nozzle? adding post compressor or something else?

Regards.

[Richard L]

You really need to move the pre throttle jets to the exit of the intercooler. This allows more time for evaporation and reduce charge temperature before arriving the Throttle.

[boukman]

It won't affect detonation protection if I move them at the exit of the intercooler?

Regards.

[Richard L]

it will improve it. You can a more balance cylinder distribution, less likely to starve one cylinder and over-fill the others.

[boukman]

Thank you very much.

I gonna move the jets at the exit of the intercooler.

Can I safely add a little 0.4mm pre compressor too?

Regards.

[Richard L]

We have a few end user using this option but rarely receive a feedback.

I would try the new location jet first.

[parmas]

Thank you very much.

I gonna move the jets at the exit of the intercooler.

Can I safely add a little 0.4mm pre compressor too?

Regards.


When in the past had the front mount intercooler setup, putting the jet just at the exit of the intercooler would be too far. Also the mist needed to climb a 2" pipe height of car -> 90 degree elbow -> throttle body -> intake plenum.


Every setup is different but if you have a picture of your setup we could help you better according piping length and size....

Also 85F or 29DegC is hot but not VERY hot. Here in Malta we see 35C+ in summer and I run no intercooler / only water injection.
Temps are 40DegC / 104F during slow running and sometimes 55DegC/131F when long idle. On boost and water injection I see 30degC / 86F

Also I would position the IAT in the plenum or into throttle body or the nearest possible

[boukman]

Hi,

This is a picture of my setup.

http://img15.hostingpics.net/thumbs/mini_899258AQUA3.jpg (http://www.hostingpics.net/viewer.php?id=899258AQUA3.jpg)

You can see my two jets and IAT sensor position.

2.5" diameter piping

Regards.


When in the past had the front mount intercooler setup, putting the jet just at the exit of the intercooler would be too far. Also the mist needed to climb a 2" pipe height of car -> 90 degree elbow -> throttle body -> intake plenum.


Every setup is different but if you have a picture of your setup we could help you better according piping length and size....

Also 85F or 29DegC is hot but not VERY hot. Here in Malta we see 35C+ in summer and I run no intercooler / only water injection.
Temps are 40DegC / 104F during slow running and sometimes 55DegC/131F when long idle. On boost and water injection I see 30degC / 86F

Also I would position the IAT in the plenum or into throttle body or the nearest possible

[parmas]

Hi,

This is a picture of my setup.

http://img15.hostingpics.net/thumbs/mini_899258AQUA3.jpg (http://www.hostingpics.net/viewer.php?id=899258AQUA3.jpg)

You can see my two jets and IAT sensor position.

2.5" diameter piping

Regards.

The IAT is positioned wrong. If you leave the setup as it is and move the IAT sensor into the plenum, air temp readings will go down drasically.

Could you take a picture from top of the engine showing intercooler output piping length and angles ?

[boukman]

Piping picture:

http://img11.hostingpics.net/thumbs/mini_251069AQUA5.jpg (http://www.hostingpics.net/viewer.php?id=251069AQUA5.jpg)





The IAT is positioned wrong. If you leave the setup as it is and move the IAT sensor into the plenum, air temp readings will go down drasically.

Could you take a picture from top of the engine showing intercooler output piping length and angles ?

[parmas]

Piping picture:

http://img11.hostingpics.net/thumbs/mini_251069AQUA5.jpg (http://www.hostingpics.net/viewer.php?id=251069AQUA5.jpg)

If it was my setup I would put a jet on the first output elbow at the angle, facing the nozzle on a straight line. I would also put one just where the first nozzle is located now and put the IAT sensor into plenum. Check readings and adjust nozzle size accordingly

[Flr Power]

You really need to move the pre throttle jets to the exit of the intercooler. This allows more time for evaporation and reduce charge temperature before arriving the Throttle.

Richard, Would you not get too much wall wetting by having the nozzles so far away leading to small delays before getting the full mist?

[Richard L]

You can look at it another way, wet wall is lined with water. The first re-opening of the throttle, those water is going to be dragged towards the cylinders.

During this transitional period, it is going to cool the charge pipe. Don't forget there are still plenty of air moving to keep the engine running with the throttle shut.

[parmas]

Richard has a point. I experience a wet throttle body due to the post turbo nozzle after a high load run and then idle. The air temps keep going down although not injecting for several minutes and I have NO intercooler!