rgv_stu

im gonna make my own intercooler water spray as a little project.

a few questions to anyone whos made one themself

question 1 is how long should it keep spraying after activating (just gonna activate via a push switch in the dash)

question 2 what is a good jet / jets to use for the spray itself ?

question 3 i presume a water washer pump is man enough for the job ??

dr_jones

iTrader: (1)

1. It shouldn't drop out between gearchanges when accelerating.
2. Sti items fit in with just two holes to be dtilled / filed + very good spray pattern for TMIC.
3. Yes should provide plenty of flow - VDO do a pretty decent item.

rgv_stu

thanks
so a spray of like 10-15 seconds should suffice then ??

the sti jets - where do i find these and how much do they cost ??
cheers

Dark Blue Mark

There was a good thread on this a year or so ago, maybe in projects?

MB

vulnax999

iTrader: (7)

Curious, what sort of activation are you using, just a manual push to spray switch, or something that comes on at a set boost ( and maybe for 5 seconds plus after? )

I Had an eLabtronics unit which worked on air temp differences in normal air and intercooler outlet air temp, and injector duty cycle, but was too fiddly to set up so looking at a simple pressure switch to turn the pump on when I hit say 14 psi.

Not sure if it sprays for a while after though... ( Aquamist switch was mentioned ).

vulnax999

iTrader: (7)

PS - the Hozelock ( spelling? ) garden sprayer jets at about £1 each from B&Q do a pretty good job too!

rgv_stu

was just gonna use a motorola 1455 ic in monostable mode, a push switch to activate and it will hold on the o/p (relay in my case) for a period of time. that time is set by a cap and a resistor. you could make the trigger a boost activated switch or whatever you fancy really.

vulnax999

iTrader: (7)

Lost me! Too techy, but maybe I can get my E/I guys at work to knock me one up!!!

Unless when you make yours you make me one too and sell me one ( cheap tho! )

rgv_stu

lol
erm very simple circuit
with only a handfull of components
search google for a 555 timer circuit
tis exactly the same thing

rgv_stu

see this page
http://www.doctronics.co.uk/555.htm
scroll down to monostable circuit
thats what you need, just stick the o/p to a relay and diode (for protection)
that relay will then drive a seperate pump for whatever timing interval you have specified.

dazc

I made one for my FMIC by re-routing the headlamp washer jet feed to behind the front bumper, and taking it into a hard plastic pipe (1cm diameter air bubble thingy for a fish tank). This has holes all down the length of it to let air out normally, but in this case water from the washer resovoir.

I usually only use it in Summer (hence no/t much screenwash) but it floods the intercooler much better than some of the OE systems do and works a treat, (just ensure you keep the non-return valve).

Hold steady throttle, hit the headlamp washer button which gives about a 5 sec burst and the revs really do pick up. No wiring, hidden behind the grill. Works for me, I just have to wipe headlamps in Winter.

Now if only I could find a better use for that "BRIGHT" button.... Daz

vulnax999

iTrader: (7)

Hmm read that, dont ( fully) understand it but I see what you mean. But I still need a presssure switch / transducer to act as a tigger then ....

vulnax999

iTrader: (7)

Why not install NOS and use the bright button to turn it on and "light" up your tyres as you go silly speeds!

dazc

Now that's an answer ! Daz

rgv_stu

vulnax , yes you need some sort of trigger wether it be a simple push switch or a pressure switch. or both.

dazc

The headlamp washer button is the switch. Already wired in for you. Instead of the water washing your headlamps, it squirts your intercooler. It took me about 15 mins and is completely reversable anytime.

vulnax999

iTrader: (7)

Sorry Dazc, wasn't your post I was lost on!!

Welloilbeefhooked

iTrader: (3)

Now then!

Just in the process of rigging up my own setup.

I have tapped the side of the rear of the IC and screwed in a pressure switch that I got from RS for about £15. Its adjustable from 0-1bar.

I'm using it to trigger a 555 timer circuit which in turn triggers a relay for a preset time.

The nozzles are the gen STI parts from www.scoobymania.co.uk £20 I think.

The bottle is a 10L camping bottle that cost £4 from CCC in Sheffield with a washer motor from Halfords £12.

And it will eventually be spraying on my new STI 8 IC!!


What size of pipe does everyone use for the water?

Welloilbeefhooked

iTrader: (3)

http://www.maplin.co.uk/Module.aspx?...rldID=&doy=9m2

http://www.maplin.co.uk/Module.aspx?...dID=10&doy=9m2


Timer circuit

vulnax999

iTrader: (7)

Kool!!!

Now find me a 1 - 2 bar adjustable pressure switch!!!

Peanuts

iTrader: (15)

Im after using a sprung toggle, that way I have control on the duration

if your that way inclined you could rig it up to work on a combination of say +0.75 bar boost and 100% throttle position couldnt you?
(ie when gunning it)

Welloilbeefhooked

iTrader: (3)

Pressure switch from www.rswww.com

http://rswww.com/cgi-bin/bv/browse/M...cknum=297-0052

I think its about £22 ish. Still its cheaper than aquamist!!


And this one too, which is the one I use.

http://rswww.com/cgi-bin/bv/browse/M...cknum=398-7045

Welloilbeefhooked

iTrader: (3)

Peanuts,

This is how mine will work.

When 1bar boost is reached the pressure switch will trigger the timer circuit. This timer will switch the relay on for 3-5 seconds spraying water onto the IC.
When I change gear, hopefully faster than 3-5 seconds, the system will still spray and will probably not stop at all during a spirited drive. Only when I have been off boost, below 1bar, for over 5 seconds will it stop. I will also have a dash mounted switch to arm/disarm the system.

Hope this helps.

Forgot to say that full throttle may limit the use of the spray too much. Either boost level switching or temp switching seem the best ways to go.

Are you really wanting to mess with switches when driving hard?

messiah

Have a look on ebay for kits - there's a company that makes them starting at about £30 depending on number of sprays etc.

http://www.canward.co.uk/

Gus (Gussy?) just fitted one one of the £50 kits - said installation was easy and works like a dream.

Mark A

iTrader: (1)

And they are for sale in the clearance section!

gussy

iTrader: (2)

As messiah says I fitted one to my car a couple off weeks ago cost £50 works spot on 3 fogger nozzles/pipework/switch and a 10second timer I think they have a clearance line on at the moment

Welloilbeefhooked

iTrader: (3)

Just found a better/more suitable timer

www.cpc.co.uk

part number HK00263 In Stock 11.53 1S TO 3MIN TIMER

It has a relay with a load rating of 5 amps but I think another relay should be used to switch the pump on.

messiah

Quite tempted by one of the kits now - although might have to see about a proper water spray switch from Grade A...

wah

Have a word with j4mou about the kits he got one and wast not impressed with it

PICKLE

http://www.maplin.co.uk/Module.aspx?...rldID=&doy=9m2

I have purchased the above timer, and made the circuit up.
I am abit uncertain about where to put it in the circuit though??

Does the timer need to go between the Pressure Switch and the Motor,

OR

between the Switch in dash and the Pressure Switch??

I'm going to be fitting this too a car tomorrow, that does not have the Headlight Washer accessory on it, so that is the reason for fitting a 'Timer' switch inline of the circuit.!

Thanks