Water Spray

[Cameron02]

I await the pics with interest

[SuckSqueezeBangBlow]

I have an obd2 gauge which can operate a relay when certain values are met.

E.g boost > x psi AND Inlet air temp > x degrees

Boost > x psi OR throttle position > x %

Heaps of options I guess

[SuckSqueezeBangBlow]

I have a unused adjustable hobbs switch here on the shelf

[Cameron02]

do it

[SuckSqueezeBangBlow]

I was maybe going to pull the intercooler sprayer from the xr6t and fit it to my d-max using the hobbs but now I bought one of these which also has a relay output:

http://www.auberins.com/index.php?main_page=product_info&cPath=5_26&products_id=226

so, if anyone wants to buy the hobbs pressure switch they can have it for $30 posted.

[FPVF6355]

Got the temp controller installed,

Put the probe in the coldside pipe at the exit of the cooler.

NO water spray:

Ambient temp 24deg

Boosting in 1st and second gear, temp spikes from 24deg to 48 degrees

Back off and cruise, temp stays around 35-38 degrees for about a 1km. and slowly comes back to ambient around 10 minutes.

If I boost before 10 minutes, temp spikes higher than 50 degrees, and everything is getting heat soaked.

WITH water spray set to turn on at 29 degrees.:

Boost 1st , 2nd gears. Temp spikes to 38degrees, drops to 25 dgrees in about 30 seconds.

Boost again and temp only hits 38 degrees, and drops back rapidly, heat soak is no issue at all.

PROBLEM:

I was suprised how much heat soak happens after parking.

after my couple of test runs, parked for an hour, then turned on, and temp was 35 degrees. So spray pump came on and stayed on with no purpose, just dumping water.

As soon as I started to move temp dropped, but general heat soak of the complete air intake system was hard to get temp below 28 degrees. After a few km of normal driving (not boosting) temp came down to 21 degrees.

I think if the thermo fans came on for a few minutes on engine start, that would get the heat soaked air intake system down in temp quicker.?????????????????

[Cameron02]

Awesome, sounds like you are getting great results 10+ degrees cooler. Anybody know what 10 degrees works out to be in RWKW on a standard motor?

Yes, this is my first turbo car and I am amazed how hot the under bonnet temps are even an hour after parking the car. The rocker cover could burn my hand. I am planning on putting some louver in my bonnet to reduce this effect. Still in design phase at the moment (although I have purchased a used bonnet for the project).

Re: "after parking" You may want to install a switch to turn the system off so that you avoid water dumping. Otherwise being stuck in heavy traffic might also become an issue.

[FPVF6355]

PROBLEM:

I was suprised how much heat soak happens after parking.

after my couple of test runs, parked for an hour, then turned on, and temp was 35 degrees. So spray pump came on and stayed on with no purpose, just dumping water.

As soon as I started to move temp dropped, but general heat soak of the complete air intake system was hard to get temp below 28 degrees. After a few km of normal driving (not boosting) temp came down to 21 degrees.

I ended up buying a micro switch (has a long lever on it)

It is attached to the side of the throttle pedal bracket.

When I hit about 1/3 throttle, the switch allows the temp controller to operate the pump.

Works perfectly

So what I learnt is the best setting is ambient temp. If it's 35 outside, set the temp controller to 35.

If the temp of the cooler is over 35, and give it some gas, pump comes on unitl you back off the throttle.

Temp then drops about 5 degrees below ambient (30) and fluctuates from 30 - 38 as you launch off at every set of lights, using minimal water.

Turned the controller "off" which turns off everything, and turned back on about 10 min later, temp on same type of driving was reading 48 degrees, oil pressure was way down, engine temp was way up.

so water spray is 100% worth it, water cooling the air intake cools everything better.

In winter it would hardly be worth it, getting below 21 degrees, seems impossible even when ambient is 12 degrees. So definately going to make driving around in summer more fun than it has been

I think a vented bonnet would do wonders in helping keep the engine bay cooler, I saw a fibreglass one on Bluepowers yellow car (BF) looked pretty tough, and good fit.

Not sure where he got it.

[Cameron02]

That's a clever setup. Combining the temp controller and throttle switch. Great results

[FPVF6355]

That's a clever setup. Combining the temp controller and throttle switch. Great results

Thanks, it would be better if I knew how to tap into the TPS on the car and use that to operate a relay, intead of a seperate switch.

Anyone know if that's possible ??